summaryrefslogtreecommitdiff
path: root/src/w_wad.c
blob: 397ec457814fc871220fc1cb56660407c5296171 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
// Emacs style mode select   -*- C++ -*- 
//-----------------------------------------------------------------------------
//
// Copyright(C) 1993-1996 Id Software, Inc.
// Copyright(C) 2005 Simon Howard
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
// 02111-1307, USA.
//
// DESCRIPTION:
//	Handles WAD file header, directory, lump I/O.
//
//-----------------------------------------------------------------------------




#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "doomtype.h"
#include "m_swap.h"
#include "i_system.h"
#include "i_video.h"
#include "z_zone.h"

#include "w_wad.h"

//
// GLOBALS
//

// Location of each lump on disk.

lumpinfo_t *lumpinfo;		
unsigned int numlumps = 0;

// Hash table for fast lookups

static lumpinfo_t **lumphash;

static int FileLength (FILE *handle)
{ 
    long savedpos;
    long length;
    // save the current position in the file
    savedpos = ftell(handle);
    
    // jump to the end and find the length
    fseek(handle, 0, SEEK_END);
    length = ftell(handle);

    // go back to the old location
    fseek(handle, savedpos, SEEK_SET);

    return length;
}


static void ExtractFileBase(char *path, char *dest)
{
    char*	src;
    int		length;

    src = path + strlen(path) - 1;
    
    // back up until a \ or the start
    while (src != path
	   && *(src-1) != '\\'
	   && *(src-1) != '/')
    {
	src--;
    }
    
    // copy up to eight characters
    memset (dest,0,8);
    length = 0;
    
    while (*src && *src != '.')
    {
	if (++length == 9)
	    I_Error ("Filename base of %s >8 chars",path);

	*dest++ = toupper((int)*src++);
    }
}

// Hash function used for lump names.
// Must be mod'ed with table size.
// Can be used for any 8-character names.
// by Lee Killough

unsigned int W_LumpNameHash(const char *s)
{
  unsigned int hash;

  ((hash =        toupper(s[0]), s[1]) &&
   (hash = hash*3+toupper(s[1]), s[2]) &&
   (hash = hash*2+toupper(s[2]), s[3]) &&
   (hash = hash*2+toupper(s[3]), s[4]) &&
   (hash = hash*2+toupper(s[4]), s[5]) &&
   (hash = hash*2+toupper(s[5]), s[6]) &&
   (hash = hash*2+toupper(s[6]),
    hash = hash*2+toupper(s[7]))
  );

  return hash;
}

//
// LUMP BASED ROUTINES.
//

//
// W_AddFile
// All files are optional, but at least one file must be
//  found (PWAD, if all required lumps are present).
// Files with a .wad extension are wadlink files
//  with multiple lumps.
// Other files are single lumps with the base filename
//  for the lump name.
//
// If filename starts with a tilde, the file is handled
//  specially to allow map reloads.
// But: the reload feature is a fragile hack...

unsigned int		reloadlump;
char*			reloadname;


FILE *W_AddFile (char *filename)
{
    wadinfo_t		header;
    lumpinfo_t*		lump_p;
    unsigned int	i;
    FILE               *handle;
    int			length;
    int			startlump;
    filelump_t*		fileinfo;
    filelump_t*         filerover;
    FILE               *storehandle;
    
    // open the file and add to directory

    // handle reload indicator.
    if (filename[0] == '~')
    {
	filename++;
	reloadname = filename;
	reloadlump = numlumps;
    }
		
    if ( (handle = fopen(filename,"rb")) == NULL)
    {
	printf (" couldn't open %s\n",filename);
	return NULL;
    }

    startlump = numlumps;
	
    if (strcasecmp(filename+strlen(filename)-3 , "wad" ) )
    {
	// single lump file

        // fraggle: Swap the filepos and size here.  The WAD directory
        // parsing code expects a little-endian directory, so will swap
        // them back.  Effectively we're constructing a "fake WAD directory"
        // here, as it would appear on disk.

	fileinfo = Z_Malloc(sizeof(filelump_t), PU_STATIC, 0);
	fileinfo->filepos = LONG(0);
	fileinfo->size = LONG(FileLength(handle));

        // Name the lump after the base of the filename (without the
        // extension).

