1 /*
2 * Copyright © 2000 Keith Packard
3 * Copyright © 2005 Patrick Lam
4 *
5 * Permission to use, copy, modify, distribute, and sell this software and its
6 * documentation for any purpose is hereby granted without fee, provided that
7 * the above copyright notice appear in all copies and that both that
8 * copyright notice and this permission notice appear in supporting
9 * documentation, and that the name of the author(s) not be used in
10 * advertising or publicity pertaining to distribution of the software without
11 * specific, written prior permission. The authors make no
12 * representations about the suitability of this software for any purpose. It
13 * is provided "as is" without express or implied warranty.
14 *
15 * THE AUTHOR(S) DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
16 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
17 * EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY SPECIAL, INDIRECT OR
18 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
19 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
20 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
21 * PERFORMANCE OF THIS SOFTWARE.
22 */
23 #include "fcint.h"
24 #include "fcarch.h"
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <fcntl.h>
28 #include <dirent.h>
29 #include <string.h>
30 #include <sys/types.h>
31 #include <sys/stat.h>
32 #include <assert.h>
33 #if defined(HAVE_MMAP) || defined(__CYGWIN__)
34 # include <unistd.h>
35 # include <sys/mman.h>
36 #endif
37
38 #ifndef O_BINARY
39 #define O_BINARY 0
40 #endif
41
42
43 struct MD5Context {
44 FcChar32 buf[4];
45 FcChar32 bits[2];
46 unsigned char in[64];
47 };
48
49 static void MD5Init(struct MD5Context *ctx);
50 static void MD5Update(struct MD5Context *ctx, const unsigned char *buf, unsigned len);
51 static void MD5Final(unsigned char digest[16], struct MD5Context *ctx);
52 static void MD5Transform(FcChar32 buf[4], FcChar32 in[16]);
53
54 #define CACHEBASE_LEN (1 + 32 + 1 + sizeof (FC_ARCHITECTURE) + sizeof (FC_CACHE_SUFFIX))
55
56 static FcBool
FcCacheIsMmapSafe(int fd)57 FcCacheIsMmapSafe (int fd)
58 {
59 enum {
60 MMAP_NOT_INITIALIZED = 0,
61 MMAP_USE,
62 MMAP_DONT_USE,
63 MMAP_CHECK_FS,
64 } status;
65 static void *static_status;
66
67 status = (intptr_t) fc_atomic_ptr_get (&static_status);
68
69 if (status == MMAP_NOT_INITIALIZED)
70 {
71 const char *env = getenv ("FONTCONFIG_USE_MMAP");
72 FcBool use;
73 if (env && FcNameBool ((const FcChar8 *) env, &use))
74 status = use ? MMAP_USE : MMAP_DONT_USE;
75 else
76 status = MMAP_CHECK_FS;
77 (void) fc_atomic_ptr_cmpexch (&static_status, NULL, (void *) status);
78 }
79
80 if (status == MMAP_CHECK_FS)
81 return FcIsFsMmapSafe (fd);
82 else
83 return status == MMAP_USE;
84
85 }
86
87 static const char bin2hex[] = { '0', '1', '2', '3',
88 '4', '5', '6', '7',
89 '8', '9', 'a', 'b',
90 'c', 'd', 'e', 'f' };
91
92 static FcChar8 *
FcDirCacheBasename(const FcChar8 * dir,FcChar8 cache_base[CACHEBASE_LEN])93 FcDirCacheBasename (const FcChar8 * dir, FcChar8 cache_base[CACHEBASE_LEN])
94 {
95 unsigned char hash[16];
96 FcChar8 *hex_hash;
97 int cnt;
98 struct MD5Context ctx;
99
100 MD5Init (&ctx);
101 MD5Update (&ctx, (const unsigned char *)dir, strlen ((const char *) dir));
102
103 MD5Final (hash, &ctx);
104
105 cache_base[0] = '/';
106 hex_hash = cache_base + 1;
107 for (cnt = 0; cnt < 16; ++cnt)
108 {
109 hex_hash[2*cnt ] = bin2hex[hash[cnt] >> 4];
110 hex_hash[2*cnt+1] = bin2hex[hash[cnt] & 0xf];
111 }
112 hex_hash[2*cnt] = 0;
113 strcat ((char *) cache_base, "-" FC_ARCHITECTURE FC_CACHE_SUFFIX);
114
115 return cache_base;
116 }
117
118 FcBool
