/
archiver_zip.c
1441 lines (1169 loc) · 42.8 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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PHYSFS_Io *io;
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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. */
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PHYSFS_Io *io; /* physical file handle. */
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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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} /* 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;
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} /* zlib_err */
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static inline int readAll(PHYSFS_Io *io, void *buf, const PHYSFS_uint64 len)
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{
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return (io->read(io, buf, len) == len);
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} /* readAll */
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/*
* Read an unsigned 32-bit int and swap to native byte order.
*/
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static int readui32(PHYSFS_Io *io, PHYSFS_uint32 *val)
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{
PHYSFS_uint32 v;
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BAIL_IF_MACRO(!readAll(io, &v, sizeof (v)), NULL, 0);
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*val = PHYSFS_swapULE32(v);
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return 1;
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} /* readui32 */
/*
* Read an unsigned 16-bit int and swap to native byte order.
*/
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static int readui16(PHYSFS_Io *io, PHYSFS_uint16 *val)
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{
PHYSFS_uint16 v;
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BAIL_IF_MACRO(!readAll(io, &v, sizeof (v)), NULL, 0);
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*val = PHYSFS_swapULE16(v);
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return 1;
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} /* readui16 */
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static PHYSFS_sint64 ZIP_read(PHYSFS_Io *_io, void *buf, PHYSFS_uint64 len)
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{
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ZIPfileinfo *finfo = (ZIPfileinfo *) _io->opaque;
PHYSFS_Io *io = finfo->io;
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ZIPentry *entry = finfo->entry;
PHYSFS_sint64 retval = 0;
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PHYSFS_sint64 maxread = (PHYSFS_sint64) len;
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PHYSFS_sint64 avail = entry->uncompressed_size -
finfo->uncompressed_position;
if (avail < maxread)
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maxread = avail;
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BAIL_IF_MACRO(maxread == 0, NULL, 0); /* quick rejection. */
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if (entry->compression_method == COMPMETH_NONE)
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retval = io->read(io, buf, maxread);
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else
{
finfo->stream.next_out = buf;
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finfo->stream.avail_out = maxread;
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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;
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br = io->read(io, finfo->buffer, (PHYSFS_uint64) 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 */
} /* else */
if (retval > 0)
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finfo->uncompressed_position += (PHYSFS_uint32) retval;
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return retval;
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} /* ZIP_read */
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static PHYSFS_sint64 ZIP_write(PHYSFS_Io *io, const void *b, PHYSFS_uint64 len)
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{
BAIL_MACRO(ERR_NOT_SUPPORTED, -1);
} /* ZIP_write */
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static PHYSFS_sint64 ZIP_tell(PHYSFS_Io *io)
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{
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return ((ZIPfileinfo *) io->opaque)->uncompressed_position;
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} /* ZIP_tell */
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static int ZIP_seek(PHYSFS_Io *_io, PHYSFS_uint64 offset)
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{
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ZIPfileinfo *finfo = (ZIPfileinfo *) _io->opaque;
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ZIPentry *entry = finfo->entry;
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PHYSFS_Io *io = finfo->io;
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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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const PHYSFS_sint64 newpos = offset + entry->offset;
BAIL_IF_MACRO(!io->seek(io, 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)
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return 0;
