/
mvl.c
471 lines (369 loc) · 12.4 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
/*
* MVL support routines for PhysicsFS.
*
* This driver handles Descent II Movielib archives.
*
* The file format of MVL is quite easy...
*
* //MVL File format - Written by Heiko Herrmann
* char sig[4] = {'D','M', 'V', 'L'}; // "DMVL"=Descent MoVie Library
*
* int num_files; // the number of files in this MVL
*
* struct {
* char file_name[13]; // Filename, padded to 13 bytes with 0s
* int file_size; // filesize in bytes
* }DIR_STRUCT[num_files];
*
* struct {
* char data[file_size]; // The file data
* }FILE_STRUCT[num_files];
*
* (That info is from http://www.descent2.com/ddn/specs/mvl/)
*
24
* Please see the file LICENSE.txt in the source's root directory.
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
*
* This file written by Bradley Bell.
* Based on grp.c by Ryan C. Gordon.
*/
#if (defined PHYSFS_SUPPORTS_MVL)
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "physfs.h"
#define __PHYSICSFS_INTERNAL__
#include "physfs_internal.h"
typedef struct
{
char name[13];
PHYSFS_uint32 startPos;
PHYSFS_uint32 size;
} MVLentry;
typedef struct
{
char *filename;
PHYSFS_sint64 last_mod_time;
PHYSFS_uint32 entryCount;
MVLentry *entries;
} MVLinfo;
typedef struct
{
void *handle;
MVLentry *entry;
PHYSFS_uint32 curPos;
} MVLfileinfo;
63
static void MVL_dirClose(dvoid *opaque)
64
{
65
MVLinfo *info = ((MVLinfo *) opaque);
66
67
68
allocator.Free(info->filename);
allocator.Free(info->entries);
allocator.Free(info);
69
70
71
} /* MVL_dirClose */
72
static PHYSFS_sint64 MVL_read(fvoid *opaque, void *buffer,
73
74
PHYSFS_uint32 objSize, PHYSFS_uint32 objCount)
{
75
MVLfileinfo *finfo = (MVLfileinfo *) opaque;
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
MVLentry *entry = finfo->entry;
PHYSFS_uint32 bytesLeft = entry->size - finfo->curPos;
PHYSFS_uint32 objsLeft = (bytesLeft / objSize);
PHYSFS_sint64 rc;
if (objsLeft < objCount)
objCount = objsLeft;
rc = __PHYSFS_platformRead(finfo->handle, buffer, objSize, objCount);
if (rc > 0)
finfo->curPos += (PHYSFS_uint32) (rc * objSize);
return(rc);
} /* MVL_read */
92
static PHYSFS_sint64 MVL_write(fvoid *opaque, const void *buffer,
93
94
95
96
97
98
PHYSFS_uint32 objSize, PHYSFS_uint32 objCount)
{
BAIL_MACRO(ERR_NOT_SUPPORTED, -1);
} /* MVL_write */
99
static int MVL_eof(fvoid *opaque)
100
{
101
MVLfileinfo *finfo = (MVLfileinfo *) opaque;
102
103
104
105
106
MVLentry *entry = finfo->entry;
return(finfo->curPos >= entry->size);
} /* MVL_eof */
107
static PHYSFS_sint64 MVL_tell(fvoid *opaque)
108
{
109
return(((MVLfileinfo *) opaque)->curPos);
110
111
112
} /* MVL_tell */
113
static int MVL_seek(fvoid *opaque, PHYSFS_uint64 offset)
114
{
115
MVLfileinfo *finfo = (MVLfileinfo *) opaque;
116
117
118
119
120
121
122
123
124
125
126
127
128
MVLentry *entry = finfo->entry;
int rc;
BAIL_IF_MACRO(offset < 0, ERR_INVALID_ARGUMENT, 0);
BAIL_IF_MACRO(offset >= entry->size, ERR_PAST_EOF, 0);
rc = __PHYSFS_platformSeek(finfo->handle, entry->startPos + offset);
