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archiver_qpak.c
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archiver_qpak.c
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/*
* QPAK support routines for PhysicsFS.
*
* This archiver handles the archive format utilized by Quake 1 and 2.
* Quake3-based games use the PkZip/Info-Zip format (which our zip.c
* archiver handles).
*
* ========================================================================
*
* This format info (in more detail) comes from:
* http://debian.fmi.uni-sofia.bg/~sergei/cgsr/docs/pak.txt
*
* Quake PAK Format
*
* Header
* (4 bytes) signature = 'PACK'
* (4 bytes) directory offset
* (4 bytes) directory length
*
* Directory
* (56 bytes) file name
* (4 bytes) file position
* (4 bytes) file length
*
* ========================================================================
*
* Please see the file LICENSE.txt in the source's root directory.
*
* This file written by Ryan C. Gordon.
*/
#define __PHYSICSFS_INTERNAL__
#include "physfs_internal.h"
#if PHYSFS_SUPPORTS_QPAK
#define QPAK_SIG 0x4B434150 /* "PACK" in ASCII. */
static UNPKentry *qpakLoadEntries(PHYSFS_Io *io, PHYSFS_uint32 fileCount)
{
UNPKentry *entries = NULL;
UNPKentry *entry = NULL;
entries = (UNPKentry *) allocator.Malloc(sizeof (UNPKentry) * fileCount);
BAIL_IF_MACRO(entries == NULL, PHYSFS_ERR_OUT_OF_MEMORY, NULL);
for (entry = entries; fileCount > 0; fileCount--, entry++)
{
if (!__PHYSFS_readAll(io, &entry->name, 56)) goto failed;
if (!__PHYSFS_readAll(io, &entry->startPos, 4)) goto failed;
if (!__PHYSFS_readAll(io, &entry->size, 4)) goto failed;
entry->size = PHYSFS_swapULE32(entry->size);
entry->startPos = PHYSFS_swapULE32(entry->startPos);
} /* for */
return entries;
failed:
allocator.Free(entries);
return NULL;
} /* qpakLoadEntries */
static void *QPAK_openArchive(PHYSFS_Io *io, const char *name, int forWriting)
{
UNPKentry *entries = NULL;
PHYSFS_uint32 val = 0;
PHYSFS_uint32 pos = 0;
PHYSFS_uint32 count = 0;
assert(io != NULL); /* shouldn't ever happen. */
BAIL_IF_MACRO(forWriting, PHYSFS_ERR_READ_ONLY, NULL);
BAIL_IF_MACRO(!__PHYSFS_readAll(io, &val, 4), ERRPASS, NULL);
if (PHYSFS_swapULE32(val) != QPAK_SIG)
BAIL_MACRO(PHYSFS_ERR_UNSUPPORTED, NULL);
BAIL_IF_MACRO(!__PHYSFS_readAll(io, &val, 4), ERRPASS, NULL);
pos = PHYSFS_swapULE32(val); /* directory table offset. */
BAIL_IF_MACRO(!__PHYSFS_readAll(io, &val, 4), ERRPASS, NULL);
count = PHYSFS_swapULE32(val);
/* corrupted archive? */
BAIL_IF_MACRO((count % 64) != 0, PHYSFS_ERR_CORRUPT, NULL);
count /= 64;
BAIL_IF_MACRO(!io->seek(io, pos), ERRPASS, NULL);
entries = qpakLoadEntries(io, count);
BAIL_IF_MACRO(!entries, ERRPASS, NULL);
return UNPK_openArchive(io, entries, count);
} /* QPAK_openArchive */
const PHYSFS_Archiver __PHYSFS_Archiver_QPAK =
{
CURRENT_PHYSFS_ARCHIVER_API_VERSION,
{
"PAK",
"Quake I/II format",
"Ryan C. Gordon <icculus@icculus.org>",
"http://icculus.org/physfs/",
},
0, /* supportsSymlinks */
QPAK_openArchive, /* openArchive() method */
UNPK_enumerateFiles, /* enumerateFiles() method */
UNPK_openRead, /* openRead() method */
UNPK_openWrite, /* openWrite() method */
UNPK_openAppend, /* openAppend() method */
UNPK_remove, /* remove() method */
UNPK_mkdir, /* mkdir() method */
UNPK_closeArchive, /* closeArchive() method */
UNPK_stat /* stat() method */
};
#endif /* defined PHYSFS_SUPPORTS_QPAK */
/* end of archiver_qpak.c ... */