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if (!io->seek(io, entry->offset))
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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];
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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(_io, buf, maxread) != maxread)
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return 0;
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} /* while */
} /* else */
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return 1;
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} /* ZIP_seek */
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static PHYSFS_sint64 ZIP_length(PHYSFS_Io *io)
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{
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const ZIPfileinfo *finfo = (ZIPfileinfo *) io->opaque;
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return finfo->entry->uncompressed_size;
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} /* ZIP_length */
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static PHYSFS_Io *zip_get_io(PHYSFS_Io *io, ZIPinfo *inf, ZIPentry *entry);
static PHYSFS_Io *ZIP_duplicate(PHYSFS_Io *io)
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{
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ZIPfileinfo *origfinfo = (ZIPfileinfo *) io->opaque;
PHYSFS_Io *retval = (PHYSFS_Io *) allocator.Malloc(sizeof (PHYSFS_Io));
ZIPfileinfo *finfo = (ZIPfileinfo *) allocator.Malloc(sizeof (ZIPfileinfo));
GOTO_IF_MACRO(retval == NULL, ERR_OUT_OF_MEMORY, ZIP_duplicate_failed);
GOTO_IF_MACRO(finfo == NULL, ERR_OUT_OF_MEMORY, ZIP_duplicate_failed);
memset(finfo, '\0', sizeof (*finfo));
finfo->entry = origfinfo->entry;
finfo->io = zip_get_io(origfinfo->io, NULL, finfo->entry);
GOTO_IF_MACRO(finfo->io == NULL, NULL, ZIP_duplicate_failed);
if (finfo->entry->compression_method != COMPMETH_NONE)
{
finfo->buffer = (PHYSFS_uint8 *) allocator.Malloc(ZIP_READBUFSIZE);
GOTO_IF_MACRO(!finfo->buffer, ERR_OUT_OF_MEMORY, ZIP_duplicate_failed);
if (zlib_err(inflateInit2(&finfo->stream, -MAX_WBITS)) != Z_OK)
goto ZIP_duplicate_failed;
} /* if */
memcpy(retval, io, sizeof (PHYSFS_Io));
retval->opaque = finfo;
return retval;
ZIP_duplicate_failed:
if (finfo != NULL)
{
if (finfo->io != NULL)
finfo->io->destroy(finfo->io);
if (finfo->buffer != NULL)
{
allocator.Free(finfo->buffer);
inflateEnd(&finfo->stream);
} /* if */
allocator.Free(finfo);
} /* if */
if (retval != NULL)
allocator.Free(retval);
return NULL;
} /* ZIP_duplicate */
static int ZIP_flush(PHYSFS_Io *io) { return 1; /* no write support. */ }
static void ZIP_destroy(PHYSFS_Io *io)
{
ZIPfileinfo *finfo = (ZIPfileinfo *) io->opaque;
finfo->io->destroy(finfo->io);
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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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allocator.Free(io);
} /* ZIP_destroy */
static const PHYSFS_Io ZIP_Io =
{
ZIP_read,
ZIP_write,
ZIP_seek,
ZIP_tell,
ZIP_length,
ZIP_duplicate,
ZIP_flush,
ZIP_destroy,
NULL
};
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static PHYSFS_sint64 zip_find_end_of_central_dir(PHYSFS_Io *io, 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 = io->length(io);
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BAIL_IF_MACRO(filelen == -1, NULL, 0); /* !!! FIXME: unlocalized string */
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BAIL_IF_MACRO(filelen > 0xFFFFFFFF, "ZIP bigger than 4 gigs?!", 0);
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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(!io->seek(io, filepos), NULL, -1);
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/* make sure we catch a signature between buffers. */
if (totalread != 0)
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{
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if (!readAll(io, buf, maxread - 4))
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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
{
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if (!readAll(io, buf, maxread))
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return -1;
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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);
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} /* zip_find_end_of_central_dir */
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static int isZip(PHYSFS_Io *io)
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{
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PHYSFS_uint32 sig = 0;
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int retval = 0;
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/*
* 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(io, &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...
*/
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retval = (zip_find_end_of_central_dir(io, NULL) != -1);
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} /* if */
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} /* if */
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return retval;
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} /* isZip */
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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.