if (rc)
finfo->curPos = (PHYSFS_uint32) offset;
return(rc);
} /* MVL_seek */
129
static PHYSFS_sint64 MVL_fileLength(fvoid *opaque)
130
{
131
MVLfileinfo *finfo = (MVLfileinfo *) opaque;
132
133
134
135
return((PHYSFS_sint64) finfo->entry->size);
} /* MVL_fileLength */
136
static int MVL_fileClose(fvoid *opaque)
137
{
138
MVLfileinfo *finfo = (MVLfileinfo *) opaque;
139
BAIL_IF_MACRO(!__PHYSFS_platformClose(finfo->handle), NULL, 0);
140
allocator.Free(finfo);
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
return(1);
} /* MVL_fileClose */
static int mvl_open(const char *filename, int forWriting,
void **fh, PHYSFS_uint32 *count)
{
PHYSFS_uint8 buf[4];
*fh = NULL;
BAIL_IF_MACRO(forWriting, ERR_ARC_IS_READ_ONLY, 0);
*fh = __PHYSFS_platformOpenRead(filename);
BAIL_IF_MACRO(*fh == NULL, NULL, 0);
if (__PHYSFS_platformRead(*fh, buf, 4, 1) != 1)
goto openMvl_failed;
if (memcmp(buf, "DMVL", 4) != 0)
{
__PHYSFS_setError(ERR_UNSUPPORTED_ARCHIVE);
goto openMvl_failed;
} /* if */
if (__PHYSFS_platformRead(*fh, count, sizeof (PHYSFS_uint32), 1) != 1)
goto openMvl_failed;
*count = PHYSFS_swapULE32(*count);
return(1);
openMvl_failed:
if (*fh != NULL)
__PHYSFS_platformClose(*fh);
*count = -1;
*fh = NULL;
return(0);
} /* mvl_open */
static int MVL_isArchive(const char *filename, int forWriting)
{
void *fh;
PHYSFS_uint32 fileCount;
int retval = mvl_open(filename, forWriting, &fh, &fileCount);
if (fh != NULL)
__PHYSFS_platformClose(fh);
return(retval);
} /* MVL_isArchive */
static int mvl_entry_cmp(void *_a, PHYSFS_uint32 one, PHYSFS_uint32 two)
{
197
198
199
200
201
202
203
if (one != two)
{
const MVLentry *a = (const MVLentry *) _a;
return(strcmp(a[one].name, a[two].name));
} /* if */
return 0;
204
205
206
207
208
} /* mvl_entry_cmp */
static void mvl_entry_swap(void *_a, PHYSFS_uint32 one, PHYSFS_uint32 two)
{
209
210
211
212
213
214
215
216
217
if (one != two)
{
MVLentry tmp;
MVLentry *first = &(((MVLentry *) _a)[one]);
MVLentry *second = &(((MVLentry *) _a)[two]);
memcpy(&tmp, first, sizeof (MVLentry));
memcpy(first, second, sizeof (MVLentry));
memcpy(second, &tmp, sizeof (MVLentry));
} /* if */
218
219
220
221
222
223
224
225
226
227
228
229
} /* mvl_entry_swap */
static int mvl_load_entries(const char *name, int forWriting, MVLinfo *info)
{
void *fh = NULL;
PHYSFS_uint32 fileCount;
PHYSFS_uint32 location = 8; /* sizeof sig. */
MVLentry *entry;
BAIL_IF_MACRO(!mvl_open(name, forWriting, &fh, &fileCount), NULL, 0);
info->entryCount = fileCount;
230
info->entries = (MVLentry *) allocator.Malloc(sizeof(MVLentry)*fileCount);
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
if (info->entries == NULL)
{
__PHYSFS_platformClose(fh);
BAIL_MACRO(ERR_OUT_OF_MEMORY, 0);
} /* if */
location += (17 * fileCount);
for (entry = info->entries; fileCount > 0; fileCount--, entry++)
{
if (__PHYSFS_platformRead(fh, &entry->name, 13, 1) != 1)
{
__PHYSFS_platformClose(fh);
return(0);
} /* if */
if (__PHYSFS_platformRead(fh, &entry->size, 4, 1) != 1)
{
__PHYSFS_platformClose(fh);
return(0);
} /* if */
