136 lines
3.9 KiB
C
136 lines
3.9 KiB
C
/*
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* WAD support routines for PhysicsFS.
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*
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* This driver handles DOOM engine archives ("wads").
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* This format (but not this driver) was designed by id Software for use
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* with the DOOM engine.
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* The specs of the format are from the unofficial doom specs v1.666
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* found here: http://www.gamers.org/dhs/helpdocs/dmsp1666.html
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* The format of the archive: (from the specs)
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*
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* A WAD file has three parts:
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* (1) a twelve-byte header
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* (2) one or more "lumps"
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* (3) a directory or "info table" that contains the names, offsets, and
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* sizes of all the lumps in the WAD
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*
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* The header consists of three four-byte parts:
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* (a) an ASCII string which must be either "IWAD" or "PWAD"
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* (b) a uint32 which is the number of lumps in the wad
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* (c) a uint32 which is the file offset to the start of
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* the directory
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*
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* The directory has one 16-byte entry for every lump. Each entry consists
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* of three parts:
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*
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* (a) a uint32, the file offset to the start of the lump
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* (b) a uint32, the size of the lump in bytes
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* (c) an 8-byte ASCII string, the name of the lump, padded with zeros.
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* For example, the "DEMO1" entry in hexadecimal would be
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* (44 45 4D 4F 31 00 00 00)
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*
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* Note that there is no way to tell if an opened WAD archive is a
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* IWAD or PWAD with this archiver.
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* I couldn't think of a way to provide that information, without being too
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* hacky.
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* I don't think it's really that important though.
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*
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*
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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 Travis Wells, based on the GRP archiver by
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* Ryan C. Gordon.
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*/
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#define __PHYSICSFS_INTERNAL__
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#include "physfs_internal.h"
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#if PHYSFS_SUPPORTS_WAD
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static int wadLoadEntries(PHYSFS_Io *io, const PHYSFS_uint32 count, void *arc)
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{
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PHYSFS_uint32 i;
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for (i = 0; i < count; i++)
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{
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PHYSFS_uint32 pos;
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PHYSFS_uint32 size;
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char name[9];
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &pos, 4), 0);
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &size, 4), 0);
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, name, 8), 0);
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name[8] = '\0'; /* name might not be null-terminated in file. */
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size = PHYSFS_swapULE32(size);
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pos = PHYSFS_swapULE32(pos);
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BAIL_IF_ERRPASS(!UNPK_addEntry(arc, name, 0, -1, -1, pos, size), 0);
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} /* for */
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return 1;
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} /* wadLoadEntries */
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static void *WAD_openArchive(PHYSFS_Io *io, const char *name,
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int forWriting, int *claimed)
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{
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PHYSFS_uint8 buf[4];
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PHYSFS_uint32 count;
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PHYSFS_uint32 directoryOffset;
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void *unpkarc;
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assert(io != NULL); /* shouldn't ever happen. */
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BAIL_IF(forWriting, PHYSFS_ERR_READ_ONLY, NULL);
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, buf, sizeof (buf)), NULL);
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if ((memcmp(buf, "IWAD", 4) != 0) && (memcmp(buf, "PWAD", 4) != 0))
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BAIL(PHYSFS_ERR_UNSUPPORTED, NULL);
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*claimed = 1;
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &count, sizeof (count)), NULL);
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count = PHYSFS_swapULE32(count);
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &directoryOffset, 4), 0);
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directoryOffset = PHYSFS_swapULE32(directoryOffset);
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BAIL_IF_ERRPASS(!io->seek(io, directoryOffset), 0);
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unpkarc = UNPK_openArchive(io, 0, 1);
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BAIL_IF_ERRPASS(!unpkarc, NULL);
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if (!wadLoadEntries(io, count, unpkarc))
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{
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UNPK_abandonArchive(unpkarc);
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return NULL;
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} /* if */
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return unpkarc;
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} /* WAD_openArchive */
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const PHYSFS_Archiver __PHYSFS_Archiver_WAD =
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{
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CURRENT_PHYSFS_ARCHIVER_API_VERSION,
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{
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"WAD",
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"DOOM engine format",
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"Travis Wells <traviswells@mchsi.com>",
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"http://www.3dmm2.com/doom/",
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0, /* supportsSymlinks */
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},
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WAD_openArchive,
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UNPK_enumerate,
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UNPK_openRead,
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UNPK_openWrite,
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UNPK_openAppend,
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UNPK_remove,
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UNPK_mkdir,
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UNPK_stat,
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UNPK_closeArchive
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};
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#endif /* defined PHYSFS_SUPPORTS_WAD */
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/* end of physfs_archiver_wad.c ... */
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