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      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< (unsigned) 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 }
    159