/
zip.c
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/*
* ZIP support routines for PhysicsFS.
*
* Please see the file LICENSE in the source's root directory.
*
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* This file written by Ryan C. Gordon, with some peeking at "unzip.c"
* by Gilles Vollant.
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*/
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#if HAVE_CONFIG_H
# include <config.h>
#endif
#if (defined PHYSFS_SUPPORTS_ZIP)
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#include <stdio.h>
#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include <time.h>
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#include <errno.h>
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#include "physfs.h"
#include "zlib.h"
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#define __PHYSICSFS_INTERNAL__
#include "physfs_internal.h"
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/*
* A buffer of ZIP_READBUFSIZE is malloc() for each compressed file opened,
* and is free()'d when you close the file; compressed data is read into
* this buffer, and then is decompressed into the buffer passed to
* PHYSFS_read().
*
* Uncompressed entries in a zipfile do not allocate this buffer; they just
* read data directly into the buffer passed to PHYSFS_read().
*
* Depending on your speed and memory requirements, you should tweak this
* value.
*/
#define ZIP_READBUFSIZE (16 * 1024)
/*
* One ZIPentry is kept for each file in an open ZIP archive.
*/
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typedef struct
{
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char *name; /* Name of file in archive */
char *symlink; /* NULL or file we link to */
int fixed_up; /* Have we updated offset? */
PHYSFS_uint32 offset; /* offset of data in file */
PHYSFS_uint16 version; /* version made by */
PHYSFS_uint16 version_needed; /* version needed to extract */
PHYSFS_uint16 flag; /* general purpose bit flag */
PHYSFS_uint16 compression_method; /* compression method */
PHYSFS_uint32 crc; /* crc-32 */
PHYSFS_uint32 compressed_size; /* compressed size */
PHYSFS_uint32 uncompressed_size; /* uncompressed size */
PHYSFS_sint64 last_mod_time; /* last file mod time */
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} ZIPentry;
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/*
* One ZIPinfo is kept for each open ZIP archive.
*/
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typedef struct
{
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char *archiveName; /* path to ZIP in platform-dependent notation. */
PHYSFS_uint16 entryCount; /* Number of files in ZIP. */
ZIPentry *entries; /* info on all files in ZIP. */
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} ZIPinfo;
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/*
* One ZIPfileinfo is kept for each open file in a ZIP archive.
*/
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typedef struct
{
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ZIPentry *entry; /* Info on file. */
void *handle; /* physical file handle. */
PHYSFS_uint32 compressed_position; /* offset in compressed data. */
PHYSFS_uint32 uncompressed_position; /* tell() position. */
PHYSFS_uint8 *buffer; /* decompression buffer. */
z_stream stream; /* zlib stream state. */
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} ZIPfileinfo;
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/* Magic numbers... */
#define ZIP_LOCAL_FILE_SIG 0x04034b50
#define ZIP_CENTRAL_DIR_SIG 0x02014b50
#define ZIP_END_OF_CENTRAL_DIR_SIG 0x06054b50
/* compression methods... */
#define COMPMETH_NONE 0
/* ...and others... */
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#define UNIX_FILETYPE_MASK 0170000
#define UNIX_FILETYPE_SYMLINK 0120000
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#define MAXZIPENTRYSIZE 256 /* !!! FIXME: get rid of this. */
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/* Number of symlinks to follow before we assume it's a recursive link... */
#define SYMLINK_RECURSE_COUNT 20
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static PHYSFS_sint64 ZIP_read(FileHandle *handle, void *buffer,
PHYSFS_uint32 objSize, PHYSFS_uint32 objCount);
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static int ZIP_eof(FileHandle *handle);
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static PHYSFS_sint64 ZIP_tell(FileHandle *handle);
static int ZIP_seek(FileHandle *handle, PHYSFS_uint64 offset);
static PHYSFS_sint64 ZIP_fileLength(FileHandle *handle);
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static int ZIP_fileClose(FileHandle *handle);
static int ZIP_isArchive(const char *filename, int forWriting);
