very minor cleaning
[divverent/darkplaces.git] / 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
21
22 #include "quakedef.h"
23 #include "image.h"
24 #include "wad.h"
25
26
27 /*
28 ==================
29 W_CleanupName
30
31 Lowercases name and pads with spaces and a terminating 0 to the length of
32 lumpinfo_t->name.
33 Used so lumpname lookups can proceed rapidly by comparing 4 chars at a time
34 Space padding is so names can be printed nicely in tables.
35 Can safely be performed in place.
36 ==================
37 */
38 static void W_CleanupName (const char *in, char *out)
39 {
40         int             i;
41         int             c;
42
43         for (i=0 ; i<16 ; i++ )
44         {
45                 c = in[i];
46                 if (!c)
47                         break;
48
49                 if (c >= 'A' && c <= 'Z')
50                         c += ('a' - 'A');
51                 out[i] = c;
52         }
53
54         for ( ; i< 16 ; i++ )
55                 out[i] = 0;
56 }
57
58 static int wad_numlumps = 0;
59 static lumpinfo_t *wad_lumps = NULL;
60 static unsigned char *wad_base = NULL;
61
62 unsigned char *W_GetLumpName(const char *name)
63 {
64         int i;
65         fs_offset_t filesize;
66         lumpinfo_t *lump;
67         char clean[16];
68         wadinfo_t *header;
69         int infotableofs;
70
71         W_CleanupName (name, clean);
72
73         if (!wad_base)
74         {
75                 if ((wad_base = FS_LoadFile ("gfx.wad", cls.permanentmempool, false, &filesize)))
76                 {
77                         if (memcmp(wad_base, "WAD2", 4))
78                         {
79                                 Con_Print("gfx.wad doesn't have WAD2 id\n");
80                                 Mem_Free(wad_base);
81                                 wad_base = NULL;
82                         }
83                         else
84                         {
85                                 header = (wadinfo_t *)wad_base;
86                                 wad_numlumps = LittleLong(header->numlumps);
87                                 infotableofs = LittleLong(header->infotableofs);
88                                 wad_lumps = (lumpinfo_t *)(wad_base + infotableofs);
89
90                                 for (i=0, lump = wad_lumps ; i<wad_numlumps ; i++,lump++)
91                                 {
92                                         lump->filepos = LittleLong(lump->filepos);
93                                         lump->size = LittleLong(lump->size);
94                                         W_CleanupName (lump->name, lump->name);
95                                 }
96                         }
97                 }
98         }
99
100         for (lump = wad_lumps, i = 0;i < wad_numlumps;i++, lump++)
101                 if (!strcmp(clean, lump->name))
102                         return (wad_base + lump->filepos);
103
104         if (wad_base)
105                 Con_DPrintf("W_GetLumpByName(\"%s\"): couldn't find file in gfx.wad\n", name);
106         else
107                 Con_DPrintf("W_GetLumpByName(\"%s\"): couldn't load gfx.wad\n", name);
108         return NULL;
109 }
110
111 /*
112 =============================================================================
113
114 automatic byte swapping
115
116 =============================================================================
117 */
118
119 // LordHavoc: added alternate WAD2/WAD3 system for HalfLife texture wads
120 #define TEXWAD_MAXIMAGES 16384
121 typedef struct texwadlump_s
122 {
123         char name[16];
124         qfile_t *file;
125         int position;
126         int size;
127 } texwadlump_t;
128
129 static texwadlump_t texwadlump[TEXWAD_MAXIMAGES];
130
131 /*
132 ====================
133 W_LoadTextureWadFile
134 ====================
135 */
136 void W_LoadTextureWadFile (char *filename, int complain)
137 {
138         lumpinfo_t              *lumps, *lump_p;
139         wadinfo_t               header;
140         int                             i, j;
141         int                             infotableofs;
142         qfile_t                 *file;
143         int                             numlumps;
144
145         file = FS_Open (filename, "rb", false, false);
146         if (!file)
147         {
148                 if (complain)
149                         Con_Printf("W_LoadTextureWadFile: couldn't find %s\n", filename);
150                 return;
151         }
152
153         if (FS_Read(file, &header, sizeof(wadinfo_t)) != sizeof(wadinfo_t))
154         {Con_Print("W_LoadTextureWadFile: unable to read wad header\n");return;}
155
156         if(memcmp(header.identification, "WAD3", 4))
157         {Con_Printf("W_LoadTextureWadFile: Wad file %s doesn't have WAD3 id\n",filename);return;}
158
159         numlumps = LittleLong(header.numlumps);
