/
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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/*
* When sorting the zip entries in an archive, we use a modified QuickSort.
* When there are less then ZIP_QUICKSORT_THRESHOLD entries left to sort,
* we switch over to an InsertionSort for the remainder. Tweak to taste.
*/
#define ZIP_QUICKSORT_THRESHOLD 4
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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)
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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,
ZIP_BROKEN_SYMLINK,
} 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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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);
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);
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static int zip_resolve(void *in, ZIPinfo *info, ZIPentry *entry);
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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
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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;
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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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)
free(finfo->buffer);
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free(finfo);
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_sint32 i;
PHYSFS_sint64 filelen;
PHYSFS_sint64 filepos;
PHYSFS_sint32 maxread;
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PHYSFS_sint32 totalread = 0;
int found = 0;
PHYSFS_uint32 extra;
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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
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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;
maxread = filelen;
} /* 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);
*((PHYSFS_uint32 *) (&buf[maxread - 4])) = extra;
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 */
extra = *((PHYSFS_uint32 *) (&buf[0]));
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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);
} /* 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;
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...
*/
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retval = (zip_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 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)
free(entry->name);
} /* for */
free(entries);
} /* zip_free_entries */
static ZIPentry *zip_find_entry(ZIPinfo *info, const char *path)
{
ZIPentry *a = info->entries;
PHYSFS_sint32 lo = 0;
PHYSFS_sint32 hi = (PHYSFS_sint32) (info->entryCount - 1);
PHYSFS_sint32 middle;
int rc;
while (lo <= hi)
{
middle = lo + ((hi - lo) / 2);
rc = strcmp(path, a[middle].name);
if (rc == 0) /* found it! */
return(&a[middle]);
else if (rc > 0)
lo = middle + 1;
else
hi = middle - 1;
} /* while */
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;
} /* else */
} /* while */
} /* zip_expand_symlink_path */
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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.
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*/
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static ZIPentry *zip_follow_symlink(void *in, ZIPinfo *info, char *path)
655
{
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
ZIPentry *entry;
zip_expand_symlink_path(path);
entry = zip_find_entry(info, path);
if (entry != NULL)
{
if (!zip_resolve(in, info, entry)) /* recursive! */
entry = NULL;
else
{
if (entry->symlink != NULL)
entry = entry->symlink;
} /* else */
} /* if */
free(path);
return(entry);
} /* zip_follow_symlink */
674
675
676
static int zip_resolve_symlink(void *in, ZIPinfo *info, ZIPentry *entry)
677
{
678
679
680
681
char *path;
PHYSFS_uint32 size = entry->uncompressed_size;
int rc = 0;
682
683
684
685
686
687
688
689
/*
* 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);
690
path = (char *) malloc(size + 1);
691
BAIL_IF_MACRO(path == NULL, ERR_OUT_OF_MEMORY, 0);
692
693
694
695
696
697
698
if (entry->compression_method == COMPMETH_NONE)
rc = (__PHYSFS_platformRead(in, path, size, 1) == 1);
else /* symlink target path is compressed... */
{
z_stream stream;
699
PHYSFS_uint32 compsize = entry->compressed_size;
700
701
702
703
704
705
706
707
708
709
710
711
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)
{
712
rc = zlib_err(inflate(&stream, Z_FINISH));
713
inflateEnd(&stream);
714
715
716
/* both are acceptable outcomes... */
rc = ((rc == Z_OK) || (rc == Z_STREAM_END));
717
718
719
720
721
} /* if */
} /* if */
free(compressed);
} /* if */
} /* else */
722
723
724
if (!rc)
free(path);
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732
