/
zip.c
1473 lines (1200 loc) · 44.5 KB
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/*
* ZIP support routines for PhysicsFS.
*
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* Please see the file LICENSE.txt in the source's root directory.
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*
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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 (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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#ifndef _WIN32_WCE
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#include <errno.h>
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#include <time.h>
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#endif
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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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/*
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* A buffer of ZIP_READBUFSIZE is allocated for each compressed file opened,
* and is freed when you close the file; compressed data is read into
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* 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)
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/*
* Entries are "unresolved" until they are first opened. At that time,
* local file headers parsed/validated, data offsets will be updated to look
* at the actual file data instead of the header, and symlinks will be
* followed and optimized. This means that we don't seek and read around the
* archive until forced to do so, and after the first time, we had to do
* less reading and parsing, which is very CD-ROM friendly.
*/
typedef enum
{
ZIP_UNRESOLVED_FILE,
ZIP_UNRESOLVED_SYMLINK,
ZIP_RESOLVING,
ZIP_RESOLVED,
ZIP_BROKEN_FILE,
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ZIP_BROKEN_SYMLINK
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} ZipResolveType;
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/*
* One ZIPentry is kept for each file in an open ZIP archive.
*/
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typedef struct _ZIPentry
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{
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char *name; /* Name of file in archive */
struct _ZIPentry *symlink; /* NULL or file we symlink to */
ZipResolveType resolved; /* Have we resolved file/symlink? */
PHYSFS_uint32 offset; /* offset of data in archive */
PHYSFS_uint16 version; /* version made by */
PHYSFS_uint16 version_needed; /* version needed to extract */
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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/*
* Bridge physfs allocation functions to zlib's format...
*/
static voidpf zlibPhysfsAlloc(voidpf opaque, uInt items, uInt size)
{
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return(((PHYSFS_Allocator *) opaque)->Malloc(items * size));
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} /* zlibPhysfsAlloc */
/*
* Bridge physfs allocation functions to zlib's format...
*/
static void zlibPhysfsFree(voidpf opaque, voidpf address)
{
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((PHYSFS_Allocator *) opaque)->Free(address);
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} /* zlibPhysfsFree */
/*
* Construct a new z_stream to a sane state.
*/
static void initializeZStream(z_stream *pstr)
{
memset(pstr, '\0', sizeof (z_stream));
pstr->zalloc = zlibPhysfsAlloc;
pstr->zfree = zlibPhysfsFree;
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pstr->opaque = &allocator;
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} /* initializeZStream */
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static const char *zlib_error_string(int rc)
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{
switch (rc)
{
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case Z_OK: return(NULL); /* not an error. */
case Z_STREAM_END: return(NULL); /* not an error. */
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#ifndef _WIN32_WCE
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case Z_ERRNO: return(strerror(errno));
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#endif
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case Z_NEED_DICT: return(ERR_NEED_DICT);
case Z_DATA_ERROR: return(ERR_DATA_ERROR);
case Z_MEM_ERROR: return(ERR_MEMORY_ERROR);
case Z_BUF_ERROR: return(ERR_BUFFER_ERROR);
case Z_VERSION_ERROR: return(ERR_VERSION_ERROR);
default: return(ERR_UNKNOWN_ERROR);
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} /* switch */
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return(NULL);
} /* zlib_error_string */
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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 *str = zlib_error_string(rc);
if (str != NULL)
__PHYSFS_setError(str);
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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 */
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static PHYSFS_sint64 ZIP_read(fvoid *opaque, void *buf,
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PHYSFS_uint32 objSize, PHYSFS_uint32 objCount)
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{
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ZIPfileinfo *finfo = (ZIPfileinfo *) opaque;
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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);
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objCount = (PHYSFS_uint32) (maxread / objSize);
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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,
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1, (PHYSFS_uint32) br);
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if (br <= 0)
break;
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finfo->compressed_position += (PHYSFS_uint32) br;
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finfo->stream.next_in = finfo->buffer;
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finfo->stream.avail_in = (PHYSFS_uint32) br;
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} /* 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)
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finfo->uncompressed_position += (PHYSFS_uint32) (retval * objSize);
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return(retval);
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} /* ZIP_read */
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static PHYSFS_sint64 ZIP_write(fvoid *opaque, const void *buf,
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PHYSFS_uint32 objSize, PHYSFS_uint32 objCount)
{
BAIL_MACRO(ERR_NOT_SUPPORTED, -1);
} /* ZIP_write */
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static int ZIP_eof(fvoid *opaque)
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{
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ZIPfileinfo *finfo = (ZIPfileinfo *) opaque;
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return(finfo->uncompressed_position >= finfo->entry->uncompressed_size);
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} /* ZIP_eof */
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static PHYSFS_sint64 ZIP_tell(fvoid *opaque)
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{
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return(((ZIPfileinfo *) opaque)->uncompressed_position);
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} /* ZIP_tell */
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static int ZIP_seek(fvoid *opaque, PHYSFS_uint64 offset)
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{
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ZIPfileinfo *finfo = (ZIPfileinfo *) opaque;
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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);
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finfo->uncompressed_position = (PHYSFS_uint32) offset;
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} /* 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
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* decode, but we don't rewind first.