*/
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static ZIPentry *zip_find_entry(const 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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if (isDir != NULL)
{
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*isDir = (thispath[pathlen] == '/');
if (*isDir)
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return NULL;
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} /* if */
if (thispath[pathlen] == '\0') /* found entry? */
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return &a[middle];
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else
hi = middle - 1; /* adjust search params, try again. */
} /* if */
} /* 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 */
661
662
663
664
665
666
667
668
669
670
671
672
673
674
if (*(ptr + 3) == '\0')
{
/* parent dir at end: move back one, if possible. */
*prevptr = '\0';
} /* if */
} /* if */
} /* if */
else
{
prevptr = ptr;
} /* else */
} /* while */
} /* zip_expand_symlink_path */
675
676
/* (forward reference: zip_follow_symlink and zip_resolve call each other.) */
677
static int zip_resolve(PHYSFS_Io *io, ZIPinfo *info, ZIPentry *entry);
678
679
/*
680
681
682
683
684
* 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.
685
*/
686
static ZIPentry *zip_follow_symlink(PHYSFS_Io *io, ZIPinfo *info, char *path)
687
{
688
689
690
ZIPentry *entry;
zip_expand_symlink_path(path);
691
entry = zip_find_entry(info, path, NULL);
692
693
if (entry != NULL)
{
694
if (!zip_resolve(io, info, entry)) /* recursive! */
695
696
697
698
699
700
701
702
entry = NULL;
else
{
if (entry->symlink != NULL)
entry = entry->symlink;
} /* else */
} /* if */
703
allocator.Free(path);
704
return entry;
705
} /* zip_follow_symlink */
706
707
708
static int zip_resolve_symlink(PHYSFS_Io *io, ZIPinfo *info, ZIPentry *entry)
709
{
710
char *path;
711
const PHYSFS_uint32 size = entry->uncompressed_size;
712
713
int rc = 0;
714
715
716
717
718
719
/*
* 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.
*/
720
BAIL_IF_MACRO(!io->seek(io, entry->offset), NULL, 0);
721
722
path = (char *) allocator.Malloc(size + 1);
723
BAIL_IF_MACRO(path == NULL, ERR_OUT_OF_MEMORY, 0);
724
725
if (entry->compression_method == COMPMETH_NONE)
726
rc = readAll(io, path, size);
727
728
729
730
else /* symlink target path is compressed... */
{
z_stream stream;
731
const PHYSFS_uint32 complen = entry->compressed_size;
732
PHYSFS_uint8 *compressed = (PHYSFS_uint8*) __PHYSFS_smallAlloc(complen);
733
734
if (compressed != NULL)
{
735
if (readAll(io, compressed, complen))
736
{
737
initializeZStream(&stream);
738
stream.next_in = compressed;
739
stream.avail_in = complen;
740
stream.next_out = (unsigned char *) path;
741
742
743
stream.avail_out = size;
if (zlib_err(inflateInit2(&stream, -MAX_WBITS)) == Z_OK)
{
744
rc = zlib_err(inflate(&stream, Z_FINISH));
745
inflateEnd(&stream);
746
747
748
/* both are acceptable outcomes... */
rc = ((rc == Z_OK) || (rc == Z_STREAM_END));
749
750
} /* if */
} /* if */
751
__PHYSFS_smallFree(compressed);
752
753
} /* if */
} /* else */
754
755
if (!rc)
756
allocator.Free(path);
757
758
759
760
else
{
path[entry->uncompressed_size] = '\0'; /* null-terminate it. */
zip_convert_dos_path(entry, path);
761
entry->symlink = zip_follow_symlink(io, info, path);
762
763
} /* else */
764
return (entry->symlink != NULL);
765
766
767
768
769
770
} /* zip_resolve_symlink */
/*
* Parse the local file header of an entry, and update entry->offset.
*/
771
static int zip_parse_local(PHYSFS_Io *io, ZIPentry *entry)
772
773
774
775
776
777
{
PHYSFS_uint32 ui32;
PHYSFS_uint16 ui16;
PHYSFS_uint16 fnamelen;
PHYSFS_uint16 extralen;
778
779
780
781
782
783
784
/*
* 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.
