compat/openssl*
compat/tcl*


fossil
fossil.exe
win/fossil.exe
*shell-see.*
*sqlite3-see.*

# See www/containers.md for documentation on how to use this file.

## ---------------------------------------------------------------------
## STAGE 1: Build static Fossil & BusyBox binaries atop Alpine Linux
## ---------------------------------------------------------------------






FROM alpine:latest AS builder
WORKDIR /tmp

### Bake the basic Alpine Linux into a base layer so we never have to
### repeat that step unless we change the package set.  Although we're
### going to throw this layer away below, we still pass --no-cache
### because that cache is of no use in an immutable layer.  Note that
### we allow the UPX step to fail: it isn't in the ARM distros.  We'll
### check whether this optional piece exists before using it below.
RUN set -x                                                             \
    && apk update                                                      \
    && apk upgrade --no-cache                                          \
    && apk add --no-cache                                              \
         gcc make moreutils                                            \
         linux-headers musl-dev                                        \
         openssl-dev openssl-libs-static                               \
         zlib-dev zlib-static                                          \
     ; apk add --no-cache upx

### Bake the custom BusyBox into another layer.  The intent is that this
### changes only when we change BBXVER.  That will force an update of
### the layers below, but this is a rare occurrence.
ARG BBXVER="1_35_0"
ENV BBXURL "https://github.com/mirror/busybox/tarball/${BBXVER}"
COPY containers/busybox-config /tmp/bbx/.config
ADD $BBXURL /tmp/bbx/src.tar.gz
RUN set -x \
    && tar --strip-components=1 -C bbx -xzf bbx/src.tar.gz            \
    && ( cd bbx && yes "" | make oldconfig && make -j11 )             \
    && if [ -x /usr/bin/upx ] ; then upx -9q bbx/busybox ; fi

### The changeable Fossil layer is the only one in the first stage that
### changes often, so add it last, to make it independent of the others.

###
### $FSLSTB can be either a file or a directory due to a ADD's bizarre
### behavior: it unpacks tarballs when added from a local file but not

### from a URL!   It matters because we default to a URL in case you're
### building outside a Fossil checkout, but when building via the
### container-image target, we can avoid a costly hit on the Fossil
### project's home site by pulling the data from the local repo via the
### "tarball" command.  This is a DVCS, after all!


ARG FSLVER="trunk"
ARG FSLURL="https://fossil-scm.org/home/tarball/src?r=${FSLVER}"
ENV FSLSTB=/tmp/fsl/src.tar.gz
ADD $FSLURL $FSLSTB
RUN set -x \
    && if [ -d $FSLSTB ] ; then mv $FSLSTB/src fsl ;                  \

       else tar -C fsl -xzf fsl/src.tar.gz ; fi                       \
    && m=fsl/src/src/main.mk                                          \
    && grep -v '/skins/[a-ce-z]' $m | sponge $m                       \
    && fsl/src/configure --static CFLAGS='-Os -s' && make -j11        \
    && if [ -x /usr/bin/upx ] ; then upx -9q fossil ; fi


## ---------------------------------------------------------------------
## STAGE 2: Pare that back to the bare essentials.
## ---------------------------------------------------------------------

FROM scratch
WORKDIR /jail
ARG UID=499
ENV PATH "/bin:/jail/bin"

### Lay BusyBox down as the first base layer. Coupled with the host's
### kernel, this is the "OS."
COPY --from=builder /tmp/bbx/busybox /bin/
RUN [ "/bin/busybox", "--install", "/bin" ]

### Set up that base OS for our specific use without tying it to
### anything likely to change often.  So long as the user leaves
### UID alone, this layer will be durable.
RUN set -x                                                             \

    && echo 'root:x:0:0:SysAdmin:/:/bin/nologin' > /etc/passwd         \
    && echo 'root:x:0:root'                      > /etc/group          \
    && addgroup -S -g ${UID} fossil                                    \
    && adduser -S -h `pwd` -g 'Fossil User' -G fossil -u ${UID} fossil \
    && install -d -m 700 -o fossil -g fossil log museum                \
    && install -d -m 755 -o fossil -g fossil dev                       \
    && mknod -m 666 dev/null    c 1 3                                  \
    && mknod -m 444 dev/urandom c 1 9



### Do Fossil-specific things atop those base layers; this will change

### as often as the Fossil build-from-source layer above.
COPY --from=builder /tmp/fossil bin/
RUN set -x                                                             \
    && ln -s /jail/bin/fossil /bin/f                                   \
    && echo -e '#!/bin/sh\nfossil sha1sum "$@"' > /bin/sha1sum         \
    && echo -e '#!/bin/sh\nfossil sha3sum "$@"' > /bin/sha3sum         \
    && echo -e '#!/bin/sh\nfossil sqlite3 --no-repository "$@"' >      \
       /bin/sqlite3                                                    \
    && chmod +x /bin/sha?sum /bin/sqlite3


## ---------------------------------------------------------------------
## STAGE 3: Run!
## ---------------------------------------------------------------------


EXPOSE 8080/tcp
CMD [ \
    "bin/fossil", "server", \
    "--chroot", "/jail",    \
    "--create",             \
    "--jsmode", "bundled",  \
    "--user", "admin",      \
    "museum/repo.fossil"]

#!/usr/bin/make
#
# This is the top-level makefile for Fossil when the build is occurring
# on a unix platform.  This works out-of-the-box on most unix platforms.
# But you are free to vary some of the definitions if desired.
#
#### The toplevel directory of the source tree.  Fossil can be built
#    in a directory that is separate from the source tree.  Just change
#    the following to point from the build directory to the src/ folder.
#
SRCDIR = @srcdir@/src

#### Upstream source files included directly in this repository.
#
SRCDIR_extsrc = @srcdir@/extsrc
#### In-tree tools such as code generators and translators:
#
SRCDIR_tools = @srcdir@/tools

#
TCLSH = @TCLSH@

CFLAGS = @CFLAGS@
CFLAGS_INCLUDE = @CFLAGS_INCLUDE@
LIB =	@LDFLAGS@ @EXTRA_LDFLAGS@ @LIBS@
BCCFLAGS =	@CPPFLAGS@ $(CFLAGS)
TCCFLAGS =	@EXTRA_CFLAGS@ @CPPFLAGS@ $(CFLAGS) -DHAVE_AUTOCONFIG_H -D_HAVE_SQLITE_CONFIG_H
#
# Fuzzing may be enable by appending -fsanitize=fuzzer -DFOSSIL_FUZZ
# to the TCCFLAGS variable.
# For more thorouth (but also slower) investigation
#      -fsanitize=fuzzer,undefined,address
# might be more useful.

# with the Emscripten SDK package:
# https://emscripten.org/docs/getting_started/downloads.html
EMSDK_HOME = @EMSDK_HOME@
EMSDK_ENV = @EMSDK_ENV@
EMCC_OPT = @EMCC_OPT@
EMCC_WRAPPER = $(SRCDIR_tools)/emcc.sh





.PHONY: all tags

include $(SRCDIR)/main.mk

distclean: clean
	-rm -f autoconfig.h config.log Makefile
	-rm -f cscope.out tags

# around interfering makes this failure mode even worse.
Makefile: @srcdir@/Makefile.in $(SRCDIR)/main.mk @AUTODEPS@
	@AUTOREMAKE@
	touch @builddir@/Makefile

# Container stuff
SRCTB := src-@FOSSIL_CI_PFX@.tar.gz


























container-image:
	$(APPNAME) tarball --name src @FOSSIL_CI_PFX@ $(SRCTB)
	docker build \

		--tag fossil:@FOSSIL_CI_PFX@ \
		--build-arg FSLURL=$(SRCTB) \
		$(DBFLAGS) @srcdir@
	rm -f $(SRCTB)

container-run: container-image


	docker run \
		--name fossil-@FOSSIL_CI_PFX@ \
		--cap-drop AUDIT_WRITE \
		--cap-drop CHOWN \
		--cap-drop FSETID \
		--cap-drop KILL \
		--cap-drop MKNOD \
		--cap-drop NET_BIND_SERVICE \
		--cap-drop NET_RAW \
		--cap-drop SETFCAP \
		--cap-drop SETPCAP \
		--detach --publish 8080:8080 \
		$(DRFLAGS) fossil:@FOSSIL_CI_PFX@
	docker container logs fossil-@FOSSIL_CI_PFX@

2.20

    internal-sqlite=1    => {Don't use the internal SQLite, use the system one}
    static=0             => {Link a static executable}
    fusefs=1             => {Disable the Fuse Filesystem}
    fossil-debug=0       => {Build with fossil debugging enabled}
    no-opt=0             => {Build without optimization}
    json=0               => {Build with fossil JSON API enabled}
    with-emsdk:path      => {Directory containing the Emscripten SDK}


}

# Update the minimum required SQLite version number here, and also
# in src/main.c near the sqlite3_libversion_number() call.  Take care
# that both places agree!
define MINIMUM_SQLITE_VERSION "3.38.0"

# This is useful for people wanting Fossil to use an external SQLite library
# to compare the one they have against the minimum required
if {[opt-bool print-minimum-sqlite-version]} {
    puts [get-define MINIMUM_SQLITE_VERSION]
    exit 0
}







# sqlite wants these types if possible
cc-with {-includes {stdint.h inttypes.h}} {
    cc-check-types uint32_t uint16_t int16_t uint8_t
}

# Use pread/pwrite system calls in place of seek + read/write if possible

    }
    user-error "system sqlite3 not found"
  }

  find_system_sqlite

  proc test_system_sqlite {} {
    # Check compatibility of the system SQLite library by running the sqlcompttest.c
    # program in the source tree
    # passes MINIMUM_SQLITE_VERSION set at the top of this file to sqlcompttest.c

    #
    set cmdline {}
    lappend cmdline {*}[get-define CCACHE]
    lappend cmdline {*}[get-define CC] {*}[get-define CFLAGS]
    lappend cmdline $::autosetup(dir)/../tools/sqlcompattest.c -o conftest__
    lappend cmdline {*}[get-define LDFLAGS]
    lappend cmdline {*}[get-define LIBS]

  }
  cc-with [list -cflags "-I$zlibdir -L$zlibdir"]
  define-append EXTRA_CFLAGS -I$zlibdir
  define-append LIBS $zlibdir/libz.a
  set ::zlib_lib $zlibdir/libz.a
  msg-result "Using zlib in source tree"
} else {


  if {$zlibpath ni {auto ""}} {









    cc-with [list -cflags "-I$zlibpath -L$zlibpath"]



    define-append EXTRA_CFLAGS -I$zlibpath














    define-append EXTRA_LDFLAGS -L$zlibpath
    msg-result "Using zlib from $zlibpath"
  }
  if {![cc-check-includes zlib.h] || ![check-function-in-lib inflateEnd z]} {
    user-error "zlib not found please install it or specify the location with --with-zlib"


  }
  set ::zlib_lib -lz
}

set ssldirs [opt-val with-openssl]
if {$ssldirs ne "none"} {
    set found 0

            }
        }
    }
    if {$found} {
        define FOSSIL_ENABLE_SSL
        define-append EXTRA_CFLAGS $cflags
        define-append EXTRA_LDFLAGS $ldflags


        if {[info exists ssllibs]} {
            define-append LIBS $ssllibs
        } else {
            define-append LIBS -lssl -lcrypto
        }
        if {[info exists ::zlib_lib]} {
            define-append LIBS $::zlib_lib

    }
    set version $tclconfig(TCL_VERSION)$tclconfig(TCL_PATCH_LEVEL)
    msg-result "Found Tcl $version at $tclconfig(TCL_PREFIX)"
    if {!$tclprivatestubs} {
        define-append LIBS $libs
    }
    define-append EXTRA_CFLAGS $cflags

    if {[info exists zlibpath] && $zlibpath eq "tree"} {
      #
      # NOTE: When using zlib in the source tree, prevent Tcl from
      #       pulling in the system one.
      #
      set tclconfig(TCL_LD_FLAGS) [string map [list -lz ""] \
          $tclconfig(TCL_LD_FLAGS)]

  } elseif {[cc-check-function-in-lib fuse_mount fuse]} {
     define-append EXTRA_CFLAGS -DFOSSIL_HAVE_FUSEFS
     define FOSSIL_HAVE_FUSEFS 1
     define-append LIBS -lfuse
     msg-result "FuseFS support enabled"
  }
}


































# Add -fsanitize compile and link options late: we don't want the C
# checks above to run with those sanitizers enabled.  It can not only
# be pointless, it can actually break correct tests.
set fsan [opt-val with-sanitizer]
if {[string length $fsan]} {
    define-append  EXTRA_CFLAGS -fsanitize=$fsan

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

cmake_minimum_required(VERSION 2.4.4)
set(CMAKE_ALLOW_LOOSE_LOOP_CONSTRUCTS ON)

project(zlib C)

set(VERSION "1.2.12")

option(ASM686 "Enable building i686 assembly implementation")
option(AMD64 "Enable building amd64 assembly implementation")

set(INSTALL_BIN_DIR "${CMAKE_INSTALL_PREFIX}/bin" CACHE PATH "Installation directory for executables")
set(INSTALL_LIB_DIR "${CMAKE_INSTALL_PREFIX}/lib" CACHE PATH "Installation directory for libraries")
set(INSTALL_INC_DIR "${CMAKE_INSTALL_PREFIX}/include" CACHE PATH "Installation directory for headers")
set(INSTALL_MAN_DIR "${CMAKE_INSTALL_PREFIX}/share/man" CACHE PATH "Installation directory for manual pages")
set(INSTALL_PKGCONFIG_DIR "${CMAKE_INSTALL_PREFIX}/share/pkgconfig" CACHE PATH "Installation directory for pkgconfig (.pc) files")

if(NOT MINGW)
    set(ZLIB_DLL_SRCS
        win32/zlib1.rc # If present will override custom build rule below.
    )
endif()

if(CMAKE_COMPILER_IS_GNUCC)
    if(ASM686)
        set(ZLIB_ASMS contrib/asm686/match.S)
    elseif (AMD64)
        set(ZLIB_ASMS contrib/amd64/amd64-match.S)
    endif ()

	if(ZLIB_ASMS)
		add_definitions(-DASMV)
		set_source_files_properties(${ZLIB_ASMS} PROPERTIES LANGUAGE C COMPILE_FLAGS -DNO_UNDERLINE)
	endif()
endif()

if(MSVC)
    if(ASM686)
		ENABLE_LANGUAGE(ASM_MASM)
        set(ZLIB_ASMS
			contrib/masmx86/inffas32.asm
			contrib/masmx86/match686.asm
		)
    elseif (AMD64)
		ENABLE_LANGUAGE(ASM_MASM)
        set(ZLIB_ASMS
			contrib/masmx64/gvmat64.asm
			contrib/masmx64/inffasx64.asm
		)
    endif()

	if(ZLIB_ASMS)
		add_definitions(-DASMV -DASMINF)
	endif()
endif()

# parse the full version number from zlib.h and include in ZLIB_FULL_VERSION
file(READ ${CMAKE_CURRENT_SOURCE_DIR}/zlib.h _zlib_h_contents)
string(REGEX REPLACE ".*#define[ \t]+ZLIB_VERSION[ \t]+\"([-0-9A-Za-z.]+)\".*"
    "\\1" ZLIB_FULL_VERSION ${_zlib_h_contents})

if(MINGW)
    # This gets us DLL resource information when compiling on MinGW.

                            -I ${CMAKE_CURRENT_SOURCE_DIR}
                            -I ${CMAKE_CURRENT_BINARY_DIR}
                            -o ${CMAKE_CURRENT_BINARY_DIR}/zlib1rc.obj
                            -i ${CMAKE_CURRENT_SOURCE_DIR}/win32/zlib1.rc)
    set(ZLIB_DLL_SRCS ${CMAKE_CURRENT_BINARY_DIR}/zlib1rc.obj)
endif(MINGW)

add_library(zlib SHARED ${ZLIB_SRCS} ${ZLIB_ASMS} ${ZLIB_DLL_SRCS} ${ZLIB_PUBLIC_HDRS} ${ZLIB_PRIVATE_HDRS})
add_library(zlibstatic STATIC ${ZLIB_SRCS} ${ZLIB_ASMS} ${ZLIB_PUBLIC_HDRS} ${ZLIB_PRIVATE_HDRS})
set_target_properties(zlib PROPERTIES DEFINE_SYMBOL ZLIB_DLL)
set_target_properties(zlib PROPERTIES SOVERSION 1)

if(NOT CYGWIN)
    # This property causes shared libraries on Linux to have the full version
    # encoded into their final filename.  We disable this on Cygwin because
    # it causes cygz-${ZLIB_FULL_VERSION}.dll to be created when cygz.dll

                ChangeLog file for zlib































Changes in 1.2.12 (27 Mar 2022)
- Cygwin does not have _wopen(), so do not create gzopen_w() there
- Permit a deflateParams() parameter change as soon as possible
- Limit hash table inserts after switch from stored deflate
- Fix bug when window full in deflate_stored()
- Fix CLEAR_HASH macro to be usable as a single statement
- Avoid a conversion error in gzseek when off_t type too small

- Add contrib/vstudio/vc10 pre-build step for static only
- Quote --version-script argument in CMakeLists.txt
- Don't specify --version-script on Apple platforms in CMakeLists.txt
- Fix casting error in contrib/testzlib/testzlib.c
- Fix types in contrib/minizip to match result of get_crc_table()
- Simplify contrib/vstudio/vc10 with 'd' suffix
- Add TOP support to win32/Makefile.msc
- Suport i686 and amd64 assembler builds in CMakeLists.txt
- Fix typos in the use of _LARGEFILE64_SOURCE in zconf.h
- Add vc11 and vc12 build files to contrib/vstudio
- Add gzvprintf() as an undocumented function in zlib
- Fix configure for Sun shell
- Remove runtime check in configure for four-byte integer type
- Add casts and consts to ease user conversion to C++
- Add man pages for minizip and miniunzip

- Avoid deflate sensitivity to volatile input data
- Avoid division in adler32_combine for NO_DIVIDE
- Clarify the use of Z_FINISH with deflateBound() amount of space
- Set binary for output file in puff.c
- Use u4 type for crc_table to avoid conversion warnings
- Apply casts in zlib.h to avoid conversion warnings
- Add OF to prototypes for adler32_combine_ and crc32_combine_ [Miller]
- Improve inflateSync() documentation to note indeterminancy
- Add deflatePending() function to return the amount of pending output
- Correct the spelling of "specification" in FAQ [Randers-Pehrson]
- Add a check in configure for stdarg.h, use for gzprintf()
- Check that pointers fit in ints when gzprint() compiled old style
- Add dummy name before $(SHAREDLIBV) in Makefile [Bar-Lev, Bowler]
- Delete line in configure that adds -L. libz.a to LDFLAGS [Weigelt]
- Add debug records in assmebler code [Londer]
- Update RFC references to use http://tools.ietf.org/html/... [Li]
- Add --archs option, use of libtool to configure for Mac OS X [Borstel]

Changes in 1.2.5 (19 Apr 2010)
- Disable visibility attribute in win32/Makefile.gcc [Bar-Lev]
- Default to libdir as sharedlibdir in configure [Nieder]
- Update copyright dates on modified source files

- Clean up what gets compiled for FASTEST
- Incorporate changes to zconf.in.h [Vollant]
    - Refine detection of Turbo C need for dummy returns
    - Refine ZLIB_DLL compilation
    - Include additional header file on VMS for off_t typedef
- Try to use _vsnprintf where it supplants vsprintf [Vollant]
- Add some casts in inffast.c
- Enchance comments in zlib.h on what happens if gzprintf() tries to
  write more than 4095 bytes before compression
- Remove unused state from inflateBackEnd()
- Remove exit(0) from minigzip.c, example.c
- Get rid of all those darn tabs
- Add "check" target to Makefile.in that does the same thing as "test"
- Add "mostlyclean" and "maintainer-clean" targets to Makefile.in
- Update contrib/inflate86 [Anderson]

 . ZALLOC the length list in inflate_trees_fixed() instead of using stack
 . ZALLOC the value area for huft_build() instead of using stack
 . Simplify Z_FINISH check in inflate()

- Avoid gcc 2.8.0 comparison bug a little differently than zlib 1.0.8
- in inftrees.c, avoid cc -O bug on HP (Farshid Elahi)
- in zconf.h move the ZLIB_DLL stuff earlier to avoid problems with
  the declaration of FAR (Gilles VOllant)
- install libz.so* with mode 755 (executable) instead of 644 (Marc Lehmann)
- read_buf buf parameter of type Bytef* instead of charf*
- zmemcpy parameters are of type Bytef*, not charf* (Joseph Strout)
- do not redeclare unlink in minigzip.c for WIN32 (John Bowler)
- fix check for presence of directories in "make install" (Ian Willis)

Changes in 1.0.8 (27 Jan 1998)

- clear z->msg in inflateInit2 before any error return
- initialize opaque in example.c, gzio.c, deflate.c and inflate.c
- fixed typo in zconf.h (_GNUC__ => __GNUC__)
- check for WIN32 in zconf.h and zutil.c (avoid farmalloc in 32-bit mode)
- fix typo in Make_vms.com (f$trnlnm -> f$getsyi)
- in fcalloc, normalize pointer if size > 65520 bytes
- don't use special fcalloc for 32 bit Borland C++
- use STDC instead of __GO32__ to avoid redeclaring exit, calloc, etc...
- use Z_BINARY instead of BINARY
- document that gzclose after gzdopen will close the file
- allow "a" as mode in gzopen
- fix error checking in gzread
- allow skipping .gz extra-field on pipes
- added reference to Perl interface in README
- put the crc table in FAR data (I dislike more and more the medium model :)

- avoid "zip" everywhere, use zlib instead of ziplib
- suppress Z_BLOCK_FLUSH, interpret Z_PARTIAL_FLUSH as block flush
  if compression method == 8
- added adler32 and crc32
- renamed deflateOptions as deflateInit2, call one or the other but not both
- added the method parameter for deflateInit2
- added inflateInit2
- simplied considerably deflateInit and inflateInit by not supporting
  user-provided history buffer. This is supported only in deflateInit2
  and inflateInit2

Changes in 0.3:
- prefix all macro names with Z_
- use Z_FINISH instead of deflateEnd to finish compression
- added Z_HUFFMAN_ONLY
- added gzerror()

                Frequently Asked Questions about zlib


If your question is not there, please check the zlib home page
http://zlib.net/ which may have more recent information.
The lastest zlib FAQ is at http://zlib.net/zlib_faq.html


 1. Is zlib Y2K-compliant?

    Yes. zlib doesn't handle dates.

 2. Where can I get a Windows DLL version?

# Makefile for zlib
# Copyright (C) 1995-2017 Jean-loup Gailly, Mark Adler
# For conditions of distribution and use, see copyright notice in zlib.h

# To compile and test, type:
#    ./configure; make test
# Normally configure builds both a static and a shared library.
# If you want to build just a static library, use: ./configure --static

# To use the asm code, type:
#    cp contrib/asm?86/match.S ./match.S
#    make LOC=-DASMV OBJA=match.o

# To install /usr/local/lib/libz.* and /usr/local/include/zlib.h, type:
#    make install
# To install in $HOME instead of /usr/local, use:
#    make install prefix=$HOME

CC=gcc

CFLAGS=-O3 -D_LARGEFILE64_SOURCE=1 -DHAVE_HIDDEN
#CFLAGS=-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7
#CFLAGS=-g -DZLIB_DEBUG
#CFLAGS=-O3 -Wall -Wwrite-strings -Wpointer-arith -Wconversion \
#           -Wstrict-prototypes -Wmissing-prototypes

SFLAGS=-O3 -fPIC -D_LARGEFILE64_SOURCE=1 -DHAVE_HIDDEN
LDFLAGS=
TEST_LDFLAGS=-L. libz.a
LDSHARED=gcc
CPP=gcc -E

STATICLIB=libz.a
SHAREDLIB=
SHAREDLIBV=
SHAREDLIBM=
LIBS=$(STATICLIB) $(SHAREDLIBV)

AR=ar
ARFLAGS=rc
RANLIB=ranlib
LDCONFIG=ldconfig
LDSHAREDLIBC=-lc
TAR=tar
SHELL=/bin/sh
EXE=

prefix =/usr/local
exec_prefix =${prefix}
libdir =${exec_prefix}/lib
sharedlibdir =${libdir}
includedir =${prefix}/include
mandir =${prefix}/share/man
man3dir = ${mandir}/man3
pkgconfigdir = ${libdir}/pkgconfig
SRCDIR=
ZINC=
ZINCOUT=-I.

OBJZ = adler32.o crc32.o deflate.o infback.o inffast.o inflate.o inftrees.o trees.o zutil.o
OBJG = compress.o uncompr.o gzclose.o gzlib.o gzread.o gzwrite.o
OBJC = $(OBJZ) $(OBJG)

PIC_OBJZ = adler32.lo crc32.lo deflate.lo infback.lo inffast.lo inflate.lo inftrees.lo trees.lo zutil.lo
PIC_OBJG = compress.lo uncompr.lo gzclose.lo gzlib.lo gzread.lo gzwrite.lo
PIC_OBJC = $(PIC_OBJZ) $(PIC_OBJG)

# to use the asm code: make OBJA=match.o, PIC_OBJA=match.lo
OBJA =
PIC_OBJA =

OBJS = $(OBJC) $(OBJA)

PIC_OBJS = $(PIC_OBJC) $(PIC_OBJA)

all: static all64

static: example$(EXE) minigzip$(EXE)

shared: examplesh$(EXE) minigzipsh$(EXE)

all64: example64$(EXE) minigzip64$(EXE)

check: test

test: all teststatic test64

teststatic: static
	@TMPST=tmpst_$$; \
	if echo hello world | ./minigzip | ./minigzip -d && ./example $$TMPST ; then \
	  echo '		*** zlib test OK ***'; \
	else \
	  echo '		*** zlib test FAILED ***'; false; \
	fi
	@rm -f tmpst_$$

testshared: shared
	@LD_LIBRARY_PATH=`pwd`:$(LD_LIBRARY_PATH) ; export LD_LIBRARY_PATH; \
	LD_LIBRARYN32_PATH=`pwd`:$(LD_LIBRARYN32_PATH) ; export LD_LIBRARYN32_PATH; \
	DYLD_LIBRARY_PATH=`pwd`:$(DYLD_LIBRARY_PATH) ; export DYLD_LIBRARY_PATH; \
	SHLIB_PATH=`pwd`:$(SHLIB_PATH) ; export SHLIB_PATH; \
	TMPSH=tmpsh_$$; \
	if echo hello world | ./minigzipsh | ./minigzipsh -d && ./examplesh $$TMPSH; then \
	  echo '		*** zlib shared test OK ***'; \
	else \
	  echo '		*** zlib shared test FAILED ***'; false; \
	fi
	@rm -f tmpsh_$$

test64: all64
	@TMP64=tmp64_$$; \
	if echo hello world | ./minigzip64 | ./minigzip64 -d && ./example64 $$TMP64; then \
	  echo '		*** zlib 64-bit test OK ***'; \
	else \
	  echo '		*** zlib 64-bit test FAILED ***'; false; \
	fi
	@rm -f tmp64_$$

infcover.o: $(SRCDIR)test/infcover.c $(SRCDIR)zlib.h zconf.h
	$(CC) $(CFLAGS) $(ZINCOUT) -c -o $@ $(SRCDIR)test/infcover.c

infcover: infcover.o libz.a
	$(CC) $(CFLAGS) -o $@ infcover.o libz.a

cover: infcover
	rm -f *.gcda
	./infcover
	gcov inf*.c

libz.a: $(OBJS)
	$(AR) $(ARFLAGS) $@ $(OBJS)
	-@ ($(RANLIB) $@ || true) >/dev/null 2>&1

match.o: match.S
	$(CPP) match.S > _match.s
	$(CC) -c _match.s
	mv _match.o match.o
	rm -f _match.s

match.lo: match.S
	$(CPP) match.S > _match.s
	$(CC) -c -fPIC _match.s
	mv _match.o match.lo
	rm -f _match.s

example.o: $(SRCDIR)test/example.c $(SRCDIR)zlib.h zconf.h
	$(CC) $(CFLAGS) $(ZINCOUT) -c -o $@ $(SRCDIR)test/example.c

minigzip.o: $(SRCDIR)test/minigzip.c $(SRCDIR)zlib.h zconf.h
	$(CC) $(CFLAGS) $(ZINCOUT) -c -o $@ $(SRCDIR)test/minigzip.c

example64.o: $(SRCDIR)test/example.c $(SRCDIR)zlib.h zconf.h
	$(CC) $(CFLAGS) $(ZINCOUT) -D_FILE_OFFSET_BITS=64 -c -o $@ $(SRCDIR)test/example.c

minigzip64.o: $(SRCDIR)test/minigzip.c $(SRCDIR)zlib.h zconf.h
	$(CC) $(CFLAGS) $(ZINCOUT) -D_FILE_OFFSET_BITS=64 -c -o $@ $(SRCDIR)test/minigzip.c


adler32.o: $(SRCDIR)adler32.c
	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)adler32.c

crc32.o: $(SRCDIR)crc32.c
	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)crc32.c

deflate.o: $(SRCDIR)deflate.c
	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)deflate.c

infback.o: $(SRCDIR)infback.c
	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)infback.c

inffast.o: $(SRCDIR)inffast.c
	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)inffast.c

inflate.o: $(SRCDIR)inflate.c
	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)inflate.c

inftrees.o: $(SRCDIR)inftrees.c
	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)inftrees.c

trees.o: $(SRCDIR)trees.c
	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)trees.c

zutil.o: $(SRCDIR)zutil.c
	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)zutil.c

compress.o: $(SRCDIR)compress.c
	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)compress.c

uncompr.o: $(SRCDIR)uncompr.c
	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)uncompr.c

gzclose.o: $(SRCDIR)gzclose.c
	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)gzclose.c

gzlib.o: $(SRCDIR)gzlib.c
	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)gzlib.c

gzread.o: $(SRCDIR)gzread.c
	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)gzread.c

gzwrite.o: $(SRCDIR)gzwrite.c
	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)gzwrite.c


adler32.lo: $(SRCDIR)adler32.c
	-@mkdir objs 2>/dev/null || test -d objs
	$(CC) $(SFLAGS) $(ZINC) -fPIC -c -o objs/adler32.o $(SRCDIR)adler32.c
	-@mv objs/adler32.o $@