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*/
if (offset < finfo->uncompressed_position)
{
/* we do a copy so state is sane if inflateInit2() fails. */
z_stream str;
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initializeZStream(&str);
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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);
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inflateCopy(&finfo->stream, &str);
inflateEnd(&str);
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finfo->uncompressed_position = finfo->compressed_position = 0;
} /* if */
while (finfo->uncompressed_position != offset)
{
PHYSFS_uint8 buf[512];
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PHYSFS_uint32 maxread;
maxread = (PHYSFS_uint32) (offset - finfo->uncompressed_position);
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if (maxread > sizeof (buf))
maxread = sizeof (buf);
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if (ZIP_read(finfo, buf, maxread, 1) != 1)
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return(0);
} /* while */
} /* else */
return(1);
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} /* ZIP_seek */
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static PHYSFS_sint64 ZIP_fileLength(fvoid *opaque)
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{
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ZIPfileinfo *finfo = (ZIPfileinfo *) opaque;
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return(finfo->entry->uncompressed_size);
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} /* ZIP_fileLength */
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static int ZIP_fileClose(fvoid *opaque)
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{
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ZIPfileinfo *finfo = (ZIPfileinfo *) opaque;
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BAIL_IF_MACRO(!__PHYSFS_platformClose(finfo->handle), NULL, 0);
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if (finfo->entry->compression_method != COMPMETH_NONE)
inflateEnd(&finfo->stream);
if (finfo->buffer != NULL)
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allocator.Free(finfo->buffer);
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allocator.Free(finfo);
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return(1);
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} /* ZIP_fileClose */
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static PHYSFS_sint64 zip_find_end_of_central_dir(void *in, PHYSFS_sint64 *len)
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{
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PHYSFS_uint8 buf[256];
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PHYSFS_uint8 extra[4] = { 0, 0, 0, 0 };
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PHYSFS_sint32 i = 0;
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PHYSFS_sint64 filelen;
PHYSFS_sint64 filepos;
PHYSFS_sint32 maxread;
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PHYSFS_sint32 totalread = 0;
int found = 0;
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filelen = __PHYSFS_platformFileLength(in);
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BAIL_IF_MACRO(filelen == -1, NULL, -1); /* !!! FIXME: unlocalized string */
BAIL_IF_MACRO(filelen > 0xFFFFFFFF, "ZIP bigger than 2 gigs?!", -1);
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/*
* 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
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* searching for that signature after a little more than 64k at most,
* and call it a corrupted zipfile.