entry->size = PHYSFS_swapULE32(entry->size);
entry->startPos = location;
location += entry->size;
} /* for */
__PHYSFS_platformClose(fh);
__PHYSFS_sort(info->entries, info->entryCount,
mvl_entry_cmp, mvl_entry_swap);
return(1);
} /* mvl_load_entries */
266
static void *MVL_openArchive(const char *name, int forWriting)
267
268
{
PHYSFS_sint64 modtime = __PHYSFS_platformGetLastModTime(name);
269
MVLinfo *info = (MVLinfo *) allocator.Malloc(sizeof (MVLinfo));
270
271
BAIL_IF_MACRO(info == NULL, ERR_OUT_OF_MEMORY, NULL);
272
273
memset(info, '\0', sizeof (MVLinfo));
274
info->filename = (char *) allocator.Malloc(strlen(name) + 1);
275
GOTO_IF_MACRO(!info->filename, ERR_OUT_OF_MEMORY, MVL_openArchive_failed);
276
277
278
279
280
if (!mvl_load_entries(name, forWriting, info))
goto MVL_openArchive_failed;
strcpy(info->filename, name);
info->last_mod_time = modtime;
281
return(info);
282
283
MVL_openArchive_failed:
284
if (info != NULL)
285
{
286
if (info->filename != NULL)
287
allocator.Free(info->filename);
288
if (info->entries != NULL)
289
290
allocator.Free(info->entries);
allocator.Free(info);
291
292
293
294
295
296
} /* if */
return(NULL);
} /* MVL_openArchive */
297
static void MVL_enumerateFiles(dvoid *opaque, const char *dname,
298
299
int omitSymLinks, PHYSFS_EnumFilesCallback cb,
const char *origdir, void *callbackdata)
300
301
{
/* no directories in MVL files. */
302
if (*dname == '\0')
303
304
305
306
307
{
MVLinfo *info = ((MVLinfo *) opaque);
MVLentry *entry = info->entries;
PHYSFS_uint32 max = info->entryCount;
PHYSFS_uint32 i;
308
309
for (i = 0; i < max; i++, entry++)
310
cb(callbackdata, origdir, entry->name);
311
} /* if */
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
} /* MVL_enumerateFiles */
static MVLentry *mvl_find_entry(MVLinfo *info, const char *name)
{
char *ptr = strchr(name, '.');
MVLentry *a = info->entries;
PHYSFS_sint32 lo = 0;
PHYSFS_sint32 hi = (PHYSFS_sint32) (info->entryCount - 1);
PHYSFS_sint32 middle;
int rc;
/*
* Rule out filenames to avoid unneeded processing...no dirs,
* big filenames, or extensions > 3 chars.
*/
BAIL_IF_MACRO((ptr) && (strlen(ptr) > 4), ERR_NO_SUCH_FILE, NULL);
BAIL_IF_MACRO(strlen(name) > 12, ERR_NO_SUCH_FILE, NULL);
BAIL_IF_MACRO(strchr(name, '/') != NULL, ERR_NO_SUCH_FILE, NULL);
while (lo <= hi)
{
middle = lo + ((hi - lo) / 2);
335
rc = __PHYSFS_stricmpASCII(name, a[middle].name);
336
337
338
339
340
341
342
343
344
345
346
347
if (rc == 0) /* found it! */
return(&a[middle]);
else if (rc > 0)
lo = middle + 1;
else
hi = middle - 1;
} /* while */
BAIL_MACRO(ERR_NO_SUCH_FILE, NULL);
} /* mvl_find_entry */
348
static int MVL_exists(dvoid *opaque, const char *name)
349
{
350
return(mvl_find_entry(((MVLinfo *) opaque), name) != NULL);
351
352
353
} /* MVL_exists */
354
static int MVL_isDirectory(dvoid *opaque, const char *name, int *fileExists)
355
{
356
*fileExists = MVL_exists(opaque, name);
357
358
359
360
return(0); /* never directories in a groupfile. */
} /* MVL_isDirectory */
361