crc32.lo: $(SRCDIR)crc32.c
	-@mkdir objs 2>/dev/null || test -d objs
	$(CC) $(SFLAGS) $(ZINC) -fPIC -c -o objs/crc32.o $(SRCDIR)crc32.c
	-@mv objs/crc32.o $@

deflate.lo: $(SRCDIR)deflate.c
	-@mkdir objs 2>/dev/null || test -d objs
	$(CC) $(SFLAGS) $(ZINC) -fPIC -c -o objs/deflate.o $(SRCDIR)deflate.c
	-@mv objs/deflate.o $@

infback.lo: $(SRCDIR)infback.c
	-@mkdir objs 2>/dev/null || test -d objs
	$(CC) $(SFLAGS) $(ZINC) -fPIC -c -o objs/infback.o $(SRCDIR)infback.c
	-@mv objs/infback.o $@

inffast.lo: $(SRCDIR)inffast.c
	-@mkdir objs 2>/dev/null || test -d objs
	$(CC) $(SFLAGS) $(ZINC) -fPIC -c -o objs/inffast.o $(SRCDIR)inffast.c
	-@mv objs/inffast.o $@

inflate.lo: $(SRCDIR)inflate.c
	-@mkdir objs 2>/dev/null || test -d objs
	$(CC) $(SFLAGS) $(ZINC) -fPIC -c -o objs/inflate.o $(SRCDIR)inflate.c
	-@mv objs/inflate.o $@

inftrees.lo: $(SRCDIR)inftrees.c
	-@mkdir objs 2>/dev/null || test -d objs
	$(CC) $(SFLAGS) $(ZINC) -fPIC -c -o objs/inftrees.o $(SRCDIR)inftrees.c
	-@mv objs/inftrees.o $@

trees.lo: $(SRCDIR)trees.c
	-@mkdir objs 2>/dev/null || test -d objs
	$(CC) $(SFLAGS) $(ZINC) -fPIC -c -o objs/trees.o $(SRCDIR)trees.c
	-@mv objs/trees.o $@

zutil.lo: $(SRCDIR)zutil.c
	-@mkdir objs 2>/dev/null || test -d objs
	$(CC) $(SFLAGS) $(ZINC) -fPIC -c -o objs/zutil.o $(SRCDIR)zutil.c
	-@mv objs/zutil.o $@

compress.lo: $(SRCDIR)compress.c
	-@mkdir objs 2>/dev/null || test -d objs
	$(CC) $(SFLAGS) $(ZINC) -fPIC -c -o objs/compress.o $(SRCDIR)compress.c
	-@mv objs/compress.o $@

uncompr.lo: $(SRCDIR)uncompr.c
	-@mkdir objs 2>/dev/null || test -d objs
	$(CC) $(SFLAGS) $(ZINC) -fPIC -c -o objs/uncompr.o $(SRCDIR)uncompr.c
	-@mv objs/uncompr.o $@

gzclose.lo: $(SRCDIR)gzclose.c
	-@mkdir objs 2>/dev/null || test -d objs
	$(CC) $(SFLAGS) $(ZINC) -fPIC -c -o objs/gzclose.o $(SRCDIR)gzclose.c
	-@mv objs/gzclose.o $@

gzlib.lo: $(SRCDIR)gzlib.c
	-@mkdir objs 2>/dev/null || test -d objs
	$(CC) $(SFLAGS) $(ZINC) -fPIC -c -o objs/gzlib.o $(SRCDIR)gzlib.c
	-@mv objs/gzlib.o $@

gzread.lo: $(SRCDIR)gzread.c
	-@mkdir objs 2>/dev/null || test -d objs
	$(CC) $(SFLAGS) $(ZINC) -fPIC -c -o objs/gzread.o $(SRCDIR)gzread.c
	-@mv objs/gzread.o $@

gzwrite.lo: $(SRCDIR)gzwrite.c
	-@mkdir objs 2>/dev/null || test -d objs
	$(CC) $(SFLAGS) $(ZINC) -fPIC -c -o objs/gzwrite.o $(SRCDIR)gzwrite.c
	-@mv objs/gzwrite.o $@


placebo $(SHAREDLIBV): $(PIC_OBJS) libz.a
	$(LDSHARED) $(SFLAGS) -o $@ $(PIC_OBJS) $(LDSHAREDLIBC) $(LDFLAGS)
	rm -f $(SHAREDLIB) $(SHAREDLIBM)
	ln -s $@ $(SHAREDLIB)
	ln -s $@ $(SHAREDLIBM)
	-@rmdir objs

example$(EXE): example.o $(STATICLIB)
	$(CC) $(CFLAGS) -o $@ example.o $(TEST_LDFLAGS)

minigzip$(EXE): minigzip.o $(STATICLIB)
	$(CC) $(CFLAGS) -o $@ minigzip.o $(TEST_LDFLAGS)

examplesh$(EXE): example.o $(SHAREDLIBV)
	$(CC) $(CFLAGS) -o $@ example.o -L. $(SHAREDLIBV)

minigzipsh$(EXE): minigzip.o $(SHAREDLIBV)
	$(CC) $(CFLAGS) -o $@ minigzip.o -L. $(SHAREDLIBV)

example64$(EXE): example64.o $(STATICLIB)
	$(CC) $(CFLAGS) -o $@ example64.o $(TEST_LDFLAGS)

minigzip64$(EXE): minigzip64.o $(STATICLIB)
	$(CC) $(CFLAGS) -o $@ minigzip64.o $(TEST_LDFLAGS)

install-libs: $(LIBS)
	-@if [ ! -d $(DESTDIR)$(exec_prefix)  ]; then mkdir -p $(DESTDIR)$(exec_prefix); fi
	-@if [ ! -d $(DESTDIR)$(libdir)       ]; then mkdir -p $(DESTDIR)$(libdir); fi
	-@if [ ! -d $(DESTDIR)$(sharedlibdir) ]; then mkdir -p $(DESTDIR)$(sharedlibdir); fi
	-@if [ ! -d $(DESTDIR)$(man3dir)      ]; then mkdir -p $(DESTDIR)$(man3dir); fi
	-@if [ ! -d $(DESTDIR)$(pkgconfigdir) ]; then mkdir -p $(DESTDIR)$(pkgconfigdir); fi
	rm -f $(DESTDIR)$(libdir)/$(STATICLIB)
	cp $(STATICLIB) $(DESTDIR)$(libdir)
	chmod 644 $(DESTDIR)$(libdir)/$(STATICLIB)
	-@($(RANLIB) $(DESTDIR)$(libdir)/libz.a || true) >/dev/null 2>&1
	-@if test -n "$(SHAREDLIBV)"; then \
	  rm -f $(DESTDIR)$(sharedlibdir)/$(SHAREDLIBV); \
	  cp $(SHAREDLIBV) $(DESTDIR)$(sharedlibdir); \
	  echo "cp $(SHAREDLIBV) $(DESTDIR)$(sharedlibdir)"; \
	  chmod 755 $(DESTDIR)$(sharedlibdir)/$(SHAREDLIBV); \
	  echo "chmod 755 $(DESTDIR)$(sharedlibdir)/$(SHAREDLIBV)"; \
	  rm -f $(DESTDIR)$(sharedlibdir)/$(SHAREDLIB) $(DESTDIR)$(sharedlibdir)/$(SHAREDLIBM); \
	  ln -s $(SHAREDLIBV) $(DESTDIR)$(sharedlibdir)/$(SHAREDLIB); \
	  ln -s $(SHAREDLIBV) $(DESTDIR)$(sharedlibdir)/$(SHAREDLIBM); \
	  ($(LDCONFIG) || true)  >/dev/null 2>&1; \
	fi
	rm -f $(DESTDIR)$(man3dir)/zlib.3
	cp $(SRCDIR)zlib.3 $(DESTDIR)$(man3dir)
	chmod 644 $(DESTDIR)$(man3dir)/zlib.3
	rm -f $(DESTDIR)$(pkgconfigdir)/zlib.pc
	cp zlib.pc $(DESTDIR)$(pkgconfigdir)
	chmod 644 $(DESTDIR)$(pkgconfigdir)/zlib.pc
# The ranlib in install is needed on NeXTSTEP which checks file times
# ldconfig is for Linux

install: install-libs
	-@if [ ! -d $(DESTDIR)$(includedir)   ]; then mkdir -p $(DESTDIR)$(includedir); fi
	rm -f $(DESTDIR)$(includedir)/zlib.h $(DESTDIR)$(includedir)/zconf.h
	cp $(SRCDIR)zlib.h zconf.h $(DESTDIR)$(includedir)
	chmod 644 $(DESTDIR)$(includedir)/zlib.h $(DESTDIR)$(includedir)/zconf.h

uninstall:
	cd $(DESTDIR)$(includedir) && rm -f zlib.h zconf.h
	cd $(DESTDIR)$(libdir) && rm -f libz.a; \
	if test -n "$(SHAREDLIBV)" -a -f $(SHAREDLIBV); then \
	  rm -f $(SHAREDLIBV) $(SHAREDLIB) $(SHAREDLIBM); \
	fi
	cd $(DESTDIR)$(man3dir) && rm -f zlib.3
	cd $(DESTDIR)$(pkgconfigdir) && rm -f zlib.pc

docs: zlib.3.pdf

zlib.3.pdf: $(SRCDIR)zlib.3
	groff -mandoc -f H -T ps $(SRCDIR)zlib.3 | ps2pdf - $@

zconf.h.cmakein: $(SRCDIR)zconf.h.in
	-@ TEMPFILE=zconfh_$$; \
	echo "/#define ZCONF_H/ a\\\\\n#cmakedefine Z_PREFIX\\\\\n#cmakedefine Z_HAVE_UNISTD_H\n" >> $$TEMPFILE &&\
	sed -f $$TEMPFILE $(SRCDIR)zconf.h.in > $@ &&\
	touch -r $(SRCDIR)zconf.h.in $@ &&\
	rm $$TEMPFILE

zconf: $(SRCDIR)zconf.h.in
	cp -p $(SRCDIR)zconf.h.in zconf.h

mostlyclean: clean
clean:
	rm -f *.o *.lo *~ \
	   example$(EXE) minigzip$(EXE) examplesh$(EXE) minigzipsh$(EXE) \
	   example64$(EXE) minigzip64$(EXE) \
	   infcover \
	   libz.* foo.gz so_locations \
	   _match.s maketree contrib/infback9/*.o
	rm -rf objs
	rm -f *.gcda *.gcno *.gcov
	rm -f contrib/infback9/*.gcda contrib/infback9/*.gcno contrib/infback9/*.gcov

maintainer-clean: distclean
distclean: clean zconf zconf.h.cmakein
	rm -f Makefile zlib.pc configure.log
	-@rm -f .DS_Store
	@if [ -f Makefile.in ]; then \
	printf 'all:\n\t-@echo "Please use ./configure first.  Thank you."\n' > Makefile ; \
	printf '\ndistclean:\n\tmake -f Makefile.in distclean\n' >> Makefile ; \
	touch -r $(SRCDIR)Makefile.in Makefile ; fi

tags:
	etags $(SRCDIR)*.[ch]

adler32.o zutil.o: $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h
gzclose.o gzlib.o gzread.o gzwrite.o: $(SRCDIR)zlib.h zconf.h $(SRCDIR)gzguts.h
compress.o example.o minigzip.o uncompr.o: $(SRCDIR)zlib.h zconf.h
crc32.o: $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h $(SRCDIR)crc32.h
deflate.o: $(SRCDIR)deflate.h $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h
infback.o inflate.o: $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h $(SRCDIR)inftrees.h $(SRCDIR)inflate.h $(SRCDIR)inffast.h $(SRCDIR)inffixed.h
inffast.o: $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h $(SRCDIR)inftrees.h $(SRCDIR)inflate.h $(SRCDIR)inffast.h
inftrees.o: $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h $(SRCDIR)inftrees.h
trees.o: $(SRCDIR)deflate.h $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h $(SRCDIR)trees.h

adler32.lo zutil.lo: $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h
gzclose.lo gzlib.lo gzread.lo gzwrite.lo: $(SRCDIR)zlib.h zconf.h $(SRCDIR)gzguts.h
compress.lo example.lo minigzip.lo uncompr.lo: $(SRCDIR)zlib.h zconf.h
crc32.lo: $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h $(SRCDIR)crc32.h
deflate.lo: $(SRCDIR)deflate.h $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h
infback.lo inflate.lo: $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h $(SRCDIR)inftrees.h $(SRCDIR)inflate.h $(SRCDIR)inffast.h $(SRCDIR)inffixed.h
inffast.lo: $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h $(SRCDIR)inftrees.h $(SRCDIR)inflate.h $(SRCDIR)inffast.h
inftrees.lo: $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h $(SRCDIR)inftrees.h
trees.lo: $(SRCDIR)deflate.h $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h $(SRCDIR)trees.h

# Makefile for zlib
# Copyright (C) 1995-2017 Jean-loup Gailly, Mark Adler
# For conditions of distribution and use, see copyright notice in zlib.h

# To compile and test, type:
#    ./configure; make test
# Normally configure builds both a static and a shared library.
# If you want to build just a static library, use: ./configure --static

# To use the asm code, type:
#    cp contrib/asm?86/match.S ./match.S
#    make LOC=-DASMV OBJA=match.o

# To install /usr/local/lib/libz.* and /usr/local/include/zlib.h, type:
#    make install
# To install in $HOME instead of /usr/local, use:
#    make install prefix=$HOME

CC=cc

CFLAGS=-O
#CFLAGS=-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7
#CFLAGS=-g -DZLIB_DEBUG
#CFLAGS=-O3 -Wall -Wwrite-strings -Wpointer-arith -Wconversion \
#           -Wstrict-prototypes -Wmissing-prototypes

SFLAGS=-O
LDFLAGS=
TEST_LDFLAGS=-L. libz.a
LDSHARED=$(CC)
CPP=$(CC) -E

STATICLIB=libz.a
SHAREDLIB=libz.so
SHAREDLIBV=libz.so.1.2.12
SHAREDLIBM=libz.so.1
LIBS=$(STATICLIB) $(SHAREDLIBV)

AR=ar
ARFLAGS=rc
RANLIB=ranlib
LDCONFIG=ldconfig

check: test

test: all teststatic testshared

teststatic: static
	@TMPST=tmpst_$$; \
	if echo hello world | ./minigzip | ./minigzip -d && ./example $$TMPST ; then \
	  echo '		*** zlib test OK ***'; \
	else \
	  echo '		*** zlib test FAILED ***'; false; \
	fi
	@rm -f tmpst_$$

testshared: shared
	@LD_LIBRARY_PATH=`pwd`:$(LD_LIBRARY_PATH) ; export LD_LIBRARY_PATH; \
	LD_LIBRARYN32_PATH=`pwd`:$(LD_LIBRARYN32_PATH) ; export LD_LIBRARYN32_PATH; \
	DYLD_LIBRARY_PATH=`pwd`:$(DYLD_LIBRARY_PATH) ; export DYLD_LIBRARY_PATH; \
	SHLIB_PATH=`pwd`:$(SHLIB_PATH) ; export SHLIB_PATH; \
	TMPSH=tmpsh_$$; \
	if echo hello world | ./minigzipsh | ./minigzipsh -d && ./examplesh $$TMPSH; then \
	  echo '		*** zlib shared test OK ***'; \
	else \
	  echo '		*** zlib shared test FAILED ***'; false; \
	fi
	@rm -f tmpsh_$$

test64: all64
	@TMP64=tmp64_$$; \
	if echo hello world | ./minigzip64 | ./minigzip64 -d && ./example64 $$TMP64; then \
	  echo '		*** zlib 64-bit test OK ***'; \
	else \
	  echo '		*** zlib 64-bit test FAILED ***'; false; \
	fi
	@rm -f tmp64_$$

infcover.o: $(SRCDIR)test/infcover.c $(SRCDIR)zlib.h zconf.h
	$(CC) $(CFLAGS) $(ZINCOUT) -c -o $@ $(SRCDIR)test/infcover.c

infcover: infcover.o libz.a
	$(CC) $(CFLAGS) -o $@ infcover.o libz.a

cover: infcover
	rm -f *.gcda
	./infcover
	gcov inf*.c

libz.a: $(OBJS)
	$(AR) $(ARFLAGS) $@ $(OBJS)
	-@ ($(RANLIB) $@ || true) >/dev/null 2>&1

match.o: match.S

example$(EXE): example.o $(STATICLIB)
	$(CC) $(CFLAGS) -o $@ example.o $(TEST_LDFLAGS)

minigzip$(EXE): minigzip.o $(STATICLIB)
	$(CC) $(CFLAGS) -o $@ minigzip.o $(TEST_LDFLAGS)

examplesh$(EXE): example.o $(SHAREDLIBV)
	$(CC) $(CFLAGS) -o $@ example.o -L. $(SHAREDLIBV)

minigzipsh$(EXE): minigzip.o $(SHAREDLIBV)
	$(CC) $(CFLAGS) -o $@ minigzip.o -L. $(SHAREDLIBV)

example64$(EXE): example64.o $(STATICLIB)
	$(CC) $(CFLAGS) -o $@ example64.o $(TEST_LDFLAGS)

minigzip64$(EXE): minigzip64.o $(STATICLIB)
	$(CC) $(CFLAGS) -o $@ minigzip64.o $(TEST_LDFLAGS)

	sed -f $$TEMPFILE $(SRCDIR)zconf.h.in > $@ &&\
	touch -r $(SRCDIR)zconf.h.in $@ &&\
	rm $$TEMPFILE

zconf: $(SRCDIR)zconf.h.in
	cp -p $(SRCDIR)zconf.h.in zconf.h







mostlyclean: clean
clean:
	rm -f *.o *.lo *~ \
	   example$(EXE) minigzip$(EXE) examplesh$(EXE) minigzipsh$(EXE) \
	   example64$(EXE) minigzip64$(EXE) \
	   infcover \
	   libz.* foo.gz so_locations \
	   _match.s maketree contrib/infback9/*.o
	rm -rf objs

ZLIB DATA COMPRESSION LIBRARY

zlib 1.2.12 is a general purpose data compression library.  All the code is
thread safe.  The data format used by the zlib library is described by RFCs
(Request for Comments) 1950 to 1952 in the files
http://tools.ietf.org/html/rfc1950 (zlib format), rfc1951 (deflate format) and
rfc1952 (gzip format).

All functions of the compression library are documented in the file zlib.h
(volunteer to write man pages welcome, contact zlib@gzip.org).  A usage example

verify that you have the latest version of zlib; otherwise get the latest
version and check whether the problem still exists or not.

PLEASE read the zlib FAQ http://zlib.net/zlib_faq.html before asking for help.

Mark Nelson <markn@ieee.org> wrote an article about zlib for the Jan.  1997
issue of Dr.  Dobb's Journal; a copy of the article is available at
http://marknelson.us/1997/01/01/zlib-engine/ .

The changes made in version 1.2.12 are documented in the file ChangeLog.

Unsupported third party contributions are provided in directory contrib/ .

zlib is available in Java using the java.util.zip package, documented at
http://java.sun.com/developer/technicalArticles/Programming/compression/ .

A Perl interface to zlib written by Paul Marquess <pmqs@cpan.org> is available
at CPAN (Comprehensive Perl Archive Network) sites, including
http://search.cpan.org/~pmqs/IO-Compress-Zlib/ .

A Python interface to zlib written by A.M. Kuchling <amk@amk.ca> is
available in Python 1.5 and later versions, see
http://docs.python.org/library/zlib.html .

zlib is built into tcl: http://wiki.tcl.tk/4610 .

- For 64-bit Irix, deflate.c must be compiled without any optimization. With
  -O, one libpng test fails. The test works in 32 bit mode (with the -n32
  compiler flag). The compiler bug has been reported to SGI.

- zlib doesn't work with gcc 2.6.3 on a DEC 3000/300LX under OSF/1 2.1 it works
  when compiled with cc.

- On Digital Unix 4.0D (formely OSF/1) on AlphaServer, the cc option -std1 is
  necessary to get gzprintf working correctly. This is done by configure.

- zlib doesn't work on HP-UX 9.05 with some versions of /bin/cc. It works with
  other compilers. Use "make test" to check your compiler.

- gzdopen is not supported on RISCOS or BEOS.

- For PalmOs, see http://palmzlib.sourceforge.net/


Acknowledgments:

  The deflate format used by zlib was defined by Phil Katz.  The deflate and
  zlib specifications were written by L.  Peter Deutsch.  Thanks to all the
  people who reported problems and suggested various improvements in zlib; they
  are too numerous to cite here.

Copyright notice:

 (C) 1995-2022 Jean-loup Gailly and Mark Adler

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it

/* adler32.c -- compute the Adler-32 checksum of a data stream
 * Copyright (C) 1995-2011, 2016 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */

/* @(#) $Id$ */

#include "zutil.h"

local uLong adler32_combine_ OF((uLong adler1, uLong adler2, z_off64_t len2));

#define BASE 65521U     /* largest prime smaller than 65536 */
#define NMAX 5552
/* NMAX is the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1 */

#define DO1(buf,i)  {adler += (buf)[i]; sum2 += adler;}
#define DO2(buf,i)  DO1(buf,i); DO1(buf,i+1);
#define DO4(buf,i)  DO2(buf,i); DO2(buf,i+2);

#else
#  define MOD(a) a %= BASE
#  define MOD28(a) a %= BASE
#  define MOD63(a) a %= BASE
#endif

/* ========================================================================= */
uLong ZEXPORT adler32_z(adler, buf, len)
    uLong adler;
    const Bytef *buf;
    z_size_t len;
{
    unsigned long sum2;
    unsigned n;

    /* split Adler-32 into component sums */
    sum2 = (adler >> 16) & 0xffff;
    adler &= 0xffff;

    }

    /* return recombined sums */
    return adler | (sum2 << 16);
}

/* ========================================================================= */
uLong ZEXPORT adler32(adler, buf, len)
    uLong adler;
    const Bytef *buf;
    uInt len;
{
    return adler32_z(adler, buf, len);
}

/* ========================================================================= */
local uLong adler32_combine_(adler1, adler2, len2)
    uLong adler1;
    uLong adler2;
    z_off64_t len2;
{
    unsigned long sum1;
    unsigned long sum2;
    unsigned rem;

    /* for negative len, return invalid adler32 as a clue for debugging */
    if (len2 < 0)
        return 0xffffffffUL;

    if (sum1 >= BASE) sum1 -= BASE;
    if (sum2 >= ((unsigned long)BASE << 1)) sum2 -= ((unsigned long)BASE << 1);
    if (sum2 >= BASE) sum2 -= BASE;
    return sum1 | (sum2 << 16);
}

/* ========================================================================= */
uLong ZEXPORT adler32_combine(adler1, adler2, len2)
    uLong adler1;
    uLong adler2;
    z_off_t len2;
{
    return adler32_combine_(adler1, adler2, len2);
}

uLong ZEXPORT adler32_combine64(adler1, adler2, len2)
    uLong adler1;
    uLong adler2;
    z_off64_t len2;
{
    return adler32_combine_(adler1, adler2, len2);
}

   destination buffer, which must be at least 0.1% larger than sourceLen plus
   12 bytes. Upon exit, destLen is the actual size of the compressed buffer.

     compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
   memory, Z_BUF_ERROR if there was not enough room in the output buffer,
   Z_STREAM_ERROR if the level parameter is invalid.
*/
int ZEXPORT compress2 (dest, destLen, source, sourceLen, level)
    Bytef *dest;
    uLongf *destLen;
    const Bytef *source;
    uLong sourceLen;
    int level;
{
    z_stream stream;
    int err;
    const uInt max = (uInt)-1;
    uLong left;

    left = *destLen;
    *destLen = 0;

    *destLen = stream.total_out;
    deflateEnd(&stream);
    return err == Z_STREAM_END ? Z_OK : err;
}

/* ===========================================================================
 */
int ZEXPORT compress (dest, destLen, source, sourceLen)
    Bytef *dest;
    uLongf *destLen;
    const Bytef *source;
    uLong sourceLen;
{
    return compress2(dest, destLen, source, sourceLen, Z_DEFAULT_COMPRESSION);
}

/* ===========================================================================
     If the default memLevel or windowBits for deflateInit() is changed, then
   this function needs to be updated.
 */
uLong ZEXPORT compressBound (sourceLen)
    uLong sourceLen;
{
    return sourceLen + (sourceLen >> 12) + (sourceLen >> 14) +
           (sourceLen >> 25) + 13;
}

    ZINC='-include zconf.h'
    ZINCOUT='-I. -I$(SRCDIR)'
    SRCDIR="$SRCDIR/"
fi

# set command prefix for cross-compilation
if [ -n "${CHOST}" ]; then
    uname="`echo "${CHOST}" | sed -e 's/^[^-]*-\([^-]*\)$/\1/' -e 's/^[^-]*-[^-]*-\([^-]*\)$/\1/' -e 's/^[^-]*-[^-]*-\([^-]*\)-.*$/\1/'`"

    CROSS_PREFIX="${CHOST}-"


fi

# destination name for static library
STATICLIB=libz.a

# extract zlib version numbers from zlib.h
VER=`sed -n -e '/VERSION "/s/.*"\(.*\)".*/\1/p' < ${SRCDIR}zlib.h`
VER3=`sed -n -e '/VERSION "/s/.*"\([0-9]*\\.[0-9]*\\.[0-9]*\).*/\1/p' < ${SRCDIR}zlib.h`
VER2=`sed -n -e '/VERSION "/s/.*"\([0-9]*\\.[0-9]*\)\\..*/\1/p' < ${SRCDIR}zlib.h`
VER1=`sed -n -e '/VERSION "/s/.*"\([0-9]*\)\\..*/\1/p' < ${SRCDIR}zlib.h`

# establish commands for library building
if "${CROSS_PREFIX}ar" --version >/dev/null 2>/dev/null || test $? -lt 126; then
    AR=${AR-"${CROSS_PREFIX}ar"}
    test -n "${CROSS_PREFIX}" && echo Using ${AR} | tee -a configure.log
else

cover=0
zprefix=0
zconst=0
build64=0
gcc=0
warn=0
debug=0
sanitize=0

old_cc="$CC"
old_cflags="$CFLAGS"
OBJC='$(OBJZ) $(OBJG)'
PIC_OBJC='$(PIC_OBJZ) $(PIC_OBJG)'

# leave this script, optionally in a bad way
leave()
{
  if test "$*" != "0"; then
    echo "** $0 aborting." | tee -a configure.log
  fi
  rm -f $test.[co] $test $test$shared_ext $test.gcno ./--version
  echo -------------------- >> configure.log
  echo >> configure.log
  echo >> configure.log
  exit $1
}

# process command line options

    -6* | --64) build64=1; shift ;;
    -a*=* | --archs=*) ARCHS=`echo $1 | sed 's/.*=//'`; shift ;;
    --sysconfdir=*) echo "ignored option: --sysconfdir" | tee -a configure.log; shift ;;
    --localstatedir=*) echo "ignored option: --localstatedir" | tee -a configure.log; shift ;;
    -c* | --const) zconst=1; shift ;;
    -w* | --warn) warn=1; shift ;;
    -d* | --debug) debug=1; shift ;;


    --sanitize) sanitize=1; shift ;;
    *)
      echo "unknown option: $1" | tee -a configure.log
      echo "$0 --help for help" | tee -a configure.log
      leave 1;;
    esac
done

if test -z "$CC"; then
  echo Checking for ${CROSS_PREFIX}gcc... | tee -a configure.log
  if ${CROSS_PREFIX}gcc -v >/dev/null 2>&1; then
    cc=${CROSS_PREFIX}gcc
  else
    cc=${CROSS_PREFIX}cc
  fi


fi
cflags=${CFLAGS-"-O3"}
# to force the asm version use: CFLAGS="-O3 -DASMV" ./configure
case "$cc" in
  *gcc*) gcc=1 ;;
  *clang*) gcc=1 ;;
esac
case `$cc -v 2>&1` in
  *gcc*) gcc=1 ;;
  *clang*) gcc=1 ;;

  fi
  if test $build64 -eq 1; then
    CFLAGS="${CFLAGS} -m64"
    SFLAGS="${SFLAGS} -m64"
  fi
  if test "$warn" -eq 1; then
    if test "$zconst" -eq 1; then
      CFLAGS="${CFLAGS} -Wall -Wextra -Wcast-qual -pedantic -DZLIB_CONST"
    else
      CFLAGS="${CFLAGS} -Wall -Wextra -pedantic"
    fi
  fi
  if test $sanitize -eq 1; then
    CFLAGS="${CFLAGS} -fsanitize=address"



  fi
  if test $debug -eq 1; then
    CFLAGS="${CFLAGS} -DZLIB_DEBUG"
    SFLAGS="${SFLAGS} -DZLIB_DEBUG"
  fi
  if test -z "$uname"; then
    uname=`(uname -s || echo unknown) 2>/dev/null`
  fi
  case "$uname" in
  Linux* | linux* | GNU | GNU/* | solaris*)




        LDSHARED=${LDSHARED-"$cc -shared -Wl,-soname,libz.so.1,--version-script,${SRCDIR}zlib.map"} ;;
  *BSD | *bsd* | DragonFly)
        LDSHARED=${LDSHARED-"$cc -shared -Wl,-soname,libz.so.1,--version-script,${SRCDIR}zlib.map"}
        LDCONFIG="ldconfig -m" ;;
  CYGWIN* | Cygwin* | cygwin* | OS/2*)
        EXE='.exe' ;;
  MINGW* | mingw*)
# temporary bypass
        rm -f $test.[co] $test $test$shared_ext
        echo "Please use win32/Makefile.gcc instead." | tee -a configure.log
        leave 1
        LDSHARED=${LDSHARED-"$cc -shared"}
        LDSHAREDLIBC=""
        EXE='.exe' ;;
  QNX*)  # This is for QNX6. I suppose that the QNX rule below is for QNX2,QNX4
         # (alain.bonnefoy@icbt.com)
                 LDSHARED=${LDSHARED-"$cc -shared -Wl,-hlibz.so.1"} ;;
  HP-UX*)
         LDSHARED=${LDSHARED-"$cc -shared $SFLAGS"}
         case `(uname -m || echo unknown) 2>/dev/null` in
         ia64)
                 shared_ext='.so'
                 SHAREDLIB='libz.so' ;;
         *)
                 shared_ext='.sl'
                 SHAREDLIB='libz.sl' ;;
         esac ;;


  Darwin* | darwin*)
             shared_ext='.dylib'
             SHAREDLIB=libz$shared_ext
             SHAREDLIBV=libz.$VER$shared_ext
             SHAREDLIBM=libz.$VER1$shared_ext
             LDSHARED=${LDSHARED-"$cc -dynamiclib -install_name $libdir/$SHAREDLIBM -compatibility_version $VER1 -current_version $VER3"}


             if libtool -V 2>&1 | grep Apple > /dev/null; then
                 AR="libtool"
             else
                 AR="/usr/bin/libtool"
             fi
             ARFLAGS="-o" ;;

  *)             LDSHARED=${LDSHARED-"$cc -shared"} ;;
  esac
else
  # find system name and corresponding cc options
  CC=${CC-cc}
  gcc=0
  echo ... using $CC >> configure.log
  if test -z "$uname"; then

  SHAREDLIBM=""
  echo Building static library $STATICLIB version $VER with $CC. | tee -a configure.log
else
  ALL="static shared"
  TEST="all teststatic testshared"
fi

# check for underscores in external names for use by assembler code
CPP=${CPP-"$CC -E"}
case $CFLAGS in
  *ASMV*)
    echo >> configure.log
    show "$NM $test.o | grep _hello"
    if test "`$NM $test.o | grep _hello | tee -a configure.log`" = ""; then
      CPP="$CPP -DNO_UNDERLINE"
      echo Checking for underline in external names... No. | tee -a configure.log
    else
      echo Checking for underline in external names... Yes. | tee -a configure.log
    fi ;;
esac

echo >> configure.log

# check for size_t
cat > $test.c <<EOF
#include <stdio.h>
#include <stdlib.h>
size_t dummy = 0;

echo includedir = $includedir >> configure.log
echo libdir = $libdir >> configure.log
echo mandir = $mandir >> configure.log
echo prefix = $prefix >> configure.log
echo sharedlibdir = $sharedlibdir >> configure.log
echo uname = $uname >> configure.log

# udpate Makefile with the configure results
sed < ${SRCDIR}Makefile.in "
/^CC *=/s#=.*#=$CC#
/^CFLAGS *=/s#=.*#=$CFLAGS#
/^SFLAGS *=/s#=.*#=$SFLAGS#
/^LDFLAGS *=/s#=.*#=$LDFLAGS#
/^LDSHARED *=/s#=.*#=$LDSHARED#
/^CPP *=/s#=.*#=$CPP#

All files under this contrib directory are UNSUPPORTED. There were
provided by users of zlib and were not tested by the authors of zlib.
Use at your own risk. Please contact the authors of the contributions
for help about these, not the zlib authors. Thanks.


ada/        by Dmitriy Anisimkov <anisimkov@yahoo.com>
        Support for Ada

----------------------------------------------------------------
--  ZLib for Ada thick binding.                               --
--                                                            --
--  Copyright (C) 2002-2004 Dmitriy Anisimkov                 --
--                                                            --
--  Open source license information is in the zlib.ads file.  --
----------------------------------------------------------------
--
--  $Id: buffer_demo.adb,v 1.3 2004/09/06 06:55:35 vagul Exp $

--  This demo program provided by Dr Steve Sangwine <sjs@essex.ac.uk>
--
--  Demonstration of a problem with Zlib-Ada (already fixed) when a buffer
--  of exactly the correct size is used for decompressed data, and the last
--  few bytes passed in to Zlib are checksum bytes.

