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  1. /*
  2.  * QPAK support routines for PhysicsFS.
  3.  *
  4.  *  This archiver handles the archive format utilized by Quake 1 and 2.
  5.  *  Quake3-based games use the PkZip/Info-Zip format (which our
  6.  *  physfs_archiver_zip.c handles).
  7.  *
  8.  *  ========================================================================
  9.  *
  10.  *  This format info (in more detail) comes from:
  11.  *     https://web.archive.org/web/20040209101748/http://debian.fmi.uni-sofia.bg/~sergei/cgsr/docs/pak.txt
  12.  *
  13.  *  Quake PAK Format
  14.  *
  15.  *  Header
  16.  *   (4 bytes)  signature = 'PACK'
  17.  *   (4 bytes)  directory offset
  18.  *   (4 bytes)  directory length
  19.  *
  20.  *  Directory
  21.  *   (56 bytes) file name
  22.  *   (4 bytes)  file position
  23.  *   (4 bytes)  file length
  24.  *
  25.  *  ========================================================================
  26.  *
  27.  * Please see the file LICENSE.txt in the source's root directory.
  28.  *
  29.  *  This file written by Ryan C. Gordon.
  30.  */
  31.  
  32. #define __PHYSICSFS_INTERNAL__
  33. #include "physfs_internal.h"
  34.  
  35. #if PHYSFS_SUPPORTS_QPAK
  36.  
  37. #define QPAK_SIG 0x4B434150   /* "PACK" in ASCII. */
  38.  
  39. static int qpakLoadEntries(PHYSFS_Io *io, const PHYSFS_uint32 count, void *arc)
  40. {
  41.     PHYSFS_uint32 i;
  42.     for (i = 0; i < count; i++)
  43.     {
  44.         PHYSFS_uint32 size;
  45.         PHYSFS_uint32 pos;
  46.         char name[56];
  47.         BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, name, 56), 0);
  48.         BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &pos, 4), 0);
  49.         BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &size, 4), 0);
  50.         size = PHYSFS_swapULE32(size);
  51.         pos = PHYSFS_swapULE32(pos);
  52.         BAIL_IF_ERRPASS(!UNPK_addEntry(arc, name, 0, -1, -1, pos, size), 0);
  53.     } /* for */
  54.  
  55.     return 1;
  56. } /* qpakLoadEntries */
  57.  
  58.  
  59. static void *QPAK_openArchive(PHYSFS_Io *io, const char *name,
  60.                               int forWriting, int *claimed)
  61. {
  62.     PHYSFS_uint32 val = 0;
  63.     PHYSFS_uint32 pos = 0;
  64.     PHYSFS_uint32 count = 0;
  65.     void *unpkarc;
  66.  
  67.     assert(io != NULL);  /* shouldn't ever happen. */
  68.  
  69.     BAIL_IF(forWriting, PHYSFS_ERR_READ_ONLY, NULL);
  70.  
  71.     BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &val, 4), NULL);
  72.     if (PHYSFS_swapULE32(val) != QPAK_SIG)
  73.         BAIL(PHYSFS_ERR_UNSUPPORTED, NULL);
  74.  
  75.     *claimed = 1;
  76.  
  77.     BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &val, 4), NULL);
  78.     pos = PHYSFS_swapULE32(val);  /* directory table offset. */
  79.  
  80.     BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &val, 4), NULL);
  81.     count = PHYSFS_swapULE32(val);
  82.  
  83.     /* corrupted archive? */
  84.     BAIL_IF((count % 64) != 0, PHYSFS_ERR_CORRUPT, NULL);
  85.     count /= 64;
  86.  
  87.     BAIL_IF_ERRPASS(!io->seek(io, pos), NULL);
  88.  
  89.     unpkarc = UNPK_openArchive(io);
  90.     BAIL_IF_ERRPASS(!unpkarc, NULL);
  91.  
  92.     if (!qpakLoadEntries(io, count, unpkarc))
  93.     {
  94.         UNPK_abandonArchive(unpkarc);
  95.         return NULL;
  96.     } /* if */
  97.  
  98.     return unpkarc;
  99. } /* QPAK_openArchive */
  100.  
  101.  
  102. const PHYSFS_Archiver __PHYSFS_Archiver_QPAK =
  103. {
  104.     CURRENT_PHYSFS_ARCHIVER_API_VERSION,
  105.     {
  106.         "PAK",
  107.         "Quake I/II format",
  108.         "Ryan C. Gordon <icculus@icculus.org>",
  109.         "https://icculus.org/physfs/",
  110.         0,  /* supportsSymlinks */
  111.     },
  112.     QPAK_openArchive,
  113.     UNPK_enumerate,
  114.     UNPK_openRead,
  115.     UNPK_openWrite,
  116.     UNPK_openAppend,
  117.     UNPK_remove,
  118.     UNPK_mkdir,
  119.     UNPK_stat,
  120.     UNPK_closeArchive
  121. };
  122.  
  123. #endif  /* defined PHYSFS_SUPPORTS_QPAK */
  124.  
  125. /* end of physfs_archiver_qpak.c ... */
  126.  
  127.