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*/
if (sizeof (buf) < filelen)
{
filepos = filelen - sizeof (buf);
maxread = sizeof (buf);
} /* if */
else
{
filepos = 0;
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maxread = (PHYSFS_uint32) filelen;
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} /* else */
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while ((totalread < filelen) && (totalread < 65557))
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{
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BAIL_IF_MACRO(!__PHYSFS_platformSeek(in, filepos), NULL, -1);
/* make sure we catch a signature between buffers. */
if (totalread != 0)
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{
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if (__PHYSFS_platformRead(in, buf, maxread - 4, 1) != 1)
return(-1);
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memcpy(&buf[maxread - 4], &extra, sizeof (extra));
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totalread += maxread - 4;
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} /* if */
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else
{
if (__PHYSFS_platformRead(in, buf, maxread, 1) != 1)
return(-1);
totalread += maxread;
} /* else */
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memcpy(&extra, buf, sizeof (extra));
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for (i = maxread - 4; i > 0; i--)
{
if ((buf[i + 0] == 0x50) &&
(buf[i + 1] == 0x4B) &&
(buf[i + 2] == 0x05) &&
(buf[i + 3] == 0x06) )
{
found = 1; /* that's the signature! */
break;
} /* if */
} /* for */
if (found)
break;
filepos -= (maxread - 4);
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if (filepos < 0)
filepos = 0;
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} /* while */
BAIL_IF_MACRO(!found, ERR_NOT_AN_ARCHIVE, -1);
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if (len != NULL)
*len = filelen;
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return(filepos + i);
} /* zip_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;
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int retval = 0;
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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.
*/
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if (readui32(in, &sig))
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{
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retval = (sig == ZIP_LOCAL_FILE_SIG);
if (!retval)
{
/*
* 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 = (zip_find_end_of_central_dir(in, NULL) != -1);
} /* if */
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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 void zip_free_entries(ZIPentry *entries, PHYSFS_uint32 max)
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{
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PHYSFS_uint32 i;
for (i = 0; i < max; i++)
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{
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ZIPentry *entry = &entries[i];
if (entry->name != NULL)
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allocator.Free(entry->name);
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} /* for */
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allocator.Free(entries);
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} /* zip_free_entries */
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/*
* This will find the ZIPentry associated with a path in platform-independent
* notation. Directories don't have ZIPentries associated with them, but
* (*isDir) will be set to non-zero if a dir was hit.
*/
static ZIPentry *zip_find_entry(ZIPinfo *info, const char *path, int *isDir)
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{
ZIPentry *a = info->entries;
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PHYSFS_sint32 pathlen = strlen(path);
PHYSFS_sint32 lo = 0;
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PHYSFS_sint32 hi = (PHYSFS_sint32) (info->entryCount - 1);
PHYSFS_sint32 middle;
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const char *thispath = NULL;
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int rc;
while (lo <= hi)
{
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middle = lo + ((hi - lo) / 2);
thispath = a[middle].name;
rc = strncmp(path, thispath, pathlen);
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if (rc > 0)
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lo = middle + 1;
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else if (rc < 0)
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hi = middle - 1;
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else /* substring match...might be dir or entry or nothing. */
{
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int i;
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if (isDir != NULL)
{
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*isDir = (thispath[pathlen] == '/');
if (*isDir)
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return(NULL);
} /* if */
if (thispath[pathlen] == '\0') /* found entry? */
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return(&a[middle]);
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/* substring match; search remaining space to find it... */
for (i = lo; i < hi; i++)
{
thispath = a[i].name;
if (strncmp(path, thispath, pathlen) == 0)
{
if (isDir != NULL)
{
*isDir = (thispath[pathlen] == '/');
if (*isDir)
return(NULL);
} /* if */
if (thispath[pathlen] == '\0') /* found entry? */
return(&a[i]);
} /* if */
} /* for */
break;
} /* else */
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} /* while */
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if (isDir != NULL)
*isDir = 0;
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BAIL_MACRO(ERR_NO_SUCH_FILE, NULL);
} /* zip_find_entry */
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/* Convert paths from old, buggy DOS zippers... */
static void zip_convert_dos_path(ZIPentry *entry, char *path)
{
PHYSFS_uint8 hosttype = (PHYSFS_uint8) ((entry->version >> 8) & 0xFF);
if (hosttype == 0) /* FS_FAT_ */
{
while (*path)
{
if (*path == '\\')
*path = '/';
path++;
} /* while */
} /* if */
} /* zip_convert_dos_path */
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static void zip_expand_symlink_path(char *path)
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{
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char *ptr = path;
char *prevptr = path;
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while (1)
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{
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ptr = strchr(ptr, '/');
if (ptr == NULL)
break;
if (*(ptr + 1) == '.')
{
if (*(ptr + 2) == '/')
{
/* current dir in middle of string: ditch it. */
memmove(ptr, ptr + 2, strlen(ptr + 2) + 1);
} /* else if */
else if (*(ptr + 2) == '\0')
{
/* current dir at end of string: ditch it. */
*ptr = '\0';
} /* else if */
else if (*(ptr + 2) == '.')