--  This program compresses a string of text, and then decompresses the
--  compressed text into a buffer of the same size as the original text.

with Ada.Streams; use Ada.Streams;
with Ada.Text_IO;

with ZLib; use ZLib;

procedure Buffer_Demo is
   EOL  : Character renames ASCII.LF;
   Text : constant String
     := "Four score and seven years ago our fathers brought forth," & EOL &
        "upon this continent, a new nation, conceived in liberty," & EOL &
        "and dedicated to the proposition that `all men are created equal'.";

   Source : Stream_Element_Array (1 .. Text'Length);
   for Source'Address use Text'Address;

begin
   Ada.Text_IO.Put (Text);
   Ada.Text_IO.New_Line;
   Ada.Text_IO.Put_Line
     ("Uncompressed size : " & Positive'Image (Text'Length) & " bytes");

   declare
      Compressed_Data : Stream_Element_Array (1 .. Text'Length);
      L               : Stream_Element_Offset;
   begin
      Compress : declare
         Compressor : Filter_Type;
         I : Stream_Element_Offset;
      begin
         Deflate_Init (Compressor);

         --  Compress the whole of T at once.

         Translate (Compressor, Source, I, Compressed_Data, L, Finish);
         pragma Assert (I = Source'Last);

         Close (Compressor);

         Ada.Text_IO.Put_Line
           ("Compressed size :   "
            & Stream_Element_Offset'Image (L) & " bytes");
      end Compress;

      --  Now we decompress the data, passing short blocks of data to Zlib
      --  (because this demonstrates the problem - the last block passed will
      --  contain checksum information and there will be no output, only a
      --  check inside Zlib that the checksum is correct).

      Decompress : declare
         Decompressor : Filter_Type;

         Uncompressed_Data : Stream_Element_Array (1 .. Text'Length);

         Block_Size : constant := 4;
         --  This makes sure that the last block contains
         --  only Adler checksum data.

         P : Stream_Element_Offset := Compressed_Data'First - 1;
         O : Stream_Element_Offset;
      begin
         Inflate_Init (Decompressor);

         loop
            Translate
              (Decompressor,
               Compressed_Data
                 (P + 1 .. Stream_Element_Offset'Min (P + Block_Size, L)),
               P,
               Uncompressed_Data
                 (Total_Out (Decompressor) + 1 .. Uncompressed_Data'Last),
               O,
               No_Flush);

               Ada.Text_IO.Put_Line
                 ("Total in : " & Count'Image (Total_In (Decompressor)) &
                  ", out : " & Count'Image (Total_Out (Decompressor)));

               exit when P = L;
         end loop;

         Ada.Text_IO.New_Line;
         Ada.Text_IO.Put_Line
           ("Decompressed text matches original text : "
             & Boolean'Image (Uncompressed_Data = Source));
      end Decompress;
   end;
end Buffer_Demo;

----------------------------------------------------------------
--  ZLib for Ada thick binding.                               --
--                                                            --
--  Copyright (C) 2002-2003 Dmitriy Anisimkov                 --
--                                                            --
--  Open source license information is in the zlib.ads file.  --
----------------------------------------------------------------
--  Continuous test for ZLib multithreading. If the test would fail
--  we should provide thread safe allocation routines for the Z_Stream.
--
--  $Id: mtest.adb,v 1.4 2004/07/23 07:49:54 vagul Exp $

with ZLib;
with Ada.Streams;
with Ada.Numerics.Discrete_Random;
with Ada.Text_IO;
with Ada.Exceptions;
with Ada.Task_Identification;

procedure MTest is
   use Ada.Streams;
   use ZLib;

   Stop : Boolean := False;

   pragma Atomic (Stop);

   subtype Visible_Symbols is Stream_Element range 16#20# .. 16#7E#;

   package Random_Elements is
      new Ada.Numerics.Discrete_Random (Visible_Symbols);

   task type Test_Task;

   task body Test_Task is
      Buffer : Stream_Element_Array (1 .. 100_000);
      Gen : Random_Elements.Generator;

      Buffer_First  : Stream_Element_Offset;
      Compare_First : Stream_Element_Offset;

      Deflate : Filter_Type;
      Inflate : Filter_Type;

      procedure Further (Item : in Stream_Element_Array);

      procedure Read_Buffer
        (Item : out Ada.Streams.Stream_Element_Array;
         Last : out Ada.Streams.Stream_Element_Offset);

      -------------
      -- Further --
      -------------

      procedure Further (Item : in Stream_Element_Array) is

         procedure Compare (Item : in Stream_Element_Array);

         -------------
         -- Compare --
         -------------

         procedure Compare (Item : in Stream_Element_Array) is
            Next_First : Stream_Element_Offset := Compare_First + Item'Length;
         begin
            if Buffer (Compare_First .. Next_First - 1) /= Item then
               raise Program_Error;
            end if;

            Compare_First := Next_First;
         end Compare;

         procedure Compare_Write is new ZLib.Write (Write => Compare);
      begin
         Compare_Write (Inflate, Item, No_Flush);
      end Further;

      -----------------
      -- Read_Buffer --
      -----------------

      procedure Read_Buffer
        (Item : out Ada.Streams.Stream_Element_Array;
         Last : out Ada.Streams.Stream_Element_Offset)
      is
         Buff_Diff   : Stream_Element_Offset := Buffer'Last - Buffer_First;
         Next_First : Stream_Element_Offset;
      begin
         if Item'Length <= Buff_Diff then
            Last := Item'Last;

            Next_First := Buffer_First + Item'Length;

            Item := Buffer (Buffer_First .. Next_First - 1);

            Buffer_First := Next_First;
         else
            Last := Item'First + Buff_Diff;
            Item (Item'First .. Last) := Buffer (Buffer_First .. Buffer'Last);
            Buffer_First := Buffer'Last + 1;
         end if;
      end Read_Buffer;

      procedure Translate is new Generic_Translate
                                   (Data_In  => Read_Buffer,
                                    Data_Out => Further);

   begin
      Random_Elements.Reset (Gen);

      Buffer := (others => 20);

      Main : loop
         for J in Buffer'Range loop
            Buffer (J) := Random_Elements.Random (Gen);

            Deflate_Init (Deflate);
            Inflate_Init (Inflate);

            Buffer_First  := Buffer'First;
            Compare_First := Buffer'First;

            Translate (Deflate);

            if Compare_First /= Buffer'Last + 1 then
               raise Program_Error;
            end if;

            Ada.Text_IO.Put_Line
              (Ada.Task_Identification.Image
                 (Ada.Task_Identification.Current_Task)
               & Stream_Element_Offset'Image (J)
               & ZLib.Count'Image (Total_Out (Deflate)));

            Close (Deflate);
            Close (Inflate);

            exit Main when Stop;
         end loop;
      end loop Main;
   exception
      when E : others =>
         Ada.Text_IO.Put_Line (Ada.Exceptions.Exception_Information (E));
         Stop := True;
   end Test_Task;

   Test : array (1 .. 4) of Test_Task;

   pragma Unreferenced (Test);

   Dummy : Character;

begin
   Ada.Text_IO.Get_Immediate (Dummy);
   Stop := True;
end MTest;

----------------------------------------------------------------
--  ZLib for Ada thick binding.                               --
--                                                            --
--  Copyright (C) 2002-2003 Dmitriy Anisimkov                 --
--                                                            --
--  Open source license information is in the zlib.ads file.  --
----------------------------------------------------------------

--  $Id: read.adb,v 1.8 2004/05/31 10:53:40 vagul Exp $

--  Test/demo program for the generic read interface.

with Ada.Numerics.Discrete_Random;
with Ada.Streams;
with Ada.Text_IO;

with ZLib;

procedure Read is

   use Ada.Streams;

   ------------------------------------
   --  Test configuration parameters --
   ------------------------------------

   File_Size   : Stream_Element_Offset := 100_000;

   Continuous  : constant Boolean          := False;
   --  If this constant is True, the test would be repeated again and again,
   --  with increment File_Size for every iteration.

   Header      : constant ZLib.Header_Type := ZLib.Default;
   --  Do not use Header other than Default in ZLib versions 1.1.4 and older.

   Init_Random : constant := 8;
   --  We are using the same random sequence, in case of we catch bug,
   --  so we would be able to reproduce it.

   -- End --

   Pack_Size : Stream_Element_Offset;
   Offset    : Stream_Element_Offset;

   Filter     : ZLib.Filter_Type;

   subtype Visible_Symbols
      is Stream_Element range 16#20# .. 16#7E#;

   package Random_Elements is new
      Ada.Numerics.Discrete_Random (Visible_Symbols);

   Gen : Random_Elements.Generator;
   Period  : constant Stream_Element_Offset := 200;
   --  Period constant variable for random generator not to be very random.
   --  Bigger period, harder random.

   Read_Buffer : Stream_Element_Array (1 .. 2048);
   Read_First  : Stream_Element_Offset;
   Read_Last   : Stream_Element_Offset;

   procedure Reset;

   procedure Read
     (Item : out Stream_Element_Array;
      Last : out Stream_Element_Offset);
   --  this procedure is for generic instantiation of
   --  ZLib.Read
   --  reading data from the File_In.

   procedure Read is new ZLib.Read
                           (Read,
                            Read_Buffer,
                            Rest_First => Read_First,
                            Rest_Last  => Read_Last);

   ----------
   -- Read --
   ----------

   procedure Read
     (Item : out Stream_Element_Array;
      Last : out Stream_Element_Offset) is
   begin
      Last := Stream_Element_Offset'Min
               (Item'Last,
                Item'First + File_Size - Offset);

      for J in Item'First .. Last loop
         if J < Item'First + Period then
            Item (J) := Random_Elements.Random (Gen);
         else
            Item (J) := Item (J - Period);
         end if;

         Offset   := Offset + 1;
      end loop;
   end Read;

   -----------
   -- Reset --
   -----------

   procedure Reset is
   begin
      Random_Elements.Reset (Gen, Init_Random);
      Pack_Size := 0;
      Offset := 1;
      Read_First := Read_Buffer'Last + 1;
      Read_Last  := Read_Buffer'Last;
   end Reset;

begin
   Ada.Text_IO.Put_Line ("ZLib " & ZLib.Version);

   loop
      for Level in ZLib.Compression_Level'Range loop

         Ada.Text_IO.Put ("Level ="
            & ZLib.Compression_Level'Image (Level));

         --  Deflate using generic instantiation.

         ZLib.Deflate_Init
               (Filter,
                Level,
                Header => Header);

         Reset;

         Ada.Text_IO.Put
           (Stream_Element_Offset'Image (File_Size) & " ->");

         loop
            declare
               Buffer : Stream_Element_Array (1 .. 1024);
               Last   : Stream_Element_Offset;
            begin
               Read (Filter, Buffer, Last);

               Pack_Size := Pack_Size + Last - Buffer'First + 1;

               exit when Last < Buffer'Last;
            end;
         end loop;

         Ada.Text_IO.Put_Line (Stream_Element_Offset'Image (Pack_Size));

         ZLib.Close (Filter);
      end loop;

      exit when not Continuous;

      File_Size := File_Size + 1;
   end loop;
end Read;

                        ZLib for Ada thick binding (ZLib.Ada)
                        Release 1.3

ZLib.Ada is a thick binding interface to the popular ZLib data
compression library, available at http://www.gzip.org/zlib/.
It provides Ada-style access to the ZLib C library.


        Here are the main changes since ZLib.Ada 1.2:

- Attension: ZLib.Read generic routine have a initialization requirement
  for Read_Last parameter now. It is a bit incompartible with previous version,
  but extends functionality, we could use new parameters Allow_Read_Some and
  Flush now.

- Added Is_Open routines to ZLib and ZLib.Streams packages.

- Add pragma Assert to check Stream_Element is 8 bit.

- Fix extraction to buffer with exact known decompressed size. Error reported by
  Steve Sangwine.

- Fix definition of ULong (changed to unsigned_long), fix regression on 64 bits
  computers. Patch provided by Pascal Obry.

- Add Status_Error exception definition.

- Add pragma Assertion that Ada.Streams.Stream_Element size is 8 bit.


        How to build ZLib.Ada under GNAT

You should have the ZLib library already build on your computer, before
building ZLib.Ada. Make the directory of ZLib.Ada sources current and
issue the command:

  gnatmake test -largs -L<directory where libz.a is> -lz

Or use the GNAT project file build for GNAT 3.15 or later:

  gnatmake -Pzlib.gpr -L<directory where libz.a is>


        How to build ZLib.Ada under Aonix ObjectAda for Win32 7.2.2

1. Make a project with all *.ads and *.adb files from the distribution.
2. Build the libz.a library from the ZLib C sources.
3. Rename libz.a to z.lib.
4. Add the library z.lib to the project.
5. Add the libc.lib library from the ObjectAda distribution to the project.
6. Build the executable using test.adb as a main procedure.


        How to use ZLib.Ada

The source files test.adb and read.adb are small demo programs that show
the main functionality of ZLib.Ada.

The routines from the package specifications are commented.


Homepage: http://zlib-ada.sourceforge.net/
Author: Dmitriy Anisimkov <anisimkov@yahoo.com>

Contributors: Pascal Obry <pascal@obry.org>, Steve Sangwine <sjs@essex.ac.uk>

----------------------------------------------------------------
--  ZLib for Ada thick binding.                               --
--                                                            --
--  Copyright (C) 2002-2003 Dmitriy Anisimkov                 --
--                                                            --
--  Open source license information is in the zlib.ads file.  --
----------------------------------------------------------------

--  $Id: test.adb,v 1.17 2003/08/12 12:13:30 vagul Exp $

--  The program has a few aims.
--  1. Test ZLib.Ada95 thick binding functionality.
--  2. Show the example of use main functionality of the ZLib.Ada95 binding.
--  3. Build this program automatically compile all ZLib.Ada95 packages under
--     GNAT Ada95 compiler.

with ZLib.Streams;
with Ada.Streams.Stream_IO;
with Ada.Numerics.Discrete_Random;

with Ada.Text_IO;

with Ada.Calendar;

procedure Test is

   use Ada.Streams;
   use Stream_IO;

   ------------------------------------
   --  Test configuration parameters --
   ------------------------------------

   File_Size   : Count   := 100_000;
   Continuous  : constant Boolean := False;

   Header      : constant ZLib.Header_Type := ZLib.Default;
                                              --  ZLib.None;
                                              --  ZLib.Auto;
                                              --  ZLib.GZip;
   --  Do not use Header other then Default in ZLib versions 1.1.4
   --  and older.

   Strategy    : constant ZLib.Strategy_Type := ZLib.Default_Strategy;
   Init_Random : constant := 10;

   -- End --

   In_File_Name  : constant String := "testzlib.in";
   --  Name of the input file

   Z_File_Name   : constant String := "testzlib.zlb";
   --  Name of the compressed file.

   Out_File_Name : constant String := "testzlib.out";
   --  Name of the decompressed file.

   File_In   : File_Type;
   File_Out  : File_Type;
   File_Back : File_Type;
   File_Z    : ZLib.Streams.Stream_Type;

   Filter : ZLib.Filter_Type;

   Time_Stamp : Ada.Calendar.Time;

   procedure Generate_File;
   --  Generate file of spetsified size with some random data.
   --  The random data is repeatable, for the good compression.

   procedure Compare_Streams
     (Left, Right : in out Root_Stream_Type'Class);
   --  The procedure compearing data in 2 streams.
   --  It is for compare data before and after compression/decompression.

   procedure Compare_Files (Left, Right : String);
   --  Compare files. Based on the Compare_Streams.

   procedure Copy_Streams
     (Source, Target : in out Root_Stream_Type'Class;
      Buffer_Size    : in     Stream_Element_Offset := 1024);
   --  Copying data from one stream to another. It is for test stream
   --  interface of the library.

   procedure Data_In
     (Item : out Stream_Element_Array;
      Last : out Stream_Element_Offset);
   --  this procedure is for generic instantiation of
   --  ZLib.Generic_Translate.
   --  reading data from the File_In.

   procedure Data_Out (Item : in Stream_Element_Array);
   --  this procedure is for generic instantiation of
   --  ZLib.Generic_Translate.
   --  writing data to the File_Out.

   procedure Stamp;
   --  Store the timestamp to the local variable.

   procedure Print_Statistic (Msg : String; Data_Size : ZLib.Count);
   --  Print the time statistic with the message.

   procedure Translate is new ZLib.Generic_Translate
                                (Data_In  => Data_In,
                                 Data_Out => Data_Out);
   --  This procedure is moving data from File_In to File_Out
   --  with compression or decompression, depend on initialization of
   --  Filter parameter.

   -------------------
   -- Compare_Files --
   -------------------

   procedure Compare_Files (Left, Right : String) is
      Left_File, Right_File : File_Type;
   begin
      Open (Left_File, In_File, Left);
      Open (Right_File, In_File, Right);
      Compare_Streams (Stream (Left_File).all, Stream (Right_File).all);
      Close (Left_File);
      Close (Right_File);
   end Compare_Files;

   ---------------------
   -- Compare_Streams --
   ---------------------

   procedure Compare_Streams
     (Left, Right : in out Ada.Streams.Root_Stream_Type'Class)
   is
      Left_Buffer, Right_Buffer : Stream_Element_Array (0 .. 16#FFF#);
      Left_Last, Right_Last : Stream_Element_Offset;
   begin
      loop
         Read (Left, Left_Buffer, Left_Last);
         Read (Right, Right_Buffer, Right_Last);

         if Left_Last /= Right_Last then
            Ada.Text_IO.Put_Line ("Compare error :"
              & Stream_Element_Offset'Image (Left_Last)
              & " /= "
              & Stream_Element_Offset'Image (Right_Last));

            raise Constraint_Error;

         elsif Left_Buffer (0 .. Left_Last)
               /= Right_Buffer (0 .. Right_Last)
         then
            Ada.Text_IO.Put_Line ("ERROR: IN and OUT files is not equal.");
            raise Constraint_Error;

         end if;

         exit when Left_Last < Left_Buffer'Last;
      end loop;
   end Compare_Streams;

   ------------------
   -- Copy_Streams --
   ------------------

   procedure Copy_Streams
     (Source, Target : in out Ada.Streams.Root_Stream_Type'Class;
      Buffer_Size    : in     Stream_Element_Offset := 1024)
   is
      Buffer : Stream_Element_Array (1 .. Buffer_Size);
      Last   : Stream_Element_Offset;
   begin
      loop
         Read  (Source, Buffer, Last);
         Write (Target, Buffer (1 .. Last));

         exit when Last < Buffer'Last;
      end loop;
   end Copy_Streams;

   -------------
   -- Data_In --
   -------------

   procedure Data_In
     (Item : out Stream_Element_Array;
      Last : out Stream_Element_Offset) is
   begin
      Read (File_In, Item, Last);
   end Data_In;

   --------------
   -- Data_Out --
   --------------

   procedure Data_Out (Item : in Stream_Element_Array) is
   begin
      Write (File_Out, Item);
   end Data_Out;

   -------------------
   -- Generate_File --
   -------------------

   procedure Generate_File is
      subtype Visible_Symbols is Stream_Element range 16#20# .. 16#7E#;

      package Random_Elements is
         new Ada.Numerics.Discrete_Random (Visible_Symbols);

      Gen    : Random_Elements.Generator;
      Buffer : Stream_Element_Array := (1 .. 77 => 16#20#) & 10;

      Buffer_Count : constant Count := File_Size / Buffer'Length;
      --  Number of same buffers in the packet.

      Density : constant Count := 30; --  from 0 to Buffer'Length - 2;

      procedure Fill_Buffer (J, D : in Count);
      --  Change the part of the buffer.

      -----------------
      -- Fill_Buffer --
      -----------------

      procedure Fill_Buffer (J, D : in Count) is
      begin
         for K in 0 .. D loop
            Buffer
              (Stream_Element_Offset ((J + K) mod (Buffer'Length - 1) + 1))
             := Random_Elements.Random (Gen);

         end loop;
      end Fill_Buffer;

   begin
      Random_Elements.Reset (Gen, Init_Random);

      Create (File_In, Out_File, In_File_Name);

      Fill_Buffer (1, Buffer'Length - 2);

      for J in 1 .. Buffer_Count loop
         Write (File_In, Buffer);

         Fill_Buffer (J, Density);
      end loop;

      --  fill remain size.

      Write
        (File_In,
         Buffer
           (1 .. Stream_Element_Offset
                   (File_Size - Buffer'Length * Buffer_Count)));

      Flush (File_In);
      Close (File_In);
   end Generate_File;

   ---------------------
   -- Print_Statistic --
   ---------------------

   procedure Print_Statistic (Msg : String; Data_Size : ZLib.Count) is
      use Ada.Calendar;
      use Ada.Text_IO;

      package Count_IO is new Integer_IO (ZLib.Count);

      Curr_Dur : Duration := Clock - Time_Stamp;
   begin
      Put (Msg);

      Set_Col (20);
      Ada.Text_IO.Put ("size =");

      Count_IO.Put
        (Data_Size,
         Width => Stream_IO.Count'Image (File_Size)'Length);

      Put_Line (" duration =" & Duration'Image (Curr_Dur));
   end Print_Statistic;

   -----------
   -- Stamp --
   -----------

   procedure Stamp is
   begin
      Time_Stamp := Ada.Calendar.Clock;
   end Stamp;

begin
   Ada.Text_IO.Put_Line ("ZLib " & ZLib.Version);

   loop
      Generate_File;

      for Level in ZLib.Compression_Level'Range loop

         Ada.Text_IO.Put_Line ("Level ="
            & ZLib.Compression_Level'Image (Level));

         --  Test generic interface.
         Open   (File_In, In_File, In_File_Name);
         Create (File_Out, Out_File, Z_File_Name);

         Stamp;

         --  Deflate using generic instantiation.

         ZLib.Deflate_Init
               (Filter   => Filter,
                Level    => Level,
                Strategy => Strategy,
                Header   => Header);

         Translate (Filter);
         Print_Statistic ("Generic compress", ZLib.Total_Out (Filter));
         ZLib.Close (Filter);

         Close (File_In);
         Close (File_Out);

         Open   (File_In, In_File, Z_File_Name);
         Create (File_Out, Out_File, Out_File_Name);

         Stamp;

         --  Inflate using generic instantiation.

         ZLib.Inflate_Init (Filter, Header => Header);

         Translate (Filter);
         Print_Statistic ("Generic decompress", ZLib.Total_Out (Filter));

         ZLib.Close (Filter);

         Close (File_In);
         Close (File_Out);

         Compare_Files (In_File_Name, Out_File_Name);

         --  Test stream interface.

         --  Compress to the back stream.

         Open   (File_In, In_File, In_File_Name);
         Create (File_Back, Out_File, Z_File_Name);

         Stamp;

         ZLib.Streams.Create
           (Stream          => File_Z,
            Mode            => ZLib.Streams.Out_Stream,
            Back            => ZLib.Streams.Stream_Access
                                 (Stream (File_Back)),
            Back_Compressed => True,
            Level           => Level,
            Strategy        => Strategy,
            Header          => Header);

         Copy_Streams
           (Source => Stream (File_In).all,
            Target => File_Z);

         --  Flushing internal buffers to the back stream.

         ZLib.Streams.Flush (File_Z, ZLib.Finish);

         Print_Statistic ("Write compress",
                          ZLib.Streams.Write_Total_Out (File_Z));

         ZLib.Streams.Close (File_Z);

         Close (File_In);
         Close (File_Back);

         --  Compare reading from original file and from
         --  decompression stream.

         Open (File_In,   In_File, In_File_Name);
         Open (File_Back, In_File, Z_File_Name);

         ZLib.Streams.Create
           (Stream          => File_Z,
            Mode            => ZLib.Streams.In_Stream,
            Back            => ZLib.Streams.Stream_Access
                                 (Stream (File_Back)),
            Back_Compressed => True,
            Header          => Header);

         Stamp;
         Compare_Streams (Stream (File_In).all, File_Z);

         Print_Statistic ("Read decompress",
                          ZLib.Streams.Read_Total_Out (File_Z));

         ZLib.Streams.Close (File_Z);
         Close (File_In);
         Close (File_Back);

         --  Compress by reading from compression stream.

         Open (File_Back, In_File, In_File_Name);
         Create (File_Out, Out_File, Z_File_Name);

         ZLib.Streams.Create
           (Stream          => File_Z,
            Mode            => ZLib.Streams.In_Stream,
            Back            => ZLib.Streams.Stream_Access
                                 (Stream (File_Back)),
            Back_Compressed => False,
            Level           => Level,
            Strategy        => Strategy,
            Header          => Header);

         Stamp;
         Copy_Streams
           (Source => File_Z,
            Target => Stream (File_Out).all);

         Print_Statistic ("Read compress",
                          ZLib.Streams.Read_Total_Out (File_Z));

         ZLib.Streams.Close (File_Z);

         Close (File_Out);
         Close (File_Back);

         --  Decompress to decompression stream.

         Open   (File_In,   In_File, Z_File_Name);
         Create (File_Back, Out_File, Out_File_Name);

         ZLib.Streams.Create
           (Stream          => File_Z,
            Mode            => ZLib.Streams.Out_Stream,
            Back            => ZLib.Streams.Stream_Access
                                 (Stream (File_Back)),
            Back_Compressed => False,
            Header          => Header);

         Stamp;

         Copy_Streams
           (Source => Stream (File_In).all,
            Target => File_Z);

         Print_Statistic ("Write decompress",
                          ZLib.Streams.Write_Total_Out (File_Z));

         ZLib.Streams.Close (File_Z);
         Close (File_In);
         Close (File_Back);

         Compare_Files (In_File_Name, Out_File_Name);
      end loop;

      Ada.Text_IO.Put_Line (Count'Image (File_Size) & " Ok.");

      exit when not Continuous;

      File_Size := File_Size + 1;
   end loop;
end Test;

----------------------------------------------------------------
--  ZLib for Ada thick binding.                               --
--                                                            --
--  Copyright (C) 2002-2003 Dmitriy Anisimkov                 --
--                                                            --
--  Open source license information is in the zlib.ads file.  --
----------------------------------------------------------------

--  $Id: zlib-streams.adb,v 1.10 2004/05/31 10:53:40 vagul Exp $

with Ada.Unchecked_Deallocation;

package body ZLib.Streams is

   -----------
   -- Close --
   -----------

   procedure Close (Stream : in out Stream_Type) is
      procedure Free is new Ada.Unchecked_Deallocation
         (Stream_Element_Array, Buffer_Access);
   begin
      if Stream.Mode = Out_Stream or Stream.Mode = Duplex then
         --  We should flush the data written by the writer.