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static char *get_zip_realpath(void *in, ZIPentry *entry);
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static DirHandle *ZIP_openArchive(const char *name, int forWriting);
static LinkedStringList *ZIP_enumerateFiles(DirHandle *h,
const char *dirname,
int omitSymLinks);
static int ZIP_exists(DirHandle *h, const char *name);
static int ZIP_isDirectory(DirHandle *h, const char *name);
static int ZIP_isSymLink(DirHandle *h, const char *name);
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static PHYSFS_sint64 ZIP_getLastModTime(DirHandle *h, const char *name);
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static FileHandle *ZIP_openRead(DirHandle *h, const char *filename);
static void ZIP_dirClose(DirHandle *h);
static const FileFunctions __PHYSFS_FileFunctions_ZIP =
{
ZIP_read, /* read() method */
NULL, /* write() method */
ZIP_eof, /* eof() method */
ZIP_tell, /* tell() method */
ZIP_seek, /* seek() method */
ZIP_fileLength, /* fileLength() method */
ZIP_fileClose /* fileClose() method */
};
const DirFunctions __PHYSFS_DirFunctions_ZIP =
{
ZIP_isArchive, /* isArchive() method */
ZIP_openArchive, /* openArchive() method */
ZIP_enumerateFiles, /* enumerateFiles() method */
ZIP_exists, /* exists() method */
ZIP_isDirectory, /* isDirectory() method */
ZIP_isSymLink, /* isSymLink() method */
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ZIP_getLastModTime, /* getLastModTime() method */
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ZIP_openRead, /* openRead() method */
NULL, /* openWrite() method */
NULL, /* openAppend() method */
NULL, /* remove() method */
NULL, /* mkdir() method */
ZIP_dirClose /* dirClose() method */
};
const PHYSFS_ArchiveInfo __PHYSFS_ArchiveInfo_ZIP =
{
"ZIP",
"PkZip/WinZip/Info-Zip compatible",
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"Ryan C. Gordon <icculus@clutteredmind.org>",
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"http://www.icculus.org/physfs/",
};
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/*
* Wrap all zlib calls in this, so the physfs error state is set appropriately.
*/
static int zlib_err(int rc)
{
const char *err = NULL;
switch (rc)
{
case Z_OK:
case Z_STREAM_END:
break; /* not errors. */
case Z_ERRNO:
err = strerror(errno);
break;
case Z_NEED_DICT:
err = "zlib: need dictionary";
break;
case Z_DATA_ERROR:
err = "zlib: need dictionary";
break;
case Z_MEM_ERROR:
err = "zlib: memory error";
break;
case Z_BUF_ERROR:
err = "zlib: buffer error";
break;
case Z_VERSION_ERROR:
err = "zlib: version error";
break;
default:
err = "unknown zlib error";
break;
} /* switch */
if (err != NULL)
__PHYSFS_setError(err);
return(rc);
} /* zlib_err */
/*
* Read an unsigned 32-bit int and swap to native byte order.
*/
static int readui32(void *in, PHYSFS_uint32 *val)
{
PHYSFS_uint32 v;
BAIL_IF_MACRO(__PHYSFS_platformRead(in, &v, sizeof (v), 1) != 1, NULL, 0);
*val = PHYSFS_swapULE32(v);
return(1);
} /* readui32 */
/*
* Read an unsigned 16-bit int and swap to native byte order.
*/
static int readui16(void *in, PHYSFS_uint16 *val)
{
PHYSFS_uint16 v;
BAIL_IF_MACRO(__PHYSFS_platformRead(in, &v, sizeof (v), 1) != 1, NULL, 0);
*val = PHYSFS_swapULE16(v);
return(1);
} /* readui16 */
static PHYSFS_sint64 ZIP_read(FileHandle *handle, void *buf,
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PHYSFS_uint32 objSize, PHYSFS_uint32 objCount)
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{
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ZIPfileinfo *finfo = (ZIPfileinfo *) (handle->opaque);
ZIPentry *entry = finfo->entry;
PHYSFS_sint64 retval = 0;
PHYSFS_sint64 maxread = ((PHYSFS_sint64) objSize) * objCount;
PHYSFS_sint64 avail = entry->uncompressed_size -
finfo->uncompressed_position;
BAIL_IF_MACRO(maxread == 0, NULL, 0); /* quick rejection. */
if (avail < maxread)
{
maxread = avail - (avail % objSize);
objCount = maxread / objSize;
BAIL_IF_MACRO(objCount == 0, ERR_PAST_EOF, 0); /* quick rejection. */
__PHYSFS_setError(ERR_PAST_EOF); /* this is always true here. */
} /* if */
if (entry->compression_method == COMPMETH_NONE)
{
retval = __PHYSFS_platformRead(finfo->handle, buf, objSize, objCount);
} /* if */
else
{
finfo->stream.next_out = buf;
finfo->stream.avail_out = objSize * objCount;
while (retval < maxread)
{
PHYSFS_uint32 before = finfo->stream.total_out;
int rc;
if (finfo->stream.avail_in == 0)
{
PHYSFS_sint64 br;
br = entry->compressed_size - finfo->compressed_position;
if (br > 0)
{
if (br > ZIP_READBUFSIZE)
br = ZIP_READBUFSIZE;
br = __PHYSFS_platformRead(finfo->handle,
finfo->buffer,
1, br);
if (br <= 0)
break;
finfo->compressed_position += br;
finfo->stream.next_in = finfo->buffer;
finfo->stream.avail_in = br;
