#include <xvfs-core.h>
#include <sys/stat.h>
#include <unistd.h>
#include <string.h>
#include <tcl.h>
#define XVFS_NAME_LOOKUP_ERROR (-1)
#define XVFS_FILE_BLOCKSIZE 1024
/*
* XXX:TODO: Determine this automatically rather than
* by heuristics
*/
#define HAVE_STRUCT_STAT_ST_BLKSIZE 1
#define HAVE_STRUCT_STAT_ST_BLOCKS 1
#ifdef WIN32
# undef HAVE_STRUCT_STAT_ST_BLKSIZE
# undef HAVE_STRUCT_STAT_ST_BLOCKS
#endif
#define MIN(a, b) (((a) < (b)) ? (a) : (b))
typedef enum {
XVFS_FILE_TYPE_REG,
XVFS_FILE_TYPE_DIR
} xvfs_file_type_t;
typedef Tcl_WideInt xvfs_size_t;
struct xvfs_file_data {
const char *name;
xvfs_file_type_t type;
xvfs_size_t size;
union {
const unsigned char *fileContents;
const char **dirChildren;
} data;
};
<?
package require xvfs
set ::xvfs::hashNameThreshold 3
if {[info exists ::env(XVFS_CREATE_HASH_NAME_THRESHOLD)]} {
set ::xvfs::hashNameThreshold $::env(XVFS_CREATE_HASH_NAME_THRESHOLD)
}
if {$::xvfs::hashNameThreshold < 0} {
set ::xvfs::hashNameThreshold [expr {2**31}]
}
xvfs::main $argv
proc emitFilenameVerification {indentLevel outputFileNameLen outputFileIndexes} {
set indent [string repeat "\t" $indentLevel]
foreach outputFileIndex $outputFileIndexes {
?><?= $indent ?>if (memcmp(path, xvfs_<?= $::xvfs::fsName ?>_data[<?= $outputFileIndex ?>].name, <?= $outputFileNameLen ?>) == 0) {
<?= $indent ?> return(<?= $outputFileIndex ?>);
<?= $indent ?>}
<?
}
}
?>
static long xvfs_<?= $::xvfs::fsName ?>_nameToIndex(const char *path) {
<?
for {set index 0} {$index < [llength $::xvfs::outputFiles]} {incr index} {
set outputFileName [lindex $::xvfs::outputFiles $index]
set outputFileNameLen [string length $outputFileName]
set outputFileNameHash [zlib adler32 $outputFileName 0]
lappend outputFileNameHashToIndex([list $outputFileNameLen $outputFileNameHash]) $index
lappend outputFileNameLenToIndex($outputFileNameLen) $index
}
set needZlib false
foreach {outputFileNameLen outputFileIndexes} [lsort -stride 2 -dictionary [array get outputFileNameLenToIndex]] {
if {[llength $outputFileIndexes] > $::xvfs::hashNameThreshold} {
set needZlib true
break;
}
}
?><?
if {$needZlib} {
?> unsigned int pathHash;
<? } ?> size_t pathLen;
if (path == NULL) {
return(XVFS_NAME_LOOKUP_ERROR);
}
pathLen = strlen(path);
switch (pathLen) {
<?
foreach {outputFileNameLen outputFileIndexes} [lsort -stride 2 -dictionary [array get outputFileNameLenToIndex]] {
?> case <?= $outputFileNameLen ?>:
<?
if {[llength $outputFileIndexes] > $::xvfs::hashNameThreshold} {
?> pathHash = Tcl_ZlibAdler32(0, (const unsigned char *) path, <?= $outputFileNameLen ?>);
switch (pathHash) {
<?
foreach {key outputFileIndexes} [lsort -stride 2 -dictionary [array get outputFileNameHashToIndex [list $outputFileNameLen *]]] {
set outputFileNameHash [lindex $key 1]
?> case <?= $outputFileNameHash ?>:
<?
emitFilenameVerification 5 $outputFileNameLen $outputFileIndexes
?> break;
<?
}
?> }
<?