         Flush (Stream, Finish);

         Close (Stream.Writer);
      end if;

      if Stream.Mode = In_Stream or Stream.Mode = Duplex then
         Close (Stream.Reader);
         Free (Stream.Buffer);
      end if;
   end Close;

   ------------
   -- Create --
   ------------

   procedure Create
     (Stream            :    out Stream_Type;
      Mode              : in     Stream_Mode;
      Back              : in     Stream_Access;
      Back_Compressed   : in     Boolean;
      Level             : in     Compression_Level := Default_Compression;
      Strategy          : in     Strategy_Type     := Default_Strategy;
      Header            : in     Header_Type       := Default;
      Read_Buffer_Size  : in     Ada.Streams.Stream_Element_Offset
                                    := Default_Buffer_Size;
      Write_Buffer_Size : in     Ada.Streams.Stream_Element_Offset
                                    := Default_Buffer_Size)
   is

      subtype Buffer_Subtype is Stream_Element_Array (1 .. Read_Buffer_Size);

      procedure Init_Filter
         (Filter   : in out Filter_Type;
          Compress : in     Boolean);

      -----------------
      -- Init_Filter --
      -----------------

      procedure Init_Filter
         (Filter   : in out Filter_Type;
          Compress : in     Boolean) is
      begin
         if Compress then
            Deflate_Init
              (Filter, Level, Strategy, Header => Header);
         else
            Inflate_Init (Filter, Header => Header);
         end if;
      end Init_Filter;

   begin
      Stream.Back := Back;
      Stream.Mode := Mode;

      if Mode = Out_Stream or Mode = Duplex then
         Init_Filter (Stream.Writer, Back_Compressed);
         Stream.Buffer_Size := Write_Buffer_Size;
      else
         Stream.Buffer_Size := 0;
      end if;

      if Mode = In_Stream or Mode = Duplex then
         Init_Filter (Stream.Reader, not Back_Compressed);

         Stream.Buffer     := new Buffer_Subtype;
         Stream.Rest_First := Stream.Buffer'Last + 1;
         Stream.Rest_Last  := Stream.Buffer'Last;
      end if;
   end Create;

   -----------
   -- Flush --
   -----------

   procedure Flush
     (Stream : in out Stream_Type;
      Mode   : in     Flush_Mode := Sync_Flush)
   is
      Buffer : Stream_Element_Array (1 .. Stream.Buffer_Size);
      Last   : Stream_Element_Offset;
   begin
      loop
         Flush (Stream.Writer, Buffer, Last, Mode);

         Ada.Streams.Write (Stream.Back.all, Buffer (1 .. Last));

         exit when Last < Buffer'Last;
      end loop;
   end Flush;

   -------------
   -- Is_Open --
   -------------

   function Is_Open (Stream : Stream_Type) return Boolean is
   begin
      return Is_Open (Stream.Reader) or else Is_Open (Stream.Writer);
   end Is_Open;

   ----------
   -- Read --
   ----------

   procedure Read
     (Stream : in out Stream_Type;
      Item   :    out Stream_Element_Array;
      Last   :    out Stream_Element_Offset)
   is

      procedure Read
        (Item : out Stream_Element_Array;
         Last : out Stream_Element_Offset);

      ----------
      -- Read --
      ----------

      procedure Read
        (Item : out Stream_Element_Array;
         Last : out Stream_Element_Offset) is
      begin
         Ada.Streams.Read (Stream.Back.all, Item, Last);
      end Read;

      procedure Read is new ZLib.Read
         (Read       => Read,
          Buffer     => Stream.Buffer.all,
          Rest_First => Stream.Rest_First,
          Rest_Last  => Stream.Rest_Last);

   begin
      Read (Stream.Reader, Item, Last);
   end Read;

   -------------------
   -- Read_Total_In --
   -------------------

   function Read_Total_In (Stream : in Stream_Type) return Count is
   begin
      return Total_In (Stream.Reader);
   end Read_Total_In;

   --------------------
   -- Read_Total_Out --
   --------------------

   function Read_Total_Out (Stream : in Stream_Type) return Count is
   begin
      return Total_Out (Stream.Reader);
   end Read_Total_Out;

   -----------
   -- Write --
   -----------

   procedure Write
     (Stream : in out Stream_Type;
      Item   : in     Stream_Element_Array)
   is

      procedure Write (Item : in Stream_Element_Array);

      -----------
      -- Write --
      -----------

      procedure Write (Item : in Stream_Element_Array) is
      begin
         Ada.Streams.Write (Stream.Back.all, Item);
      end Write;

      procedure Write is new ZLib.Write
         (Write       => Write,
          Buffer_Size => Stream.Buffer_Size);

   begin
      Write (Stream.Writer, Item, No_Flush);
   end Write;

   --------------------
   -- Write_Total_In --
   --------------------

   function Write_Total_In (Stream : in Stream_Type) return Count is
   begin
      return Total_In (Stream.Writer);
   end Write_Total_In;

   ---------------------
   -- Write_Total_Out --
   ---------------------

   function Write_Total_Out (Stream : in Stream_Type) return Count is
   begin
      return Total_Out (Stream.Writer);
   end Write_Total_Out;

end ZLib.Streams;

----------------------------------------------------------------
--  ZLib for Ada thick binding.                               --
--                                                            --
--  Copyright (C) 2002-2003 Dmitriy Anisimkov                 --
--                                                            --
--  Open source license information is in the zlib.ads file.  --
----------------------------------------------------------------

--  $Id: zlib-streams.ads,v 1.12 2004/05/31 10:53:40 vagul Exp $

package ZLib.Streams is

   type Stream_Mode is (In_Stream, Out_Stream, Duplex);

   type Stream_Access is access all Ada.Streams.Root_Stream_Type'Class;

   type Stream_Type is
      new Ada.Streams.Root_Stream_Type with private;

   procedure Read
     (Stream : in out Stream_Type;
      Item   :    out Ada.Streams.Stream_Element_Array;
      Last   :    out Ada.Streams.Stream_Element_Offset);

   procedure Write
     (Stream : in out Stream_Type;
      Item   : in     Ada.Streams.Stream_Element_Array);

   procedure Flush
     (Stream : in out Stream_Type;
      Mode   : in     Flush_Mode := Sync_Flush);
   --  Flush the written data to the back stream,
   --  all data placed to the compressor is flushing to the Back stream.
   --  Should not be used until necessary, because it is decreasing
   --  compression.

   function Read_Total_In (Stream : in Stream_Type) return Count;
   pragma Inline (Read_Total_In);
   --  Return total number of bytes read from back stream so far.

   function Read_Total_Out (Stream : in Stream_Type) return Count;
   pragma Inline (Read_Total_Out);
   --  Return total number of bytes read so far.

   function Write_Total_In (Stream : in Stream_Type) return Count;
   pragma Inline (Write_Total_In);
   --  Return total number of bytes written so far.

   function Write_Total_Out (Stream : in Stream_Type) return Count;
   pragma Inline (Write_Total_Out);
   --  Return total number of bytes written to the back stream.

   procedure Create
     (Stream            :    out Stream_Type;
      Mode              : in     Stream_Mode;
      Back              : in     Stream_Access;
      Back_Compressed   : in     Boolean;
      Level             : in     Compression_Level := Default_Compression;
      Strategy          : in     Strategy_Type     := Default_Strategy;
      Header            : in     Header_Type       := Default;
      Read_Buffer_Size  : in     Ada.Streams.Stream_Element_Offset
                                    := Default_Buffer_Size;
      Write_Buffer_Size : in     Ada.Streams.Stream_Element_Offset
                                    := Default_Buffer_Size);
   --  Create the Comression/Decompression stream.
   --  If mode is In_Stream then Write operation is disabled.
   --  If mode is Out_Stream then Read operation is disabled.

   --  If Back_Compressed is true then
   --  Data written to the Stream is compressing to the Back stream
   --  and data read from the Stream is decompressed data from the Back stream.

   --  If Back_Compressed is false then
   --  Data written to the Stream is decompressing to the Back stream
   --  and data read from the Stream is compressed data from the Back stream.

   --  !!! When the Need_Header is False ZLib-Ada is using undocumented
   --  ZLib 1.1.4 functionality to do not create/wait for ZLib headers.

   function Is_Open (Stream : Stream_Type) return Boolean;

   procedure Close (Stream : in out Stream_Type);

private

   use Ada.Streams;

   type Buffer_Access is access all Stream_Element_Array;

   type Stream_Type
     is new Root_Stream_Type with
   record
      Mode       : Stream_Mode;

      Buffer     : Buffer_Access;
      Rest_First : Stream_Element_Offset;
      Rest_Last  : Stream_Element_Offset;
      --  Buffer for Read operation.
      --  We need to have this buffer in the record
      --  because not all read data from back stream
      --  could be processed during the read operation.

      Buffer_Size : Stream_Element_Offset;
      --  Buffer size for write operation.
      --  We do not need to have this buffer
      --  in the record because all data could be
      --  processed in the write operation.

      Back       : Stream_Access;
      Reader     : Filter_Type;
      Writer     : Filter_Type;
   end record;

end ZLib.Streams;

----------------------------------------------------------------
--  ZLib for Ada thick binding.                               --
--                                                            --
--  Copyright (C) 2002-2003 Dmitriy Anisimkov                 --
--                                                            --
--  Open source license information is in the zlib.ads file.  --
----------------------------------------------------------------

--  $Id: zlib-thin.adb,v 1.8 2003/12/14 18:27:31 vagul Exp $

package body ZLib.Thin is

   ZLIB_VERSION  : constant Chars_Ptr := zlibVersion;

   Z_Stream_Size : constant Int := Z_Stream'Size / System.Storage_Unit;

   --------------
   -- Avail_In --
   --------------

   function Avail_In (Strm : in Z_Stream) return UInt is
   begin
      return Strm.Avail_In;
   end Avail_In;

   ---------------
   -- Avail_Out --
   ---------------

   function Avail_Out (Strm : in Z_Stream) return UInt is
   begin
      return Strm.Avail_Out;
   end Avail_Out;

   ------------------
   -- Deflate_Init --
   ------------------

   function Deflate_Init
     (strm       : Z_Streamp;
      level      : Int;
      method     : Int;
      windowBits : Int;
      memLevel   : Int;
      strategy   : Int)
      return       Int is
   begin
      return deflateInit2
               (strm,
                level,
                method,
                windowBits,
                memLevel,
                strategy,
                ZLIB_VERSION,
                Z_Stream_Size);
   end Deflate_Init;

   ------------------
   -- Inflate_Init --
   ------------------

   function Inflate_Init (strm : Z_Streamp; windowBits : Int) return Int is
   begin
      return inflateInit2 (strm, windowBits, ZLIB_VERSION, Z_Stream_Size);
   end Inflate_Init;

   ------------------------
   -- Last_Error_Message --
   ------------------------

   function Last_Error_Message (Strm : in Z_Stream) return String is
      use Interfaces.C.Strings;
   begin
      if Strm.msg = Null_Ptr then
         return "";
      else
         return Value (Strm.msg);
      end if;
   end Last_Error_Message;

   ------------
   -- Set_In --
   ------------

   procedure Set_In
     (Strm   : in out Z_Stream;
      Buffer : in     Voidp;
      Size   : in     UInt) is
   begin
      Strm.Next_In  := Buffer;
      Strm.Avail_In := Size;
   end Set_In;

   ------------------
   -- Set_Mem_Func --
   ------------------

   procedure Set_Mem_Func
     (Strm   : in out Z_Stream;
      Opaque : in     Voidp;
      Alloc  : in     alloc_func;
      Free   : in     free_func) is
   begin
      Strm.opaque := Opaque;
      Strm.zalloc := Alloc;
      Strm.zfree  := Free;
   end Set_Mem_Func;

   -------------
   -- Set_Out --
   -------------

   procedure Set_Out
     (Strm   : in out Z_Stream;
      Buffer : in     Voidp;
      Size   : in     UInt) is
   begin
      Strm.Next_Out  := Buffer;
      Strm.Avail_Out := Size;
   end Set_Out;

   --------------
   -- Total_In --
   --------------

   function Total_In (Strm : in Z_Stream) return ULong is
   begin
      return Strm.Total_In;
   end Total_In;

   ---------------
   -- Total_Out --
   ---------------

   function Total_Out (Strm : in Z_Stream) return ULong is
   begin
      return Strm.Total_Out;
   end Total_Out;

end ZLib.Thin;

----------------------------------------------------------------
--  ZLib for Ada thick binding.                               --
--                                                            --
--  Copyright (C) 2002-2003 Dmitriy Anisimkov                 --
--                                                            --
--  Open source license information is in the zlib.ads file.  --
----------------------------------------------------------------

--  $Id: zlib-thin.ads,v 1.11 2004/07/23 06:33:11 vagul Exp $

with Interfaces.C.Strings;

with System;

private package ZLib.Thin is

   --  From zconf.h

   MAX_MEM_LEVEL : constant := 9;         --  zconf.h:105
                                          --  zconf.h:105
   MAX_WBITS : constant := 15;      --  zconf.h:115
                                    --  32K LZ77 window
                                    --  zconf.h:115
   SEEK_SET : constant := 8#0000#;  --  zconf.h:244
                                    --  Seek from beginning of file.
                                    --  zconf.h:244
   SEEK_CUR : constant := 1;        --  zconf.h:245
                                    --  Seek from current position.
                                    --  zconf.h:245
   SEEK_END : constant := 2;        --  zconf.h:246
                                    --  Set file pointer to EOF plus "offset"
                                    --  zconf.h:246

   type Byte is new Interfaces.C.unsigned_char; --  8 bits
                                                --  zconf.h:214
   type UInt is new Interfaces.C.unsigned;      --  16 bits or more
                                                --  zconf.h:216
   type Int is new Interfaces.C.int;

   type ULong is new Interfaces.C.unsigned_long;     --  32 bits or more
                                                     --  zconf.h:217
   subtype Chars_Ptr is Interfaces.C.Strings.chars_ptr;

   type ULong_Access is access ULong;
   type Int_Access is access Int;

   subtype Voidp is System.Address;            --  zconf.h:232

   subtype Byte_Access is Voidp;

   Nul : constant Voidp := System.Null_Address;
   --  end from zconf

   Z_NO_FLUSH : constant := 8#0000#;   --  zlib.h:125
                                       --  zlib.h:125
   Z_PARTIAL_FLUSH : constant := 1;       --  zlib.h:126
                                          --  will be removed, use
                                          --  Z_SYNC_FLUSH instead
                                          --  zlib.h:126
   Z_SYNC_FLUSH : constant := 2;       --  zlib.h:127
                                       --  zlib.h:127
   Z_FULL_FLUSH : constant := 3;       --  zlib.h:128
                                       --  zlib.h:128
   Z_FINISH : constant := 4;        --  zlib.h:129
                                    --  zlib.h:129
   Z_OK : constant := 8#0000#;   --  zlib.h:132
                                 --  zlib.h:132
   Z_STREAM_END : constant := 1;       --  zlib.h:133
                                       --  zlib.h:133
   Z_NEED_DICT : constant := 2;        --  zlib.h:134
                                       --  zlib.h:134
   Z_ERRNO : constant := -1;        --  zlib.h:135
                                    --  zlib.h:135
   Z_STREAM_ERROR : constant := -2;       --  zlib.h:136
                                          --  zlib.h:136
   Z_DATA_ERROR : constant := -3;      --  zlib.h:137
                                       --  zlib.h:137
   Z_MEM_ERROR : constant := -4;       --  zlib.h:138
                                       --  zlib.h:138
   Z_BUF_ERROR : constant := -5;       --  zlib.h:139
                                       --  zlib.h:139
   Z_VERSION_ERROR : constant := -6;      --  zlib.h:140
                                          --  zlib.h:140
   Z_NO_COMPRESSION : constant := 8#0000#;   --  zlib.h:145
                                             --  zlib.h:145
   Z_BEST_SPEED : constant := 1;       --  zlib.h:146
                                       --  zlib.h:146
   Z_BEST_COMPRESSION : constant := 9;       --  zlib.h:147
                                             --  zlib.h:147
   Z_DEFAULT_COMPRESSION : constant := -1;      --  zlib.h:148
                                                --  zlib.h:148
   Z_FILTERED : constant := 1;      --  zlib.h:151
                                    --  zlib.h:151
   Z_HUFFMAN_ONLY : constant := 2;        --  zlib.h:152
                                          --  zlib.h:152
   Z_DEFAULT_STRATEGY : constant := 8#0000#; --  zlib.h:153
                                             --  zlib.h:153
   Z_BINARY : constant := 8#0000#;  --  zlib.h:156
                                    --  zlib.h:156
   Z_ASCII : constant := 1;      --  zlib.h:157
                                 --  zlib.h:157
   Z_UNKNOWN : constant := 2;       --  zlib.h:158
                                    --  zlib.h:158
   Z_DEFLATED : constant := 8;      --  zlib.h:161
                                    --  zlib.h:161
   Z_NULL : constant := 8#0000#; --  zlib.h:164
                                 --  for initializing zalloc, zfree, opaque
                                 --  zlib.h:164
   type gzFile is new Voidp;                  --  zlib.h:646

   type Z_Stream is private;

   type Z_Streamp is access all Z_Stream;     --  zlib.h:89

   type alloc_func is access function
     (Opaque : Voidp;
      Items  : UInt;
      Size   : UInt)
      return Voidp; --  zlib.h:63

   type free_func is access procedure (opaque : Voidp; address : Voidp);

   function zlibVersion return Chars_Ptr;

   function Deflate (strm : Z_Streamp; flush : Int) return Int;

   function DeflateEnd (strm : Z_Streamp) return Int;

   function Inflate (strm : Z_Streamp; flush : Int) return Int;

   function InflateEnd (strm : Z_Streamp) return Int;

   function deflateSetDictionary
     (strm       : Z_Streamp;
      dictionary : Byte_Access;
      dictLength : UInt)
      return       Int;

   function deflateCopy (dest : Z_Streamp; source : Z_Streamp) return Int;
   --  zlib.h:478

   function deflateReset (strm : Z_Streamp) return Int; -- zlib.h:495

   function deflateParams
     (strm     : Z_Streamp;
      level    : Int;
      strategy : Int)
      return     Int;       -- zlib.h:506

   function inflateSetDictionary
     (strm       : Z_Streamp;
      dictionary : Byte_Access;
      dictLength : UInt)
      return       Int; --  zlib.h:548

   function inflateSync (strm : Z_Streamp) return Int;  --  zlib.h:565

   function inflateReset (strm : Z_Streamp) return Int; --  zlib.h:580

   function compress
     (dest      : Byte_Access;
      destLen   : ULong_Access;
      source    : Byte_Access;
      sourceLen : ULong)
      return      Int;           -- zlib.h:601

   function compress2
     (dest      : Byte_Access;
      destLen   : ULong_Access;
      source    : Byte_Access;
      sourceLen : ULong;
      level     : Int)
      return      Int;          -- zlib.h:615

   function uncompress
     (dest      : Byte_Access;
      destLen   : ULong_Access;
      source    : Byte_Access;
      sourceLen : ULong)
      return      Int;

   function gzopen (path : Chars_Ptr; mode : Chars_Ptr) return gzFile;

   function gzdopen (fd : Int; mode : Chars_Ptr) return gzFile;

   function gzsetparams
     (file     : gzFile;
      level    : Int;
      strategy : Int)
      return     Int;

   function gzread
     (file : gzFile;
      buf  : Voidp;
      len  : UInt)
      return Int;

   function gzwrite
     (file : in gzFile;
      buf  : in Voidp;
      len  : in UInt)
      return Int;

   function gzprintf (file : in gzFile; format : in Chars_Ptr) return Int;

   function gzputs (file : in gzFile; s : in Chars_Ptr) return Int;

   function gzgets
     (file : gzFile;
      buf  : Chars_Ptr;
      len  : Int)
      return Chars_Ptr;

   function gzputc (file : gzFile; char : Int) return Int;

   function gzgetc (file : gzFile) return Int;

   function gzflush (file : gzFile; flush : Int) return Int;

   function gzseek
     (file   : gzFile;
      offset : Int;
      whence : Int)
      return   Int;

   function gzrewind (file : gzFile) return Int;

   function gztell (file : gzFile) return Int;

   function gzeof (file : gzFile) return Int;

   function gzclose (file : gzFile) return Int;

   function gzerror (file : gzFile; errnum : Int_Access) return Chars_Ptr;

   function adler32
     (adler : ULong;
      buf   : Byte_Access;
      len   : UInt)
      return  ULong;

   function crc32
     (crc  : ULong;
      buf  : Byte_Access;
      len  : UInt)
      return ULong;

   function deflateInit
     (strm        : Z_Streamp;
      level       : Int;
      version     : Chars_Ptr;
      stream_size : Int)
      return        Int;

   function deflateInit2
     (strm        : Z_Streamp;
      level       : Int;
      method      : Int;
      windowBits  : Int;
      memLevel    : Int;
      strategy    : Int;
      version     : Chars_Ptr;
      stream_size : Int)
      return        Int;

   function Deflate_Init
     (strm       : Z_Streamp;
      level      : Int;
      method     : Int;
      windowBits : Int;
      memLevel   : Int;
      strategy   : Int)
      return       Int;
   pragma Inline (Deflate_Init);

   function inflateInit
     (strm        : Z_Streamp;
      version     : Chars_Ptr;
      stream_size : Int)
      return        Int;

   function inflateInit2
     (strm        : in Z_Streamp;
      windowBits  : in Int;
      version     : in Chars_Ptr;
      stream_size : in Int)
      return      Int;

   function inflateBackInit
     (strm        : in Z_Streamp;
      windowBits  : in Int;
      window      : in Byte_Access;
      version     : in Chars_Ptr;
      stream_size : in Int)
      return      Int;
   --  Size of window have to be 2**windowBits.

   function Inflate_Init (strm : Z_Streamp; windowBits : Int) return Int;
   pragma Inline (Inflate_Init);

   function zError (err : Int) return Chars_Ptr;

   function inflateSyncPoint (z : Z_Streamp) return Int;

   function get_crc_table return ULong_Access;

   --  Interface to the available fields of the z_stream structure.
   --  The application must update next_in and avail_in when avail_in has
   --  dropped to zero. It must update next_out and avail_out when avail_out
   --  has dropped to zero. The application must initialize zalloc, zfree and
   --  opaque before calling the init function.

   procedure Set_In
     (Strm   : in out Z_Stream;
      Buffer : in Voidp;
      Size   : in UInt);
   pragma Inline (Set_In);

   procedure Set_Out
     (Strm   : in out Z_Stream;
      Buffer : in Voidp;
      Size   : in UInt);
   pragma Inline (Set_Out);

   procedure Set_Mem_Func
     (Strm   : in out Z_Stream;
      Opaque : in Voidp;
      Alloc  : in alloc_func;
      Free   : in free_func);
   pragma Inline (Set_Mem_Func);

   function Last_Error_Message (Strm : in Z_Stream) return String;
   pragma Inline (Last_Error_Message);

   function Avail_Out (Strm : in Z_Stream) return UInt;
   pragma Inline (Avail_Out);

   function Avail_In (Strm : in Z_Stream) return UInt;
   pragma Inline (Avail_In);

   function Total_In (Strm : in Z_Stream) return ULong;
   pragma Inline (Total_In);

   function Total_Out (Strm : in Z_Stream) return ULong;
   pragma Inline (Total_Out);

   function inflateCopy
     (dest   : in Z_Streamp;
      Source : in Z_Streamp)
      return Int;

   function compressBound (Source_Len : in ULong) return ULong;

   function deflateBound
     (Strm       : in Z_Streamp;
      Source_Len : in ULong)
      return     ULong;

   function gzungetc (C : in Int; File : in  gzFile) return Int;

   function zlibCompileFlags return ULong;

private

   type Z_Stream is record            -- zlib.h:68
      Next_In   : Voidp      := Nul;  -- next input byte
      Avail_In  : UInt       := 0;    -- number of bytes available at next_in
      Total_In  : ULong      := 0;    -- total nb of input bytes read so far
      Next_Out  : Voidp      := Nul;  -- next output byte should be put there
      Avail_Out : UInt       := 0;    -- remaining free space at next_out
      Total_Out : ULong      := 0;    -- total nb of bytes output so far
      msg       : Chars_Ptr;          -- last error message, NULL if no error
      state     : Voidp;              -- not visible by applications
      zalloc    : alloc_func := null; -- used to allocate the internal state
      zfree     : free_func  := null; -- used to free the internal state
      opaque    : Voidp;              -- private data object passed to
                                      --  zalloc and zfree
      data_type : Int;                -- best guess about the data type:
                                      --  ascii or binary
      adler     : ULong;              -- adler32 value of the uncompressed
                                      --  data
      reserved  : ULong;              -- reserved for future use
   end record;

   pragma Convention (C, Z_Stream);

   pragma Import (C, zlibVersion, "zlibVersion");
   pragma Import (C, Deflate, "deflate");
   pragma Import (C, DeflateEnd, "deflateEnd");
   pragma Import (C, Inflate, "inflate");
   pragma Import (C, InflateEnd, "inflateEnd");
   pragma Import (C, deflateSetDictionary, "deflateSetDictionary");
   pragma Import (C, deflateCopy, "deflateCopy");
   pragma Import (C, deflateReset, "deflateReset");
   pragma Import (C, deflateParams, "deflateParams");
   pragma Import (C, inflateSetDictionary, "inflateSetDictionary");
   pragma Import (C, inflateSync, "inflateSync");
   pragma Import (C, inflateReset, "inflateReset");
   pragma Import (C, compress, "compress");
   pragma Import (C, compress2, "compress2");
   pragma Import (C, uncompress, "uncompress");
   pragma Import (C, gzopen, "gzopen");
   pragma Import (C, gzdopen, "gzdopen");
   pragma Import (C, gzsetparams, "gzsetparams");
   pragma Import (C, gzread, "gzread");
   pragma Import (C, gzwrite, "gzwrite");
   pragma Import (C, gzprintf, "gzprintf");
   pragma Import (C, gzputs, "gzputs");
   pragma Import (C, gzgets, "gzgets");
   pragma Import (C, gzputc, "gzputc");
   pragma Import (C, gzgetc, "gzgetc");
   pragma Import (C, gzflush, "gzflush");
   pragma Import (C, gzseek, "gzseek");
   pragma Import (C, gzrewind, "gzrewind");
   pragma Import (C, gztell, "gztell");
   pragma Import (C, gzeof, "gzeof");
   pragma Import (C, gzclose, "gzclose");
   pragma Import (C, gzerror, "gzerror");
   pragma Import (C, adler32, "adler32");
   pragma Import (C, crc32, "crc32");
   pragma Import (C, deflateInit, "deflateInit_");
   pragma Import (C, inflateInit, "inflateInit_");
   pragma Import (C, deflateInit2, "deflateInit2_");
   pragma Import (C, inflateInit2, "inflateInit2_");
   pragma Import (C, zError, "zError");
   pragma Import (C, inflateSyncPoint, "inflateSyncPoint");
   pragma Import (C, get_crc_table, "get_crc_table");

   --  since zlib 1.2.0:

   pragma Import (C, inflateCopy, "inflateCopy");
   pragma Import (C, compressBound, "compressBound");
   pragma Import (C, deflateBound, "deflateBound");
   pragma Import (C, gzungetc, "gzungetc");
   pragma Import (C, zlibCompileFlags, "zlibCompileFlags");

   pragma Import (C, inflateBackInit, "inflateBackInit_");

   --  I stopped binding the inflateBack routines, because realize that
   --  it does not support zlib and gzip headers for now, and have no
   --  symmetric deflateBack routines.
   --  ZLib-Ada is symmetric regarding deflate/inflate data transformation
   --  and has a similar generic callback interface for the
   --  deflate/inflate transformation based on the regular Deflate/Inflate
   --  routines.

   --  pragma Import (C, inflateBack, "inflateBack");
   --  pragma Import (C, inflateBackEnd, "inflateBackEnd");

end ZLib.Thin;

----------------------------------------------------------------
--  ZLib for Ada thick binding.                               --
--                                                            --
--  Copyright (C) 2002-2004 Dmitriy Anisimkov                 --
--                                                            --
--  Open source license information is in the zlib.ads file.  --
----------------------------------------------------------------

--  $Id: zlib.adb,v 1.31 2004/09/06 06:53:19 vagul Exp $

with Ada.Exceptions;
with Ada.Unchecked_Conversion;
with Ada.Unchecked_Deallocation;

with Interfaces.C.Strings;

with ZLib.Thin;

package body ZLib is

   use type Thin.Int;

   type Z_Stream is new Thin.Z_Stream;

   type Return_Code_Enum is
      (OK,
       STREAM_END,
       NEED_DICT,
       ERRNO,
       STREAM_ERROR,
       DATA_ERROR,
       MEM_ERROR,
       BUF_ERROR,
       VERSION_ERROR);

   type Flate_Step_Function is access
     function (Strm : in Thin.Z_Streamp; Flush : in Thin.Int) return Thin.Int;
   pragma Convention (C, Flate_Step_Function);

   type Flate_End_Function is access
      function (Ctrm : in Thin.Z_Streamp) return Thin.Int;
   pragma Convention (C, Flate_End_Function);

   type Flate_Type is record
      Step : Flate_Step_Function;
      Done : Flate_End_Function;
   end record;

   subtype Footer_Array is Stream_Element_Array (1 .. 8);

   Simple_GZip_Header : constant Stream_Element_Array (1 .. 10)
     := (16#1f#, 16#8b#,                 --  Magic header
         16#08#,                         --  Z_DEFLATED
         16#00#,                         --  Flags
         16#00#, 16#00#, 16#00#, 16#00#, --  Time
         16#00#,                         --  XFlags
         16#03#                          --  OS code
        );
   --  The simplest gzip header is not for informational, but just for
   --  gzip format compatibility.
   --  Note that some code below is using assumption
   --  Simple_GZip_Header'Last > Footer_Array'Last, so do not make
   --  Simple_GZip_Header'Last <= Footer_Array'Last.