} /* if */
} /* if */
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rc = zlib_err(inflate(&finfo->stream, Z_SYNC_FLUSH));
retval += (finfo->stream.total_out - before);
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if (rc != Z_OK)
break;
} /* while */
retval /= objSize;
} /* else */
if (retval > 0)
finfo->uncompressed_position += (retval * objSize);
return(retval);
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} /* ZIP_read */
static int ZIP_eof(FileHandle *handle)
{
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ZIPfileinfo *finfo = ((ZIPfileinfo *) (handle->opaque));
return(finfo->uncompressed_position >= finfo->entry->uncompressed_size);
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} /* ZIP_eof */
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static PHYSFS_sint64 ZIP_tell(FileHandle *handle)
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{
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return(((ZIPfileinfo *) (handle->opaque))->uncompressed_position);
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} /* ZIP_tell */
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static int ZIP_seek(FileHandle *handle, PHYSFS_uint64 offset)
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{
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ZIPfileinfo *finfo = (ZIPfileinfo *) (handle->opaque);
ZIPentry *entry = finfo->entry;
void *in = finfo->handle;
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BAIL_IF_MACRO(offset > entry->uncompressed_size, ERR_PAST_EOF, 0);
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if (entry->compression_method == COMPMETH_NONE)
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{
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PHYSFS_sint64 newpos = offset + entry->offset;
BAIL_IF_MACRO(!__PHYSFS_platformSeek(in, newpos), NULL, 0);
finfo->uncompressed_position = newpos;
} /* if */
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else
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{
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/*
* If seeking backwards, we need to redecode the file
* from the start and throw away the compressed bits until we hit
* the offset we need. If seeking forward, we still need to
* redecode, but we don't rewind first.
*/
if (offset < finfo->uncompressed_position)
{
/* we do a copy so state is sane if inflateInit2() fails. */
z_stream str;
memset(&str, '\0', sizeof (z_stream));
if (zlib_err(inflateInit2(&str, -MAX_WBITS)) != Z_OK)
return(0);
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if (!__PHYSFS_platformSeek(in, entry->offset))
return(0);
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inflateEnd(&finfo->stream);
memcpy(&finfo->stream, &str, sizeof (z_stream));
finfo->uncompressed_position = finfo->compressed_position = 0;
} /* if */
while (finfo->uncompressed_position != offset)
{
PHYSFS_uint8 buf[512];
PHYSFS_uint32 maxread = offset - finfo->uncompressed_position;
if (maxread > sizeof (buf))
maxread = sizeof (buf);
if (ZIP_read(handle, buf, maxread, 1) != 1)
return(0);
} /* while */
} /* else */
return(1);
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} /* ZIP_seek */
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static PHYSFS_sint64 ZIP_fileLength(FileHandle *handle)
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{
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ZIPfileinfo *finfo = (ZIPfileinfo *) (handle->opaque);
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return(finfo->entry->uncompressed_size);
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} /* ZIP_fileLength */
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static int ZIP_fileClose(FileHandle *handle)
{
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ZIPfileinfo *finfo = (ZIPfileinfo *) (handle->opaque);
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__PHYSFS_platformClose(finfo->handle);
if (finfo->entry->compression_method != COMPMETH_NONE)
inflateEnd(&finfo->stream);
if (finfo->buffer != NULL)
free(finfo->buffer);
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free(finfo);
return(1);
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} /* ZIP_fileClose */
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static PHYSFS_sint64 find_end_of_central_dir(void *in, PHYSFS_sint64 *len)
{
/* !!! FIXME: potential race condition! */
/* !!! FIXME: mutex this or switch to smaller stack-based buffer. */
static PHYSFS_uint8 buf[0xFFFF + 20];
PHYSFS_sint32 i;
PHYSFS_sint64 filelen;
PHYSFS_sint64 filepos;
PHYSFS_sint32 maxread;
filelen = __PHYSFS_platformFileLength(in);
BAIL_IF_MACRO(filelen == -1, NULL, 0);
/*
* Jump to the end of the file and start reading backwards.