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734
735
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737
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739
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766
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784
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789
790
791
792
793
794
795
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797
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799
800
801
802
803
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806
807
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;
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;
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);
808
} /* if */
809
810
811
return(retval);
} /* zip_resolve */
812
813
814
static int zip_version_does_symlinks(PHYSFS_uint32 version)
815
816
{
int retval = 0;
817
PHYSFS_uint8 hosttype = (PHYSFS_uint8) ((version >> 8) & 0xFF);
818
819
820
switch (hosttype)
{
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
/*
* 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. */
838
839
840
841
842
retval = 1;
break;
} /* switch */
return(retval);
843
844
845
846
847
848
849
850
851
} /* zip_version_does_symlinks */
static int zip_entry_is_symlink(ZIPentry *entry)
{
return((entry->resolved == ZIP_UNRESOLVED_SYMLINK) ||
(entry->resolved == ZIP_BROKEN_SYMLINK) ||
(entry->symlink));
} /* zip_entry_is_symlink */
852
853
854
static int zip_has_symlink_attr(ZIPentry *entry, PHYSFS_uint32 extern_attr)
855
{
856
857
PHYSFS_uint16 xattr = ((extern_attr >> 16) & 0xFFFF);
858
return (
859
(zip_version_does_symlinks(entry->version)) &&
860
(entry->uncompressed_size > 0) &&
861
((xattr & UNIX_FILETYPE_MASK) == UNIX_FILETYPE_SYMLINK)
862
);
863
} /* zip_has_symlink_attr */
864
865
866
PHYSFS_sint64 zip_dos_time_to_physfs_time(PHYSFS_uint32 dostime)
867
{
868
PHYSFS_uint32 dosdate;
869
870
struct tm unixtime;
memset(&unixtime, '\0', sizeof (unixtime));
871
872
873
dosdate = (PHYSFS_uint32) ((dostime >> 16) & 0xFFFF);
dostime &= 0xFFFF;
874
875
876
877
878
879
880
881
882
883
884
885
886
/* 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;
887
888
return((PHYSFS_sint64) mktime(&unixtime));
889
} /* zip_dos_time_to_physfs_time */
890
891
892
static int zip_load_entry(void *in, ZIPentry *entry, PHYSFS_uint32 ofs_fixup)
893
894
895
896
897
898
899
900
901
902
903
904
905
906
{
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);
907
BAIL_IF_MACRO(!readui16(in, &ui16), NULL, 0); /* general bits */
908
909
BAIL_IF_MACRO(!readui16(in, &entry->compression_method), NULL, 0);
BAIL_IF_MACRO(!readui32(in, &ui32), NULL, 0);
910
entry->last_mod_time = zip_dos_time_to_physfs_time(ui32);
911
912
913
914
915
916
917
918
919
920
921
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;
922
923
924
925
entry->symlink = NULL; /* will be resolved later, if necessary. */
entry->resolved = (zip_has_symlink_attr(entry, external_attr)) ?
ZIP_UNRESOLVED_SYMLINK : ZIP_UNRESOLVED_FILE;
926
927
928
929
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)
930
goto zip_load_entry_puked;
931
932
entry->name[fnamelen] = '\0'; /* null-terminate the filename. */
933
zip_convert_dos_path(entry, entry->name);
934
935
936
si64 = __PHYSFS_platformTell(in);
if (si64 == -1)
937
goto zip_load_entry_puked;
938
939
940
/* seek to the start of the next entry in the central directory... */
if (!__PHYSFS_platformSeek(in, si64 + extralen + commentlen))
941
goto zip_load_entry_puked;
942
943
return(1); /* success. */
944
945
zip_load_entry_puked:
946
947
free(entry->name);
return(0); /* failure. */
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
} /* zip_load_entry */
static void zip_entry_swap(ZIPentry *a, PHYSFS_uint32 one, PHYSFS_uint32 two)
{
ZIPentry tmp;
memcpy(&tmp, &a[one], sizeof (ZIPentry));
memcpy(&a[one], &a[two], sizeof (ZIPentry));
memcpy(&a[two], &tmp, sizeof (ZIPentry));
} /* zip_entry_swap */
static void zip_quick_sort(ZIPentry *a, PHYSFS_uint32 lo, PHYSFS_uint32 hi)
{
PHYSFS_uint32 i;
PHYSFS_uint32 j;
ZIPentry *v;
if ((hi - lo) > ZIP_QUICKSORT_THRESHOLD)
{
i = (hi + lo) / 2;
if (strcmp(a[lo].name, a[i].name) > 0) zip_entry_swap(a, lo, i);
if (strcmp(a[lo].name, a[hi].name) > 0) zip_entry_swap(a, lo, hi);
if (strcmp(a[i].name, a[hi].name) > 0) zip_entry_swap(a, i, hi);
j = hi - 1;
zip_entry_swap(a, i, j);
i = lo;
v = &a[j];
while (1)
{
while(strcmp(a[++i].name, v->name) < 0) {}
while(strcmp(a[--j].name, v->name) > 0) {}
if (j < i)
break;
zip_entry_swap(a, i, j);
} /* while */
zip_entry_swap(a, i, hi-1);
zip_quick_sort(a, lo, j);
zip_quick_sort(a, i+1, hi);
} /* if */
} /* zip_quick_sort */
static void zip_insertion_sort(ZIPentry *a, PHYSFS_uint32 lo, PHYSFS_uint32 hi)
{
PHYSFS_uint32 i;
PHYSFS_uint32 j;
ZIPentry tmp;
for (i = lo + 1; i <= hi; i++)
{