   Return_Code : constant array (Thin.Int range <>) of Return_Code_Enum
     := (0 => OK,
         1 => STREAM_END,
         2 => NEED_DICT,
        -1 => ERRNO,
        -2 => STREAM_ERROR,
        -3 => DATA_ERROR,
        -4 => MEM_ERROR,
        -5 => BUF_ERROR,
        -6 => VERSION_ERROR);

   Flate : constant array (Boolean) of Flate_Type
     := (True  => (Step => Thin.Deflate'Access,
                   Done => Thin.DeflateEnd'Access),
         False => (Step => Thin.Inflate'Access,
                   Done => Thin.InflateEnd'Access));

   Flush_Finish : constant array (Boolean) of Flush_Mode
     := (True => Finish, False => No_Flush);

   procedure Raise_Error (Stream : in Z_Stream);
   pragma Inline (Raise_Error);

   procedure Raise_Error (Message : in String);
   pragma Inline (Raise_Error);

   procedure Check_Error (Stream : in Z_Stream; Code : in Thin.Int);

   procedure Free is new Ada.Unchecked_Deallocation
      (Z_Stream, Z_Stream_Access);

   function To_Thin_Access is new Ada.Unchecked_Conversion
     (Z_Stream_Access, Thin.Z_Streamp);

   procedure Translate_GZip
     (Filter    : in out Filter_Type;
      In_Data   : in     Ada.Streams.Stream_Element_Array;
      In_Last   :    out Ada.Streams.Stream_Element_Offset;
      Out_Data  :    out Ada.Streams.Stream_Element_Array;
      Out_Last  :    out Ada.Streams.Stream_Element_Offset;
      Flush     : in     Flush_Mode);
   --  Separate translate routine for make gzip header.

   procedure Translate_Auto
     (Filter    : in out Filter_Type;
      In_Data   : in     Ada.Streams.Stream_Element_Array;
      In_Last   :    out Ada.Streams.Stream_Element_Offset;
      Out_Data  :    out Ada.Streams.Stream_Element_Array;
      Out_Last  :    out Ada.Streams.Stream_Element_Offset;
      Flush     : in     Flush_Mode);
   --  translate routine without additional headers.

   -----------------
   -- Check_Error --
   -----------------

   procedure Check_Error (Stream : in Z_Stream; Code : in Thin.Int) is
      use type Thin.Int;
   begin
      if Code /= Thin.Z_OK then
         Raise_Error
            (Return_Code_Enum'Image (Return_Code (Code))
              & ": " & Last_Error_Message (Stream));
      end if;
   end Check_Error;

   -----------
   -- Close --
   -----------

   procedure Close
     (Filter       : in out Filter_Type;
      Ignore_Error : in     Boolean := False)
   is
      Code : Thin.Int;
   begin
      if not Ignore_Error and then not Is_Open (Filter) then
         raise Status_Error;
      end if;

      Code := Flate (Filter.Compression).Done (To_Thin_Access (Filter.Strm));

      if Ignore_Error or else Code = Thin.Z_OK then
         Free (Filter.Strm);
      else
         declare
            Error_Message : constant String
              := Last_Error_Message (Filter.Strm.all);
         begin
            Free (Filter.Strm);
            Ada.Exceptions.Raise_Exception
               (ZLib_Error'Identity,
                Return_Code_Enum'Image (Return_Code (Code))
                  & ": " & Error_Message);
         end;
      end if;
   end Close;

   -----------
   -- CRC32 --
   -----------

   function CRC32
     (CRC  : in Unsigned_32;
      Data : in Ada.Streams.Stream_Element_Array)
      return Unsigned_32
   is
      use Thin;
   begin
      return Unsigned_32 (crc32 (ULong (CRC),
                                 Data'Address,
                                 Data'Length));
   end CRC32;

   procedure CRC32
     (CRC  : in out Unsigned_32;
      Data : in     Ada.Streams.Stream_Element_Array) is
   begin
      CRC := CRC32 (CRC, Data);
   end CRC32;

   ------------------
   -- Deflate_Init --
   ------------------

   procedure Deflate_Init
     (Filter       : in out Filter_Type;
      Level        : in     Compression_Level  := Default_Compression;
      Strategy     : in     Strategy_Type      := Default_Strategy;
      Method       : in     Compression_Method := Deflated;
      Window_Bits  : in     Window_Bits_Type   := Default_Window_Bits;
      Memory_Level : in     Memory_Level_Type  := Default_Memory_Level;
      Header       : in     Header_Type        := Default)
   is
      use type Thin.Int;
      Win_Bits : Thin.Int := Thin.Int (Window_Bits);
   begin
      if Is_Open (Filter) then
         raise Status_Error;
      end if;

      --  We allow ZLib to make header only in case of default header type.
      --  Otherwise we would either do header by ourselfs, or do not do
      --  header at all.

      if Header = None or else Header = GZip then
         Win_Bits := -Win_Bits;
      end if;

      --  For the GZip CRC calculation and make headers.

      if Header = GZip then
         Filter.CRC    := 0;
         Filter.Offset := Simple_GZip_Header'First;
      else
         Filter.Offset := Simple_GZip_Header'Last + 1;
      end if;

      Filter.Strm        := new Z_Stream;
      Filter.Compression := True;
      Filter.Stream_End  := False;
      Filter.Header      := Header;

      if Thin.Deflate_Init
           (To_Thin_Access (Filter.Strm),
            Level      => Thin.Int (Level),
            method     => Thin.Int (Method),
            windowBits => Win_Bits,
            memLevel   => Thin.Int (Memory_Level),
            strategy   => Thin.Int (Strategy)) /= Thin.Z_OK
      then
         Raise_Error (Filter.Strm.all);
      end if;
   end Deflate_Init;

   -----------
   -- Flush --
   -----------

   procedure Flush
     (Filter    : in out Filter_Type;
      Out_Data  :    out Ada.Streams.Stream_Element_Array;
      Out_Last  :    out Ada.Streams.Stream_Element_Offset;
      Flush     : in     Flush_Mode)
   is
      No_Data : Stream_Element_Array := (1 .. 0 => 0);
      Last    : Stream_Element_Offset;
   begin
      Translate (Filter, No_Data, Last, Out_Data, Out_Last, Flush);
   end Flush;

   -----------------------
   -- Generic_Translate --
   -----------------------

   procedure Generic_Translate
     (Filter          : in out ZLib.Filter_Type;
      In_Buffer_Size  : in     Integer := Default_Buffer_Size;
      Out_Buffer_Size : in     Integer := Default_Buffer_Size)
   is
      In_Buffer  : Stream_Element_Array
                     (1 .. Stream_Element_Offset (In_Buffer_Size));
      Out_Buffer : Stream_Element_Array
                     (1 .. Stream_Element_Offset (Out_Buffer_Size));
      Last       : Stream_Element_Offset;
      In_Last    : Stream_Element_Offset;
      In_First   : Stream_Element_Offset;
      Out_Last   : Stream_Element_Offset;
   begin
      Main : loop
         Data_In (In_Buffer, Last);

         In_First := In_Buffer'First;

         loop
            Translate
              (Filter   => Filter,
               In_Data  => In_Buffer (In_First .. Last),
               In_Last  => In_Last,
               Out_Data => Out_Buffer,
               Out_Last => Out_Last,
               Flush    => Flush_Finish (Last < In_Buffer'First));

            if Out_Buffer'First <= Out_Last then
               Data_Out (Out_Buffer (Out_Buffer'First .. Out_Last));
            end if;

            exit Main when Stream_End (Filter);

            --  The end of in buffer.

            exit when In_Last = Last;

            In_First := In_Last + 1;
         end loop;
      end loop Main;

   end Generic_Translate;

   ------------------
   -- Inflate_Init --
   ------------------

   procedure Inflate_Init
     (Filter      : in out Filter_Type;
      Window_Bits : in     Window_Bits_Type := Default_Window_Bits;
      Header      : in     Header_Type      := Default)
   is
      use type Thin.Int;
      Win_Bits : Thin.Int := Thin.Int (Window_Bits);

      procedure Check_Version;
      --  Check the latest header types compatibility.

      procedure Check_Version is
      begin
         if Version <= "1.1.4" then
            Raise_Error
              ("Inflate header type " & Header_Type'Image (Header)
               & " incompatible with ZLib version " & Version);
         end if;
      end Check_Version;

   begin
      if Is_Open (Filter) then
         raise Status_Error;
      end if;

      case Header is
         when None =>
            Check_Version;

            --  Inflate data without headers determined
            --  by negative Win_Bits.

            Win_Bits := -Win_Bits;
         when GZip =>
            Check_Version;

            --  Inflate gzip data defined by flag 16.

            Win_Bits := Win_Bits + 16;
         when Auto =>
            Check_Version;

            --  Inflate with automatic detection
            --  of gzip or native header defined by flag 32.

            Win_Bits := Win_Bits + 32;
         when Default => null;
      end case;

      Filter.Strm        := new Z_Stream;
      Filter.Compression := False;
      Filter.Stream_End  := False;
      Filter.Header      := Header;

      if Thin.Inflate_Init
         (To_Thin_Access (Filter.Strm), Win_Bits) /= Thin.Z_OK
      then
         Raise_Error (Filter.Strm.all);
      end if;
   end Inflate_Init;

   -------------
   -- Is_Open --
   -------------

   function Is_Open (Filter : in Filter_Type) return Boolean is
   begin
      return Filter.Strm /= null;
   end Is_Open;

   -----------------
   -- Raise_Error --
   -----------------

   procedure Raise_Error (Message : in String) is
   begin
      Ada.Exceptions.Raise_Exception (ZLib_Error'Identity, Message);
   end Raise_Error;

   procedure Raise_Error (Stream : in Z_Stream) is
   begin
      Raise_Error (Last_Error_Message (Stream));
   end Raise_Error;

   ----------
   -- Read --
   ----------

   procedure Read
     (Filter : in out Filter_Type;
      Item   :    out Ada.Streams.Stream_Element_Array;
      Last   :    out Ada.Streams.Stream_Element_Offset;
      Flush  : in     Flush_Mode := No_Flush)
   is
      In_Last    : Stream_Element_Offset;
      Item_First : Ada.Streams.Stream_Element_Offset := Item'First;
      V_Flush    : Flush_Mode := Flush;

   begin
      pragma Assert (Rest_First in Buffer'First .. Buffer'Last + 1);
      pragma Assert (Rest_Last in Buffer'First - 1 .. Buffer'Last);

      loop
         if Rest_Last = Buffer'First - 1 then
            V_Flush := Finish;

         elsif Rest_First > Rest_Last then
            Read (Buffer, Rest_Last);
            Rest_First := Buffer'First;

            if Rest_Last < Buffer'First then
               V_Flush := Finish;
            end if;
         end if;

         Translate
           (Filter   => Filter,
            In_Data  => Buffer (Rest_First .. Rest_Last),
            In_Last  => In_Last,
            Out_Data => Item (Item_First .. Item'Last),
            Out_Last => Last,
            Flush    => V_Flush);

         Rest_First := In_Last + 1;

         exit when Stream_End (Filter)
           or else Last = Item'Last
           or else (Last >= Item'First and then Allow_Read_Some);

         Item_First := Last + 1;
      end loop;
   end Read;

   ----------------
   -- Stream_End --
   ----------------

   function Stream_End (Filter : in Filter_Type) return Boolean is
   begin
      if Filter.Header = GZip and Filter.Compression then
         return Filter.Stream_End
            and then Filter.Offset = Footer_Array'Last + 1;
      else
         return Filter.Stream_End;
      end if;
   end Stream_End;

   --------------
   -- Total_In --
   --------------

   function Total_In (Filter : in Filter_Type) return Count is
   begin
      return Count (Thin.Total_In (To_Thin_Access (Filter.Strm).all));
   end Total_In;

   ---------------
   -- Total_Out --
   ---------------

   function Total_Out (Filter : in Filter_Type) return Count is
   begin
      return Count (Thin.Total_Out (To_Thin_Access (Filter.Strm).all));
   end Total_Out;

   ---------------
   -- Translate --
   ---------------

   procedure Translate
     (Filter    : in out Filter_Type;
      In_Data   : in     Ada.Streams.Stream_Element_Array;
      In_Last   :    out Ada.Streams.Stream_Element_Offset;
      Out_Data  :    out Ada.Streams.Stream_Element_Array;
      Out_Last  :    out Ada.Streams.Stream_Element_Offset;
      Flush     : in     Flush_Mode) is
   begin
      if Filter.Header = GZip and then Filter.Compression then
         Translate_GZip
           (Filter   => Filter,
            In_Data  => In_Data,
            In_Last  => In_Last,
            Out_Data => Out_Data,
            Out_Last => Out_Last,
            Flush    => Flush);
      else
         Translate_Auto
           (Filter   => Filter,
            In_Data  => In_Data,
            In_Last  => In_Last,
            Out_Data => Out_Data,
            Out_Last => Out_Last,
            Flush    => Flush);
      end if;
   end Translate;

   --------------------
   -- Translate_Auto --
   --------------------

   procedure Translate_Auto
     (Filter    : in out Filter_Type;
      In_Data   : in     Ada.Streams.Stream_Element_Array;
      In_Last   :    out Ada.Streams.Stream_Element_Offset;
      Out_Data  :    out Ada.Streams.Stream_Element_Array;
      Out_Last  :    out Ada.Streams.Stream_Element_Offset;
      Flush     : in     Flush_Mode)
   is
      use type Thin.Int;
      Code : Thin.Int;

   begin
      if not Is_Open (Filter) then
         raise Status_Error;
      end if;

      if Out_Data'Length = 0 and then In_Data'Length = 0 then
         raise Constraint_Error;
      end if;

      Set_Out (Filter.Strm.all, Out_Data'Address, Out_Data'Length);
      Set_In  (Filter.Strm.all, In_Data'Address, In_Data'Length);

      Code := Flate (Filter.Compression).Step
        (To_Thin_Access (Filter.Strm),
         Thin.Int (Flush));

      if Code = Thin.Z_STREAM_END then
         Filter.Stream_End := True;
      else
         Check_Error (Filter.Strm.all, Code);
      end if;

      In_Last  := In_Data'Last
         - Stream_Element_Offset (Avail_In (Filter.Strm.all));
      Out_Last := Out_Data'Last
         - Stream_Element_Offset (Avail_Out (Filter.Strm.all));
   end Translate_Auto;

   --------------------
   -- Translate_GZip --
   --------------------

   procedure Translate_GZip
     (Filter    : in out Filter_Type;
      In_Data   : in     Ada.Streams.Stream_Element_Array;
      In_Last   :    out Ada.Streams.Stream_Element_Offset;
      Out_Data  :    out Ada.Streams.Stream_Element_Array;
      Out_Last  :    out Ada.Streams.Stream_Element_Offset;
      Flush     : in     Flush_Mode)
   is
      Out_First : Stream_Element_Offset;

      procedure Add_Data (Data : in Stream_Element_Array);
      --  Add data to stream from the Filter.Offset till necessary,
      --  used for add gzip headr/footer.

      procedure Put_32
        (Item : in out Stream_Element_Array;
         Data : in     Unsigned_32);
      pragma Inline (Put_32);

      --------------
      -- Add_Data --
      --------------

      procedure Add_Data (Data : in Stream_Element_Array) is
         Data_First : Stream_Element_Offset renames Filter.Offset;
         Data_Last  : Stream_Element_Offset;
         Data_Len   : Stream_Element_Offset; --  -1
         Out_Len    : Stream_Element_Offset; --  -1
      begin
         Out_First := Out_Last + 1;

         if Data_First > Data'Last then
            return;
         end if;

         Data_Len  := Data'Last     - Data_First;
         Out_Len   := Out_Data'Last - Out_First;

         if Data_Len <= Out_Len then
            Out_Last  := Out_First  + Data_Len;
            Data_Last := Data'Last;
         else
            Out_Last  := Out_Data'Last;
            Data_Last := Data_First + Out_Len;
         end if;

         Out_Data (Out_First .. Out_Last) := Data (Data_First .. Data_Last);

         Data_First := Data_Last + 1;
         Out_First  := Out_Last + 1;
      end Add_Data;

      ------------
      -- Put_32 --
      ------------

      procedure Put_32
        (Item : in out Stream_Element_Array;
         Data : in     Unsigned_32)
      is
         D : Unsigned_32 := Data;
      begin
         for J in Item'First .. Item'First + 3 loop
            Item (J) := Stream_Element (D and 16#FF#);
            D := Shift_Right (D, 8);
         end loop;
      end Put_32;

   begin
      Out_Last := Out_Data'First - 1;

      if not Filter.Stream_End then
         Add_Data (Simple_GZip_Header);

         Translate_Auto
           (Filter   => Filter,
            In_Data  => In_Data,
            In_Last  => In_Last,
            Out_Data => Out_Data (Out_First .. Out_Data'Last),
            Out_Last => Out_Last,
            Flush    => Flush);

         CRC32 (Filter.CRC, In_Data (In_Data'First .. In_Last));
      end if;

      if Filter.Stream_End and then Out_Last <= Out_Data'Last then
         --  This detection method would work only when
         --  Simple_GZip_Header'Last > Footer_Array'Last

         if Filter.Offset = Simple_GZip_Header'Last + 1 then
            Filter.Offset := Footer_Array'First;
         end if;

         declare
            Footer : Footer_Array;
         begin
            Put_32 (Footer, Filter.CRC);
            Put_32 (Footer (Footer'First + 4 .. Footer'Last),
                    Unsigned_32 (Total_In (Filter)));
            Add_Data (Footer);
         end;
      end if;
   end Translate_GZip;

   -------------
   -- Version --
   -------------

   function Version return String is
   begin
      return Interfaces.C.Strings.Value (Thin.zlibVersion);
   end Version;

   -----------
   -- Write --
   -----------

   procedure Write
     (Filter : in out Filter_Type;
      Item   : in     Ada.Streams.Stream_Element_Array;
      Flush  : in     Flush_Mode := No_Flush)
   is
      Buffer   : Stream_Element_Array (1 .. Buffer_Size);
      In_Last  : Stream_Element_Offset;
      Out_Last : Stream_Element_Offset;
      In_First : Stream_Element_Offset := Item'First;
   begin
      if Item'Length = 0 and Flush = No_Flush then
         return;
      end if;

      loop
         Translate
           (Filter   => Filter,
            In_Data  => Item (In_First .. Item'Last),
            In_Last  => In_Last,
            Out_Data => Buffer,
            Out_Last => Out_Last,
            Flush    => Flush);

         if Out_Last >= Buffer'First then
            Write (Buffer (1 .. Out_Last));
         end if;

         exit when In_Last = Item'Last or Stream_End (Filter);

         In_First := In_Last + 1;
      end loop;
   end Write;

end ZLib;

------------------------------------------------------------------------------
--                      ZLib for Ada thick binding.                         --
--                                                                          --
--              Copyright (C) 2002-2004 Dmitriy Anisimkov                   --
--                                                                          --
--  This library is free software; you can redistribute it and/or modify    --
--  it under the terms of the GNU General Public License as published by    --
--  the Free Software Foundation; either version 2 of the License, or (at   --
--  your option) any later version.                                         --
--                                                                          --
--  This library is distributed in the hope that it will be useful, but     --
--  WITHOUT ANY WARRANTY; without even the implied warranty of              --
--  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU       --
--  General Public License for more details.                                --
--                                                                          --
--  You should have received a copy of the GNU General Public License       --
--  along with this library; if not, write to the Free Software Foundation, --
--  Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.          --
--                                                                          --
--  As a special exception, if other files instantiate generics from this   --
--  unit, or you link this unit with other files to produce an executable,  --
--  this  unit  does not  by itself cause  the resulting executable to be   --
--  covered by the GNU General Public License. This exception does not      --
--  however invalidate any other reasons why the executable file  might be  --
--  covered by the  GNU Public License.                                     --
------------------------------------------------------------------------------

--  $Id: zlib.ads,v 1.26 2004/09/06 06:53:19 vagul Exp $

with Ada.Streams;

with Interfaces;

package ZLib is

   ZLib_Error   : exception;
   Status_Error : exception;

   type Compression_Level is new Integer range -1 .. 9;

   type Flush_Mode is private;

   type Compression_Method is private;

   type Window_Bits_Type is new Integer range 8 .. 15;

   type Memory_Level_Type is new Integer range 1 .. 9;

   type Unsigned_32 is new Interfaces.Unsigned_32;

   type Strategy_Type is private;

   type Header_Type is (None, Auto, Default, GZip);
   --  Header type usage have a some limitation for inflate.
   --  See comment for Inflate_Init.

   subtype Count is Ada.Streams.Stream_Element_Count;

   Default_Memory_Level : constant Memory_Level_Type := 8;
   Default_Window_Bits  : constant Window_Bits_Type  := 15;

   ----------------------------------
   -- Compression method constants --
   ----------------------------------

   Deflated : constant Compression_Method;
   --  Only one method allowed in this ZLib version

   ---------------------------------
   -- Compression level constants --
   ---------------------------------

   No_Compression      : constant Compression_Level := 0;
   Best_Speed          : constant Compression_Level := 1;
   Best_Compression    : constant Compression_Level := 9;
   Default_Compression : constant Compression_Level := -1;

   --------------------------
   -- Flush mode constants --
   --------------------------

   No_Flush      : constant Flush_Mode;
   --  Regular way for compression, no flush

   Partial_Flush : constant Flush_Mode;
   --  Will be removed, use Z_SYNC_FLUSH instead

   Sync_Flush    : constant Flush_Mode;
   --  All pending output is flushed to the output buffer and the output
   --  is aligned on a byte boundary, so that the decompressor can get all
   --  input data available so far. (In particular avail_in is zero after the
   --  call if enough output space has been provided  before the call.)
   --  Flushing may degrade compression for some compression algorithms and so
   --  it should be used only when necessary.

   Block_Flush   : constant Flush_Mode;
   --  Z_BLOCK requests that inflate() stop
   --  if and when it get to the next deflate block boundary. When decoding the
   --  zlib or gzip format, this will cause inflate() to return immediately
   --  after the header and before the first block. When doing a raw inflate,
   --  inflate() will go ahead and process the first block, and will return
   --  when it gets to the end of that block, or when it runs out of data.

   Full_Flush    : constant Flush_Mode;
   --  All output is flushed as with SYNC_FLUSH, and the compression state
   --  is reset so that decompression can restart from this point if previous
   --  compressed data has been damaged or if random access is desired. Using
   --  Full_Flush too often can seriously degrade the compression.

   Finish        : constant Flush_Mode;
   --  Just for tell the compressor that input data is complete.

   ------------------------------------
   -- Compression strategy constants --
   ------------------------------------

   --  RLE stategy could be used only in version 1.2.0 and later.

   Filtered         : constant Strategy_Type;
   Huffman_Only     : constant Strategy_Type;
   RLE              : constant Strategy_Type;
   Default_Strategy : constant Strategy_Type;

   Default_Buffer_Size : constant := 4096;

   type Filter_Type is tagged limited private;
   --  The filter is for compression and for decompression.
   --  The usage of the type is depend of its initialization.

   function Version return String;
   pragma Inline (Version);
   --  Return string representation of the ZLib version.

   procedure Deflate_Init
     (Filter       : in out Filter_Type;
      Level        : in     Compression_Level  := Default_Compression;
      Strategy     : in     Strategy_Type      := Default_Strategy;
      Method       : in     Compression_Method := Deflated;
      Window_Bits  : in     Window_Bits_Type   := Default_Window_Bits;
      Memory_Level : in     Memory_Level_Type  := Default_Memory_Level;
      Header       : in     Header_Type        := Default);
   --  Compressor initialization.
   --  When Header parameter is Auto or Default, then default zlib header
   --  would be provided for compressed data.
   --  When Header is GZip, then gzip header would be set instead of
   --  default header.
   --  When Header is None, no header would be set for compressed data.

   procedure Inflate_Init
     (Filter      : in out Filter_Type;
      Window_Bits : in     Window_Bits_Type := Default_Window_Bits;
      Header      : in     Header_Type      := Default);
   --  Decompressor initialization.
   --  Default header type mean that ZLib default header is expecting in the
   --  input compressed stream.
   --  Header type None mean that no header is expecting in the input stream.
   --  GZip header type mean that GZip header is expecting in the
   --  input compressed stream.
   --  Auto header type mean that header type (GZip or Native) would be
   --  detected automatically in the input stream.
   --  Note that header types parameter values None, GZip and Auto are
   --  supported for inflate routine only in ZLib versions 1.2.0.2 and later.
   --  Deflate_Init is supporting all header types.

   function Is_Open (Filter : in Filter_Type) return Boolean;
   pragma Inline (Is_Open);
   --  Is the filter opened for compression or decompression.

   procedure Close
     (Filter       : in out Filter_Type;
      Ignore_Error : in     Boolean := False);
   --  Closing the compression or decompressor.
   --  If stream is closing before the complete and Ignore_Error is False,
   --  The exception would be raised.

   generic
      with procedure Data_In
        (Item : out Ada.Streams.Stream_Element_Array;
         Last : out Ada.Streams.Stream_Element_Offset);
      with procedure Data_Out
        (Item : in Ada.Streams.Stream_Element_Array);
   procedure Generic_Translate
     (Filter          : in out Filter_Type;
      In_Buffer_Size  : in     Integer := Default_Buffer_Size;
      Out_Buffer_Size : in     Integer := Default_Buffer_Size);
   --  Compress/decompress data fetch from Data_In routine and pass the result
   --  to the Data_Out routine. User should provide Data_In and Data_Out
   --  for compression/decompression data flow.
   --  Compression or decompression depend on Filter initialization.

   function Total_In (Filter : in Filter_Type) return Count;
   pragma Inline (Total_In);
   --  Returns total number of input bytes read so far

   function Total_Out (Filter : in Filter_Type) return Count;
   pragma Inline (Total_Out);
   --  Returns total number of bytes output so far

   function CRC32
     (CRC    : in Unsigned_32;
      Data   : in Ada.Streams.Stream_Element_Array)
      return Unsigned_32;
   pragma Inline (CRC32);
   --  Compute CRC32, it could be necessary for make gzip format

   procedure CRC32
     (CRC  : in out Unsigned_32;
      Data : in     Ada.Streams.Stream_Element_Array);
   pragma Inline (CRC32);
   --  Compute CRC32, it could be necessary for make gzip format

   -------------------------------------------------
   --  Below is more complex low level routines.  --
   -------------------------------------------------

   procedure Translate
     (Filter    : in out Filter_Type;
      In_Data   : in     Ada.Streams.Stream_Element_Array;
      In_Last   :    out Ada.Streams.Stream_Element_Offset;
      Out_Data  :    out Ada.Streams.Stream_Element_Array;
      Out_Last  :    out Ada.Streams.Stream_Element_Offset;
      Flush     : in     Flush_Mode);
   --  Compress/decompress the In_Data buffer and place the result into
   --  Out_Data. In_Last is the index of last element from In_Data accepted by
   --  the Filter. Out_Last is the last element of the received data from
   --  Filter. To tell the filter that incoming data are complete put the
   --  Flush parameter to Finish.

   function Stream_End (Filter : in Filter_Type) return Boolean;
   pragma Inline (Stream_End);
   --  Return the true when the stream is complete.

   procedure Flush
     (Filter    : in out Filter_Type;
      Out_Data  :    out Ada.Streams.Stream_Element_Array;
      Out_Last  :    out Ada.Streams.Stream_Element_Offset;
      Flush     : in     Flush_Mode);
   pragma Inline (Flush);
   --  Flushing the data from the compressor.

   generic
      with procedure Write
        (Item : in Ada.Streams.Stream_Element_Array);
      --  User should provide this routine for accept
      --  compressed/decompressed data.

      Buffer_Size : in Ada.Streams.Stream_Element_Offset
         := Default_Buffer_Size;
      --  Buffer size for Write user routine.

   procedure Write
     (Filter  : in out Filter_Type;
      Item    : in     Ada.Streams.Stream_Element_Array;
      Flush   : in     Flush_Mode := No_Flush);
   --  Compress/Decompress data from Item to the generic parameter procedure
   --  Write. Output buffer size could be set in Buffer_Size generic parameter.

   generic
      with procedure Read
        (Item : out Ada.Streams.Stream_Element_Array;
         Last : out Ada.Streams.Stream_Element_Offset);
      --  User should provide data for compression/decompression
      --  thru this routine.

      Buffer : in out Ada.Streams.Stream_Element_Array;
      --  Buffer for keep remaining data from the previous
      --  back read.

      Rest_First, Rest_Last : in out Ada.Streams.Stream_Element_Offset;
      --  Rest_First have to be initialized to Buffer'Last + 1
      --  Rest_Last have to be initialized to Buffer'Last
      --  before usage.