* The last thing in the file is the zipfile comment, which is variable
* length, and the field that specifies its size is before it in the
* file (argh!)...this means that we need to scan backwards until we
* hit the end-of-central-dir signature. We can then sanity check that
* the comment was as big as it should be to make sure we're in the
* right place. The comment length field is 16 bits, so we can stop
* searching for that signature after 64k at most, and call it a
* corrupted zipfile.
*/
/*
* !!! FIXME: This was easier than reading backwards in chunks, but it's
* !!! FIXME: rather memory hungry.
*/
if (sizeof (buf) < filelen)
{
filepos = filelen - sizeof (buf);
maxread = sizeof (buf);
} /* if */
else
{
filepos = 0;
maxread = filelen;
} /* else */
BAIL_IF_MACRO(!__PHYSFS_platformSeek(in, filepos), NULL, -1);
BAIL_IF_MACRO(__PHYSFS_platformRead(in, buf, maxread, 1) != 1, NULL, -1);
for (i = maxread - 4; i > 0; i--)
{
if ((buf[i + 0] == 0x50) &&
(buf[i + 1] == 0x4B) &&
(buf[i + 2] == 0x05) &&
(buf[i + 3] == 0x06) )
{
break; /* that's the signature! */
} /* if */
} /* for */
BAIL_IF_MACRO(i < 0, ERR_NOT_AN_ARCHIVE, -1);
if (len != NULL)
*len = filelen;
return(filelen - (maxread - i));
} /* find_end_of_central_dir */
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static int ZIP_isArchive(const char *filename, int forWriting)
{
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PHYSFS_uint32 sig;
int retval;
void *in;
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in = __PHYSFS_platformOpenRead(filename);
BAIL_IF_MACRO(in == NULL, NULL, 0);
/*
* The first thing in a zip file might be the signature of the
* first local file record, so it makes for a quick determination.
*/
BAIL_IF_MACRO(!readui32(in, &sig), NULL, 0);
retval = (sig == ZIP_LOCAL_FILE_SIG);
if (!retval)
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{
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/*
* No sig...might be a ZIP with data at the start
* (a self-extracting executable, etc), so we'll have to do
* it the hard way...
*/
retval = (find_end_of_central_dir(in, NULL) == -1);
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} /* if */
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__PHYSFS_platformClose(in);
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return(retval);
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} /* ZIP_isArchive */
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static int zip_set_open_position(void *in, ZIPentry *entry)
{
/*
* We fix up the offset to point to the actual data on the
* first open, since we don't want to seek across the whole file on
* archive open (can be SLOW on large, CD-stored files), but we
* need to check the local file header...not just for corruption,
* but since it stores offset info the central directory does not.
*/
if (!entry->fixed_up)
{
PHYSFS_uint32 ui32;
PHYSFS_uint16 ui16;
PHYSFS_uint16 fnamelen;
PHYSFS_uint16 extralen;
BAIL_IF_MACRO(!__PHYSFS_platformSeek(in, entry->offset), NULL, 0);
BAIL_IF_MACRO(!readui32(in, &ui32), NULL, 0);
BAIL_IF_MACRO(ui32 != ZIP_LOCAL_FILE_SIG, ERR_CORRUPTED, 0);
BAIL_IF_MACRO(!readui16(in, &ui16), NULL, 0);
BAIL_IF_MACRO(ui16 != entry->version_needed, ERR_CORRUPTED, 0);
BAIL_IF_MACRO(!readui16(in, &ui16), NULL, 0); /* general bits. */
BAIL_IF_MACRO(!readui16(in, &ui16), NULL, 0);
BAIL_IF_MACRO(ui16 != entry->compression_method, ERR_CORRUPTED, 0);
BAIL_IF_MACRO(!readui32(in, &ui32), NULL, 0); /* date/time */
BAIL_IF_MACRO(!readui32(in, &ui32), NULL, 0);
BAIL_IF_MACRO(ui32 != entry->crc, ERR_CORRUPTED, 0);
BAIL_IF_MACRO(!readui32(in, &ui32), NULL, 0);
BAIL_IF_MACRO(ui32 != entry->compressed_size, ERR_CORRUPTED, 0);
BAIL_IF_MACRO(!readui32(in, &ui32), NULL, 0);
BAIL_IF_MACRO(ui32 != entry->uncompressed_size, ERR_CORRUPTED, 0);
BAIL_IF_MACRO(!readui16(in, &fnamelen), NULL, 0);
BAIL_IF_MACRO(!readui16(in, &extralen), NULL, 0);
entry->offset += fnamelen + extralen + 30;
entry->fixed_up = 1;
} /* if */
return(__PHYSFS_platformSeek(in, entry->offset));
} /* zip_set_open_position */
static void freeEntries(ZIPinfo *info, int count)
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{
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int i;
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for (i = 0; i < count; i++)
{
free(info->entries[i].name);
if (info->entries[i].symlink != NULL)
free(info->entries[i].symlink);
} /* for */
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free(info->entries);
} /* freeEntries */
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/*
* !!! FIXME: Really implement this.
