/* * WAD support routines for PhysicsFS. * * This driver handles DOOM engine archives ("wads"). * This format (but not this driver) was designed by id Software for use * with the DOOM engine. * The specs of the format are from the unofficial doom specs v1.666 * found here: http://www.gamers.org/dhs/helpdocs/dmsp1666.html * The format of the archive: (from the specs) * * A WAD file has three parts: * (1) a twelve-byte header * (2) one or more "lumps" * (3) a directory or "info table" that contains the names, offsets, and * sizes of all the lumps in the WAD * * The header consists of three four-byte parts: * (a) an ASCII string which must be either "IWAD" or "PWAD" * (b) a 4-byte (long) integer which is the number of lumps in the wad * (c) a long integer which is the file offset to the start of * the directory * * The directory has one 16-byte entry for every lump. Each entry consists * of three parts: * * (a) a long integer, the file offset to the start of the lump * (b) a long integer, the size of the lump in bytes * (c) an 8-byte ASCII string, the name of the lump, padded with zeros. * For example, the "DEMO1" entry in hexadecimal would be * (44 45 4D 4F 31 00 00 00) * * Note that there is no way to tell if an opened WAD archive is a * IWAD or PWAD with this archiver. * I couldn't think of a way to provide that information, without being too * hacky. * I don't think it's really that important though. * * * Please see the file LICENSE.txt in the source's root directory. * * This file written by Travis Wells, based on the GRP archiver by * Ryan C. Gordon. */#define __PHYSICSFS_INTERNAL__#include "physfs_internal.h"#if PHYSFS_SUPPORTS_WADstatic UNPKentry *wadLoadEntries(PHYSFS_Io *io, PHYSFS_uint32 fileCount){ PHYSFS_uint32 directoryOffset; UNPKentry *entries = NULL; UNPKentry *entry = NULL; BAIL_IF_MACRO(!__PHYSFS_readAll(io, &directoryOffset, 4), ERRPASS, 0); directoryOffset = PHYSFS_swapULE32(directoryOffset); BAIL_IF_MACRO(!io->seek(io, directoryOffset), ERRPASS, 0); entries = (UNPKentry *) allocator.Malloc(sizeof (UNPKentry) * fileCount); BAIL_IF_MACRO(!entries, PHYSFS_ERR_OUT_OF_MEMORY, NULL); for (entry = entries; fileCount > 0; fileCount--, entry++) { if (!__PHYSFS_readAll(io, &entry->startPos, 4)) goto failed; if (!__PHYSFS_readAll(io, &entry->size, 4)) goto failed; if (!__PHYSFS_readAll(io, &entry->name, 8)) goto failed; entry->name[8] = '\0'; /* name might not be null-terminated in file. */ entry->size = PHYSFS_swapULE32(entry->size); entry->startPos = PHYSFS_swapULE32(entry->startPos); } /* for */ return entries;failed: allocator.Free(entries); return NULL;} /* wadLoadEntries */static void *WAD_openArchive(PHYSFS_Io *io, const char *name, int forWriting){ PHYSFS_uint8 buf[4]; UNPKentry *entries = NULL; 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, buf, sizeof (buf)), ERRPASS, NULL); if ((memcmp(buf, "IWAD", 4) != 0) && (memcmp(buf, "PWAD", 4) != 0)) BAIL_MACRO(PHYSFS_ERR_UNSUPPORTED, NULL); BAIL_IF_MACRO(!__PHYSFS_readAll(io, &count, sizeof (count)), ERRPASS, NULL); count = PHYSFS_swapULE32(count); entries = wadLoadEntries(io, count); BAIL_IF_MACRO(!entries, ERRPASS, NULL); return UNPK_openArchive(io, entries, count);} /* WAD_openArchive */const PHYSFS_Archiver __PHYSFS_Archiver_WAD ={ { "WAD", "DOOM engine format", "Travis Wells <traviswells@mchsi.com>", "http://www.3dmm2.com/doom/", }, WAD_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_WAD *//* end of wad.c ... */