src/archiver_wad.c
author Ryan C. Gordon <icculus@icculus.org>
Mon, 06 Sep 2010 19:35:01 -0400
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child 1203 55f147714ce2
permissions -rw-r--r--
Cleaned up some #includes.
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/*
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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 4-byte (long) integer which is the number of lumps in the wad
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 *    (c) a long integer 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 long integer, the file offset to the start of the lump
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 *    (b) a long integer, 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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#if (defined PHYSFS_SUPPORTS_WAD)
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#define __PHYSICSFS_INTERNAL__
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#include "physfs_internal.h"
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static inline int readAll(PHYSFS_Io *io, void *buf, const PHYSFS_uint64 len)
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{
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    return (io->read(io, buf, len) == len);
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} /* readAll */
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static UNPKentry *wadLoadEntries(PHYSFS_Io *io, PHYSFS_uint32 fileCount)
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{
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    PHYSFS_uint32 directoryOffset;
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    UNPKentry *entries = NULL;
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    UNPKentry *entry = NULL;
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    BAIL_IF_MACRO(!readAll(io, &directoryOffset, 4), NULL, 0);
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    directoryOffset = PHYSFS_swapULE32(directoryOffset);
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    BAIL_IF_MACRO(!io->seek(io, directoryOffset), NULL, 0);
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    entries = (UNPKentry *) allocator.Malloc(sizeof (UNPKentry) * fileCount);
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    BAIL_IF_MACRO(entries == NULL, ERR_OUT_OF_MEMORY, NULL);
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    for (entry = entries; fileCount > 0; fileCount--, entry++)
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    {
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        GOTO_IF_MACRO(!readAll(io, &entry->startPos, 4), NULL, wadLoad_failed);
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        GOTO_IF_MACRO(!readAll(io, &entry->size, 4), NULL, wadLoad_failed);
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        GOTO_IF_MACRO(!readAll(io, &entry->name, 8), NULL, wadLoad_failed);
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        entry->name[8] = '\0'; /* name might not be null-terminated in file. */
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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;
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wadLoad_failed:
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    allocator.Free(entries);
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    return NULL;
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} /* wadLoadEntries */
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static void *WAD_openArchive(PHYSFS_Io *io, const char *name, int forWriting)
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{
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    PHYSFS_uint8 buf[4];
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    UNPKentry *entries = NULL;
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    PHYSFS_uint32 entryCount = 0;
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    assert(io != NULL);  /* shouldn't ever happen. */
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    BAIL_IF_MACRO(forWriting, ERR_ARC_IS_READ_ONLY, 0);
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    BAIL_IF_MACRO(!readAll(io, buf, sizeof (buf)), NULL, NULL);
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    if ((memcmp(buf, "IWAD", 4) != 0) && (memcmp(buf, "PWAD", 4) != 0))
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        BAIL_MACRO(ERR_NOT_AN_ARCHIVE, NULL);
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    BAIL_IF_MACRO(!readAll(io, &entryCount, sizeof (entryCount)), NULL, NULL);
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    entryCount = PHYSFS_swapULE32(entryCount);
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    entries = wadLoadEntries(io, entryCount);
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    BAIL_IF_MACRO(entries == NULL, NULL, NULL);
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    return UNPK_openArchive(io, entries, entryCount);
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} /* WAD_openArchive */
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const PHYSFS_ArchiveInfo __PHYSFS_ArchiveInfo_WAD =
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{
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    "WAD",
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    WAD_ARCHIVE_DESCRIPTION,
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    "Travis Wells <traviswells@mchsi.com>",
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    "http://www.3dmm2.com/doom/",
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};
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const PHYSFS_Archiver __PHYSFS_Archiver_WAD =
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{
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    &__PHYSFS_ArchiveInfo_WAD,
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    WAD_openArchive,        /* openArchive() method    */
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    UNPK_enumerateFiles,     /* enumerateFiles() method */
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    UNPK_openRead,           /* openRead() method       */
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    UNPK_openWrite,          /* openWrite() method      */
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    UNPK_openAppend,         /* openAppend() method     */
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    UNPK_remove,             /* remove() method         */
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    UNPK_mkdir,              /* mkdir() method          */
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    UNPK_dirClose,           /* dirClose() method       */
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    UNPK_stat                /* stat() method           */
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};
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#endif  /* defined PHYSFS_SUPPORTS_WAD */
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/* end of wad.c ... */
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