FcDirCacheUnlink(const FcChar8 * dir,FcConfig * config)119 FcDirCacheUnlink (const FcChar8 *dir, FcConfig *config)
120 {
121 FcChar8 *cache_hashed = NULL;
122 FcChar8 cache_base[CACHEBASE_LEN];
123 FcStrList *list;
124 FcChar8 *cache_dir;
125 const FcChar8 *sysroot = FcConfigGetSysRoot (config);
126
127 FcDirCacheBasename (dir, cache_base);
128
129 list = FcStrListCreate (config->cacheDirs);
130 if (!list)
131 return FcFalse;
132
133 while ((cache_dir = FcStrListNext (list)))
134 {
135 if (sysroot)
136 cache_hashed = FcStrBuildFilename (sysroot, cache_dir, cache_base, NULL);
137 else
138 cache_hashed = FcStrBuildFilename (cache_dir, cache_base, NULL);
139 if (!cache_hashed)
140 break;
141 (void) unlink ((char *) cache_hashed);
142 FcStrFree (cache_hashed);
143 }
144 FcStrListDone (list);
145 /* return FcFalse if something went wrong */
146 if (cache_dir)
147 return FcFalse;
148 return FcTrue;
149 }
150
151 static int
FcDirCacheOpenFile(const FcChar8 * cache_file,struct stat * file_stat)152 FcDirCacheOpenFile (const FcChar8 *cache_file, struct stat *file_stat)
153 {
154 int fd;
155
156 #ifdef _WIN32
157 if (FcStat (cache_file, file_stat) < 0)
158 return -1;
159 #endif
160 fd = FcOpen((char *) cache_file, O_RDONLY | O_BINARY);
161 if (fd < 0)
162 return fd;
163 #ifndef _WIN32
164 if (fstat (fd, file_stat) < 0)
165 {
166 close (fd);
167 return -1;
168 }
169 #endif
170 return fd;
171 }
172
173 /*
174 * Look for a cache file for the specified dir. Attempt
175 * to use each one we find, stopping when the callback
176 * indicates success
177 */
178 static FcBool
FcDirCacheProcess(FcConfig * config,const FcChar8 * dir,FcBool (* callback)(int fd,struct stat * fd_stat,struct stat * dir_stat,void * closure),void * closure,FcChar8 ** cache_file_ret)179 FcDirCacheProcess (FcConfig *config, const FcChar8 *dir,
180 FcBool (*callback) (int fd, struct stat *fd_stat,
181 struct stat *dir_stat, void *closure),
182 void *closure, FcChar8 **cache_file_ret)
183 {
184 int fd = -1;
185 FcChar8 cache_base[CACHEBASE_LEN];
186 FcStrList *list;
187 FcChar8 *cache_dir;
188 struct stat file_stat, dir_stat;
189 FcBool ret = FcFalse;
190
191 if (FcStatChecksum (dir, &dir_stat) < 0)
192 return FcFalse;
193
194 FcDirCacheBasename (dir, cache_base);
195
196 list = FcStrListCreate (config->cacheDirs);
197 if (!list)
198 return FcFalse;
199
200 while ((cache_dir = FcStrListNext (list)))
201 {
202 const FcChar8 *sysroot = FcConfigGetSysRoot (config);
203 FcChar8 *cache_hashed;
204
205 if (sysroot)
206 cache_hashed = FcStrBuildFilename (sysroot, cache_dir, cache_base, NULL);
207 else
208 cache_hashed = FcStrBuildFilename (cache_dir, cache_base, NULL);
209 if (!cache_hashed)
210 break;
211 fd = FcDirCacheOpenFile (cache_hashed, &file_stat);
212 if (fd >= 0) {
213 ret = (*callback) (fd, &file_stat, &dir_stat, closure);
214 close (fd);
215 if (ret)
216 {
217 if (cache_file_ret)
218 *cache_file_ret = cache_hashed;
219 else
220 FcStrFree (cache_hashed);
221 break;
222 }
223 }
224 FcStrFree (cache_hashed);
225 }
226 FcStrListDone (list);
227
228 return ret;
229 }
230
231 #define FC_CACHE_MIN_MMAP 1024
232
233 /*
234 * Skip list element, make sure the 'next' pointer is the last thing
235 * in the structure, it will be allocated large enough to hold all
236 * of the necessary pointers
237 */
238
239 typedef struct _FcCacheSkip FcCacheSkip;
240
241 struct _FcCacheSkip {
242 FcCache *cache;
243 FcRef ref;
244 intptr_t size;
245 dev_t cache_dev;
246 ino_t cache_ino;
247 time_t cache_mtime;
248 FcCacheSkip *next[1];
249 };
250
251 /*
252 * The head of the skip list; pointers for every possible level
253 * in the skip list, plus the largest level in the list
254 */
255
256 #define FC_CACHE_MAX_LEVEL 16
