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
*
* ========================================================================
*
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* Please see the file LICENSE.txt in the source's root directory.
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*
* This file written by Ryan C. Gordon.
*/
#define __PHYSICSFS_INTERNAL__
#include "physfs_internal.h"
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#if PHYSFS_SUPPORTS_QPAK
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#define QPAK_SIG 0x4B434150 /* "PACK" in ASCII. */
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static UNPKentry *qpakLoadEntries(PHYSFS_Io *io, PHYSFS_uint32 fileCount)
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UNPKentry *entries = NULL;
UNPKentry *entry = NULL;
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entries = (UNPKentry *) allocator.Malloc(sizeof (UNPKentry) * fileCount);
BAIL_IF_MACRO(entries == NULL, PHYSFS_ERR_OUT_OF_MEMORY, NULL);
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for (entry = entries; fileCount > 0; fileCount--, entry++)
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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;
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entry->size = PHYSFS_swapULE32(entry->size);
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entry->startPos = PHYSFS_swapULE32(entry->startPos);
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} /* for */
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return entries;
failed:
allocator.Free(entries);
return NULL;
} /* qpakLoadEntries */
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static void *QPAK_openArchive(PHYSFS_Io *io, const char *name, int forWriting)
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UNPKentry *entries = NULL;
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PHYSFS_uint32 val = 0;
PHYSFS_uint32 pos = 0;
PHYSFS_uint32 count = 0;
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assert(io != NULL); /* shouldn't ever happen. */
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BAIL_IF_MACRO(forWriting, PHYSFS_ERR_READ_ONLY, NULL);
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BAIL_IF_MACRO(!__PHYSFS_readAll(io, &val, 4), ERRPASS, NULL);
if (PHYSFS_swapULE32(val) != QPAK_SIG)
BAIL_MACRO(PHYSFS_ERR_UNSUPPORTED, NULL);
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BAIL_IF_MACRO(!__PHYSFS_readAll(io, &val, 4), ERRPASS, NULL);
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pos = PHYSFS_swapULE32(val); /* directory table offset. */
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BAIL_IF_MACRO(!__PHYSFS_readAll(io, &val, 4), ERRPASS, NULL);
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count = PHYSFS_swapULE32(val);
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/* corrupted archive? */
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BAIL_IF_MACRO((count % 64) != 0, PHYSFS_ERR_CORRUPT, NULL);
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count /= 64;
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BAIL_IF_MACRO(!io->seek(io, pos), ERRPASS, NULL);
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entries = qpakLoadEntries(io, count);
BAIL_IF_MACRO(!entries, ERRPASS, NULL);
return UNPK_openArchive(io, entries, count);
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} /* QPAK_openArchive */
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const PHYSFS_Archiver __PHYSFS_Archiver_QPAK =
{
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CURRENT_PHYSFS_ARCHIVER_API_VERSION,
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{
"PAK",
"Quake I/II format",
"Ryan C. Gordon <icculus@icculus.org>",
"http://icculus.org/physfs/",
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0, /* supportsSymlinks */
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QPAK_openArchive,
UNPK_enumerateFiles,
UNPK_openRead,
UNPK_openWrite,
UNPK_openAppend,
UNPK_remove,
UNPK_mkdir,
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UNPK_stat,
UNPK_closeArchive
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#endif /* defined PHYSFS_SUPPORTS_QPAK */
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/* end of archiver_qpak.c ... */