      Allow_Read_Some : in Boolean := False;
      --  Is it allowed to return Last < Item'Last before end of data.

   procedure Read
     (Filter : in out Filter_Type;
      Item   :    out Ada.Streams.Stream_Element_Array;
      Last   :    out Ada.Streams.Stream_Element_Offset;
      Flush  : in     Flush_Mode := No_Flush);
   --  Compress/Decompress data from generic parameter procedure Read to the
   --  Item. User should provide Buffer and initialized Rest_First, Rest_Last
   --  indicators. If Allow_Read_Some is True, Read routines could return
   --  Last < Item'Last only at end of stream.

private

   use Ada.Streams;

   pragma Assert (Ada.Streams.Stream_Element'Size    =    8);
   pragma Assert (Ada.Streams.Stream_Element'Modulus = 2**8);

   type Flush_Mode is new Integer range 0 .. 5;

   type Compression_Method is new Integer range 8 .. 8;

   type Strategy_Type is new Integer range 0 .. 3;

   No_Flush      : constant Flush_Mode := 0;
   Partial_Flush : constant Flush_Mode := 1;
   Sync_Flush    : constant Flush_Mode := 2;
   Full_Flush    : constant Flush_Mode := 3;
   Finish        : constant Flush_Mode := 4;
   Block_Flush   : constant Flush_Mode := 5;

   Filtered         : constant Strategy_Type := 1;
   Huffman_Only     : constant Strategy_Type := 2;
   RLE              : constant Strategy_Type := 3;
   Default_Strategy : constant Strategy_Type := 0;

   Deflated : constant Compression_Method := 8;

   type Z_Stream;

   type Z_Stream_Access is access all Z_Stream;

   type Filter_Type is tagged limited record
      Strm        : Z_Stream_Access;
      Compression : Boolean;
      Stream_End  : Boolean;
      Header      : Header_Type;
      CRC         : Unsigned_32;
      Offset      : Stream_Element_Offset;
      --  Offset for gzip header/footer output.
   end record;

end ZLib;

project Zlib is

   for Languages use ("Ada");
   for Source_Dirs use (".");
   for Object_Dir use ".";
   for Main use ("test.adb", "mtest.adb", "read.adb", "buffer_demo");

   package Compiler is
      for Default_Switches ("ada") use ("-gnatwcfilopru", "-gnatVcdfimorst", "-gnatyabcefhiklmnoprst");
   end Compiler;

   package Linker is
      for Default_Switches ("ada") use ("-lz");
   end Linker;

   package Builder is
      for Default_Switches ("ada") use ("-s", "-gnatQ");
   end Builder;

end Zlib;

/*
 * match.S -- optimized version of longest_match()
 * based on the similar work by Gilles Vollant, and Brian Raiter, written 1998
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the BSD License. Use by owners of Che Guevarra
 * parafernalia is prohibited, where possible, and highly discouraged
 * elsewhere.
 */

#ifndef NO_UNDERLINE
#	define	match_init	_match_init
#	define	longest_match	_longest_match
#endif

#define	scanend		ebx
#define	scanendw	bx
#define	chainlenwmask	edx /* high word: current chain len low word: s->wmask */
#define	curmatch	rsi
#define	curmatchd	esi
#define	windowbestlen	r8
#define	scanalign	r9
#define	scanalignd	r9d
#define	window		r10
#define	bestlen		r11
#define	bestlend	r11d
#define	scanstart	r12d
#define	scanstartw	r12w
#define scan		r13
#define nicematch	r14d
#define	limit		r15
#define	limitd		r15d
#define prev		rcx

/*
 * The 258 is a "magic number, not a parameter -- changing it
 * breaks the hell loose
 */
#define	MAX_MATCH	(258)
#define	MIN_MATCH	(3)
#define	MIN_LOOKAHEAD	(MAX_MATCH + MIN_MATCH + 1)
#define	MAX_MATCH_8	((MAX_MATCH + 7) & ~7)

/* stack frame offsets */
#define	LocalVarsSize	(112)
#define _chainlenwmask	( 8-LocalVarsSize)(%rsp)
#define _windowbestlen	(16-LocalVarsSize)(%rsp)
#define save_r14        (24-LocalVarsSize)(%rsp)
#define save_rsi        (32-LocalVarsSize)(%rsp)
#define save_rbx        (40-LocalVarsSize)(%rsp)
#define save_r12        (56-LocalVarsSize)(%rsp)
#define save_r13        (64-LocalVarsSize)(%rsp)
#define save_r15        (80-LocalVarsSize)(%rsp)


.globl	match_init, longest_match

/*
 * On AMD64 the first argument of a function (in our case -- the pointer to
 * deflate_state structure) is passed in %rdi, hence our offsets below are
 * all off of that.
 */

/* you can check the structure offset by running

#include <stdlib.h>
#include <stdio.h>
#include "deflate.h"

void print_depl()
{
deflate_state ds;
deflate_state *s=&ds;
printf("size pointer=%u\n",(int)sizeof(void*));

printf("#define dsWSize         (%3u)(%%rdi)\n",(int)(((char*)&(s->w_size))-((char*)s)));
printf("#define dsWMask         (%3u)(%%rdi)\n",(int)(((char*)&(s->w_mask))-((char*)s)));
printf("#define dsWindow        (%3u)(%%rdi)\n",(int)(((char*)&(s->window))-((char*)s)));
printf("#define dsPrev          (%3u)(%%rdi)\n",(int)(((char*)&(s->prev))-((char*)s)));
printf("#define dsMatchLen      (%3u)(%%rdi)\n",(int)(((char*)&(s->match_length))-((char*)s)));
printf("#define dsPrevMatch     (%3u)(%%rdi)\n",(int)(((char*)&(s->prev_match))-((char*)s)));
printf("#define dsStrStart      (%3u)(%%rdi)\n",(int)(((char*)&(s->strstart))-((char*)s)));
printf("#define dsMatchStart    (%3u)(%%rdi)\n",(int)(((char*)&(s->match_start))-((char*)s)));
printf("#define dsLookahead     (%3u)(%%rdi)\n",(int)(((char*)&(s->lookahead))-((char*)s)));
printf("#define dsPrevLen       (%3u)(%%rdi)\n",(int)(((char*)&(s->prev_length))-((char*)s)));
printf("#define dsMaxChainLen   (%3u)(%%rdi)\n",(int)(((char*)&(s->max_chain_length))-((char*)s)));
printf("#define dsGoodMatch     (%3u)(%%rdi)\n",(int)(((char*)&(s->good_match))-((char*)s)));
printf("#define dsNiceMatch     (%3u)(%%rdi)\n",(int)(((char*)&(s->nice_match))-((char*)s)));
}

*/


/*
  to compile for XCode 3.2 on MacOSX x86_64
  - run "gcc -g -c -DXCODE_MAC_X64_STRUCTURE amd64-match.S"
 */


#ifndef CURRENT_LINX_XCODE_MAC_X64_STRUCTURE
#define dsWSize		( 68)(%rdi)
#define dsWMask		( 76)(%rdi)
#define dsWindow	( 80)(%rdi)
#define dsPrev		( 96)(%rdi)
#define dsMatchLen	(144)(%rdi)
#define dsPrevMatch	(148)(%rdi)
#define dsStrStart	(156)(%rdi)
#define dsMatchStart	(160)(%rdi)
#define dsLookahead	(164)(%rdi)
#define dsPrevLen	(168)(%rdi)
#define dsMaxChainLen	(172)(%rdi)
#define dsGoodMatch	(188)(%rdi)
#define dsNiceMatch	(192)(%rdi)

#else 

#ifndef STRUCT_OFFSET
#	define STRUCT_OFFSET	(0)
#endif


#define dsWSize		( 56 + STRUCT_OFFSET)(%rdi)
#define dsWMask		( 64 + STRUCT_OFFSET)(%rdi)
#define dsWindow	( 72 + STRUCT_OFFSET)(%rdi)
#define dsPrev		( 88 + STRUCT_OFFSET)(%rdi)
#define dsMatchLen	(136 + STRUCT_OFFSET)(%rdi)
#define dsPrevMatch	(140 + STRUCT_OFFSET)(%rdi)
#define dsStrStart	(148 + STRUCT_OFFSET)(%rdi)
#define dsMatchStart	(152 + STRUCT_OFFSET)(%rdi)
#define dsLookahead	(156 + STRUCT_OFFSET)(%rdi)
#define dsPrevLen	(160 + STRUCT_OFFSET)(%rdi)
#define dsMaxChainLen	(164 + STRUCT_OFFSET)(%rdi)
#define dsGoodMatch	(180 + STRUCT_OFFSET)(%rdi)
#define dsNiceMatch	(184 + STRUCT_OFFSET)(%rdi)

#endif




.text

/* uInt longest_match(deflate_state *deflatestate, IPos curmatch) */

longest_match:
/*
 * Retrieve the function arguments. %curmatch will hold cur_match
 * throughout the entire function (passed via rsi on amd64).
 * rdi will hold the pointer to the deflate_state (first arg on amd64)
 */
		mov     %rsi, save_rsi
		mov     %rbx, save_rbx
		mov	%r12, save_r12
		mov     %r13, save_r13
		mov     %r14, save_r14
		mov     %r15, save_r15

/* uInt wmask = s->w_mask;						*/
/* unsigned chain_length = s->max_chain_length;				*/
/* if (s->prev_length >= s->good_match) {				*/
/*     chain_length >>= 2;						*/
/* }									*/

		movl	dsPrevLen, %eax
		movl	dsGoodMatch, %ebx
		cmpl	%ebx, %eax
		movl	dsWMask, %eax
		movl	dsMaxChainLen, %chainlenwmask
		jl	LastMatchGood
		shrl	$2, %chainlenwmask
LastMatchGood:

/* chainlen is decremented once beforehand so that the function can	*/
/* use the sign flag instead of the zero flag for the exit test.	*/
/* It is then shifted into the high word, to make room for the wmask	*/
/* value, which it will always accompany.				*/

		decl	%chainlenwmask
		shll	$16, %chainlenwmask
		orl	%eax, %chainlenwmask

/* if ((uInt)nice_match > s->lookahead) nice_match = s->lookahead;	*/

		movl	dsNiceMatch, %eax
		movl	dsLookahead, %ebx
		cmpl	%eax, %ebx
		jl	LookaheadLess
		movl	%eax, %ebx
LookaheadLess:	movl	%ebx, %nicematch

/* register Bytef *scan = s->window + s->strstart;			*/

		mov	dsWindow, %window
		movl	dsStrStart, %limitd
		lea	(%limit, %window), %scan

/* Determine how many bytes the scan ptr is off from being		*/
/* dword-aligned.							*/

		mov	%scan, %scanalign
		negl	%scanalignd
		andl	$3, %scanalignd

/* IPos limit = s->strstart > (IPos)MAX_DIST(s) ?			*/
/*     s->strstart - (IPos)MAX_DIST(s) : NIL;				*/

		movl	dsWSize, %eax
		subl	$MIN_LOOKAHEAD, %eax
		xorl	%ecx, %ecx
		subl	%eax, %limitd
		cmovng	%ecx, %limitd

/* int best_len = s->prev_length;					*/

		movl	dsPrevLen, %bestlend

/* Store the sum of s->window + best_len in %windowbestlen locally, and in memory.	*/

		lea	(%window, %bestlen), %windowbestlen
		mov	%windowbestlen, _windowbestlen

/* register ush scan_start = *(ushf*)scan;				*/
/* register ush scan_end   = *(ushf*)(scan+best_len-1);			*/
/* Posf *prev = s->prev;						*/

		movzwl	(%scan), %scanstart
		movzwl	-1(%scan, %bestlen), %scanend
		mov	dsPrev, %prev

/* Jump into the main loop.						*/

		movl	%chainlenwmask, _chainlenwmask
		jmp	LoopEntry

.balign 16

/* do {
 *     match = s->window + cur_match;
 *     if (*(ushf*)(match+best_len-1) != scan_end ||
 *         *(ushf*)match != scan_start) continue;
 *     [...]
 * } while ((cur_match = prev[cur_match & wmask]) > limit
 *          && --chain_length != 0);
 *
 * Here is the inner loop of the function. The function will spend the
 * majority of its time in this loop, and majority of that time will
 * be spent in the first ten instructions.
 */
LookupLoop:
		andl	%chainlenwmask, %curmatchd
		movzwl	(%prev, %curmatch, 2), %curmatchd
		cmpl	%limitd, %curmatchd
		jbe	LeaveNow
		subl	$0x00010000, %chainlenwmask
		js	LeaveNow
LoopEntry:	cmpw	-1(%windowbestlen, %curmatch), %scanendw
		jne	LookupLoop
		cmpw	%scanstartw, (%window, %curmatch)
		jne	LookupLoop

/* Store the current value of chainlen.					*/
		movl	%chainlenwmask, _chainlenwmask

/* %scan is the string under scrutiny, and %prev to the string we	*/
/* are hoping to match it up with. In actuality, %esi and %edi are	*/
/* both pointed (MAX_MATCH_8 - scanalign) bytes ahead, and %edx is	*/
/* initialized to -(MAX_MATCH_8 - scanalign).				*/

		mov	$(-MAX_MATCH_8), %rdx
		lea	(%curmatch, %window), %windowbestlen
		lea	MAX_MATCH_8(%windowbestlen, %scanalign), %windowbestlen
		lea	MAX_MATCH_8(%scan, %scanalign), %prev

/* the prefetching below makes very little difference... */
		prefetcht1	(%windowbestlen, %rdx)
		prefetcht1	(%prev, %rdx)

/*
 * Test the strings for equality, 8 bytes at a time. At the end,
 * adjust %rdx so that it is offset to the exact byte that mismatched.
 *
 * It should be confessed that this loop usually does not represent
 * much of the total running time. Replacing it with a more
 * straightforward "rep cmpsb" would not drastically degrade
 * performance -- unrolling it, for example, makes no difference.
 */

#undef USE_SSE	/* works, but is 6-7% slower, than non-SSE... */

LoopCmps:
#ifdef USE_SSE
		/* Preload the SSE registers */
		movdqu	  (%windowbestlen, %rdx), %xmm1
		movdqu	  (%prev, %rdx), %xmm2
		pcmpeqb	%xmm2, %xmm1
		movdqu	16(%windowbestlen, %rdx), %xmm3
		movdqu	16(%prev, %rdx), %xmm4
		pcmpeqb	%xmm4, %xmm3
		movdqu	32(%windowbestlen, %rdx), %xmm5
		movdqu	32(%prev, %rdx), %xmm6
		pcmpeqb	%xmm6, %xmm5
		movdqu	48(%windowbestlen, %rdx), %xmm7
		movdqu	48(%prev, %rdx), %xmm8
		pcmpeqb	%xmm8, %xmm7

		/* Check the comparisions' results */
		pmovmskb %xmm1, %rax
		notw	%ax
		bsfw	%ax, %ax
		jnz	LeaveLoopCmps
		
		/* this is the only iteration of the loop with a possibility of having
		   incremented rdx by 0x108 (each loop iteration add 16*4 = 0x40 
		   and (0x40*4)+8=0x108 */
		add	$8, %rdx
		jz LenMaximum
		add	$8, %rdx

		
		pmovmskb %xmm3, %rax
		notw	%ax
		bsfw	%ax, %ax
		jnz	LeaveLoopCmps
		
		
		add	$16, %rdx


		pmovmskb %xmm5, %rax
		notw	%ax
		bsfw	%ax, %ax
		jnz	LeaveLoopCmps
		
		add	$16, %rdx


		pmovmskb %xmm7, %rax
		notw	%ax
		bsfw	%ax, %ax
		jnz	LeaveLoopCmps
		
		add	$16, %rdx
		
		jmp	LoopCmps
LeaveLoopCmps:	add	%rax, %rdx
#else
		mov	(%windowbestlen, %rdx), %rax
		xor	(%prev, %rdx), %rax
		jnz	LeaveLoopCmps
		
		mov	8(%windowbestlen, %rdx), %rax
		xor	8(%prev, %rdx), %rax
		jnz	LeaveLoopCmps8

		mov	16(%windowbestlen, %rdx), %rax
		xor	16(%prev, %rdx), %rax
		jnz	LeaveLoopCmps16
				
		add	$24, %rdx
		jnz	LoopCmps
		jmp	LenMaximum
#	if 0
/*
 * This three-liner is tantalizingly simple, but bsf is a slow instruction,
 * and the complicated alternative down below is quite a bit faster. Sad...
 */

LeaveLoopCmps:	bsf	%rax, %rax /* find the first non-zero bit */
		shrl	$3, %eax /* divide by 8 to get the byte */
		add	%rax, %rdx
#	else
LeaveLoopCmps16:
		add	$8, %rdx
LeaveLoopCmps8:
		add	$8, %rdx
LeaveLoopCmps:	testl   $0xFFFFFFFF, %eax /* Check the first 4 bytes */
		jnz     Check16
		add     $4, %rdx
		shr     $32, %rax
Check16:        testw   $0xFFFF, %ax
		jnz     LenLower
		add	$2, %rdx
		shrl	$16, %eax
LenLower:	subb	$1, %al
		adc	$0, %rdx
#	endif
#endif

/* Calculate the length of the match. If it is longer than MAX_MATCH,	*/
/* then automatically accept it as the best possible match and leave.	*/

		lea	(%prev, %rdx), %rax
		sub	%scan, %rax
		cmpl	$MAX_MATCH, %eax
		jge	LenMaximum

/* If the length of the match is not longer than the best match we	*/
/* have so far, then forget it and return to the lookup loop.		*/

		cmpl	%bestlend, %eax
		jg	LongerMatch
		mov	_windowbestlen, %windowbestlen
		mov	dsPrev, %prev
		movl	_chainlenwmask, %edx
		jmp	LookupLoop

/*         s->match_start = cur_match;					*/
/*         best_len = len;						*/
/*         if (len >= nice_match) break;				*/
/*         scan_end = *(ushf*)(scan+best_len-1);			*/

LongerMatch:
		movl	%eax, %bestlend
		movl	%curmatchd, dsMatchStart
		cmpl	%nicematch, %eax
		jge	LeaveNow

		lea	(%window, %bestlen), %windowbestlen
		mov	%windowbestlen, _windowbestlen

		movzwl	-1(%scan, %rax), %scanend
		mov	dsPrev, %prev
		movl	_chainlenwmask, %chainlenwmask
		jmp	LookupLoop

/* Accept the current string, with the maximum possible length.		*/

LenMaximum:
		movl	$MAX_MATCH, %bestlend
		movl	%curmatchd, dsMatchStart

/* if ((uInt)best_len <= s->lookahead) return (uInt)best_len;		*/
/* return s->lookahead;							*/

LeaveNow:
		movl	dsLookahead, %eax
		cmpl	%eax, %bestlend
		cmovngl	%bestlend, %eax
LookaheadRet:

/* Restore the registers and return from whence we came.			*/

	mov	save_rsi, %rsi
	mov	save_rbx, %rbx
	mov	save_r12, %r12
	mov	save_r13, %r13
	mov	save_r14, %r14
	mov	save_r15, %r15

	ret

match_init:	ret

This is a patched version of zlib, modified to use
Pentium-Pro-optimized assembly code in the deflation algorithm. The
files changed/added by this patch are:

README.686
match.S

The speedup that this patch provides varies, depending on whether the
compiler used to build the original version of zlib falls afoul of the
PPro's speed traps. My own tests show a speedup of around 10-20% at
the default compression level, and 20-30% using -9, against a version
compiled using gcc 2.7.2.3. Your mileage may vary.

Note that this code has been tailored for the PPro/PII in particular,
and will not perform particuarly well on a Pentium.

If you are using an assembler other than GNU as, you will have to
translate match.S to use your assembler's syntax. (Have fun.)

Brian Raiter
breadbox@muppetlabs.com
April, 1998


Added for zlib 1.1.3:

The patches come from
http://www.muppetlabs.com/~breadbox/software/assembly.html

To compile zlib with this asm file, copy match.S to the zlib directory
then do:

CFLAGS="-O3 -DASMV" ./configure
make OBJA=match.o


Update:

I've been ignoring these assembly routines for years, believing that
gcc's generated code had caught up with it sometime around gcc 2.95
and the major rearchitecting of the Pentium 4. However, I recently
learned that, despite what I believed, this code still has some life
in it. On the Pentium 4 and AMD64 chips, it continues to run about 8%
faster than the code produced by gcc 4.1.

In acknowledgement of its continuing usefulness, I've altered the
license to match that of the rest of zlib. Share and Enjoy!

Brian Raiter
breadbox@muppetlabs.com
April, 2007

/* match.S -- x86 assembly version of the zlib longest_match() function.
 * Optimized for the Intel 686 chips (PPro and later).
 *
 * Copyright (C) 1998, 2007 Brian Raiter <breadbox@muppetlabs.com>
 *
 * This software is provided 'as-is', without any express or implied
 * warranty.  In no event will the author be held liable for any damages
 * arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 *    claim that you wrote the original software. If you use this software
 *    in a product, an acknowledgment in the product documentation would be
 *    appreciated but is not required.
 * 2. Altered source versions must be plainly marked as such, and must not be
 *    misrepresented as being the original software.
 * 3. This notice may not be removed or altered from any source distribution.
 */

#ifndef NO_UNDERLINE
#define	match_init	_match_init
#define	longest_match	_longest_match
#endif

#define	MAX_MATCH	(258)
#define	MIN_MATCH	(3)
#define	MIN_LOOKAHEAD	(MAX_MATCH + MIN_MATCH + 1)
#define	MAX_MATCH_8	((MAX_MATCH + 7) & ~7)

/* stack frame offsets */

#define	chainlenwmask		0	/* high word: current chain len	*/
					/* low word: s->wmask		*/
#define	window			4	/* local copy of s->window	*/
#define	windowbestlen		8	/* s->window + bestlen		*/
#define	scanstart		16	/* first two bytes of string	*/
#define	scanend			12	/* last two bytes of string	*/
#define	scanalign		20	/* dword-misalignment of string	*/
#define	nicematch		24	/* a good enough match size	*/
#define	bestlen			28	/* size of best match so far	*/
#define	scan			32	/* ptr to string wanting match	*/

#define	LocalVarsSize		(36)
/*	saved ebx		36 */
/*	saved edi		40 */
/*	saved esi		44 */
/*	saved ebp		48 */
/*	return address		52 */
#define	deflatestate		56	/* the function arguments	*/
#define	curmatch		60

/* All the +zlib1222add offsets are due to the addition of fields
 *  in zlib in the deflate_state structure since the asm code was first written
 * (if you compile with zlib 1.0.4 or older, use "zlib1222add equ (-4)").
 * (if you compile with zlib between 1.0.5 and 1.2.2.1, use "zlib1222add equ 0").
 * if you compile with zlib 1.2.2.2 or later , use "zlib1222add equ 8").
 */

#define zlib1222add		(8)

#define	dsWSize			(36+zlib1222add)
#define	dsWMask			(44+zlib1222add)
#define	dsWindow		(48+zlib1222add)
#define	dsPrev			(56+zlib1222add)
#define	dsMatchLen		(88+zlib1222add)
#define	dsPrevMatch		(92+zlib1222add)
#define	dsStrStart		(100+zlib1222add)
#define	dsMatchStart		(104+zlib1222add)
#define	dsLookahead		(108+zlib1222add)
#define	dsPrevLen		(112+zlib1222add)
#define	dsMaxChainLen		(116+zlib1222add)
#define	dsGoodMatch		(132+zlib1222add)
#define	dsNiceMatch		(136+zlib1222add)


.file "match.S"

.globl	match_init, longest_match

.text

/* uInt longest_match(deflate_state *deflatestate, IPos curmatch) */
.cfi_sections	.debug_frame

longest_match:

.cfi_startproc
/* Save registers that the compiler may be using, and adjust %esp to	*/
/* make room for our stack frame.					*/

		pushl	%ebp
		.cfi_def_cfa_offset 8
		.cfi_offset ebp, -8
		pushl	%edi
		.cfi_def_cfa_offset 12
		pushl	%esi
		.cfi_def_cfa_offset 16
		pushl	%ebx
		.cfi_def_cfa_offset 20
		subl	$LocalVarsSize, %esp
		.cfi_def_cfa_offset LocalVarsSize+20

/* Retrieve the function arguments. %ecx will hold cur_match		*/
/* throughout the entire function. %edx will hold the pointer to the	*/
/* deflate_state structure during the function's setup (before		*/
/* entering the main loop).						*/

		movl	deflatestate(%esp), %edx
		movl	curmatch(%esp), %ecx

/* uInt wmask = s->w_mask;						*/
/* unsigned chain_length = s->max_chain_length;				*/
/* if (s->prev_length >= s->good_match) {				*/
/*     chain_length >>= 2;						*/
/* }									*/
 
		movl	dsPrevLen(%edx), %eax
		movl	dsGoodMatch(%edx), %ebx
		cmpl	%ebx, %eax
		movl	dsWMask(%edx), %eax
		movl	dsMaxChainLen(%edx), %ebx
		jl	LastMatchGood
		shrl	$2, %ebx
LastMatchGood:

/* chainlen is decremented once beforehand so that the function can	*/
/* use the sign flag instead of the zero flag for the exit test.	*/
/* It is then shifted into the high word, to make room for the wmask	*/
/* value, which it will always accompany.				*/

		decl	%ebx
		shll	$16, %ebx
		orl	%eax, %ebx
		movl	%ebx, chainlenwmask(%esp)

/* if ((uInt)nice_match > s->lookahead) nice_match = s->lookahead;	*/

		movl	dsNiceMatch(%edx), %eax
		movl	dsLookahead(%edx), %ebx
		cmpl	%eax, %ebx
		jl	LookaheadLess
		movl	%eax, %ebx
LookaheadLess:	movl	%ebx, nicematch(%esp)

/* register Bytef *scan = s->window + s->strstart;			*/

		movl	dsWindow(%edx), %esi
		movl	%esi, window(%esp)
		movl	dsStrStart(%edx), %ebp
		lea	(%esi,%ebp), %edi
		movl	%edi, scan(%esp)

/* Determine how many bytes the scan ptr is off from being		*/
/* dword-aligned.							*/

		movl	%edi, %eax
		negl	%eax
		andl	$3, %eax
		movl	%eax, scanalign(%esp)

/* IPos limit = s->strstart > (IPos)MAX_DIST(s) ?			*/
/*     s->strstart - (IPos)MAX_DIST(s) : NIL;				*/

		movl	dsWSize(%edx), %eax
		subl	$MIN_LOOKAHEAD, %eax
		subl	%eax, %ebp
		jg	LimitPositive
		xorl	%ebp, %ebp
LimitPositive:

/* int best_len = s->prev_length;					*/

		movl	dsPrevLen(%edx), %eax
		movl	%eax, bestlen(%esp)

/* Store the sum of s->window + best_len in %esi locally, and in %esi.	*/

		addl	%eax, %esi
		movl	%esi, windowbestlen(%esp)

/* register ush scan_start = *(ushf*)scan;				*/
/* register ush scan_end   = *(ushf*)(scan+best_len-1);			*/
/* Posf *prev = s->prev;						*/

		movzwl	(%edi), %ebx
		movl	%ebx, scanstart(%esp)
		movzwl	-1(%edi,%eax), %ebx
		movl	%ebx, scanend(%esp)
		movl	dsPrev(%edx), %edi

/* Jump into the main loop.						*/

		movl	chainlenwmask(%esp), %edx
		jmp	LoopEntry

.balign 16

/* do {
 *     match = s->window + cur_match;
 *     if (*(ushf*)(match+best_len-1) != scan_end ||
 *         *(ushf*)match != scan_start) continue;
 *     [...]
 * } while ((cur_match = prev[cur_match & wmask]) > limit
 *          && --chain_length != 0);
 *
 * Here is the inner loop of the function. The function will spend the
 * majority of its time in this loop, and majority of that time will
 * be spent in the first ten instructions.
 *
 * Within this loop:
 * %ebx = scanend
 * %ecx = curmatch
 * %edx = chainlenwmask - i.e., ((chainlen << 16) | wmask)
 * %esi = windowbestlen - i.e., (window + bestlen)
 * %edi = prev
 * %ebp = limit
 */
LookupLoop:
		andl	%edx, %ecx
		movzwl	(%edi,%ecx,2), %ecx
		cmpl	%ebp, %ecx
		jbe	LeaveNow
		subl	$0x00010000, %edx
		js	LeaveNow
LoopEntry:	movzwl	-1(%esi,%ecx), %eax
		cmpl	%ebx, %eax
		jnz	LookupLoop
		movl	window(%esp), %eax
		movzwl	(%eax,%ecx), %eax
		cmpl	scanstart(%esp), %eax
		jnz	LookupLoop

/* Store the current value of chainlen.					*/

		movl	%edx, chainlenwmask(%esp)

/* Point %edi to the string under scrutiny, and %esi to the string we	*/
/* are hoping to match it up with. In actuality, %esi and %edi are	*/
/* both pointed (MAX_MATCH_8 - scanalign) bytes ahead, and %edx is	*/
/* initialized to -(MAX_MATCH_8 - scanalign).				*/

		movl	window(%esp), %esi
		movl	scan(%esp), %edi
		addl	%ecx, %esi
		movl	scanalign(%esp), %eax
		movl	$(-MAX_MATCH_8), %edx
		lea	MAX_MATCH_8(%edi,%eax), %edi
		lea	MAX_MATCH_8(%esi,%eax), %esi

/* Test the strings for equality, 8 bytes at a time. At the end,
 * adjust %edx so that it is offset to the exact byte that mismatched.
 *
 * We already know at this point that the first three bytes of the
 * strings match each other, and they can be safely passed over before
 * starting the compare loop. So what this code does is skip over 0-3
 * bytes, as much as necessary in order to dword-align the %edi
 * pointer. (%esi will still be misaligned three times out of four.)
 *
 * It should be confessed that this loop usually does not represent
 * much of the total running time. Replacing it with a more
 * straightforward "rep cmpsb" would not drastically degrade
 * performance.
 */
LoopCmps:
		movl	(%esi,%edx), %eax
		xorl	(%edi,%edx), %eax
		jnz	LeaveLoopCmps
		movl	4(%esi,%edx), %eax
		xorl	4(%edi,%edx), %eax
		jnz	LeaveLoopCmps4
		addl	$8, %edx
		jnz	LoopCmps
		jmp	LenMaximum
LeaveLoopCmps4:	addl	$4, %edx
LeaveLoopCmps:	testl	$0x0000FFFF, %eax
		jnz	LenLower
		addl	$2, %edx
		shrl	$16, %eax
LenLower:	subb	$1, %al
		adcl	$0, %edx

/* Calculate the length of the match. If it is longer than MAX_MATCH,	*/
/* then automatically accept it as the best possible match and leave.	*/

		lea	(%edi,%edx), %eax
		movl	scan(%esp), %edi
		subl	%edi, %eax
		cmpl	$MAX_MATCH, %eax
		jge	LenMaximum

/* If the length of the match is not longer than the best match we	*/
/* have so far, then forget it and return to the lookup loop.		*/

		movl	deflatestate(%esp), %edx
		movl	bestlen(%esp), %ebx
		cmpl	%ebx, %eax
		jg	LongerMatch
		movl	windowbestlen(%esp), %esi
		movl	dsPrev(%edx), %edi
		movl	scanend(%esp), %ebx
		movl	chainlenwmask(%esp), %edx
		jmp	LookupLoop

/*         s->match_start = cur_match;					*/
/*         best_len = len;						*/
/*         if (len >= nice_match) break;				*/
/*         scan_end = *(ushf*)(scan+best_len-1);			*/

LongerMatch:	movl	nicematch(%esp), %ebx
		movl	%eax, bestlen(%esp)
		movl	%ecx, dsMatchStart(%edx)
		cmpl	%ebx, %eax
		jge	LeaveNow
		movl	window(%esp), %esi
		addl	%eax, %esi
		movl	%esi, windowbestlen(%esp)
		movzwl	-1(%edi,%eax), %ebx
		movl	dsPrev(%edx), %edi
		movl	%ebx, scanend(%esp)
		movl	chainlenwmask(%esp), %edx
		jmp	LookupLoop

/* Accept the current string, with the maximum possible length.		*/

LenMaximum:	movl	deflatestate(%esp), %edx
		movl	$MAX_MATCH, bestlen(%esp)
		movl	%ecx, dsMatchStart(%edx)

/* if ((uInt)best_len <= s->lookahead) return (uInt)best_len;		*/
/* return s->lookahead;							*/

LeaveNow:
		movl	deflatestate(%esp), %edx
		movl	bestlen(%esp), %ebx
		movl	dsLookahead(%edx), %eax
		cmpl	%eax, %ebx
		jg	LookaheadRet
		movl	%ebx, %eax
LookaheadRet:

/* Restore the stack and return from whence we came.			*/

		addl	$LocalVarsSize, %esp
		.cfi_def_cfa_offset 20
		popl	%ebx
		.cfi_def_cfa_offset 16
		popl	%esi
		.cfi_def_cfa_offset 12
		popl	%edi
		.cfi_def_cfa_offset 8
		popl	%ebp
		.cfi_def_cfa_offset 4
.cfi_endproc
match_init:	ret

       InBytes = number of bytes in InBuf
  Out: OutBuf = ptr to user-allocated buffer to contain decompressed data
       BufSize = number of bytes in OutBuf   }
procedure DecompressToUserBuf(const InBuf: Pointer; InBytes: Integer;
  const OutBuf: Pointer; BufSize: Integer);

const
  zlib_version = '1.2.12';

type
  EZlibError = class(Exception);
  ECompressionError = class(EZlibError);
  EDecompressionError = class(EZlibError);

implementation

        /// </summary>
        /// <param name="data">The data to update the checksum with</param>
        /// <param name="offset">Where in <c>data</c> to start updating</param>
        /// <param name="count">The number of bytes from <c>data</c> to use</param>
        /// <exception cref="ArgumentException">The sum of offset and count is larger than the length of <c>data</c></exception>
        /// <exception cref="NullReferenceException"><c>data</c> is a null reference</exception>
        /// <exception cref="ArgumentOutOfRangeException">Offset or count is negative.</exception>
        /// <remarks>All the other <c>Update</c> methods are implmeneted in terms of this one.
        /// This is therefore the only method a derived class has to implement</remarks>
        public abstract void Update(byte[] data, int offset, int count);

        /// <summary>
        /// Updates the current checksum with an array of bytes.
        /// </summary>
        /// <param name="data">The data to update the checksum with</param>

        /// <summary>
        /// Performs any codec specific cleanup
        /// </summary>
        /// <remarks>This must be implemented by a derived class</remarks>
        protected abstract void CleanUp();

        // performs the release of the handles and calls the dereived CleanUp()
        private void CleanUp(bool isDisposing)
        {
            if (!_isDisposed)
            {
                CleanUp();
                if (_hInput.IsAllocated)
                    _hInput.Free();
                if (_hOutput.IsAllocated)
                    _hOutput.Free();

                _isDisposed = true;
            }
        }


        #endregion

        #region Helper methods

        /// <summary>
        /// Copies a number of bytes to the internal codec buffer - ready for proccesing
        /// </summary>
        /// <param name="data">The byte array that contains the data to copy</param>
        /// <param name="startIndex">The index of the first byte to copy</param>
        /// <param name="count">The number of bytes to copy from <c>data</c></param>
        protected void copyInput(byte[] data, int startIndex, int count)
        {
            Array.Copy(data, startIndex, _inBuffer,0, count);

        /// <exception cref="NotSupportedException">Always thrown</exception>
        public override void SetLength(long value)
        {
            throw new NotSupportedException();
        }

        /// <summary>
        ///  Not suppported.
        /// </summary>
        /// <param name="offset"></param>
        /// <param name="origin"></param>
        /// <returns></returns>
        /// <exception cref="NotSupportedException">Always thrown</exception>
        public override long Seek(long offset, SeekOrigin origin)
        {

        /// flushing may degrade the achievable compression rates.</remarks>
        public override void Flush()
        {
            // left empty on purpose
        }

        /// <summary>
        /// Gets/sets the current position in the <c>GZipStream</c>. Not suppported.
        /// </summary>
        /// <remarks>In this implementation this property is not supported</remarks>
        /// <exception cref="NotSupportedException">Always thrown</exception>
        public override long Position
        {
            get
            {
                throw new NotSupportedException();
            }
            set
            {
                throw new NotSupportedException();
            }
        }

        /// <summary>
        /// Gets the size of the stream. Not suppported.
        /// </summary>
        /// <remarks>In this implementation this property is not supported</remarks>
        /// <exception cref="NotSupportedException">Always thrown</exception>
        public override long Length
        {
            get
            {
                throw new NotSupportedException();
            }
        }
        #endregion
    }
}

    public class InfoTests
    {
        #region Info tests
        [Test]
        public void Info_Version()
        {
            Info info = new Info();
            Assert.AreEqual("1.2.12", Info.Version);
            Assert.AreEqual(32, info.SizeOfUInt);
            Assert.AreEqual(32, info.SizeOfULong);
            Assert.AreEqual(32, info.SizeOfPointer);
            Assert.AreEqual(32, info.SizeOfOffset);
        }
        #endregion
    }

   build.