257
258 /* Protected by cache_lock below */
259 static FcCacheSkip *fcCacheChains[FC_CACHE_MAX_LEVEL];
260 static int fcCacheMaxLevel;
261
262
263 static FcMutex *cache_lock;
264
265 static void
lock_cache(void)266 lock_cache (void)
267 {
268 FcMutex *lock;
269 retry:
270 lock = fc_atomic_ptr_get (&cache_lock);
271 if (!lock) {
272 lock = (FcMutex *) malloc (sizeof (FcMutex));
273 FcMutexInit (lock);
274 if (!fc_atomic_ptr_cmpexch (&cache_lock, NULL, lock)) {
275 FcMutexFinish (lock);
276 goto retry;
277 }
278
279 FcMutexLock (lock);
280 /* Initialize random state */
281 FcRandom ();
282 return;
283 }
284 FcMutexLock (lock);
285 }
286
287 static void
unlock_cache(void)288 unlock_cache (void)
289 {
290 FcMutexUnlock (cache_lock);
291 }
292
293 static void
free_lock(void)294 free_lock (void)
295 {
296 FcMutex *lock;
297 lock = fc_atomic_ptr_get (&cache_lock);
298 if (lock && fc_atomic_ptr_cmpexch (&cache_lock, lock, NULL)) {
299 FcMutexFinish (lock);
300 free (lock);
301 }
302 }
303
304
305
306 /*
307 * Generate a random level number, distributed
308 * so that each level is 1/4 as likely as the one before
309 *
310 * Note that level numbers run 1 <= level <= MAX_LEVEL
311 */
312 static int
random_level(void)313 random_level (void)
314 {
315 /* tricky bit -- each bit is '1' 75% of the time */
316 long int bits = FcRandom () | FcRandom ();
317 int level = 0;
318
319 while (++level < FC_CACHE_MAX_LEVEL)
320 {
321 if (bits & 1)
322 break;
323 bits >>= 1;
324 }
325 return level;
326 }
327
328 /*
329 * Insert cache into the list
330 */
331 static FcBool
FcCacheInsert(FcCache * cache,struct stat * cache_stat)332 FcCacheInsert (FcCache *cache, struct stat *cache_stat)
333 {
334 FcCacheSkip **update[FC_CACHE_MAX_LEVEL];
335 FcCacheSkip *s, **next;
336 int i, level;
337
338 lock_cache ();
339
340 /*
341 * Find links along each chain
342 */
343 next = fcCacheChains;
344 for (i = fcCacheMaxLevel; --i >= 0; )
345 {
346 for (; (s = next[i]); next = s->next)
347 if (s->cache > cache)
348 break;
349 update[i] = &next[i];
350 }
351
352 /*
353 * Create new list element
354 */
355 level = random_level ();
356 if (level > fcCacheMaxLevel)
357 {
358 level = fcCacheMaxLevel + 1;
359 update[fcCacheMaxLevel] = &fcCacheChains[fcCacheMaxLevel];
360 fcCacheMaxLevel = level;
361 }
362
363 s = malloc (sizeof (FcCacheSkip) + (level - 1) * sizeof (FcCacheSkip *));
364 if (!s)
365 return FcFalse;
366
367 s->cache = cache;
368 s->size = cache->size;
369 FcRefInit (&s->ref, 1);
370 if (cache_stat)
371 {
372 s->cache_dev = cache_stat->st_dev;
373 s->cache_ino = cache_stat->st_ino;
374 s->cache_mtime = cache_stat->st_mtime;
375 }
376 else
377 {
378 s->cache_dev = 0;
379 s->cache_ino = 0;
380 s->cache_mtime = 0;
381 }
382
383 /*
384 * Insert into all fcCacheChains
385 */
386 for (i = 0; i < level; i++)
387 {
388 s->next[i] = *update[i];
389 *update[i] = s;
390 }
391
392 unlock_cache ();
393 return FcTrue;
394 }
395
396 static FcCacheSkip *
FcCacheFindByAddrUnlocked(void * object)397 FcCacheFindByAddrUnlocked (void *object)
398 {
399 int i;
400 FcCacheSkip **next = fcCacheChains;
401 FcCacheSkip *s;
402
403 if (!object)
404 return NULL;
405
406 /*
407 * Walk chain pointers one level at a time
408 */
409 for (i = fcCacheMaxLevel; --i >= 0;)
410 while (next[i] && (char *) object >= ((char *) next[i]->cache + next[i]->size))
411 next = next[i]->next;
412 /*
413 * Here we are
414 */
415 s = next[0];
416 if (s && (char *) object < ((char *) s->cache + s->size))
417 return s;
418 return NULL;
419 }
420
421 static FcCacheSkip *
FcCacheFindByAddr(void * object)422 FcCacheFindByAddr (void *object)
423 {
424 FcCacheSkip *ret;