* !!! FIXME: symlinks in zipfiles can be relative paths, including
* !!! FIXME: "." and ".." entries. These need to be parsed out.
* !!! FIXME: For now, though, we're just copying the relative path. Oh well.
*/
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static char *expand_symlink_path(char *path, ZIPentry *entry)
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{
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/*
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char *retval = (char *) malloc(strlen(path) + 1);
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BAIL_IF_MACRO(retval == NULL, ERR_OUT_OF_MEMORY, NULL);
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strcpy(retval, path);
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return(retval);
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*/
return(path); /* !!! FIXME */
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} /* expand_symlink_path */
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static char *get_zip_realpath(void *in, ZIPentry *entry)
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{
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char *path;
PHYSFS_uint32 size = entry->uncompressed_size;
int rc = 0;
BAIL_IF_MACRO(!zip_set_open_position(in, entry), NULL, NULL);
path = (char *) malloc(size + 1);
BAIL_IF_MACRO(path == NULL, ERR_OUT_OF_MEMORY, NULL);
if (entry->compression_method == COMPMETH_NONE)
rc = (__PHYSFS_platformRead(in, path, size, 1) == 1);
else /* symlink target path is compressed... */
{
z_stream stream;
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PHYSFS_uint32 compsize = entry->compressed_size;
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PHYSFS_uint8 *compressed = (PHYSFS_uint8 *) malloc(compsize);
if (compressed != NULL)
{
if (__PHYSFS_platformRead(in, compressed, compsize, 1) == 1)
{
memset(&stream, '\0', sizeof (z_stream));
stream.next_in = compressed;
stream.avail_in = compsize;
stream.next_out = path;
stream.avail_out = size;
if (zlib_err(inflateInit2(&stream, -MAX_WBITS)) == Z_OK)
{
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rc = zlib_err(inflate(&stream, Z_FINISH));
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inflateEnd(&stream);
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/* both are acceptable outcomes... */
rc = ((rc == Z_OK) || (rc == Z_STREAM_END));
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} /* if */
} /* if */
free(compressed);
} /* if */
} /* else */
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if (!rc)
{
free(path);
return(NULL);
} /* if */
path[entry->uncompressed_size] = '\0'; /* null-terminate it. */
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return(expand_symlink_path(path, entry)); /* retval is realloc()'d path. */
} /* get_zip_realpath */
620
621
622
static int version_does_symlinks(PHYSFS_uint32 version)
623
624
{
int retval = 0;
625
PHYSFS_uint8 hosttype = (PHYSFS_uint8) ((version >> 8) & 0xFF);
626
627
628
switch (hosttype)
{
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
/*
* These are the platforms that can NOT build an archive with
* symlinks, according to the Info-ZIP project.