2. Using NAnt:
   Open a command prompt with access to the build environment and run nant
   in the same directory as the DotZLib.build file.
   You can define 2 properties on the nant command-line to control the build:
   debug={true|false} to toggle between release/debug builds (default=true).
   nunit={true|false} to include or esclude unit tests (default=true).
   Also the target clean will remove binaries.
   Output file (DotZLib.dll) will be found in either ./DotZLib/bin/release
   or ./DotZLib/bin/debug, depending on whether you are building the release
   or debug version of the library.

   Examples:
     nant -D:debug=false -D:nunit=false

/*
   strm provides memory allocation functions in zalloc and zfree, or
   Z_NULL to use the library memory allocation functions.

   window is a user-supplied window and output buffer that is 64K bytes.
 */
int ZEXPORT inflateBack9Init_(strm, window, version, stream_size)
z_stream FAR *strm;
unsigned char FAR *window;
const char *version;
int stream_size;
{
    struct inflate_state FAR *state;

    if (version == Z_NULL || version[0] != ZLIB_VERSION[0] ||
        stream_size != (int)(sizeof(z_stream)))
        return Z_VERSION_ERROR;
    if (strm == Z_NULL || window == Z_NULL)
        return Z_STREAM_ERROR;

/*
   Build and output length and distance decoding tables for fixed code
   decoding.
 */
#ifdef MAKEFIXED
#include <stdio.h>

void makefixed9(void)
{
    unsigned sym, bits, low, size;
    code *next, *lenfix, *distfix;
    struct inflate_state state;
    code fixed[544];

    /* literal/length table */
    sym = 0;

   Z_BUF_ERROR.  strm->next_in can be checked for Z_NULL to see whether it
   was in() or out() that caused in the error.  Otherwise,  inflateBack()
   returns Z_STREAM_END on success, Z_DATA_ERROR for an deflate format
   error, or Z_MEM_ERROR if it could not allocate memory for the state.
   inflateBack() can also return Z_STREAM_ERROR if the input parameters
   are not correct, i.e. strm is Z_NULL or the state was not initialized.
 */
int ZEXPORT inflateBack9(strm, in, in_desc, out, out_desc)
z_stream FAR *strm;
in_func in;
void FAR *in_desc;
out_func out;
void FAR *out_desc;
{
    struct inflate_state FAR *state;
    z_const unsigned char FAR *next;    /* next input */
    unsigned char FAR *put;     /* next output */
    unsigned have;              /* available input */
    unsigned long left;         /* available output */
    inflate_mode mode;          /* current inflate mode */
    int lastblock;              /* true if processing last block */

    /* Return unused input */
  inf_leave:
    strm->next_in = next;
    strm->avail_in = have;
    return ret;
}

int ZEXPORT inflateBack9End(strm)
z_stream FAR *strm;
{
    if (strm == Z_NULL || strm->state == Z_NULL || strm->zfree == (free_func)0)
        return Z_STREAM_ERROR;
    ZFREE(strm, strm->state);
    strm->state = Z_NULL;
    Tracev((stderr, "inflate: end\n"));
    return Z_OK;
}

 * zlib.h must be included before this header file.
 */

#ifdef __cplusplus
extern "C" {
#endif

ZEXTERN int ZEXPORT inflateBack9 OF((z_stream FAR *strm,
                                    in_func in, void FAR *in_desc,
                                    out_func out, void FAR *out_desc));
ZEXTERN int ZEXPORT inflateBack9End OF((z_stream FAR *strm));
ZEXTERN int ZEXPORT inflateBack9Init_ OF((z_stream FAR *strm,
                                         unsigned char FAR *window,
                                         const char *version,
                                         int stream_size));
#define inflateBack9Init(strm, window) \
        inflateBack9Init_((strm), (window), \
        ZLIB_VERSION, sizeof(z_stream))

#ifdef __cplusplus
}
#endif

/* inftree9.c -- generate Huffman trees for efficient decoding
 * Copyright (C) 1995-2022 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */

#include "zutil.h"
#include "inftree9.h"

#define MAXBITS 15

const char inflate9_copyright[] =
   " inflate9 1.2.12 Copyright 1995-2022 Mark Adler ";
/*
  If you use the zlib library in a product, an acknowledgment is welcome
  in the documentation of your product. If for some reason you cannot
  include such an acknowledgment, I would appreciate that you keep this
  copyright string in the executable of your product.
 */

/*
   Build a set of tables to decode the provided canonical Huffman code.
   The code lengths are lens[0..codes-1].  The result starts at *table,
   whose indices are 0..2^bits-1.  work is a writable array of at least
   lens shorts, which is used as a work area.  type is the type of code
   to be generated, CODES, LENS, or DISTS.  On return, zero is success,
   -1 is an invalid code, and +1 means that ENOUGH isn't enough.  table
   on return points to the next available entry's address.  bits is the
   requested root table index bits, and on return it is the actual root
   table index bits.  It will differ if the request is greater than the
   longest code or if it is less than the shortest code.
 */
int inflate_table9(type, lens, codes, table, bits, work)
codetype type;
unsigned short FAR *lens;
unsigned codes;
code FAR * FAR *table;
unsigned FAR *bits;
unsigned short FAR *work;
{
    unsigned len;               /* a code's length in bits */
    unsigned sym;               /* index of code symbols */
    unsigned min, max;          /* minimum and maximum code lengths */
    unsigned root;              /* number of index bits for root table */
    unsigned curr;              /* number of index bits for current table */
    unsigned drop;              /* code bits to drop for sub-table */
    int left;                   /* number of prefix codes available */

    static const unsigned short lbase[31] = { /* Length codes 257..285 base */
        3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17,
        19, 23, 27, 31, 35, 43, 51, 59, 67, 83, 99, 115,
        131, 163, 195, 227, 3, 0, 0};
    static const unsigned short lext[31] = { /* Length codes 257..285 extra */
        128, 128, 128, 128, 128, 128, 128, 128, 129, 129, 129, 129,
        130, 130, 130, 130, 131, 131, 131, 131, 132, 132, 132, 132,
        133, 133, 133, 133, 144, 199, 202};
    static const unsigned short dbase[32] = { /* Distance codes 0..31 base */
        1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49,
        65, 97, 129, 193, 257, 385, 513, 769, 1025, 1537, 2049, 3073,
        4097, 6145, 8193, 12289, 16385, 24577, 32769, 49153};
    static const unsigned short dext[32] = { /* Distance codes 0..31 extra */
        128, 128, 128, 128, 129, 129, 130, 130, 131, 131, 132, 132,
        133, 133, 134, 134, 135, 135, 136, 136, 137, 137, 138, 138,

    01100000 - end of block
    01000000 - invalid code
 */

/* Maximum size of the dynamic table.  The maximum number of code structures is
   1446, which is the sum of 852 for literal/length codes and 594 for distance
   codes.  These values were found by exhaustive searches using the program
   examples/enough.c found in the zlib distribtution.  The arguments to that
   program are the number of symbols, the initial root table size, and the
   maximum bit length of a code.  "enough 286 9 15" for literal/length codes
   returns returns 852, and "enough 32 6 15" for distance codes returns 594.
   The initial root table size (9 or 6) is found in the fifth argument of the
   inflate_table() calls in infback9.c.  If the root table size is changed,
   then these maximum sizes would be need to be recalculated and updated. */
#define ENOUGH_LENS 852
#define ENOUGH_DISTS 594
#define ENOUGH (ENOUGH_LENS+ENOUGH_DISTS)

/* Type of code to build for inflate_table9() */
typedef enum {
    CODES,
    LENS,
    DISTS
} codetype;

extern int inflate_table9 OF((codetype type, unsigned short FAR *lens,
                             unsigned codes, code FAR * FAR *table,
                             unsigned FAR *bits, unsigned short FAR *work));

/* inffas86.c is a hand tuned assembler version of
 *
 * inffast.c -- fast decoding
 * Copyright (C) 1995-2003 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 *
 * Copyright (C) 2003 Chris Anderson <christop@charm.net>
 * Please use the copyright conditions above.
 *
 * Dec-29-2003 -- I added AMD64 inflate asm support.  This version is also
 * slightly quicker on x86 systems because, instead of using rep movsb to copy
 * data, it uses rep movsw, which moves data in 2-byte chunks instead of single
 * bytes.  I've tested the AMD64 code on a Fedora Core 1 + the x86_64 updates
 * from http://fedora.linux.duke.edu/fc1_x86_64
 * which is running on an Athlon 64 3000+ / Gigabyte GA-K8VT800M system with
 * 1GB ram.  The 64-bit version is about 4% faster than the 32-bit version,
 * when decompressing mozilla-source-1.3.tar.gz.
 *
 * Mar-13-2003 -- Most of this is derived from inffast.S which is derived from
 * the gcc -S output of zlib-1.2.0/inffast.c.  Zlib-1.2.0 is in beta release at
 * the moment.  I have successfully compiled and tested this code with gcc2.96,
 * gcc3.2, icc5.0, msvc6.0.  It is very close to the speed of inffast.S
 * compiled with gcc -DNO_MMX, but inffast.S is still faster on the P3 with MMX
 * enabled.  I will attempt to merge the MMX code into this version.  Newer
 * versions of this and inffast.S can be found at
 * http://www.eetbeetee.com/zlib/ and http://www.charm.net/~christop/zlib/
 */

#include "zutil.h"
#include "inftrees.h"
#include "inflate.h"
#include "inffast.h"

/* Mark Adler's comments from inffast.c: */

/*
   Decode literal, length, and distance codes and write out the resulting
   literal and match bytes until either not enough input or output is
   available, an end-of-block is encountered, or a data error is encountered.
   When large enough input and output buffers are supplied to inflate(), for
   example, a 16K input buffer and a 64K output buffer, more than 95% of the
   inflate execution time is spent in this routine.

   Entry assumptions:

        state->mode == LEN
        strm->avail_in >= 6
        strm->avail_out >= 258
        start >= strm->avail_out
        state->bits < 8

   On return, state->mode is one of:

        LEN -- ran out of enough output space or enough available input
        TYPE -- reached end of block code, inflate() to interpret next block
        BAD -- error in block data

   Notes:

    - The maximum input bits used by a length/distance pair is 15 bits for the
      length code, 5 bits for the length extra, 15 bits for the distance code,
      and 13 bits for the distance extra.  This totals 48 bits, or six bytes.
      Therefore if strm->avail_in >= 6, then there is enough input to avoid
      checking for available input while decoding.

    - The maximum bytes that a single length/distance pair can output is 258
      bytes, which is the maximum length that can be coded.  inflate_fast()
      requires strm->avail_out >= 258 for each loop to avoid checking for
      output space.
 */
void inflate_fast(strm, start)
z_streamp strm;
unsigned start;         /* inflate()'s starting value for strm->avail_out */
{
    struct inflate_state FAR *state;
    struct inffast_ar {
/* 64   32                               x86  x86_64 */
/* ar offset                              register */
/*  0    0 */ void *esp;                /* esp save */
/*  8    4 */ void *ebp;                /* ebp save */
/* 16    8 */ unsigned char FAR *in;    /* esi rsi  local strm->next_in */
/* 24   12 */ unsigned char FAR *last;  /*     r9   while in < last */
/* 32   16 */ unsigned char FAR *out;   /* edi rdi  local strm->next_out */
/* 40   20 */ unsigned char FAR *beg;   /*          inflate()'s init next_out */
/* 48   24 */ unsigned char FAR *end;   /*     r10  while out < end */
/* 56   28 */ unsigned char FAR *window;/*          size of window, wsize!=0 */
/* 64   32 */ code const FAR *lcode;    /* ebp rbp  local strm->lencode */
/* 72   36 */ code const FAR *dcode;    /*     r11  local strm->distcode */
/* 80   40 */ unsigned long hold;       /* edx rdx  local strm->hold */
/* 88   44 */ unsigned bits;            /* ebx rbx  local strm->bits */
/* 92   48 */ unsigned wsize;           /*          window size */
/* 96   52 */ unsigned write;           /*          window write index */
/*100   56 */ unsigned lmask;           /*     r12  mask for lcode */
/*104   60 */ unsigned dmask;           /*     r13  mask for dcode */
/*108   64 */ unsigned len;             /*     r14  match length */
/*112   68 */ unsigned dist;            /*     r15  match distance */
/*116   72 */ unsigned status;          /*          set when state chng*/
    } ar;

#if defined( __GNUC__ ) && defined( __amd64__ ) && ! defined( __i386 )
#define PAD_AVAIL_IN 6
#define PAD_AVAIL_OUT 258
#else
#define PAD_AVAIL_IN 5
#define PAD_AVAIL_OUT 257
#endif

    /* copy state to local variables */
    state = (struct inflate_state FAR *)strm->state;
    ar.in = strm->next_in;
    ar.last = ar.in + (strm->avail_in - PAD_AVAIL_IN);
    ar.out = strm->next_out;
    ar.beg = ar.out - (start - strm->avail_out);
    ar.end = ar.out + (strm->avail_out - PAD_AVAIL_OUT);
    ar.wsize = state->wsize;
    ar.write = state->wnext;
    ar.window = state->window;
    ar.hold = state->hold;
    ar.bits = state->bits;
    ar.lcode = state->lencode;
    ar.dcode = state->distcode;
    ar.lmask = (1U << state->lenbits) - 1;
    ar.dmask = (1U << state->distbits) - 1;

    /* decode literals and length/distances until end-of-block or not enough
       input data or output space */

    /* align in on 1/2 hold size boundary */
    while (((unsigned long)(void *)ar.in & (sizeof(ar.hold) / 2 - 1)) != 0) {
        ar.hold += (unsigned long)*ar.in++ << ar.bits;
        ar.bits += 8;
    }

#if defined( __GNUC__ ) && defined( __amd64__ ) && ! defined( __i386 )
    __asm__ __volatile__ (
"        leaq    %0, %%rax\n"
"        movq    %%rbp, 8(%%rax)\n"       /* save regs rbp and rsp */
"        movq    %%rsp, (%%rax)\n"
"        movq    %%rax, %%rsp\n"          /* make rsp point to &ar */
"        movq    16(%%rsp), %%rsi\n"      /* rsi  = in */
"        movq    32(%%rsp), %%rdi\n"      /* rdi  = out */
"        movq    24(%%rsp), %%r9\n"       /* r9   = last */
"        movq    48(%%rsp), %%r10\n"      /* r10  = end */
"        movq    64(%%rsp), %%rbp\n"      /* rbp  = lcode */
"        movq    72(%%rsp), %%r11\n"      /* r11  = dcode */
"        movq    80(%%rsp), %%rdx\n"      /* rdx  = hold */
"        movl    88(%%rsp), %%ebx\n"      /* ebx  = bits */
"        movl    100(%%rsp), %%r12d\n"    /* r12d = lmask */
"        movl    104(%%rsp), %%r13d\n"    /* r13d = dmask */
                                          /* r14d = len */
                                          /* r15d = dist */
"        cld\n"
"        cmpq    %%rdi, %%r10\n"
"        je      .L_one_time\n"           /* if only one decode left */
"        cmpq    %%rsi, %%r9\n"
"        je      .L_one_time\n"
"        jmp     .L_do_loop\n"

".L_one_time:\n"
"        movq    %%r12, %%r8\n"           /* r8 = lmask */
"        cmpb    $32, %%bl\n"
"        ja      .L_get_length_code_one_time\n"

"        lodsl\n"                         /* eax = *(uint *)in++ */
"        movb    %%bl, %%cl\n"            /* cl = bits, needs it for shifting */
"        addb    $32, %%bl\n"             /* bits += 32 */
"        shlq    %%cl, %%rax\n"
"        orq     %%rax, %%rdx\n"          /* hold |= *((uint *)in)++ << bits */
"        jmp     .L_get_length_code_one_time\n"

".align 32,0x90\n"
".L_while_test:\n"
"        cmpq    %%rdi, %%r10\n"
"        jbe     .L_break_loop\n"
"        cmpq    %%rsi, %%r9\n"
"        jbe     .L_break_loop\n"

".L_do_loop:\n"
"        movq    %%r12, %%r8\n"           /* r8 = lmask */
"        cmpb    $32, %%bl\n"
"        ja      .L_get_length_code\n"    /* if (32 < bits) */

"        lodsl\n"                         /* eax = *(uint *)in++ */
"        movb    %%bl, %%cl\n"            /* cl = bits, needs it for shifting */
"        addb    $32, %%bl\n"             /* bits += 32 */
"        shlq    %%cl, %%rax\n"
"        orq     %%rax, %%rdx\n"          /* hold |= *((uint *)in)++ << bits */

".L_get_length_code:\n"
"        andq    %%rdx, %%r8\n"            /* r8 &= hold */
"        movl    (%%rbp,%%r8,4), %%eax\n"  /* eax = lcode[hold & lmask] */

"        movb    %%ah, %%cl\n"            /* cl = this.bits */
"        subb    %%ah, %%bl\n"            /* bits -= this.bits */
"        shrq    %%cl, %%rdx\n"           /* hold >>= this.bits */

"        testb   %%al, %%al\n"
"        jnz     .L_test_for_length_base\n" /* if (op != 0) 45.7% */

"        movq    %%r12, %%r8\n"            /* r8 = lmask */
"        shrl    $16, %%eax\n"            /* output this.val char */
"        stosb\n"

".L_get_length_code_one_time:\n"
"        andq    %%rdx, %%r8\n"            /* r8 &= hold */
"        movl    (%%rbp,%%r8,4), %%eax\n" /* eax = lcode[hold & lmask] */

".L_dolen:\n"
"        movb    %%ah, %%cl\n"            /* cl = this.bits */
"        subb    %%ah, %%bl\n"            /* bits -= this.bits */
"        shrq    %%cl, %%rdx\n"           /* hold >>= this.bits */

"        testb   %%al, %%al\n"
"        jnz     .L_test_for_length_base\n" /* if (op != 0) 45.7% */

"        shrl    $16, %%eax\n"            /* output this.val char */
"        stosb\n"
"        jmp     .L_while_test\n"

".align 32,0x90\n"
".L_test_for_length_base:\n"
"        movl    %%eax, %%r14d\n"         /* len = this */
"        shrl    $16, %%r14d\n"           /* len = this.val */
"        movb    %%al, %%cl\n"

"        testb   $16, %%al\n"
"        jz      .L_test_for_second_level_length\n" /* if ((op & 16) == 0) 8% */
"        andb    $15, %%cl\n"             /* op &= 15 */
"        jz      .L_decode_distance\n"    /* if (!op) */

".L_add_bits_to_len:\n"
"        subb    %%cl, %%bl\n"
"        xorl    %%eax, %%eax\n"
"        incl    %%eax\n"
"        shll    %%cl, %%eax\n"
"        decl    %%eax\n"
"        andl    %%edx, %%eax\n"          /* eax &= hold */
"        shrq    %%cl, %%rdx\n"
"        addl    %%eax, %%r14d\n"         /* len += hold & mask[op] */

".L_decode_distance:\n"
"        movq    %%r13, %%r8\n"           /* r8 = dmask */
"        cmpb    $32, %%bl\n"
"        ja      .L_get_distance_code\n"  /* if (32 < bits) */

"        lodsl\n"                         /* eax = *(uint *)in++ */
"        movb    %%bl, %%cl\n"            /* cl = bits, needs it for shifting */
"        addb    $32, %%bl\n"             /* bits += 32 */
"        shlq    %%cl, %%rax\n"
"        orq     %%rax, %%rdx\n"          /* hold |= *((uint *)in)++ << bits */

".L_get_distance_code:\n"
"        andq    %%rdx, %%r8\n"           /* r8 &= hold */
"        movl    (%%r11,%%r8,4), %%eax\n" /* eax = dcode[hold & dmask] */

".L_dodist:\n"
"        movl    %%eax, %%r15d\n"         /* dist = this */
"        shrl    $16, %%r15d\n"           /* dist = this.val */
"        movb    %%ah, %%cl\n"
"        subb    %%ah, %%bl\n"            /* bits -= this.bits */
"        shrq    %%cl, %%rdx\n"           /* hold >>= this.bits */
"        movb    %%al, %%cl\n"            /* cl = this.op */

"        testb   $16, %%al\n"             /* if ((op & 16) == 0) */
"        jz      .L_test_for_second_level_dist\n"
"        andb    $15, %%cl\n"             /* op &= 15 */
"        jz      .L_check_dist_one\n"

".L_add_bits_to_dist:\n"
"        subb    %%cl, %%bl\n"
"        xorl    %%eax, %%eax\n"
"        incl    %%eax\n"
"        shll    %%cl, %%eax\n"
"        decl    %%eax\n"                 /* (1 << op) - 1 */
"        andl    %%edx, %%eax\n"          /* eax &= hold */
"        shrq    %%cl, %%rdx\n"
"        addl    %%eax, %%r15d\n"         /* dist += hold & ((1 << op) - 1) */

".L_check_window:\n"
"        movq    %%rsi, %%r8\n"           /* save in so from can use it's reg */
"        movq    %%rdi, %%rax\n"
"        subq    40(%%rsp), %%rax\n"      /* nbytes = out - beg */

"        cmpl    %%r15d, %%eax\n"
"        jb      .L_clip_window\n"        /* if (dist > nbytes) 4.2% */

"        movl    %%r14d, %%ecx\n"         /* ecx = len */
"        movq    %%rdi, %%rsi\n"
"        subq    %%r15, %%rsi\n"          /* from = out - dist */

"        sarl    %%ecx\n"
"        jnc     .L_copy_two\n"           /* if len % 2 == 0 */

"        rep     movsw\n"
"        movb    (%%rsi), %%al\n"
"        movb    %%al, (%%rdi)\n"
"        incq    %%rdi\n"

"        movq    %%r8, %%rsi\n"           /* move in back to %rsi, toss from */
"        jmp     .L_while_test\n"

".L_copy_two:\n"
"        rep     movsw\n"
"        movq    %%r8, %%rsi\n"           /* move in back to %rsi, toss from */
"        jmp     .L_while_test\n"

".align 32,0x90\n"
".L_check_dist_one:\n"
"        cmpl    $1, %%r15d\n"            /* if dist 1, is a memset */
"        jne     .L_check_window\n"
"        cmpq    %%rdi, 40(%%rsp)\n"      /* if out == beg, outside window */
"        je      .L_check_window\n"

"        movl    %%r14d, %%ecx\n"         /* ecx = len */
"        movb    -1(%%rdi), %%al\n"
"        movb    %%al, %%ah\n"

"        sarl    %%ecx\n"
"        jnc     .L_set_two\n"
"        movb    %%al, (%%rdi)\n"
"        incq    %%rdi\n"

".L_set_two:\n"
"        rep     stosw\n"
"        jmp     .L_while_test\n"

".align 32,0x90\n"
".L_test_for_second_level_length:\n"
"        testb   $64, %%al\n"
"        jnz     .L_test_for_end_of_block\n" /* if ((op & 64) != 0) */

"        xorl    %%eax, %%eax\n"
"        incl    %%eax\n"
"        shll    %%cl, %%eax\n"
"        decl    %%eax\n"
"        andl    %%edx, %%eax\n"         /* eax &= hold */
"        addl    %%r14d, %%eax\n"        /* eax += len */
"        movl    (%%rbp,%%rax,4), %%eax\n" /* eax = lcode[val+(hold&mask[op])]*/
"        jmp     .L_dolen\n"

".align 32,0x90\n"
".L_test_for_second_level_dist:\n"
"        testb   $64, %%al\n"
"        jnz     .L_invalid_distance_code\n" /* if ((op & 64) != 0) */

"        xorl    %%eax, %%eax\n"
"        incl    %%eax\n"
"        shll    %%cl, %%eax\n"
"        decl    %%eax\n"
"        andl    %%edx, %%eax\n"         /* eax &= hold */
"        addl    %%r15d, %%eax\n"        /* eax += dist */
"        movl    (%%r11,%%rax,4), %%eax\n" /* eax = dcode[val+(hold&mask[op])]*/
"        jmp     .L_dodist\n"

".align 32,0x90\n"
".L_clip_window:\n"
"        movl    %%eax, %%ecx\n"         /* ecx = nbytes */
"        movl    92(%%rsp), %%eax\n"     /* eax = wsize, prepare for dist cmp */
"        negl    %%ecx\n"                /* nbytes = -nbytes */

"        cmpl    %%r15d, %%eax\n"
"        jb      .L_invalid_distance_too_far\n" /* if (dist > wsize) */

"        addl    %%r15d, %%ecx\n"         /* nbytes = dist - nbytes */
"        cmpl    $0, 96(%%rsp)\n"
"        jne     .L_wrap_around_window\n" /* if (write != 0) */

"        movq    56(%%rsp), %%rsi\n"     /* from  = window */
"        subl    %%ecx, %%eax\n"         /* eax  -= nbytes */
"        addq    %%rax, %%rsi\n"         /* from += wsize - nbytes */

"        movl    %%r14d, %%eax\n"        /* eax = len */
"        cmpl    %%ecx, %%r14d\n"
"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */

"        subl    %%ecx, %%eax\n"         /* eax -= nbytes */
"        rep     movsb\n"
"        movq    %%rdi, %%rsi\n"
"        subq    %%r15, %%rsi\n"         /* from = &out[ -dist ] */
"        jmp     .L_do_copy\n"

".align 32,0x90\n"
".L_wrap_around_window:\n"
"        movl    96(%%rsp), %%eax\n"     /* eax = write */
"        cmpl    %%eax, %%ecx\n"
"        jbe     .L_contiguous_in_window\n" /* if (write >= nbytes) */

"        movl    92(%%rsp), %%esi\n"     /* from  = wsize */
"        addq    56(%%rsp), %%rsi\n"     /* from += window */
"        addq    %%rax, %%rsi\n"         /* from += write */
"        subq    %%rcx, %%rsi\n"         /* from -= nbytes */
"        subl    %%eax, %%ecx\n"         /* nbytes -= write */