425 lock_cache ();
426 ret = FcCacheFindByAddrUnlocked (object);
427 unlock_cache ();
428 return ret;
429 }
430
431 static void
FcCacheRemoveUnlocked(FcCache * cache)432 FcCacheRemoveUnlocked (FcCache *cache)
433 {
434 FcCacheSkip **update[FC_CACHE_MAX_LEVEL];
435 FcCacheSkip *s, **next;
436 int i;
437
438 /*
439 * Find links along each chain
440 */
441 next = fcCacheChains;
442 for (i = fcCacheMaxLevel; --i >= 0; )
443 {
444 for (; (s = next[i]); next = s->next)
445 if (s->cache >= cache)
446 break;
447 update[i] = &next[i];
448 }
449 s = next[0];
450 for (i = 0; i < fcCacheMaxLevel && *update[i] == s; i++)
451 *update[i] = s->next[i];
452 while (fcCacheMaxLevel > 0 && fcCacheChains[fcCacheMaxLevel - 1] == NULL)
453 fcCacheMaxLevel--;
454 free (s);
455 }
456
457 static FcCache *
FcCacheFindByStat(struct stat * cache_stat)458 FcCacheFindByStat (struct stat *cache_stat)
459 {
460 FcCacheSkip *s;
461
462 lock_cache ();
463 for (s = fcCacheChains[0]; s; s = s->next[0])
464 if (s->cache_dev == cache_stat->st_dev &&
465 s->cache_ino == cache_stat->st_ino &&
466 s->cache_mtime == cache_stat->st_mtime)
467 {
468 FcRefInc (&s->ref);
469 unlock_cache ();
470 return s->cache;
471 }
472 unlock_cache ();
473 return NULL;
474 }
475
476 static void
FcDirCacheDisposeUnlocked(FcCache * cache)477 FcDirCacheDisposeUnlocked (FcCache *cache)
478 {
479 FcCacheRemoveUnlocked (cache);
480
481 switch (cache->magic) {
482 case FC_CACHE_MAGIC_ALLOC:
483 free (cache);
484 break;
485 case FC_CACHE_MAGIC_MMAP:
486 #if defined(HAVE_MMAP) || defined(__CYGWIN__)
487 munmap (cache, cache->size);
488 #elif defined(_WIN32)
489 UnmapViewOfFile (cache);
490 #endif
491 break;
492 }
493 }
494
495 void
FcCacheObjectReference(void * object)496 FcCacheObjectReference (void *object)
497 {
498 FcCacheSkip *skip = FcCacheFindByAddr (object);
499
500 if (skip)
501 FcRefInc (&skip->ref);
502 }
503
504 void
FcCacheObjectDereference(void * object)505 FcCacheObjectDereference (void *object)
506 {
507 FcCacheSkip *skip;
508
509 lock_cache ();
510 skip = FcCacheFindByAddrUnlocked (object);
511 if (skip)
512 {
513 if (FcRefDec (&skip->ref) == 1)
514 FcDirCacheDisposeUnlocked (skip->cache);
515 }
516 unlock_cache ();
517 }
518
519 void
FcCacheFini(void)520 FcCacheFini (void)
521 {
522 int i;
523
524 for (i = 0; i < FC_CACHE_MAX_LEVEL; i++)
525 assert (fcCacheChains[i] == NULL);
526 assert (fcCacheMaxLevel == 0);
527
528 free_lock ();
529 }
530
531 static FcBool
FcCacheTimeValid(FcCache * cache,struct stat * dir_stat)532 FcCacheTimeValid (FcCache *cache, struct stat *dir_stat)
533 {
534 struct stat dir_static;
535
536 if (!dir_stat)
537 {
538 if (FcStatChecksum (FcCacheDir (cache), &dir_static) < 0)
539 return FcFalse;
540 dir_stat = &dir_static;
541 }
542 if (FcDebug () & FC_DBG_CACHE)
543 printf ("FcCacheTimeValid dir \"%s\" cache checksum %d dir checksum %d\n",
544 FcCacheDir (cache), cache->checksum, (int) dir_stat->st_mtime);
545 return cache->checksum == (int) dir_stat->st_mtime;
546 }
547
548 /*
549 * Map a cache file into memory
550 */
551 static FcCache *
FcDirCacheMapFd(int fd,struct stat * fd_stat,struct stat * dir_stat)552 FcDirCacheMapFd (int fd, struct stat *fd_stat, struct stat *dir_stat)
553 {
554 FcCache *cache;
555 FcBool allocated = FcFalse;
556
557 if (fd_stat->st_size < (int) sizeof (FcCache))
558 return NULL;
559 cache = FcCacheFindByStat (fd_stat);
560 if (cache)
561 {
562 if (FcCacheTimeValid (cache, dir_stat))
563 return cache;
564 FcDirCacheUnload (cache);
565 cache = NULL;
566 }
567
568 /*
569 * Large cache files are mmap'ed, smaller cache files are read. This
570 * balances the system cost of mmap against per-process memory usage.