	ExtractFileBase (filename, fileinfo->name);
	numlumps++;
    }
    else 
    {
	// WAD file
	fread (&header, sizeof(header), 1, handle);
	if (strncmp(header.identification,"IWAD",4))
	{
	    // Homebrew levels?
	    if (strncmp(header.identification,"PWAD",4))
	    {
		I_Error ("Wad file %s doesn't have IWAD "
			 "or PWAD id\n", filename);
	    }
	    
	    // ???modifiedgame = true;		
	}
	header.numlumps = LONG(header.numlumps);
	header.infotableofs = LONG(header.infotableofs);
	length = header.numlumps*sizeof(filelump_t);
	fileinfo = Z_Malloc(length, PU_STATIC, 0);
	fseek(handle, header.infotableofs, SEEK_SET);
	fread(fileinfo, length, 1, handle);
	numlumps += header.numlumps;
    }

    
    // Fill in lumpinfo
    lumpinfo = realloc (lumpinfo, numlumps*sizeof(lumpinfo_t));

    if (!lumpinfo)
	I_Error ("Couldn't realloc lumpinfo");

    lump_p = &lumpinfo[startlump];
	
    storehandle = reloadname ? NULL : handle;
	
    for (i=startlump,filerover=fileinfo ; i<numlumps ; i++,lump_p++, filerover++)
    {
	lump_p->handle = storehandle;
	lump_p->position = LONG(filerover->filepos);
	lump_p->size = LONG(filerover->size);
        lump_p->cache = NULL;
	strncpy (lump_p->name, filerover->name, 8);
    }
	
    if (reloadname)
	fclose (handle);

    Z_Free(fileinfo);

    if (lumphash != NULL)
    {
        Z_Free(lumphash);
        lumphash = NULL;
    }

    return handle;
}




//
// W_Reload
// Flushes any of the reloadable lumps in memory
//  and reloads the directory.
//
void W_Reload (void)
{
    wadinfo_t		header;
    int			lumpcount;
    lumpinfo_t*		lump_p;
    unsigned int	i;
    FILE               *handle;
    int			length;
    filelump_t*		fileinfo;
	
    if (!reloadname)
	return;
		
    if ( (handle = fopen(reloadname,"rb")) == NULL)
	I_Error ("W_Reload: couldn't open %s",reloadname);

    fread(&header, sizeof(header), 1, handle);
    lumpcount = LONG(header.numlumps);
    header.infotableofs = LONG(header.infotableofs);
    length = lumpcount*sizeof(filelump_t);
    fileinfo = Z_Malloc(length, PU_STATIC, 0);
    fseek(handle, header.infotableofs, SEEK_SET);
    fread(fileinfo, length, 1, handle);
    
    // Fill in lumpinfo
    lump_p = &lumpinfo[reloadlump];
	
    for (i=reloadlump ;
	 i<reloadlump+lumpcount ;
	 i++,lump_p++, fileinfo++)
    {
	if (lumpinfo[i].cache)
	    Z_Free (lumpinfo[i].cache);

	lump_p->position = LONG(fileinfo->filepos);
	lump_p->size = LONG(fileinfo->size);
    }
	
    fclose(handle);

    Z_Free(fileinfo);
}



//
// W_NumLumps
//
int W_NumLumps (void)
{
    return numlumps;
}



//
// W_CheckNumForName
// Returns -1 if name not found.
//

int W_CheckNumForName (char* name)
{
    lumpinfo_t *lump_p;
    int i;

    // Do we have a hash table yet?

    if (lumphash != NULL)
    {
        int hash;
        
        // We do! Excellent.

        hash = W_LumpNameHash(name) % numlumps;
        
        for (lump_p = lumphash[hash]; lump_p != NULL; lump_p = lump_p->next)
        {
            if (!strncasecmp(lump_p->name, name, 8))
            {
                return lump_p - lumpinfo;
            }
        }
    } 
    else
    {
        // We don't have a hash table generate yet. Linear search :-(
        // 
        // scan backwards so patch lump files take precedence

        for (i=numlumps-1; i >= 0; --i)
        {
            if (!strncasecmp(lumpinfo[i].name, name, 8))
            {
                return i;
            }
        }
    }

    // TFB. Not found.