*/
785
786
BAIL_IF_MACRO(!io->seek(io, entry->offset), NULL, 0);
BAIL_IF_MACRO(!readui32(io, &ui32), NULL, 0);
787
BAIL_IF_MACRO(ui32 != ZIP_LOCAL_FILE_SIG, ERR_CORRUPTED, 0);
788
BAIL_IF_MACRO(!readui16(io, &ui16), NULL, 0);
789
BAIL_IF_MACRO(ui16 != entry->version_needed, ERR_CORRUPTED, 0);
790
791
BAIL_IF_MACRO(!readui16(io, &ui16), NULL, 0); /* general bits. */
BAIL_IF_MACRO(!readui16(io, &ui16), NULL, 0);
792
BAIL_IF_MACRO(ui16 != entry->compression_method, ERR_CORRUPTED, 0);
793
794
BAIL_IF_MACRO(!readui32(io, &ui32), NULL, 0); /* date/time */
BAIL_IF_MACRO(!readui32(io, &ui32), NULL, 0);
795
BAIL_IF_MACRO(ui32 && (ui32 != entry->crc), ERR_CORRUPTED, 0);
796
BAIL_IF_MACRO(!readui32(io, &ui32), NULL, 0);
797
BAIL_IF_MACRO(ui32 && (ui32 != entry->compressed_size), ERR_CORRUPTED, 0);
798
BAIL_IF_MACRO(!readui32(io, &ui32), NULL, 0);
799
BAIL_IF_MACRO(ui32 && (ui32 != entry->uncompressed_size),ERR_CORRUPTED,0);
800
801
BAIL_IF_MACRO(!readui16(io, &fnamelen), NULL, 0);
BAIL_IF_MACRO(!readui16(io, &extralen), NULL, 0);
802
803
entry->offset += fnamelen + extralen + 30;
804
return 1;
805
806
807
} /* zip_parse_local */
808
static int zip_resolve(PHYSFS_Io *io, ZIPinfo *info, ZIPentry *entry)
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
{
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;
831
retval = zip_parse_local(io, entry);
832
833
834
835
836
837
838
839
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)
840
retval = zip_resolve_symlink(io, info, entry);
841
842
843
844
845
846
} /* 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);
847
} /* if */
848
849
return retval;
850
} /* zip_resolve */
851
852
853
static int zip_version_does_symlinks(PHYSFS_uint32 version)
854
855
{
int retval = 0;
856
PHYSFS_uint8 hosttype = (PHYSFS_uint8) ((version >> 8) & 0xFF);
857
858
859
switch (hosttype)
{
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
/*
* 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. */
877
878
879
880
retval = 1;
break;
} /* switch */
881
return retval;
882
883
884
} /* zip_version_does_symlinks */
885
static int zip_entry_is_symlink(const ZIPentry *entry)
886
{
887
888
889
return ((entry->resolved == ZIP_UNRESOLVED_SYMLINK) ||
(entry->resolved == ZIP_BROKEN_SYMLINK) ||
(entry->symlink));
890
} /* zip_entry_is_symlink */
891
892
893
static int zip_has_symlink_attr(ZIPentry *entry, PHYSFS_uint32 extern_attr)
894
{
895
PHYSFS_uint16 xattr = ((extern_attr >> 16) & 0xFFFF);
896
897
898
return ( (zip_version_does_symlinks(entry->version)) &&
(entry->uncompressed_size > 0) &&
((xattr & UNIX_FILETYPE_MASK) == UNIX_FILETYPE_SYMLINK) );
899
} /* zip_has_symlink_attr */
900
901
902
static PHYSFS_sint64 zip_dos_time_to_physfs_time(PHYSFS_uint32 dostime)
903
{
904
#ifdef _WIN32_WCE
905
906
907
/* We have no struct tm and no mktime right now.
FIXME: This should probably be fixed at some point.