571 */
572 if (FcCacheIsMmapSafe (fd) && fd_stat->st_size >= FC_CACHE_MIN_MMAP)
573 {
574 #if defined(HAVE_MMAP) || defined(__CYGWIN__)
575 cache = mmap (0, fd_stat->st_size, PROT_READ, MAP_SHARED, fd, 0);
576 #if (HAVE_POSIX_FADVISE) && defined(POSIX_FADV_WILLNEED)
577 posix_fadvise (fd, 0, fd_stat->st_size, POSIX_FADV_WILLNEED);
578 #endif
579 if (cache == MAP_FAILED)
580 cache = NULL;
581 #elif defined(_WIN32)
582 {
583 HANDLE hFileMap;
584
585 cache = NULL;
586 hFileMap = CreateFileMapping((HANDLE) _get_osfhandle(fd), NULL,
587 PAGE_READONLY, 0, 0, NULL);
588 if (hFileMap != NULL)
589 {
590 cache = MapViewOfFile (hFileMap, FILE_MAP_READ, 0, 0,
591 fd_stat->st_size);
592 CloseHandle (hFileMap);
593 }
594 }
595 #endif
596 }
597 if (!cache)
598 {
599 cache = malloc (fd_stat->st_size);
600 if (!cache)
601 return NULL;
602
603 if (read (fd, cache, fd_stat->st_size) != fd_stat->st_size)
604 {
605 free (cache);
606 return NULL;
607 }
608 allocated = FcTrue;
609 }
610 if (cache->magic != FC_CACHE_MAGIC_MMAP ||
611 cache->version < FC_CACHE_CONTENT_VERSION ||
612 cache->size != (intptr_t) fd_stat->st_size ||
613 !FcCacheTimeValid (cache, dir_stat) ||
614 !FcCacheInsert (cache, fd_stat))
615 {
616 if (allocated)
617 free (cache);
618 else
619 {
620 #if defined(HAVE_MMAP) || defined(__CYGWIN__)
621 munmap (cache, fd_stat->st_size);
622 #elif defined(_WIN32)
623 UnmapViewOfFile (cache);
624 #endif
625 }
626 return NULL;
627 }
628
629 /* Mark allocated caches so they're freed rather than unmapped */
630 if (allocated)
631 cache->magic = FC_CACHE_MAGIC_ALLOC;
632
633 return cache;
634 }
635
636 void
FcDirCacheReference(FcCache * cache,int nref)637 FcDirCacheReference (FcCache *cache, int nref)
638 {
639 FcCacheSkip *skip = FcCacheFindByAddr (cache);
640
641 if (skip)
642 FcRefAdd (&skip->ref, nref);
643 }
644
645 void
FcDirCacheUnload(FcCache * cache)646 FcDirCacheUnload (FcCache *cache)
647 {
648 FcCacheObjectDereference (cache);
649 }
650
651 static FcBool
FcDirCacheMapHelper(int fd,struct stat * fd_stat,struct stat * dir_stat,void * closure)652 FcDirCacheMapHelper (int fd, struct stat *fd_stat, struct stat *dir_stat, void *closure)
653 {
654 FcCache *cache = FcDirCacheMapFd (fd, fd_stat, dir_stat);
655
656 if (!cache)
657 return FcFalse;
658 *((FcCache **) closure) = cache;
659 return FcTrue;
660 }
661
662 FcCache *
FcDirCacheLoad(const FcChar8 * dir,FcConfig * config,FcChar8 ** cache_file)663 FcDirCacheLoad (const FcChar8 *dir, FcConfig *config, FcChar8 **cache_file)
664 {
665 FcCache *cache = NULL;
666
667 if (!FcDirCacheProcess (config, dir,
668 FcDirCacheMapHelper,
669 &cache, cache_file))
670 return NULL;
671 return cache;
672 }
673
674 FcCache *
FcDirCacheLoadFile(const FcChar8 * cache_file,struct stat * file_stat)675 FcDirCacheLoadFile (const FcChar8 *cache_file, struct stat *file_stat)
676 {
677 int fd;
678 FcCache *cache;
679 struct stat my_file_stat;
680
681 if (!file_stat)
682 file_stat = &my_file_stat;
683 fd = FcDirCacheOpenFile (cache_file, file_stat);
684 if (fd < 0)
685 return NULL;
686 cache = FcDirCacheMapFd (fd, file_stat, NULL);
687 close (fd);
688 return cache;
689 }
690
691 /*
692 * Validate a cache file by reading the header and checking
693 * the magic number and the size field
694 */
695 static FcBool
FcDirCacheValidateHelper(int fd,struct stat * fd_stat,struct stat * dir_stat,void * closure FC_UNUSED)696 FcDirCacheValidateHelper (int fd, struct stat *fd_stat, struct stat *dir_stat, void *closure FC_UNUSED)
697 {
698 FcBool ret = FcTrue;
699 FcCache c;
700
701 if (read (fd, &c, sizeof (FcCache)) != sizeof (FcCache))
702 ret = FcFalse;
703 else if (c.magic != FC_CACHE_MAGIC_MMAP)
704 ret = FcFalse;
705 else if (c.version < FC_CACHE_CONTENT_VERSION)
706 ret = FcFalse;
707 else if (fd_stat->st_size != c.size)
708 ret = FcFalse;
709 else if (c.checksum != (int) dir_stat->st_mtime)
710 ret = FcFalse;
711 return ret;
712 }
713
714 static FcBool
FcDirCacheValidConfig(const FcChar8 * dir,FcConfig * config)715 FcDirCacheValidConfig (const FcChar8 *dir, FcConfig *config)
716 {