*/
case 0: /* FS_FAT_ */
case 1: /* AMIGA_ */
case 2: /* VMS_ */
case 4: /* VM_CSM_ */
case 6: /* FS_HPFS_ */
case 11: /* FS_NTFS_ */
case 14: /* FS_VFAT_ */
case 13: /* ACORN_ */
case 15: /* MVS_ */
case 18: /* THEOS_ */
break; /* do nothing. */
default: /* assume the rest to be unix-like. */
646
647
648
649
650
651
652
653
retval = 1;
break;
} /* switch */
return(retval);
} /* version_does_symlinks */
654
static int entry_is_symlink(ZIPentry *entry, PHYSFS_uint32 extern_attr)
655
{
656
657
PHYSFS_uint16 xattr = ((extern_attr >> 16) & 0xFFFF);
658
return (
659
660
(version_does_symlinks(entry->version)) &&
(entry->uncompressed_size > 0) &&
661
((xattr & UNIX_FILETYPE_MASK) == UNIX_FILETYPE_SYMLINK)
662
663
664
665
);
} /* entry_is_symlink */
666
PHYSFS_sint64 dos_time_to_physfs_time(PHYSFS_uint32 dostime)
667
{
668
669
670
PHYSFS_uint32 dosdate = (PHYSFS_uint32) (dostime >> 16);
struct tm unixtime;
memset(&unixtime, '\0', sizeof (unixtime));
671
672
673
674
unixtime.tm_mday = (PHYSFS_uint32) (dosdate & 0x1F);
unixtime.tm_mon = (PHYSFS_uint32) ((((dosdate) & 0x1E0) / 0x20) - 1);
unixtime.tm_year = (PHYSFS_uint32) (((dosdate & 0x0FE00) / 0x0200) + 80);
675
676
677
678
unixtime.tm_hour = (PHYSFS_uint32) ((dostime & 0xF800) / 0x800);
unixtime.tm_min = (PHYSFS_uint32) ((dostime & 0x7E0) / 0x20);
unixtime.tm_sec = (PHYSFS_uint32) (2 * (dostime & 0x1F));
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
return((PHYSFS_sint64) mktime(&unixtime));
} /* dos_time_to_physfs_time */
static int load_zip_entry(void *in, ZIPentry *entry, PHYSFS_uint32 ofs_fixup)
{
PHYSFS_uint16 fnamelen, extralen, commentlen;
PHYSFS_uint32 external_attr;
PHYSFS_uint16 ui16;
PHYSFS_uint32 ui32;
PHYSFS_sint64 si64;
/* sanity check with central directory signature... */
BAIL_IF_MACRO(!readui32(in, &ui32), NULL, 0);
BAIL_IF_MACRO(ui32 != ZIP_CENTRAL_DIR_SIG, ERR_CORRUPTED, 0);
/* Get the pertinent parts of the record... */
BAIL_IF_MACRO(!readui16(in, &entry->version), NULL, 0);
BAIL_IF_MACRO(!readui16(in, &entry->version_needed), NULL, 0);
BAIL_IF_MACRO(!readui16(in, &entry->flag), NULL, 0);
BAIL_IF_MACRO(!readui16(in, &entry->compression_method), NULL, 0);
BAIL_IF_MACRO(!readui32(in, &ui32), NULL, 0);
entry->last_mod_time = dos_time_to_physfs_time(ui32);
BAIL_IF_MACRO(!readui32(in, &entry->crc), NULL, 0);
BAIL_IF_MACRO(!readui32(in, &entry->compressed_size), NULL, 0);
BAIL_IF_MACRO(!readui32(in, &entry->uncompressed_size), NULL, 0);
BAIL_IF_MACRO(!readui16(in, &fnamelen), NULL, 0);
BAIL_IF_MACRO(!readui16(in, &extralen), NULL, 0);
BAIL_IF_MACRO(!readui16(in, &commentlen), NULL, 0);
BAIL_IF_MACRO(!readui16(in, &ui16), NULL, 0); /* disk number start */
BAIL_IF_MACRO(!readui16(in, &ui16), NULL, 0); /* internal file attribs */
BAIL_IF_MACRO(!readui32(in, &external_attr), NULL, 0);
BAIL_IF_MACRO(!readui32(in, &entry->offset), NULL, 0);
entry->offset += ofs_fixup;
entry->fixed_up = 0; /* we need to do a second fixup at openRead(). */
entry->name = (char *) malloc(fnamelen + 1);
BAIL_IF_MACRO(entry->name == NULL, ERR_OUT_OF_MEMORY, 0);
if (__PHYSFS_platformRead(in, entry->name, fnamelen, 1) != 1)
goto load_zip_entry_puked;
entry->name[fnamelen] = '\0'; /* null-terminate the filename. */
si64 = __PHYSFS_platformTell(in);
if (si64 == -1)
goto load_zip_entry_puked;
/* If this is a symlink, resolve it. */
if (!entry_is_symlink(entry, external_attr))
entry->symlink = NULL;
else
731
{
732
733
734
735
entry->symlink = get_zip_realpath(in, entry);