    return -1;
}




//
// W_GetNumForName
// Calls W_CheckNumForName, but bombs out if not found.
//
int W_GetNumForName (char* name)
{
    int	i;

    i = W_CheckNumForName (name);
    
    if (i == -1)
      I_Error ("W_GetNumForName: %s not found!", name);
      
    return i;
}


//
// W_LumpLength
// Returns the buffer size needed to load the given lump.
//
int W_LumpLength (unsigned int lump)
{
    if (lump >= numlumps)
	I_Error ("W_LumpLength: %i >= numlumps",lump);

    return lumpinfo[lump].size;
}



//
// W_ReadLump
// Loads the lump into the given buffer,
//  which must be >= W_LumpLength().
//
void
W_ReadLump
( unsigned int	lump,
  void*		dest )
{
    int		c;
    lumpinfo_t*	l;
    FILE       *handle;
	
    if (lump >= numlumps)
	I_Error ("W_ReadLump: %i >= numlumps",lump);

    l = lumpinfo+lump;
	
    I_BeginRead ();
	
    if (l->handle == NULL)
    {
	// reloadable file, so use open / read / close
	if ( (handle = fopen(reloadname,"rb")) == NULL)
	    I_Error ("W_ReadLump: couldn't open %s",reloadname);
    }
    else
	handle = l->handle;
		
    fseek(handle, l->position, SEEK_SET);
    c = fread (dest, 1, l->size, handle);

    if (c < l->size)
	I_Error ("W_ReadLump: only read %i of %i on lump %i",
		 c,l->size,lump);	

    if (l->handle == NULL)
	fclose (handle);
		
    I_EndRead ();
}




//
// W_CacheLumpNum
//
void*
W_CacheLumpNum
( int		lump,
  int		tag )
{
    byte*	ptr;

    if ((unsigned)lump >= numlumps)
	I_Error ("W_CacheLumpNum: %i >= numlumps",lump);
		
    if (!lumpinfo[lump].cache)
    {
	// read the lump in
	
	//printf ("cache miss on lump %i\n",lump);
	ptr = Z_Malloc (W_LumpLength (lump), tag, &lumpinfo[lump].cache);
	W_ReadLump (lump, lumpinfo[lump].cache);
    }
    else
    {
	//printf ("cache hit on lump %i\n",lump);
	Z_ChangeTag (lumpinfo[lump].cache,tag);
    }
	
    return lumpinfo[lump].cache;
}



//
// W_CacheLumpName
//
void*
W_CacheLumpName
( char*		name,
  int		tag )
{
    return W_CacheLumpNum (W_GetNumForName(name), tag);
}

#if 0

//
// W_Profile
//
int		info[2500][10];
int		profilecount;

void W_Profile (void)
{
    int		i;
    memblock_t*	block;
    void*	ptr;
    char	ch;
    FILE*	f;
    int		j;
    char	name[9];
	
	
    for (i=0 ; i<numlumps ; i++)
    {	
	ptr = lumpinfo[i].cache;
	if (!ptr)
	{
	    ch = ' ';
	    continue;
	}
	else
	{
	    block = (memblock_t *) ( (byte *)ptr - sizeof(memblock_t));
	    if (block->tag < PU_PURGELEVEL)
		ch = 'S';
	    else
		ch = 'P';
	}
	info[i][profilecount] = ch;
    }
    profilecount++;
	
    f = fopen ("waddump.txt","w");
    name[8] = 0;

    for (i=0 ; i<numlumps ; i++)
    {
	memcpy (name,lumpinfo[i].name,8);

	for (j=0 ; j<8 ; j++)
	    if (!name[j])
		break;

	for ( ; j<8 ; j++)
	    name[j] = ' ';

	fprintf (f,"%s ",name);

	for (j=0 ; j<profilecount ; j++)
	    fprintf (f,"    %c",info[i][j]);

	fprintf (f,"\n");
    }
    fclose (f);
}


#endif

// Generate a hash table for fast lookups

void W_GenerateHashTable(void)
{
    unsigned int i;

    // Free the old hash table, if there is one

    if (lumphash != NULL)
    {
        Z_Free(lumphash);
    }

    // Generate hash table
    if (numlumps > 0)
    {
        lumphash = Z_Malloc(sizeof(lumpinfo_t *) * numlumps, PU_STATIC, NULL);
        memset(lumphash, 0, sizeof(lumpinfo_t *) * numlumps);

        for (i=0; i<numlumps; ++i)
        {
            unsigned int hash;

            hash = W_LumpNameHash(lumpinfo[i].name) % numlumps;

            // Hook into the hash table

            lumpinfo[i].next = lumphash[hash];
            lumphash[hash] = &lumpinfo[i];
        }
    }

    // All done!
}