160         if (numlumps < 1 || numlumps > TEXWAD_MAXIMAGES)
161         {Con_Printf("W_LoadTextureWadFile: invalid number of lumps (%i)\n", numlumps);return;}
162         infotableofs = LittleLong(header.infotableofs);
163         if (FS_Seek (file, infotableofs, SEEK_SET))
164         {Con_Print("W_LoadTextureWadFile: unable to seek to lump table\n");return;}
165         if (!(lumps = (lumpinfo_t *)Mem_Alloc(tempmempool, sizeof(lumpinfo_t)*numlumps)))
166         {Con_Print("W_LoadTextureWadFile: unable to allocate temporary memory for lump table\n");return;}
167
168         if (FS_Read(file, lumps, sizeof(lumpinfo_t) * numlumps) != (fs_offset_t)sizeof(lumpinfo_t) * numlumps)
169         {Con_Print("W_LoadTextureWadFile: unable to read lump table\n");return;}
170
171         for (i=0, lump_p = lumps ; i<numlumps ; i++,lump_p++)
172         {
173                 W_CleanupName (lump_p->name, lump_p->name);
174                 for (j = 0;j < TEXWAD_MAXIMAGES;j++)
175                 {
176                         if (texwadlump[j].name[0]) // occupied slot, check the name
177                         {
178                                 if (!strcmp(lump_p->name, texwadlump[j].name)) // name match, replace old one
179                                         break;
180                         }
181                         else // empty slot
182                                 break;
183                 }
184                 if (j >= TEXWAD_MAXIMAGES)
185                         break; // abort loading
186                 W_CleanupName (lump_p->name, texwadlump[j].name);
187                 texwadlump[j].file = file;
188                 texwadlump[j].position = LittleLong(lump_p->filepos);
189                 texwadlump[j].size = LittleLong(lump_p->disksize);
190         }
191         Mem_Free(lumps);
192         // leaves the file open
193 }
194
195
196 unsigned char *W_ConvertWAD3Texture(miptex_t *tex)
197 {
198         unsigned char *in, *data, *out, *pal;
199         int d, p;
200
201         in = (unsigned char *)tex + tex->offsets[0];
202         data = out = (unsigned char *)Mem_Alloc(tempmempool, tex->width * tex->height * 4);
203         if (!data)
204                 return NULL;
205         image_width = tex->width;
206         image_height = tex->height;
207         pal = in + (((image_width * image_height) * 85) >> 6);
208         pal += 2;
209         for (d = 0;d < image_width * image_height;d++)
210         {
211                 p = *in++;
212                 if (tex->name[0] == '{' && p == 255)
213                         out[0] = out[1] = out[2] = out[3] = 0;
214                 else
215                 {
216                         p *= 3;
217                         out[0] = pal[p];
218                         out[1] = pal[p+1];
219                         out[2] = pal[p+2];
220                         out[3] = 255;
221                 }
222                 out += 4;
223         }
224         return data;
225 }
226
227 unsigned char *W_GetTexture(char *name)
228 {
229         char texname[17];
230         int i, j;
231         qfile_t *file;
232         miptex_t *tex;
233         unsigned char *data;
234
235         texname[16] = 0;
236         W_CleanupName (name, texname);
237         for (i = 0;i < TEXWAD_MAXIMAGES;i++)
238         {
239                 if (texwadlump[i].name[0])
240                 {
241                         if (!strcmp(texname, texwadlump[i].name)) // found it
242                         {
243                                 file = texwadlump[i].file;
244                                 if (FS_Seek(file, texwadlump[i].position, SEEK_SET))
245                                 {Con_Print("W_GetTexture: corrupt WAD3 file\n");return NULL;}
246
247                                 tex = (miptex_t *)Mem_Alloc(tempmempool, texwadlump[i].size);
248                                 if (!tex)
249                                         return NULL;
250                                 if (FS_Read(file, tex, texwadlump[i].size) < texwadlump[i].size)
251                                 {Con_Print("W_GetTexture: corrupt WAD3 file\n");return NULL;}
252
253                                 tex->width = LittleLong(tex->width);
254                                 tex->height = LittleLong(tex->height);
255                                 for (j = 0;j < MIPLEVELS;j++)
256                                         tex->offsets[j] = LittleLong(tex->offsets[j]);
257                                 data = W_ConvertWAD3Texture(tex);
258                                 Mem_Free(tex);
259                                 return data;
260                         }
261                 }
262                 else
263                         break;
264         }
265         image_width = image_height = 0;
266         return NULL;
267 }
268