{
if (*(ptr + 3) == '/')
{
/* parent dir in middle: move back one, if possible. */
memmove(prevptr, ptr + 4, strlen(ptr + 4) + 1);
ptr = prevptr;
while (prevptr != path)
{
prevptr--;
if (*prevptr == '/')
{
prevptr++;
break;
} /* if */
} /* while */
} /* if */
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if (*(ptr + 3) == '\0')
{
/* parent dir at end: move back one, if possible. */
*prevptr = '\0';
} /* if */
} /* if */
} /* if */
else
{
prevptr = ptr;
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ptr++;
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} /* else */
} /* while */
} /* zip_expand_symlink_path */
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/* (forward reference: zip_follow_symlink and zip_resolve call each other.) */
static int zip_resolve(void *in, ZIPinfo *info, ZIPentry *entry);
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/*
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* Look for the entry named by (path). If it exists, resolve it, and return
* a pointer to that entry. If it's another symlink, keep resolving until you
* hit a real file and then return a pointer to the final non-symlink entry.
* If there's a problem, return NULL. (path) is always free()'d by this
* function.
663
*/
664
static ZIPentry *zip_follow_symlink(void *in, ZIPinfo *info, char *path)
665
{
666
667
668
ZIPentry *entry;
zip_expand_symlink_path(path);
669
entry = zip_find_entry(info, path, NULL);
670
671
672
673
674
675
676
677
678
679
680
if (entry != NULL)
{
if (!zip_resolve(in, info, entry)) /* recursive! */
entry = NULL;
else
{
if (entry->symlink != NULL)
entry = entry->symlink;
} /* else */
} /* if */
681
allocator.Free(path);
682
683
return(entry);
} /* zip_follow_symlink */
684
685
686
static int zip_resolve_symlink(void *in, ZIPinfo *info, ZIPentry *entry)
687
{
688
689
690
691
char *path;
PHYSFS_uint32 size = entry->uncompressed_size;
int rc = 0;
692
693
694
695
696
697
698
699
/*
* We've already parsed the local file header of the symlink at this
* point. Now we need to read the actual link from the file data and
* follow it.
*/
BAIL_IF_MACRO(!__PHYSFS_platformSeek(in, entry->offset), NULL, 0);
700
path = (char *) allocator.Malloc(size + 1);
701
BAIL_IF_MACRO(path == NULL, ERR_OUT_OF_MEMORY, 0);
702
703
704
705
706
707
708
if (entry->compression_method == COMPMETH_NONE)
rc = (__PHYSFS_platformRead(in, path, size, 1) == 1);
else /* symlink target path is compressed... */
{
z_stream stream;
709
710
PHYSFS_uint32 complen = entry->compressed_size;
PHYSFS_uint8 *compressed = (PHYSFS_uint8*) __PHYSFS_smallAlloc(complen);
711
712
if (compressed != NULL)
{
713
if (__PHYSFS_platformRead(in, compressed, complen, 1) == 1)
714
{
715
initializeZStream(&stream);
716
stream.next_in = compressed;
717
stream.avail_in = complen;
718
stream.next_out = (unsigned char *) path;
719
720
721
stream.avail_out = size;
if (zlib_err(inflateInit2(&stream, -MAX_WBITS)) == Z_OK)
{
722
rc = zlib_err(inflate(&stream, Z_FINISH));
723
inflateEnd(&stream);
724
725
726
/* both are acceptable outcomes... */
rc = ((rc == Z_OK) || (rc == Z_STREAM_END));
727
728
} /* if */
} /* if */
729
__PHYSFS_smallFree(compressed);
730
731
} /* if */
} /* else */
732
733
if (!rc)
734
allocator.Free(path);
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
else
{
path[entry->uncompressed_size] = '\0'; /* null-terminate it. */
zip_convert_dos_path(entry, path);
entry->symlink = zip_follow_symlink(in, info, path);
} /* else */
return(entry->symlink != NULL);
} /* zip_resolve_symlink */
/*
* Parse the local file header of an entry, and update entry->offset.