*/
908
909
return -1;
#else
910
PHYSFS_uint32 dosdate;
911
912
struct tm unixtime;
memset(&unixtime, '\0', sizeof (unixtime));
913
914
915
dosdate = (PHYSFS_uint32) ((dostime >> 16) & 0xFFFF);
dostime &= 0xFFFF;
916
917
918
919
920
921
922
923
924
925
926
927
928
/* 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;
929
930
return ((PHYSFS_sint64) mktime(&unixtime));
931
#endif
932
} /* zip_dos_time_to_physfs_time */
933
934
935
static int zip_load_entry(PHYSFS_Io *io, ZIPentry *entry, PHYSFS_uint32 ofs_fixup)
936
937
938
939
940
941
942
943
{
PHYSFS_uint16 fnamelen, extralen, commentlen;
PHYSFS_uint32 external_attr;
PHYSFS_uint16 ui16;
PHYSFS_uint32 ui32;
PHYSFS_sint64 si64;
/* sanity check with central directory signature... */
944
BAIL_IF_MACRO(!readui32(io, &ui32), NULL, 0);
945
946
947
BAIL_IF_MACRO(ui32 != ZIP_CENTRAL_DIR_SIG, ERR_CORRUPTED, 0);
/* Get the pertinent parts of the record... */
948
949
950
951
952
BAIL_IF_MACRO(!readui16(io, &entry->version), NULL, 0);
BAIL_IF_MACRO(!readui16(io, &entry->version_needed), NULL, 0);
BAIL_IF_MACRO(!readui16(io, &ui16), NULL, 0); /* general bits */
BAIL_IF_MACRO(!readui16(io, &entry->compression_method), NULL, 0);
BAIL_IF_MACRO(!readui32(io, &ui32), NULL, 0);
953
entry->last_mod_time = zip_dos_time_to_physfs_time(ui32);
954
955
956
957
958
959
960
961
962
963
BAIL_IF_MACRO(!readui32(io, &entry->crc), NULL, 0);
BAIL_IF_MACRO(!readui32(io, &entry->compressed_size), NULL, 0);
BAIL_IF_MACRO(!readui32(io, &entry->uncompressed_size), NULL, 0);
BAIL_IF_MACRO(!readui16(io, &fnamelen), NULL, 0);
BAIL_IF_MACRO(!readui16(io, &extralen), NULL, 0);
BAIL_IF_MACRO(!readui16(io, &commentlen), NULL, 0);
BAIL_IF_MACRO(!readui16(io, &ui16), NULL, 0); /* disk number start */
BAIL_IF_MACRO(!readui16(io, &ui16), NULL, 0); /* internal file attribs */
BAIL_IF_MACRO(!readui32(io, &external_attr), NULL, 0);
BAIL_IF_MACRO(!readui32(io, &entry->offset), NULL, 0);
964
entry->offset += ofs_fixup;
965
966
967
968
entry->symlink = NULL; /* will be resolved later, if necessary. */
entry->resolved = (zip_has_symlink_attr(entry, external_attr)) ?
ZIP_UNRESOLVED_SYMLINK : ZIP_UNRESOLVED_FILE;
969
970
entry->name = (char *) allocator.Malloc(fnamelen + 1);
971
BAIL_IF_MACRO(entry->name == NULL, ERR_OUT_OF_MEMORY, 0);
972
if (!readAll(io, entry->name, fnamelen))
973
goto zip_load_entry_puked;
974
975
entry->name[fnamelen] = '\0'; /* null-terminate the filename. */
976
zip_convert_dos_path(entry, entry->name);
977
978
si64 = io->tell(io);
979
if (si64 == -1)
980
goto zip_load_entry_puked;
981
982
/* seek to the start of the next entry in the central directory... */
983
if (!io->seek(io, si64 + extralen + commentlen))
984
goto zip_load_entry_puked;
985
986
return 1; /* success. */
987
988
zip_load_entry_puked:
989
allocator.Free(entry->name);
990
return 0; /* failure. */
991
992
993
} /* zip_load_entry */
994
static int zip_entry_cmp(void *_a, PHYSFS_uint32 one, PHYSFS_uint32 two)
995
{
996
997
998
if (one != two)
{
const ZIPentry *a = (const ZIPentry *) _a;
999
return strcmp(a[one].name, a[two].name);
1000
} /* if */