717 return FcDirCacheProcess (config, dir,
718 FcDirCacheValidateHelper,
719 NULL, NULL);
720 }
721
722 FcBool
FcDirCacheValid(const FcChar8 * dir)723 FcDirCacheValid (const FcChar8 *dir)
724 {
725 FcConfig *config;
726
727 config = FcConfigGetCurrent ();
728 if (!config)
729 return FcFalse;
730
731 return FcDirCacheValidConfig (dir, config);
732 }
733
734 /*
735 * Build a cache structure from the given contents
736 */
737 FcCache *
FcDirCacheBuild(FcFontSet * set,const FcChar8 * dir,struct stat * dir_stat,FcStrSet * dirs)738 FcDirCacheBuild (FcFontSet *set, const FcChar8 *dir, struct stat *dir_stat, FcStrSet *dirs)
739 {
740 FcSerialize *serialize = FcSerializeCreate ();
741 FcCache *cache;
742 int i;
743 FcChar8 *dir_serialize;
744 intptr_t *dirs_serialize;
745 FcFontSet *set_serialize;
746
747 if (!serialize)
748 return NULL;
749 /*
750 * Space for cache structure
751 */
752 FcSerializeReserve (serialize, sizeof (FcCache));
753 /*
754 * Directory name
755 */
756 if (!FcStrSerializeAlloc (serialize, dir))
757 goto bail1;
758 /*
759 * Subdirs
760 */
761 FcSerializeAlloc (serialize, dirs, dirs->num * sizeof (FcChar8 *));
762 for (i = 0; i < dirs->num; i++)
763 if (!FcStrSerializeAlloc (serialize, dirs->strs[i]))
764 goto bail1;
765
766 /*
767 * Patterns
768 */
769 if (!FcFontSetSerializeAlloc (serialize, set))
770 goto bail1;
771
772 /* Serialize layout complete. Now allocate space and fill it */
773 cache = malloc (serialize->size);
774 if (!cache)
775 goto bail1;
776 /* shut up valgrind */
777 memset (cache, 0, serialize->size);
778
779 serialize->linear = cache;
780
781 cache->magic = FC_CACHE_MAGIC_ALLOC;
782 cache->version = FC_CACHE_CONTENT_VERSION;
783 cache->size = serialize->size;
784 cache->checksum = (int) dir_stat->st_mtime;
785
786 /*
787 * Serialize directory name
788 */
789 dir_serialize = FcStrSerialize (serialize, dir);
790 if (!dir_serialize)
791 goto bail2;
792 cache->dir = FcPtrToOffset (cache, dir_serialize);
793
794 /*
795 * Serialize sub dirs
796 */
797 dirs_serialize = FcSerializePtr (serialize, dirs);
798 if (!dirs_serialize)
799 goto bail2;
800 cache->dirs = FcPtrToOffset (cache, dirs_serialize);
801 cache->dirs_count = dirs->num;
802 for (i = 0; i < dirs->num; i++)
803 {
804 FcChar8 *d_serialize = FcStrSerialize (serialize, dirs->strs[i]);
805 if (!d_serialize)
806 goto bail2;
807 dirs_serialize[i] = FcPtrToOffset (dirs_serialize, d_serialize);
808 }
809
810 /*
811 * Serialize font set
812 */
813 set_serialize = FcFontSetSerialize (serialize, set);
814 if (!set_serialize)
815 goto bail2;
816 cache->set = FcPtrToOffset (cache, set_serialize);
817
818 FcSerializeDestroy (serialize);
819
820 FcCacheInsert (cache, NULL);
821
822 return cache;
823
824 bail2:
825 free (cache);
826 bail1:
827 FcSerializeDestroy (serialize);
828 return NULL;
829 }
830
831 FcCache *
FcDirCacheRebuild(FcCache * cache,struct stat * dir_stat,FcStrSet * dirs)832 FcDirCacheRebuild (FcCache *cache, struct stat *dir_stat, FcStrSet *dirs)
833 {
834 FcCache *new;
835 FcFontSet *set = FcFontSetDeserialize (FcCacheSet (cache));
836 const FcChar8 *dir = FcCacheDir (cache);
837
838 new = FcDirCacheBuild (set, dir, dir_stat, dirs);
839 FcFontSetDestroy (set);
840
841 return new;
842 }
843
844 /* write serialized state to the cache file */
845 FcBool
FcDirCacheWrite(FcCache * cache,FcConfig * config)846 FcDirCacheWrite (FcCache *cache, FcConfig *config)
847 {
848 FcChar8 *dir = FcCacheDir (cache);
849 FcChar8 cache_base[CACHEBASE_LEN];
850 FcChar8 *cache_hashed;
851 int fd;
852 FcAtomic *atomic;
853 FcStrList *list;
854 FcChar8 *cache_dir = NULL;
855 FcChar8 *test_dir, *d = NULL;
856 FcCacheSkip *skip;
857 struct stat cache_stat;
858 unsigned int magic;
859 int written;
860 const FcChar8 *sysroot = FcConfigGetSysRoot (config);
861
862 /*
863 * Write it to the first directory in the list which is writable
864 */
865
866 list = FcStrListCreate (config->cacheDirs);
867 if (!list)
868 return FcFalse;
869 while ((test_dir = FcStrListNext (list)))
870 {
871 if (d)
872 FcStrFree (d);
873 if (sysroot)