*/
static int zip_parse_local(void *in, ZIPentry *entry)
{
PHYSFS_uint32 ui32;
PHYSFS_uint16 ui16;
PHYSFS_uint16 fnamelen;
PHYSFS_uint16 extralen;
756
757
758
759
760
761
762
/*
* crc and (un)compressed_size are always zero if this is a "JAR"
* archive created with Sun's Java tools, apparently. We only
* consider this archive corrupted if those entries don't match and
* aren't zero. That seems to work well.
*/
763
764
765
766
767
768
769
770
771
772
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);
773
BAIL_IF_MACRO(ui32 && (ui32 != entry->crc), ERR_CORRUPTED, 0);
774
BAIL_IF_MACRO(!readui32(in, &ui32), NULL, 0);
775
BAIL_IF_MACRO(ui32 && (ui32 != entry->compressed_size), ERR_CORRUPTED, 0);
776
BAIL_IF_MACRO(!readui32(in, &ui32), NULL, 0);
777
BAIL_IF_MACRO(ui32 && (ui32 != entry->uncompressed_size),ERR_CORRUPTED,0);
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
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
BAIL_IF_MACRO(!readui16(in, &fnamelen), NULL, 0);
BAIL_IF_MACRO(!readui16(in, &extralen), NULL, 0);
entry->offset += fnamelen + extralen + 30;
return(1);
} /* zip_parse_local */
static int zip_resolve(void *in, ZIPinfo *info, ZIPentry *entry)
{
int retval = 1;
ZipResolveType resolve_type = entry->resolved;
/* Don't bother if we've failed to resolve this entry before. */
BAIL_IF_MACRO(resolve_type == ZIP_BROKEN_FILE, ERR_CORRUPTED, 0);
BAIL_IF_MACRO(resolve_type == ZIP_BROKEN_SYMLINK, ERR_CORRUPTED, 0);
/* uhoh...infinite symlink loop! */
BAIL_IF_MACRO(resolve_type == ZIP_RESOLVING, ERR_SYMLINK_LOOP, 0);
/*
* 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 (resolve_type != ZIP_RESOLVED)
{
entry->resolved = ZIP_RESOLVING;
retval = zip_parse_local(in, entry);
if (retval)
{
/*
* If it's a symlink, find the original file. This will cause
* resolution of other entries (other symlinks and, eventually,
* the real file) if all goes well.
*/
if (resolve_type == ZIP_UNRESOLVED_SYMLINK)
retval = zip_resolve_symlink(in, info, entry);
} /* if */
if (resolve_type == ZIP_UNRESOLVED_SYMLINK)
entry->resolved = ((retval) ? ZIP_RESOLVED : ZIP_BROKEN_SYMLINK);
else if (resolve_type == ZIP_UNRESOLVED_FILE)
entry->resolved = ((retval) ? ZIP_RESOLVED : ZIP_BROKEN_FILE);
825
} /* if */
826
827
828
return(retval);
} /* zip_resolve */
829
830
831
static int zip_version_does_symlinks(PHYSFS_uint32 version)
832
833
{
int retval = 0;
834
PHYSFS_uint8 hosttype = (PHYSFS_uint8) ((version >> 8) & 0xFF);
835
836
837
switch (hosttype)
{
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
/*
* 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. */
855
856
857
858
859
retval = 1;
break;
} /* switch */
return(retval);
860
861
862
} /* zip_version_does_symlinks */
863
static int zip_entry_is_symlink(const ZIPentry *entry)
864
865
866
867
868
{
return((entry->resolved == ZIP_UNRESOLVED_SYMLINK) ||
(entry->resolved == ZIP_BROKEN_SYMLINK) ||
(entry->symlink));
} /* zip_entry_is_symlink */
869
870
871
static int zip_has_symlink_attr(ZIPentry *entry, PHYSFS_uint32 extern_attr)
872
{
873
874
PHYSFS_uint16 xattr = ((extern_attr >> 16) & 0xFFFF);
875
return (
876
(zip_version_does_symlinks(entry->version)) &&
877
(entry->uncompressed_size > 0) &&
878
((xattr & UNIX_FILETYPE_MASK) == UNIX_FILETYPE_SYMLINK)
879
);
880
} /* zip_has_symlink_attr */
881
882
883
static PHYSFS_sint64 zip_dos_time_to_physfs_time(PHYSFS_uint32 dostime)
884
{
885
#ifdef _WIN32_WCE
886
887
888
/* We have no struct tm and no mktime right now.