if (entry->symlink == NULL)
goto load_zip_entry_puked;
} /* else */
736
737
738
739
/* seek to the start of the next entry in the central directory... */
if (!__PHYSFS_platformSeek(in, si64 + extralen + commentlen))
goto load_zip_entry_puked;
740
741
return(1); /* success. */
742
743
744
745
746
load_zip_entry_puked:
free(entry->name);
return(0); /* failure. */
} /* load_zip_entry */
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
static int load_zip_entries(void *in, DirHandle *dirh,
PHYSFS_uint32 data_ofs, PHYSFS_uint32 central_ofs)
{
ZIPinfo *info = (ZIPinfo *) dirh->opaque;
PHYSFS_uint32 max = info->entryCount;
PHYSFS_uint32 i;
BAIL_IF_MACRO(!__PHYSFS_platformSeek(in, central_ofs), NULL, 0);
info->entries = (ZIPentry *) malloc(sizeof (ZIPentry) * max);
BAIL_IF_MACRO(info->entries == NULL, ERR_OUT_OF_MEMORY, 0);
for (i = 0; i < max; i++)
{
if (!load_zip_entry(in, &info->entries[i], data_ofs))
764
{
765
freeEntries(info, i);
766
767
768
769
770
return(0);
} /* if */
} /* for */
return(1);
771
} /* load_zip_entries */
772
773
774
775
776
static int parse_end_of_central_dir(void *in, DirHandle *dirh,
PHYSFS_uint32 *data_start,
PHYSFS_uint32 *central_dir_ofs)
777
{
778
779
780
781
782
ZIPinfo *zipinfo = (ZIPinfo *) dirh->opaque;
PHYSFS_uint32 ui32;
PHYSFS_uint16 ui16;
PHYSFS_sint64 len;
PHYSFS_sint64 pos;
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
/* find the end-of-central-dir record, and seek to it. */
pos = find_end_of_central_dir(in, &len);
BAIL_IF_MACRO(pos == -1, NULL, 0);
BAIL_IF_MACRO(!__PHYSFS_platformSeek(in, pos), NULL, 0);
/* check signature again, just in case. */
BAIL_IF_MACRO(!readui32(in, &ui32), NULL, 0);
BAIL_IF_MACRO(ui32 != ZIP_END_OF_CENTRAL_DIR_SIG, ERR_NOT_AN_ARCHIVE, 0);
/* number of this disk */
BAIL_IF_MACRO(!readui16(in, &ui16), NULL, 0);
BAIL_IF_MACRO(ui16 != 0, ERR_UNSUPPORTED_ARCHIVE, 0);
/* number of the disk with the start of the central directory */
BAIL_IF_MACRO(!readui16(in, &ui16), NULL, 0);
BAIL_IF_MACRO(ui16 != 0, ERR_UNSUPPORTED_ARCHIVE, 0);
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
/* total number of entries in the central dir on this disk */
BAIL_IF_MACRO(!readui16(in, &ui16), NULL, 0);
/* total number of entries in the central dir */
BAIL_IF_MACRO(!readui16(in, &zipinfo->entryCount), NULL, 0);
BAIL_IF_MACRO(ui16 != zipinfo->entryCount, ERR_UNSUPPORTED_ARCHIVE, 0);
/* size of the central directory */
BAIL_IF_MACRO(!readui32(in, &ui32), NULL, 0);
/* offset of central directory */
BAIL_IF_MACRO(!readui32(in, central_dir_ofs), NULL, 0);
BAIL_IF_MACRO(pos < *central_dir_ofs + ui32, ERR_UNSUPPORTED_ARCHIVE, 0);
/*
* For self-extracting archives, etc, there's crapola in the file
* before the zipfile records; we calculate how much data there is
* prepended by determining how far the central directory offset is
* from where it is supposed to be (start of end-of-central-dir minus
* sizeof central dir)...the difference in bytes is how much arbitrary
* data is at the start of the physical file.
*/
*data_start = pos - (*central_dir_ofs + ui32);
/* Now that we know the difference, fix up the central dir offset... */
*central_dir_ofs += *data_start;
/* zipfile comment length */
BAIL_IF_MACRO(!readui16(in, &ui16), NULL, 0);
/*
* Make sure that the comment length matches to the end of file...
* If it doesn't, we're either in the wrong part of the file, or the
* file is corrupted, but we give up either way.
