Games/Quake/wad.c

   1 /*
   2 Copyright (C) 1996-1997 Id Software, Inc.
   3
   4 This program is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU General Public License
   6 as published by the Free Software Foundation; either version 2
   7 of the License, or (at your option) any later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  12
  13 See the GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  18
  19 */
  20 // wad.c
  21
  22 #include "quakedef.h"
  23
  24 int                     wad_numlumps;
  25 lumpinfo_t      *wad_lumps;
  26 byte            *wad_base;
  27
  28 void SwapPic (qpic_t *pic);
  29
  30 /*
  31 ==================
  32 W_CleanupName
  33
  34 Lowercases name and pads with spaces and a terminating 0 to the length of
  35 lumpinfo_t->name.
  36 Used so lumpname lookups can proceed rapidly by comparing 4 chars at a time
  37 Space padding is so names can be printed nicely in tables.
  38 Can safely be performed in place.
  39 ==================
  40 */
  41 void W_CleanupName (char *in, char *out)
  42 {
  43         int             i;
  44         int             c;
  45
  46         for (i=0 ; i<16 ; i++ )
  47         {
  48                 c = in[i];
  49                 if (!c)
  50                         break;
  51
  52                 if (c >= 'A' && c <= 'Z')
  53                         c += ('a' - 'A');
  54                 out[i] = c;
  55         }
  56
  57         for ( ; i< 16 ; i++ )
  58                 out[i] = 0;
  59 }
  60
  61
  62
  63 /*
  64 ====================
  65 W_LoadWadFile
  66 ====================
  67 */
  68 void W_LoadWadFile (char *filename)
  69 {
  70         lumpinfo_t              *lump_p;
  71         wadinfo_t               *header;
  72         unsigned                i;
  73         int                             infotableofs;
  74
  75         wad_base = COM_LoadHunkFile (filename);
  76         if (!wad_base)
  77                 Sys_Error ("W_LoadWadFile: couldn't load %s", filename);
  78
  79         header = (wadinfo_t *)wad_base;
  80
  81         if (header->identification[0] != 'W'
  82         || header->identification[1] != 'A'
  83         || header->identification[2] != 'D'
  84         || header->identification[3] != '2')
  85                 Sys_Error ("Wad file %s doesn't have WAD2 id\n",filename);
  86
  87         wad_numlumps = LittleLong(header->numlumps);
  88         infotableofs = LittleLong(header->infotableofs);
  89         wad_lumps = (lumpinfo_t *)(wad_base + infotableofs);
  90
  91         for (i=0, lump_p = wad_lumps ; i<wad_numlumps ; i++,lump_p++)
  92         {
  93                 lump_p->filepos = LittleLong(lump_p->filepos);
  94                 lump_p->size = LittleLong(lump_p->size);
  95                 W_CleanupName (lump_p->name, lump_p->name);
  96                 if (lump_p->type == TYP_QPIC)
  97                         SwapPic ( (qpic_t *)(wad_base + lump_p->filepos));
  98         }
  99 }
 100
 101
 102 /*
 103 =============
 104 W_GetLumpinfo
 105 =============
 106 */
 107 lumpinfo_t      *W_GetLumpinfo (char *name)
 108 {
 109         int             i;
 110         lumpinfo_t      *lump_p;
 111         char    clean[16];
 112
 113         W_CleanupName (name, clean);
 114
 115         for (lump_p=wad_lumps, i=0 ; i<wad_numlumps ; i++,lump_p++)
 116         {
 117                 if (!strcmp(clean, lump_p->name))
 118                         return lump_p;
 119         }
 120
 121         Sys_Error ("W_GetLumpinfo: %s not found", name);
 122         return NULL;
 123 }
 124
 125 void *W_GetLumpName (char *name)
 126 {
 127         lumpinfo_t      *lump;
 128
 129         lump = W_GetLumpinfo (name);
 130
 131         return (void *)(wad_base + lump->filepos);
 132 }
 133
 134 void *W_GetLumpNum (int num)
 135 {
 136         lumpinfo_t      *lump;
 137
 138         if (num < 0 || num > wad_numlumps)
 139                 Sys_Error ("W_GetLumpNum: bad number: %i", num);
 140
 141         lump = wad_lumps + num;
 142
 143         return (void *)(wad_base + lump->filepos);
 144 }
 145
 146 /*
 147 =============================================================================
 148
 149 automatic byte swapping
 150
 151 =============================================================================
 152 */
 153
 154 void SwapPic (qpic_t *pic)
 155 {
 156         pic->width = LittleLong(pic->width);
 157         pic->height = LittleLong(pic->height);
 158 }