} else {
emitFilenameVerification 3 $outputFileNameLen $outputFileIndexes
}
?> break;
<? } ?> }
return(XVFS_NAME_LOOKUP_ERROR);
}
static const char **xvfs_<?= $::xvfs::fsName ?>_getChildren(const char *path, Tcl_WideInt *count) {
const struct xvfs_file_data *fileInfo;
long inode;
/*
* Validate input parameters
*/
if (count == NULL) {
return(NULL);
}
/*
* Get the inode from the lookup function
*/
inode = xvfs_<?= $::xvfs::fsName ?>_nameToIndex(path);
if (inode == XVFS_NAME_LOOKUP_ERROR) {
*count = XVFS_RV_ERR_ENOENT;
return(NULL);
}
fileInfo = &xvfs_<?= $::xvfs::fsName ?>_data[inode];
/*
* Ensure this is a directory
*/
if (fileInfo->type != XVFS_FILE_TYPE_DIR) {
*count = XVFS_RV_ERR_ENOTDIR;
return(NULL);
}
*count = fileInfo->size;
return(fileInfo->data.dirChildren);
}
static const unsigned char *xvfs_<?= $::xvfs::fsName ?>_getData(const char *path, Tcl_WideInt start, Tcl_WideInt *length) {
const struct xvfs_file_data *fileInfo;
Tcl_WideInt resultLength;
long inode;
/*
* Validate input parameters
*/
if (length == NULL) {
return(NULL);
}
if (start < 0) {
*length = XVFS_RV_ERR_EINVAL;
return(NULL);
}
if (*length < 0) {
*length = XVFS_RV_ERR_EINVAL;
return(NULL);
}
/*
* Get the inode from the lookup function
*/
inode = xvfs_<?= $::xvfs::fsName ?>_nameToIndex(path);
if (inode == XVFS_NAME_LOOKUP_ERROR) {
*length = XVFS_RV_ERR_ENOENT;
return(NULL);
}
fileInfo = &xvfs_<?= $::xvfs::fsName ?>_data[inode];
/*
* Ensure this is a file that can be read
*/
if (fileInfo->type != XVFS_FILE_TYPE_REG) {
*length = XVFS_RV_ERR_EISDIR;
return(NULL);
}
/*
* Validate the length
*/
if (start > fileInfo->size) {
*length = XVFS_RV_ERR_EFAULT;
return(NULL);
}
if (*length == 0) {
resultLength = fileInfo->size - start;
} else {
resultLength = MIN(fileInfo->size - start, *length);
}
*length = resultLength;
/*
* Return the data
*/
return(fileInfo->data.fileContents + start);
}
static int xvfs_<?= $::xvfs::fsName ?>_getStat(const char *path, Tcl_StatBuf *statBuf) {
const struct xvfs_file_data *fileInfo;
long inode;
/*
* Validate input parameters
*/
if (!statBuf) {
return(XVFS_RV_ERR_EINVAL);
}
/*
* Get the inode from the lookup function
*/
inode = xvfs_<?= $::xvfs::fsName ?>_nameToIndex(path);
if (inode == XVFS_NAME_LOOKUP_ERROR) {
return(XVFS_RV_ERR_ENOENT);
}
fileInfo = &xvfs_<?= $::xvfs::fsName ?>_data[inode];
statBuf->st_dev = <?= [zlib adler32 $::xvfs::fsName] ?>;
statBuf->st_rdev = <?= [zlib adler32 $::xvfs::fsName] ?>;
statBuf->st_ino = inode;
statBuf->st_uid = 0;
statBuf->st_gid = 0;
statBuf->st_atime = 0;
statBuf->st_ctime = 0;
statBuf->st_mtime = 0;
#ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
statBuf->st_blksize = XVFS_FILE_BLOCKSIZE;
#endif
if (fileInfo->type == XVFS_FILE_TYPE_REG) {
statBuf->st_mode = 0100444;
statBuf->st_nlink = 1;
statBuf->st_size = fileInfo->size;
#ifdef HAVE_STRUCT_STAT_ST_BLOCKS
statBuf->st_blocks = (fileInfo->size + statBuf->st_blksize - 1) / statBuf->st_blksize;
#endif
} else if (fileInfo->type == XVFS_FILE_TYPE_DIR) {
statBuf->st_mode = 040555;
statBuf->st_nlink = fileInfo->size;
statBuf->st_size = fileInfo->size;
#ifdef HAVE_STRUCT_STAT_ST_BLOCKS
statBuf->st_blocks = 1;
#endif
}
return(0);
}
static struct Xvfs_FSInfo xvfs_<?= $::xvfs::fsName ?>_fsInfo = {
.protocolVersion = XVFS_PROTOCOL_VERSION,
.name = "<?= $::xvfs::fsName ?>",
.getChildrenProc = xvfs_<?= $::xvfs::fsName ?>_getChildren,
.getDataProc = xvfs_<?= $::xvfs::fsName ?>_getData,
.getStatProc = xvfs_<?= $::xvfs::fsName ?>_getStat
};
int Xvfs_<?= $::xvfs::fsName ?>_Init(Tcl_Interp *interp) {
int register_ret;
#ifdef USE_TCL_STUBS
const char *tclInitStubs_ret;
/* Initialize Stubs */
tclInitStubs_ret = Tcl_InitStubs(interp, TCL_PATCH_LEVEL, 0);
if (!tclInitStubs_ret) {
return(TCL_ERROR);
}
#endif
register_ret = Xvfs_Register(interp, &xvfs_<?= $::xvfs::fsName ?>_fsInfo);
if (register_ret != TCL_OK) {
return(register_ret);
}
return(TCL_OK);
}
#undef XVFS_NAME_LOOKUP_ERROR
#undef XVFS_FILE_BLOCKSIZE