*/
BAIL_IF_MACRO((pos + 22 + ui16) != len, ERR_UNSUPPORTED_ARCHIVE, 0);
return(1); /* made it. */
} /* parse_end_of_central_dir */
static DirHandle *allocate_zip_dirhandle(const char *name)
{
char *ptr;
DirHandle *retval = malloc(sizeof (DirHandle));
846
847
BAIL_IF_MACRO(retval == NULL, ERR_OUT_OF_MEMORY, NULL);
848
memset(retval, '\0', sizeof (DirHandle));
849
850
851
852
853
retval->opaque = malloc(sizeof (ZIPinfo));
if (retval->opaque == NULL)
{
free(retval);
854
BAIL_MACRO(ERR_OUT_OF_MEMORY, NULL);
855
856
} /* if */
857
858
859
860
memset(retval->opaque, '\0', sizeof (ZIPinfo));
ptr = (char *) malloc(strlen(name) + 1);
if (ptr == NULL)
861
862
863
{
free(retval->opaque);
free(retval);
864
BAIL_MACRO(ERR_OUT_OF_MEMORY, NULL);
865
866
} /* if */
867
((ZIPinfo *) (retval->opaque))->archiveName = ptr;
868
strcpy(((ZIPinfo *) (retval->opaque))->archiveName, name);
869
870
871
retval->funcs = &__PHYSFS_DirFunctions_ZIP;
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
return(retval);
} /* allocate_zip_dirhandle */
static DirHandle *ZIP_openArchive(const char *name, int forWriting)
{
DirHandle *retval = NULL;
void *in = NULL;
PHYSFS_uint32 data_start;
PHYSFS_uint32 central_dir_ofs;
int success = 0;
BAIL_IF_MACRO(forWriting, ERR_ARC_IS_READ_ONLY, NULL);
if ((in = __PHYSFS_platformOpenRead(name)) == NULL)
goto zip_openarchive_end;
if ((retval = allocate_zip_dirhandle(name)) == NULL)
goto zip_openarchive_end;
if (!parse_end_of_central_dir(in, retval, &data_start, ¢ral_dir_ofs))
goto zip_openarchive_end;
if (!load_zip_entries(in, retval, data_start, central_dir_ofs))
goto zip_openarchive_end;
success = 1; /* ...and we're good to go. :) */
zip_openarchive_end:
if (!success) /* clean up for failures. */
{
if (retval != NULL)
{
if (retval->opaque != NULL)
{
if (((ZIPinfo *) (retval->opaque))->archiveName != NULL)
free(((ZIPinfo *) (retval->opaque))->archiveName);
free(retval->opaque);
} /* if */
free(retval);
retval = NULL;
} /* if */
} /* if */
if (in != NULL)
__PHYSFS_platformClose(in); /* Close this even with success. */
921
return(retval);
922
} /* ZIP_openArchive */
923
924
925
/* !!! FIXME: This is seriously ugly. */
926
927
928
static LinkedStringList *ZIP_enumerateFiles(DirHandle *h,
const char *dirname,
int omitSymLinks)
929
{
930
ZIPinfo *zi = (ZIPinfo *) (h->opaque);
931
unsigned int i;
932
int dlen;
933
934
935
936
LinkedStringList *retval = NULL;
LinkedStringList *l = NULL;
LinkedStringList *prev = NULL;
char *d;
937
938
ZIPentry *entry;
char buf[MAXZIPENTRYSIZE];
939
940
941
942
dlen = strlen(dirname);
d = malloc(dlen + 1);
BAIL_IF_MACRO(d == NULL, ERR_OUT_OF_MEMORY, NULL);
943
strcpy(d, dirname);
944
if ((dlen > 0) && (d[dlen - 1] == '/')) /* remove trailing slash. */
945
946
947
948
{
dlen--;
d[dlen] = '\0';
} /* if */
949
950
for (i = 0, entry = zi->entries; i < zi->entryCount; i++, entry++)
951
952
{
char *ptr;
953
954
955
char *add_file;
int this_dlen;
956
if ((omitSymLinks) && (entry->symlink != NULL))
957
958
continue;
959
this_dlen = strlen(entry->name);
960
if (this_dlen + 1 > MAXZIPENTRYSIZE) /* !!! FIXME */
961
962
963
964
continue; /* ugh. */
strcpy(buf, entry->name);
965
if ((this_dlen > 0) && (buf[this_dlen - 1] == '/')) /* no trailing slash. */
966
{
967
968
969
970
971
972
973
974
975
this_dlen--;
buf[this_dlen] = '\0';
} /* if */
if (this_dlen <= dlen) /* not in this dir. */
continue;
if (*d == '\0')
add_file = buf;
976
977
else
{
978
979
980
981
if (buf[dlen] != '/') /* can't be in same directory? */
continue;
buf[dlen] = '\0';
982
if (__PHYSFS_platformStricmp(d, buf) != 0) /* not same directory? */
983
984
985
continue;
add_file = buf + dlen + 1;
986
987
} /* else */
988
989
990
991
992
993
994
995
/* handle subdirectories... */
ptr = strchr(add_file, '/');
if (ptr != NULL)
{
LinkedStringList *j;
*ptr = '\0';
for (j = retval; j != NULL; j = j->next)
{
996
if (__PHYSFS_platformStricmp(j->str, ptr) == 0)
997
998
999
1000
break;
} /* for */
if (j != NULL)