FIXME: This should probably be fixed at some point.
*/
889
890
return -1;
#else
891
PHYSFS_uint32 dosdate;
892
893
struct tm unixtime;
memset(&unixtime, '\0', sizeof (unixtime));
894
895
896
dosdate = (PHYSFS_uint32) ((dostime >> 16) & 0xFFFF);
dostime &= 0xFFFF;
897
898
899
900
901
902
903
904
905
906
907
908
909
/* dissect date */
unixtime.tm_year = ((dosdate >> 9) & 0x7F) + 80;
unixtime.tm_mon = ((dosdate >> 5) & 0x0F) - 1;
unixtime.tm_mday = ((dosdate ) & 0x1F);
/* dissect time */
unixtime.tm_hour = ((dostime >> 11) & 0x1F);
unixtime.tm_min = ((dostime >> 5) & 0x3F);
unixtime.tm_sec = ((dostime << 1) & 0x3E);
/* let mktime calculate daylight savings time. */
unixtime.tm_isdst = -1;
910
911
return((PHYSFS_sint64) mktime(&unixtime));
912
#endif
913
} /* zip_dos_time_to_physfs_time */
914
915
916
static int zip_load_entry(void *in, ZIPentry *entry, PHYSFS_uint32 ofs_fixup)
917
918
919
920
921
922
923
924
925
926
927
928
929
930
{
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);
931
BAIL_IF_MACRO(!readui16(in, &ui16), NULL, 0); /* general bits */
932
933
BAIL_IF_MACRO(!readui16(in, &entry->compression_method), NULL, 0);
BAIL_IF_MACRO(!readui32(in, &ui32), NULL, 0);
934
entry->last_mod_time = zip_dos_time_to_physfs_time(ui32);
935
936
937
938
939
940
941
942
943
944
945
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;
946
947
948
949
entry->symlink = NULL; /* will be resolved later, if necessary. */
entry->resolved = (zip_has_symlink_attr(entry, external_attr)) ?
ZIP_UNRESOLVED_SYMLINK : ZIP_UNRESOLVED_FILE;
950
951
entry->name = (char *) allocator.Malloc(fnamelen + 1);
952
953
BAIL_IF_MACRO(entry->name == NULL, ERR_OUT_OF_MEMORY, 0);
if (__PHYSFS_platformRead(in, entry->name, fnamelen, 1) != 1)
954
goto zip_load_entry_puked;
955
956
entry->name[fnamelen] = '\0'; /* null-terminate the filename. */
957
zip_convert_dos_path(entry, entry->name);
958
959
960
si64 = __PHYSFS_platformTell(in);
if (si64 == -1)
961
goto zip_load_entry_puked;
962
963
964
/* seek to the start of the next entry in the central directory... */
if (!__PHYSFS_platformSeek(in, si64 + extralen + commentlen))
965
goto zip_load_entry_puked;
966
967
return(1); /* success. */
968
969
zip_load_entry_puked:
970
allocator.Free(entry->name);
971
return(0); /* failure. */
972
973
974
} /* zip_load_entry */
975
static int zip_entry_cmp(void *_a, PHYSFS_uint32 one, PHYSFS_uint32 two)
976
{
977
978
979
980
981
982
983
if (one != two)
{
const ZIPentry *a = (const ZIPentry *) _a;
return(strcmp(a[one].name, a[two].name));
} /* if */
return 0;
984
} /* zip_entry_cmp */
985
986
987
static void zip_entry_swap(void *_a, PHYSFS_uint32 one, PHYSFS_uint32 two)
988
{
989
990
991
992
993
994
995
996
997
if (one != two)
{
ZIPentry tmp;
ZIPentry *first = &(((ZIPentry *) _a)[one]);
ZIPentry *second = &(((ZIPentry *) _a)[two]);
memcpy(&tmp, first, sizeof (ZIPentry));
memcpy(first, second, sizeof (ZIPentry));
memcpy(second, &tmp, sizeof (ZIPentry));
} /* if */
998
} /* zip_entry_swap */
999
1000