static int MVL_isSymLink(dvoid *opaque, const char *name, int *fileExists)
362
{
363
*fileExists = MVL_exists(opaque, name);
364
365
366
367
return(0); /* never symlinks in a groupfile. */
} /* MVL_isSymLink */
368
static PHYSFS_sint64 MVL_getLastModTime(dvoid *opaque,
369
370
371
const char *name,
int *fileExists)
{
372
MVLinfo *info = ((MVLinfo *) opaque);
373
374
375
376
PHYSFS_sint64 retval = -1;
*fileExists = (mvl_find_entry(info, name) != NULL);
if (*fileExists) /* use time of MVL itself in the physical filesystem. */
377
retval = info->last_mod_time;
378
379
380
381
382
return(retval);
} /* MVL_getLastModTime */
383
static fvoid *MVL_openRead(dvoid *opaque, const char *fnm, int *fileExists)
384
{
385
MVLinfo *info = ((MVLinfo *) opaque);
386
387
388
389
390
391
392
MVLfileinfo *finfo;
MVLentry *entry;
entry = mvl_find_entry(info, fnm);
*fileExists = (entry != NULL);
BAIL_IF_MACRO(entry == NULL, NULL, NULL);
393
finfo = (MVLfileinfo *) allocator.Malloc(sizeof (MVLfileinfo));
394
BAIL_IF_MACRO(finfo == NULL, ERR_OUT_OF_MEMORY, NULL);
395
396
397
398
399
finfo->handle = __PHYSFS_platformOpenRead(info->filename);
if ( (finfo->handle == NULL) ||
(!__PHYSFS_platformSeek(finfo->handle, entry->startPos)) )
{
400
allocator.Free(finfo);
401
402
403
404
405
return(NULL);
} /* if */
finfo->curPos = 0;
finfo->entry = entry;
406
return(finfo);
407
408
409
} /* MVL_openRead */
410
static fvoid *MVL_openWrite(dvoid *opaque, const char *name)
411
412
413
414
415
{
BAIL_MACRO(ERR_NOT_SUPPORTED, NULL);
} /* MVL_openWrite */
416
static fvoid *MVL_openAppend(dvoid *opaque, const char *name)
417
418
419
420
421
{
BAIL_MACRO(ERR_NOT_SUPPORTED, NULL);
} /* MVL_openAppend */
422
static int MVL_remove(dvoid *opaque, const char *name)
423
424
425
426
427
{
BAIL_MACRO(ERR_NOT_SUPPORTED, 0);
} /* MVL_remove */
428
static int MVL_mkdir(dvoid *opaque, const char *name)
429
430
431
432
{
BAIL_MACRO(ERR_NOT_SUPPORTED, 0);
} /* MVL_mkdir */
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
const PHYSFS_ArchiveInfo __PHYSFS_ArchiveInfo_MVL =
{
"MVL",
MVL_ARCHIVE_DESCRIPTION,
"Bradley Bell <btb@icculus.org>",
"http://icculus.org/physfs/",
};
const PHYSFS_Archiver __PHYSFS_Archiver_MVL =
{
&__PHYSFS_ArchiveInfo_MVL,
MVL_isArchive, /* isArchive() method */
MVL_openArchive, /* openArchive() method */
MVL_enumerateFiles, /* enumerateFiles() method */
MVL_exists, /* exists() method */
MVL_isDirectory, /* isDirectory() method */
MVL_isSymLink, /* isSymLink() method */
MVL_getLastModTime, /* getLastModTime() method */
MVL_openRead, /* openRead() method */
MVL_openWrite, /* openWrite() method */
MVL_openAppend, /* openAppend() method */
MVL_remove, /* remove() method */
MVL_mkdir, /* mkdir() method */
MVL_dirClose, /* dirClose() method */
MVL_read, /* read() method */
MVL_write, /* write() method */
MVL_eof, /* eof() method */
MVL_tell, /* tell() method */
MVL_seek, /* seek() method */
MVL_fileLength, /* fileLength() method */
MVL_fileClose /* fileClose() method */
};
468
469
470
#endif /* defined PHYSFS_SUPPORTS_MVL */
/* end of mvl.c ... */