874 d = FcStrBuildFilename (sysroot, test_dir, NULL);
875 else
876 d = FcStrCopyFilename (test_dir);
877
878 if (access ((char *) d, W_OK) == 0)
879 {
880 cache_dir = FcStrCopyFilename (d);
881 break;
882 }
883 else
884 {
885 /*
886 * If the directory doesn't exist, try to create it
887 */
888 if (access ((char *) d, F_OK) == -1) {
889 if (FcMakeDirectory (d))
890 {
891 cache_dir = FcStrCopyFilename (d);
892 /* Create CACHEDIR.TAG */
893 FcDirCacheCreateTagFile (d);
894 break;
895 }
896 }
897 /*
898 * Otherwise, try making it writable
899 */
900 else if (chmod ((char *) d, 0755) == 0)
901 {
902 cache_dir = FcStrCopyFilename (d);
903 /* Try to create CACHEDIR.TAG too */
904 FcDirCacheCreateTagFile (d);
905 break;
906 }
907 }
908 }
909 if (d)
910 FcStrFree (d);
911 FcStrListDone (list);
912 if (!cache_dir)
913 return FcFalse;
914
915 FcDirCacheBasename (dir, cache_base);
916 cache_hashed = FcStrBuildFilename (cache_dir, cache_base, NULL);
917 if (!cache_hashed)
918 return FcFalse;
919 FcStrFree (cache_dir);
920
921 if (FcDebug () & FC_DBG_CACHE)
922 printf ("FcDirCacheWriteDir dir \"%s\" file \"%s\"\n",
923 dir, cache_hashed);
924
925 atomic = FcAtomicCreate ((FcChar8 *)cache_hashed);
926 if (!atomic)
927 goto bail1;
928
929 if (!FcAtomicLock (atomic))
930 goto bail3;
931
932 fd = FcOpen((char *)FcAtomicNewFile (atomic), O_RDWR | O_CREAT | O_BINARY, 0666);
933 if (fd == -1)
934 goto bail4;
935
936 /* Temporarily switch magic to MMAP while writing to file */
937 magic = cache->magic;
938 if (magic != FC_CACHE_MAGIC_MMAP)
939 cache->magic = FC_CACHE_MAGIC_MMAP;
940
941 /*
942 * Write cache contents to file
943 */
944 written = write (fd, cache, cache->size);
945
946 /* Switch magic back */
947 if (magic != FC_CACHE_MAGIC_MMAP)
948 cache->magic = magic;
949
950 if (written != cache->size)
951 {
952 perror ("write cache");
953 goto bail5;
954 }
955
956 close(fd);
957 if (!FcAtomicReplaceOrig(atomic))
958 goto bail4;
959
960 /* If the file is small, update the cache chain entry such that the
961 * new cache file is not read again. If it's large, we don't do that
962 * such that we reload it, using mmap, which is shared across processes.
963 */
964 if (cache->size < FC_CACHE_MIN_MMAP && FcStat (cache_hashed, &cache_stat))
965 {
966 lock_cache ();
967 if ((skip = FcCacheFindByAddrUnlocked (cache)))
968 {
969 skip->cache_dev = cache_stat.st_dev;
970 skip->cache_ino = cache_stat.st_ino;
971 skip->cache_mtime = cache_stat.st_mtime;
972 }
973 unlock_cache ();
974 }
975
976 FcStrFree (cache_hashed);
977 FcAtomicUnlock (atomic);
978 FcAtomicDestroy (atomic);
979 return FcTrue;
980
981 bail5:
982 close (fd);
983 bail4:
984 FcAtomicUnlock (atomic);
985 bail3:
986 FcAtomicDestroy (atomic);
987 bail1:
988 FcStrFree (cache_hashed);
989 return FcFalse;
990 }
991
992 FcBool
FcDirCacheClean(const FcChar8 * cache_dir,FcBool verbose)993 FcDirCacheClean (const FcChar8 *cache_dir, FcBool verbose)
994 {
995 DIR *d;
996 struct dirent *ent;
997 FcChar8 *dir;
998 FcBool ret = FcTrue;
999 FcBool remove;
1000 FcCache *cache;
1001 struct stat target_stat;
1002 const FcChar8 *sysroot;
1003
1004 /* FIXME: this API needs to support non-current FcConfig */
1005 sysroot = FcConfigGetSysRoot (NULL);
1006 if (sysroot)
1007 dir = FcStrBuildFilename (sysroot, cache_dir, NULL);
1008 else
1009 dir = FcStrCopyFilename (cache_dir);
1010 if (!dir)
1011 {
1012 fprintf (stderr, "Fontconfig error: %s: out of memory\n", cache_dir);
1013 return FcFalse;
1014 }
1015 if (access ((char *) dir, W_OK) != 0)
1016 {
1017 if (verbose || FcDebug () & FC_DBG_CACHE)
1018 printf ("%s: not cleaning %s cache directory\n", dir,
1019 access ((char *) dir, F_OK) == 0 ? "unwritable" : "non-existent");
1020 goto bail0;
1021 }
1022 if (verbose || FcDebug () & FC_DBG_CACHE)
1023 printf ("%s: cleaning cache directory\n", dir);
1024 d = opendir ((char *) dir);
1025 if (!d)
1026 {
1027 perror ((char *) dir);
1028 ret = FcFalse;
1029 goto bail0;
1030 }
1031 while ((ent = readdir (d)))
1032 {
1033 FcChar8 *file_name;
1034 const FcChar8 *target_dir;
1035
1036 if (ent->d_name[0] == '.')