"        movl    %%r14d, %%eax\n"        /* eax = len */
"        cmpl    %%ecx, %%eax\n"
"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */

"        subl    %%ecx, %%eax\n"         /* len -= nbytes */
"        rep     movsb\n"
"        movq    56(%%rsp), %%rsi\n"     /* from = window */
"        movl    96(%%rsp), %%ecx\n"     /* nbytes = write */
"        cmpl    %%ecx, %%eax\n"
"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */

"        subl    %%ecx, %%eax\n"         /* len -= nbytes */
"        rep     movsb\n"
"        movq    %%rdi, %%rsi\n"
"        subq    %%r15, %%rsi\n"         /* from = out - dist */
"        jmp     .L_do_copy\n"

".align 32,0x90\n"
".L_contiguous_in_window:\n"
"        movq    56(%%rsp), %%rsi\n"     /* rsi = window */
"        addq    %%rax, %%rsi\n"
"        subq    %%rcx, %%rsi\n"         /* from += write - nbytes */

"        movl    %%r14d, %%eax\n"        /* eax = len */
"        cmpl    %%ecx, %%eax\n"
"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */

"        subl    %%ecx, %%eax\n"         /* len -= nbytes */
"        rep     movsb\n"
"        movq    %%rdi, %%rsi\n"
"        subq    %%r15, %%rsi\n"         /* from = out - dist */
"        jmp     .L_do_copy\n"           /* if (nbytes >= len) */

".align 32,0x90\n"
".L_do_copy:\n"
"        movl    %%eax, %%ecx\n"         /* ecx = len */
"        rep     movsb\n"

"        movq    %%r8, %%rsi\n"          /* move in back to %esi, toss from */
"        jmp     .L_while_test\n"

".L_test_for_end_of_block:\n"
"        testb   $32, %%al\n"
"        jz      .L_invalid_literal_length_code\n"
"        movl    $1, 116(%%rsp)\n"
"        jmp     .L_break_loop_with_status\n"

".L_invalid_literal_length_code:\n"
"        movl    $2, 116(%%rsp)\n"
"        jmp     .L_break_loop_with_status\n"

".L_invalid_distance_code:\n"
"        movl    $3, 116(%%rsp)\n"
"        jmp     .L_break_loop_with_status\n"

".L_invalid_distance_too_far:\n"
"        movl    $4, 116(%%rsp)\n"
"        jmp     .L_break_loop_with_status\n"

".L_break_loop:\n"
"        movl    $0, 116(%%rsp)\n"

".L_break_loop_with_status:\n"
/* put in, out, bits, and hold back into ar and pop esp */
"        movq    %%rsi, 16(%%rsp)\n"     /* in */
"        movq    %%rdi, 32(%%rsp)\n"     /* out */
"        movl    %%ebx, 88(%%rsp)\n"     /* bits */
"        movq    %%rdx, 80(%%rsp)\n"     /* hold */
"        movq    (%%rsp), %%rax\n"       /* restore rbp and rsp */
"        movq    8(%%rsp), %%rbp\n"
"        movq    %%rax, %%rsp\n"
          :
          : "m" (ar)
          : "memory", "%rax", "%rbx", "%rcx", "%rdx", "%rsi", "%rdi",
            "%r8", "%r9", "%r10", "%r11", "%r12", "%r13", "%r14", "%r15"
    );
#elif ( defined( __GNUC__ ) || defined( __ICC ) ) && defined( __i386 )
    __asm__ __volatile__ (
"        leal    %0, %%eax\n"
"        movl    %%esp, (%%eax)\n"        /* save esp, ebp */
"        movl    %%ebp, 4(%%eax)\n"
"        movl    %%eax, %%esp\n"
"        movl    8(%%esp), %%esi\n"       /* esi = in */
"        movl    16(%%esp), %%edi\n"      /* edi = out */
"        movl    40(%%esp), %%edx\n"      /* edx = hold */
"        movl    44(%%esp), %%ebx\n"      /* ebx = bits */
"        movl    32(%%esp), %%ebp\n"      /* ebp = lcode */

"        cld\n"
"        jmp     .L_do_loop\n"

".align 32,0x90\n"
".L_while_test:\n"
"        cmpl    %%edi, 24(%%esp)\n"      /* out < end */
"        jbe     .L_break_loop\n"
"        cmpl    %%esi, 12(%%esp)\n"      /* in < last */
"        jbe     .L_break_loop\n"

".L_do_loop:\n"
"        cmpb    $15, %%bl\n"
"        ja      .L_get_length_code\n"    /* if (15 < bits) */

"        xorl    %%eax, %%eax\n"
"        lodsw\n"                         /* al = *(ushort *)in++ */
"        movb    %%bl, %%cl\n"            /* cl = bits, needs it for shifting */
"        addb    $16, %%bl\n"             /* bits += 16 */
"        shll    %%cl, %%eax\n"
"        orl     %%eax, %%edx\n"        /* hold |= *((ushort *)in)++ << bits */

".L_get_length_code:\n"
"        movl    56(%%esp), %%eax\n"      /* eax = lmask */
"        andl    %%edx, %%eax\n"          /* eax &= hold */
"        movl    (%%ebp,%%eax,4), %%eax\n" /* eax = lcode[hold & lmask] */

".L_dolen:\n"
"        movb    %%ah, %%cl\n"            /* cl = this.bits */
"        subb    %%ah, %%bl\n"            /* bits -= this.bits */
"        shrl    %%cl, %%edx\n"           /* hold >>= this.bits */

"        testb   %%al, %%al\n"
"        jnz     .L_test_for_length_base\n" /* if (op != 0) 45.7% */

"        shrl    $16, %%eax\n"            /* output this.val char */
"        stosb\n"
"        jmp     .L_while_test\n"

".align 32,0x90\n"
".L_test_for_length_base:\n"
"        movl    %%eax, %%ecx\n"          /* len = this */
"        shrl    $16, %%ecx\n"            /* len = this.val */
"        movl    %%ecx, 64(%%esp)\n"      /* save len */
"        movb    %%al, %%cl\n"

"        testb   $16, %%al\n"
"        jz      .L_test_for_second_level_length\n" /* if ((op & 16) == 0) 8% */
"        andb    $15, %%cl\n"             /* op &= 15 */
"        jz      .L_decode_distance\n"    /* if (!op) */
"        cmpb    %%cl, %%bl\n"
"        jae     .L_add_bits_to_len\n"    /* if (op <= bits) */

"        movb    %%cl, %%ch\n"            /* stash op in ch, freeing cl */
"        xorl    %%eax, %%eax\n"
"        lodsw\n"                         /* al = *(ushort *)in++ */
"        movb    %%bl, %%cl\n"            /* cl = bits, needs it for shifting */
"        addb    $16, %%bl\n"             /* bits += 16 */
"        shll    %%cl, %%eax\n"
"        orl     %%eax, %%edx\n"         /* hold |= *((ushort *)in)++ << bits */
"        movb    %%ch, %%cl\n"            /* move op back to ecx */

".L_add_bits_to_len:\n"
"        subb    %%cl, %%bl\n"
"        xorl    %%eax, %%eax\n"
"        incl    %%eax\n"
"        shll    %%cl, %%eax\n"
"        decl    %%eax\n"
"        andl    %%edx, %%eax\n"          /* eax &= hold */
"        shrl    %%cl, %%edx\n"
"        addl    %%eax, 64(%%esp)\n"      /* len += hold & mask[op] */

".L_decode_distance:\n"
"        cmpb    $15, %%bl\n"
"        ja      .L_get_distance_code\n"  /* if (15 < bits) */

"        xorl    %%eax, %%eax\n"
"        lodsw\n"                         /* al = *(ushort *)in++ */
"        movb    %%bl, %%cl\n"            /* cl = bits, needs it for shifting */
"        addb    $16, %%bl\n"             /* bits += 16 */
"        shll    %%cl, %%eax\n"
"        orl     %%eax, %%edx\n"         /* hold |= *((ushort *)in)++ << bits */

".L_get_distance_code:\n"
"        movl    60(%%esp), %%eax\n"      /* eax = dmask */
"        movl    36(%%esp), %%ecx\n"      /* ecx = dcode */
"        andl    %%edx, %%eax\n"          /* eax &= hold */
"        movl    (%%ecx,%%eax,4), %%eax\n"/* eax = dcode[hold & dmask] */

".L_dodist:\n"
"        movl    %%eax, %%ebp\n"          /* dist = this */
"        shrl    $16, %%ebp\n"            /* dist = this.val */
"        movb    %%ah, %%cl\n"
"        subb    %%ah, %%bl\n"            /* bits -= this.bits */
"        shrl    %%cl, %%edx\n"           /* hold >>= this.bits */
"        movb    %%al, %%cl\n"            /* cl = this.op */

"        testb   $16, %%al\n"             /* if ((op & 16) == 0) */
"        jz      .L_test_for_second_level_dist\n"
"        andb    $15, %%cl\n"             /* op &= 15 */
"        jz      .L_check_dist_one\n"
"        cmpb    %%cl, %%bl\n"
"        jae     .L_add_bits_to_dist\n"   /* if (op <= bits) 97.6% */

"        movb    %%cl, %%ch\n"            /* stash op in ch, freeing cl */
"        xorl    %%eax, %%eax\n"
"        lodsw\n"                         /* al = *(ushort *)in++ */
"        movb    %%bl, %%cl\n"            /* cl = bits, needs it for shifting */
"        addb    $16, %%bl\n"             /* bits += 16 */
"        shll    %%cl, %%eax\n"
"        orl     %%eax, %%edx\n"        /* hold |= *((ushort *)in)++ << bits */
"        movb    %%ch, %%cl\n"            /* move op back to ecx */

".L_add_bits_to_dist:\n"
"        subb    %%cl, %%bl\n"
"        xorl    %%eax, %%eax\n"
"        incl    %%eax\n"
"        shll    %%cl, %%eax\n"
"        decl    %%eax\n"                 /* (1 << op) - 1 */
"        andl    %%edx, %%eax\n"          /* eax &= hold */
"        shrl    %%cl, %%edx\n"
"        addl    %%eax, %%ebp\n"          /* dist += hold & ((1 << op) - 1) */

".L_check_window:\n"
"        movl    %%esi, 8(%%esp)\n"       /* save in so from can use it's reg */
"        movl    %%edi, %%eax\n"
"        subl    20(%%esp), %%eax\n"      /* nbytes = out - beg */

"        cmpl    %%ebp, %%eax\n"
"        jb      .L_clip_window\n"        /* if (dist > nbytes) 4.2% */

"        movl    64(%%esp), %%ecx\n"      /* ecx = len */
"        movl    %%edi, %%esi\n"
"        subl    %%ebp, %%esi\n"          /* from = out - dist */

"        sarl    %%ecx\n"
"        jnc     .L_copy_two\n"           /* if len % 2 == 0 */

"        rep     movsw\n"
"        movb    (%%esi), %%al\n"
"        movb    %%al, (%%edi)\n"
"        incl    %%edi\n"

"        movl    8(%%esp), %%esi\n"       /* move in back to %esi, toss from */
"        movl    32(%%esp), %%ebp\n"      /* ebp = lcode */
"        jmp     .L_while_test\n"

".L_copy_two:\n"
"        rep     movsw\n"
"        movl    8(%%esp), %%esi\n"       /* move in back to %esi, toss from */
"        movl    32(%%esp), %%ebp\n"      /* ebp = lcode */
"        jmp     .L_while_test\n"

".align 32,0x90\n"
".L_check_dist_one:\n"
"        cmpl    $1, %%ebp\n"            /* if dist 1, is a memset */
"        jne     .L_check_window\n"
"        cmpl    %%edi, 20(%%esp)\n"
"        je      .L_check_window\n"      /* out == beg, if outside window */

"        movl    64(%%esp), %%ecx\n"      /* ecx = len */
"        movb    -1(%%edi), %%al\n"
"        movb    %%al, %%ah\n"

"        sarl    %%ecx\n"
"        jnc     .L_set_two\n"
"        movb    %%al, (%%edi)\n"
"        incl    %%edi\n"

".L_set_two:\n"
"        rep     stosw\n"
"        movl    32(%%esp), %%ebp\n"      /* ebp = lcode */
"        jmp     .L_while_test\n"

".align 32,0x90\n"
".L_test_for_second_level_length:\n"
"        testb   $64, %%al\n"
"        jnz     .L_test_for_end_of_block\n" /* if ((op & 64) != 0) */

"        xorl    %%eax, %%eax\n"
"        incl    %%eax\n"
"        shll    %%cl, %%eax\n"
"        decl    %%eax\n"
"        andl    %%edx, %%eax\n"         /* eax &= hold */
"        addl    64(%%esp), %%eax\n"     /* eax += len */
"        movl    (%%ebp,%%eax,4), %%eax\n" /* eax = lcode[val+(hold&mask[op])]*/
"        jmp     .L_dolen\n"

".align 32,0x90\n"
".L_test_for_second_level_dist:\n"
"        testb   $64, %%al\n"
"        jnz     .L_invalid_distance_code\n" /* if ((op & 64) != 0) */

"        xorl    %%eax, %%eax\n"
"        incl    %%eax\n"
"        shll    %%cl, %%eax\n"
"        decl    %%eax\n"
"        andl    %%edx, %%eax\n"         /* eax &= hold */
"        addl    %%ebp, %%eax\n"         /* eax += dist */
"        movl    36(%%esp), %%ecx\n"     /* ecx = dcode */
"        movl    (%%ecx,%%eax,4), %%eax\n" /* eax = dcode[val+(hold&mask[op])]*/
"        jmp     .L_dodist\n"

".align 32,0x90\n"
".L_clip_window:\n"
"        movl    %%eax, %%ecx\n"
"        movl    48(%%esp), %%eax\n"     /* eax = wsize */
"        negl    %%ecx\n"                /* nbytes = -nbytes */
"        movl    28(%%esp), %%esi\n"     /* from = window */

"        cmpl    %%ebp, %%eax\n"
"        jb      .L_invalid_distance_too_far\n" /* if (dist > wsize) */

"        addl    %%ebp, %%ecx\n"         /* nbytes = dist - nbytes */
"        cmpl    $0, 52(%%esp)\n"
"        jne     .L_wrap_around_window\n" /* if (write != 0) */

"        subl    %%ecx, %%eax\n"
"        addl    %%eax, %%esi\n"         /* from += wsize - nbytes */

"        movl    64(%%esp), %%eax\n"     /* eax = len */
"        cmpl    %%ecx, %%eax\n"
"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */

"        subl    %%ecx, %%eax\n"         /* len -= nbytes */
"        rep     movsb\n"
"        movl    %%edi, %%esi\n"
"        subl    %%ebp, %%esi\n"         /* from = out - dist */
"        jmp     .L_do_copy\n"

".align 32,0x90\n"
".L_wrap_around_window:\n"
"        movl    52(%%esp), %%eax\n"     /* eax = write */
"        cmpl    %%eax, %%ecx\n"
"        jbe     .L_contiguous_in_window\n" /* if (write >= nbytes) */

"        addl    48(%%esp), %%esi\n"     /* from += wsize */
"        addl    %%eax, %%esi\n"         /* from += write */
"        subl    %%ecx, %%esi\n"         /* from -= nbytes */
"        subl    %%eax, %%ecx\n"         /* nbytes -= write */

"        movl    64(%%esp), %%eax\n"     /* eax = len */
"        cmpl    %%ecx, %%eax\n"
"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */

"        subl    %%ecx, %%eax\n"         /* len -= nbytes */
"        rep     movsb\n"
"        movl    28(%%esp), %%esi\n"     /* from = window */
"        movl    52(%%esp), %%ecx\n"     /* nbytes = write */
"        cmpl    %%ecx, %%eax\n"
"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */

"        subl    %%ecx, %%eax\n"         /* len -= nbytes */
"        rep     movsb\n"
"        movl    %%edi, %%esi\n"
"        subl    %%ebp, %%esi\n"         /* from = out - dist */
"        jmp     .L_do_copy\n"

".align 32,0x90\n"
".L_contiguous_in_window:\n"
"        addl    %%eax, %%esi\n"
"        subl    %%ecx, %%esi\n"         /* from += write - nbytes */

"        movl    64(%%esp), %%eax\n"     /* eax = len */
"        cmpl    %%ecx, %%eax\n"
"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */

"        subl    %%ecx, %%eax\n"         /* len -= nbytes */
"        rep     movsb\n"
"        movl    %%edi, %%esi\n"
"        subl    %%ebp, %%esi\n"         /* from = out - dist */
"        jmp     .L_do_copy\n"           /* if (nbytes >= len) */

".align 32,0x90\n"
".L_do_copy:\n"
"        movl    %%eax, %%ecx\n"
"        rep     movsb\n"

"        movl    8(%%esp), %%esi\n"      /* move in back to %esi, toss from */
"        movl    32(%%esp), %%ebp\n"     /* ebp = lcode */
"        jmp     .L_while_test\n"

".L_test_for_end_of_block:\n"
"        testb   $32, %%al\n"
"        jz      .L_invalid_literal_length_code\n"
"        movl    $1, 72(%%esp)\n"
"        jmp     .L_break_loop_with_status\n"

".L_invalid_literal_length_code:\n"
"        movl    $2, 72(%%esp)\n"
"        jmp     .L_break_loop_with_status\n"

".L_invalid_distance_code:\n"
"        movl    $3, 72(%%esp)\n"
"        jmp     .L_break_loop_with_status\n"

".L_invalid_distance_too_far:\n"
"        movl    8(%%esp), %%esi\n"
"        movl    $4, 72(%%esp)\n"
"        jmp     .L_break_loop_with_status\n"

".L_break_loop:\n"
"        movl    $0, 72(%%esp)\n"

".L_break_loop_with_status:\n"
/* put in, out, bits, and hold back into ar and pop esp */
"        movl    %%esi, 8(%%esp)\n"      /* save in */
"        movl    %%edi, 16(%%esp)\n"     /* save out */
"        movl    %%ebx, 44(%%esp)\n"     /* save bits */
"        movl    %%edx, 40(%%esp)\n"     /* save hold */
"        movl    4(%%esp), %%ebp\n"      /* restore esp, ebp */
"        movl    (%%esp), %%esp\n"
          :
          : "m" (ar)
          : "memory", "%eax", "%ebx", "%ecx", "%edx", "%esi", "%edi"
    );
#elif defined( _MSC_VER ) && ! defined( _M_AMD64 )
    __asm {
	lea	eax, ar
	mov	[eax], esp         /* save esp, ebp */
	mov	[eax+4], ebp
	mov	esp, eax
	mov	esi, [esp+8]       /* esi = in */
	mov	edi, [esp+16]      /* edi = out */
	mov	edx, [esp+40]      /* edx = hold */
	mov	ebx, [esp+44]      /* ebx = bits */
	mov	ebp, [esp+32]      /* ebp = lcode */

	cld
	jmp	L_do_loop

ALIGN 4
L_while_test:
	cmp	[esp+24], edi
	jbe	L_break_loop
	cmp	[esp+12], esi
	jbe	L_break_loop

L_do_loop:
	cmp	bl, 15
	ja	L_get_length_code    /* if (15 < bits) */

	xor	eax, eax
	lodsw                         /* al = *(ushort *)in++ */
	mov	cl, bl            /* cl = bits, needs it for shifting */
	add	bl, 16             /* bits += 16 */
	shl	eax, cl
	or	edx, eax        /* hold |= *((ushort *)in)++ << bits */

L_get_length_code:
	mov	eax, [esp+56]      /* eax = lmask */
	and	eax, edx          /* eax &= hold */
	mov	eax, [ebp+eax*4] /* eax = lcode[hold & lmask] */

L_dolen:
	mov	cl, ah            /* cl = this.bits */
	sub	bl, ah            /* bits -= this.bits */
	shr	edx, cl           /* hold >>= this.bits */

	test	al, al
	jnz	L_test_for_length_base /* if (op != 0) 45.7% */

	shr	eax, 16            /* output this.val char */
	stosb
	jmp	L_while_test

ALIGN 4
L_test_for_length_base:
	mov	ecx, eax          /* len = this */
	shr	ecx, 16            /* len = this.val */
	mov	[esp+64], ecx      /* save len */
	mov	cl, al

	test	al, 16
	jz	L_test_for_second_level_length /* if ((op & 16) == 0) 8% */
	and	cl, 15             /* op &= 15 */
	jz	L_decode_distance    /* if (!op) */
	cmp	bl, cl
	jae	L_add_bits_to_len    /* if (op <= bits) */

	mov	ch, cl            /* stash op in ch, freeing cl */
	xor	eax, eax
	lodsw                         /* al = *(ushort *)in++ */
	mov	cl, bl            /* cl = bits, needs it for shifting */
	add	bl, 16             /* bits += 16 */
	shl	eax, cl
	or	edx, eax         /* hold |= *((ushort *)in)++ << bits */
	mov	cl, ch            /* move op back to ecx */

L_add_bits_to_len:
	sub	bl, cl
	xor	eax, eax
	inc	eax
	shl	eax, cl
	dec	eax
	and	eax, edx          /* eax &= hold */
	shr	edx, cl
	add	[esp+64], eax      /* len += hold & mask[op] */

L_decode_distance:
	cmp	bl, 15
	ja	L_get_distance_code  /* if (15 < bits) */

	xor	eax, eax
	lodsw                         /* al = *(ushort *)in++ */
	mov	cl, bl            /* cl = bits, needs it for shifting */
	add	bl, 16             /* bits += 16 */
	shl	eax, cl
	or	edx, eax         /* hold |= *((ushort *)in)++ << bits */

L_get_distance_code:
	mov	eax, [esp+60]      /* eax = dmask */
	mov	ecx, [esp+36]      /* ecx = dcode */
	and	eax, edx          /* eax &= hold */
	mov	eax, [ecx+eax*4]/* eax = dcode[hold & dmask] */

L_dodist:
	mov	ebp, eax          /* dist = this */
	shr	ebp, 16            /* dist = this.val */
	mov	cl, ah
	sub	bl, ah            /* bits -= this.bits */
	shr	edx, cl           /* hold >>= this.bits */
	mov	cl, al            /* cl = this.op */

	test	al, 16             /* if ((op & 16) == 0) */
	jz	L_test_for_second_level_dist
	and	cl, 15             /* op &= 15 */
	jz	L_check_dist_one
	cmp	bl, cl
	jae	L_add_bits_to_dist   /* if (op <= bits) 97.6% */

	mov	ch, cl            /* stash op in ch, freeing cl */
	xor	eax, eax
	lodsw                         /* al = *(ushort *)in++ */
	mov	cl, bl            /* cl = bits, needs it for shifting */
	add	bl, 16             /* bits += 16 */
	shl	eax, cl
	or	edx, eax        /* hold |= *((ushort *)in)++ << bits */
	mov	cl, ch            /* move op back to ecx */

L_add_bits_to_dist:
	sub	bl, cl
	xor	eax, eax
	inc	eax
	shl	eax, cl
	dec	eax                 /* (1 << op) - 1 */
	and	eax, edx          /* eax &= hold */
	shr	edx, cl
	add	ebp, eax          /* dist += hold & ((1 << op) - 1) */

L_check_window:
	mov	[esp+8], esi       /* save in so from can use it's reg */
	mov	eax, edi
	sub	eax, [esp+20]      /* nbytes = out - beg */

	cmp	eax, ebp
	jb	L_clip_window        /* if (dist > nbytes) 4.2% */

	mov	ecx, [esp+64]      /* ecx = len */
	mov	esi, edi
	sub	esi, ebp          /* from = out - dist */

	sar	ecx, 1
	jnc	L_copy_two

	rep     movsw
	mov	al, [esi]
	mov	[edi], al
	inc	edi

	mov	esi, [esp+8]      /* move in back to %esi, toss from */
	mov	ebp, [esp+32]     /* ebp = lcode */
	jmp	L_while_test

L_copy_two:
	rep     movsw
	mov	esi, [esp+8]      /* move in back to %esi, toss from */
	mov	ebp, [esp+32]     /* ebp = lcode */
	jmp	L_while_test

ALIGN 4
L_check_dist_one:
	cmp	ebp, 1            /* if dist 1, is a memset */
	jne	L_check_window
	cmp	[esp+20], edi
	je	L_check_window    /* out == beg, if outside window */

	mov	ecx, [esp+64]     /* ecx = len */
	mov	al, [edi-1]
	mov	ah, al

	sar	ecx, 1
	jnc	L_set_two
	mov	[edi], al         /* memset out with from[-1] */
	inc	edi

L_set_two:
	rep     stosw
	mov	ebp, [esp+32]     /* ebp = lcode */
	jmp	L_while_test

ALIGN 4
L_test_for_second_level_length:
	test	al, 64
	jnz	L_test_for_end_of_block /* if ((op & 64) != 0) */

	xor	eax, eax
	inc	eax
	shl	eax, cl
	dec	eax
	and	eax, edx         /* eax &= hold */
	add	eax, [esp+64]     /* eax += len */
	mov	eax, [ebp+eax*4] /* eax = lcode[val+(hold&mask[op])]*/
	jmp	L_dolen

ALIGN 4
L_test_for_second_level_dist:
	test	al, 64
	jnz	L_invalid_distance_code /* if ((op & 64) != 0) */

	xor	eax, eax
	inc	eax
	shl	eax, cl
	dec	eax
	and	eax, edx         /* eax &= hold */
	add	eax, ebp         /* eax += dist */
	mov	ecx, [esp+36]     /* ecx = dcode */
	mov	eax, [ecx+eax*4] /* eax = dcode[val+(hold&mask[op])]*/
	jmp	L_dodist

ALIGN 4
L_clip_window:
	mov	ecx, eax
	mov	eax, [esp+48]     /* eax = wsize */
	neg	ecx                /* nbytes = -nbytes */
	mov	esi, [esp+28]     /* from = window */

	cmp	eax, ebp
	jb	L_invalid_distance_too_far /* if (dist > wsize) */

	add	ecx, ebp         /* nbytes = dist - nbytes */
	cmp	dword ptr [esp+52], 0
	jne	L_wrap_around_window /* if (write != 0) */

	sub	eax, ecx
	add	esi, eax         /* from += wsize - nbytes */

	mov	eax, [esp+64]    /* eax = len */
	cmp	eax, ecx
	jbe	L_do_copy          /* if (nbytes >= len) */

	sub	eax, ecx         /* len -= nbytes */
	rep     movsb
	mov	esi, edi
	sub	esi, ebp         /* from = out - dist */
	jmp	L_do_copy

ALIGN 4
L_wrap_around_window:
	mov	eax, [esp+52]    /* eax = write */
	cmp	ecx, eax
	jbe	L_contiguous_in_window /* if (write >= nbytes) */

	add	esi, [esp+48]    /* from += wsize */
	add	esi, eax         /* from += write */
	sub	esi, ecx         /* from -= nbytes */
	sub	ecx, eax         /* nbytes -= write */

	mov	eax, [esp+64]    /* eax = len */
	cmp	eax, ecx
	jbe	L_do_copy          /* if (nbytes >= len) */

	sub	eax, ecx         /* len -= nbytes */
	rep     movsb
	mov	esi, [esp+28]     /* from = window */
	mov	ecx, [esp+52]     /* nbytes = write */
	cmp	eax, ecx
	jbe	L_do_copy          /* if (nbytes >= len) */

	sub	eax, ecx         /* len -= nbytes */
	rep     movsb
	mov	esi, edi
	sub	esi, ebp         /* from = out - dist */
	jmp	L_do_copy

ALIGN 4
L_contiguous_in_window:
	add	esi, eax
	sub	esi, ecx         /* from += write - nbytes */

	mov	eax, [esp+64]    /* eax = len */
	cmp	eax, ecx
	jbe	L_do_copy          /* if (nbytes >= len) */

	sub	eax, ecx         /* len -= nbytes */
	rep     movsb
	mov	esi, edi
	sub	esi, ebp         /* from = out - dist */
	jmp	L_do_copy

ALIGN 4
L_do_copy:
	mov	ecx, eax
	rep     movsb

	mov	esi, [esp+8]      /* move in back to %esi, toss from */
	mov	ebp, [esp+32]     /* ebp = lcode */
	jmp	L_while_test

L_test_for_end_of_block:
	test	al, 32
	jz	L_invalid_literal_length_code
	mov	dword ptr [esp+72], 1
	jmp	L_break_loop_with_status

L_invalid_literal_length_code:
	mov	dword ptr [esp+72], 2
	jmp	L_break_loop_with_status

L_invalid_distance_code:
	mov	dword ptr [esp+72], 3
	jmp	L_break_loop_with_status

L_invalid_distance_too_far:
	mov	esi, [esp+4]
	mov	dword ptr [esp+72], 4
	jmp	L_break_loop_with_status

L_break_loop:
	mov	dword ptr [esp+72], 0

L_break_loop_with_status:
/* put in, out, bits, and hold back into ar and pop esp */
	mov	[esp+8], esi     /* save in */
	mov	[esp+16], edi    /* save out */
	mov	[esp+44], ebx    /* save bits */
	mov	[esp+40], edx    /* save hold */
	mov	ebp, [esp+4]     /* restore esp, ebp */
	mov	esp, [esp]
    }
#else
#error "x86 architecture not defined"
#endif

    if (ar.status > 1) {
        if (ar.status == 2)
            strm->msg = "invalid literal/length code";
        else if (ar.status == 3)
            strm->msg = "invalid distance code";
        else
            strm->msg = "invalid distance too far back";
        state->mode = BAD;
    }
    else if ( ar.status == 1 ) {
        state->mode = TYPE;
    }

    /* return unused bytes (on entry, bits < 8, so in won't go too far back) */
    ar.len = ar.bits >> 3;
    ar.in -= ar.len;
    ar.bits -= ar.len << 3;
    ar.hold &= (1U << ar.bits) - 1;

    /* update state and return */
    strm->next_in = ar.in;
    strm->next_out = ar.out;
    strm->avail_in = (unsigned)(ar.in < ar.last ?
                                PAD_AVAIL_IN + (ar.last - ar.in) :
                                PAD_AVAIL_IN - (ar.in - ar.last));
    strm->avail_out = (unsigned)(ar.out < ar.end ?
                                 PAD_AVAIL_OUT + (ar.end - ar.out) :
                                 PAD_AVAIL_OUT - (ar.out - ar.end));
    state->hold = ar.hold;
    state->bits = ar.bits;
    return;
}