1037 continue;
1038 /* skip cache files for different architectures and */
1039 /* files which are not cache files at all */
1040 if (strlen(ent->d_name) != 32 + strlen ("-" FC_ARCHITECTURE FC_CACHE_SUFFIX) ||
1041 strcmp(ent->d_name + 32, "-" FC_ARCHITECTURE FC_CACHE_SUFFIX))
1042 continue;
1043
1044 file_name = FcStrBuildFilename (dir, (FcChar8 *)ent->d_name, NULL);
1045 if (!file_name)
1046 {
1047 fprintf (stderr, "Fontconfig error: %s: allocation failure\n", dir);
1048 ret = FcFalse;
1049 break;
1050 }
1051 remove = FcFalse;
1052 cache = FcDirCacheLoadFile (file_name, NULL);
1053 if (!cache)
1054 {
1055 if (verbose || FcDebug () & FC_DBG_CACHE)
1056 printf ("%s: invalid cache file: %s\n", dir, ent->d_name);
1057 remove = FcTrue;
1058 }
1059 else
1060 {
1061 target_dir = FcCacheDir (cache);
1062 if (stat ((char *) target_dir, &target_stat) < 0)
1063 {
1064 if (verbose || FcDebug () & FC_DBG_CACHE)
1065 printf ("%s: %s: missing directory: %s \n",
1066 dir, ent->d_name, target_dir);
1067 remove = FcTrue;
1068 }
1069 FcDirCacheUnload (cache);
1070 }
1071 if (remove)
1072 {
1073 if (unlink ((char *) file_name) < 0)
1074 {
1075 perror ((char *) file_name);
1076 ret = FcFalse;
1077 }
1078 }
1079 FcStrFree (file_name);
1080 }
1081
1082 closedir (d);
1083 bail0:
1084 FcStrFree (dir);
1085
1086 return ret;
1087 }
1088
1089 /*
1090 * Hokey little macro trick to permit the definitions of C functions
1091 * with the same name as CPP macros
1092 */
1093 #define args1(x) (x)
1094 #define args2(x,y) (x,y)
1095
1096 const FcChar8 *
args1(const FcCache * c)1097 FcCacheDir args1(const FcCache *c)
1098 {
1099 return FcCacheDir (c);
1100 }
1101
1102 FcFontSet *
args1(const FcCache * c)1103 FcCacheCopySet args1(const FcCache *c)
1104 {
1105 FcFontSet *old = FcCacheSet (c);
1106 FcFontSet *new = FcFontSetCreate ();
1107 int i;
1108
1109 if (!new)
1110 return NULL;
1111 for (i = 0; i < old->nfont; i++)
1112 {
1113 FcPattern *font = FcFontSetFont (old, i);
1114
1115 FcPatternReference (font);
1116 if (!FcFontSetAdd (new, font))
1117 {
1118 FcFontSetDestroy (new);
1119 return NULL;
1120 }
1121 }
1122 return new;
1123 }
1124
1125 const FcChar8 *
args2(const FcCache * c,int i)1126 FcCacheSubdir args2(const FcCache *c, int i)
1127 {
1128 return FcCacheSubdir (c, i);
1129 }
1130
1131 int
args1(const FcCache * c)1132 FcCacheNumSubdir args1(const FcCache *c)
1133 {
1134 return c->dirs_count;
1135 }
1136
1137 int
args1(const FcCache * c)1138 FcCacheNumFont args1(const FcCache *c)
1139 {
1140 return FcCacheSet(c)->nfont;
1141 }
1142
1143 /*
1144 * This code implements the MD5 message-digest algorithm.
1145 * The algorithm is due to Ron Rivest. This code was
1146 * written by Colin Plumb in 1993, no copyright is claimed.
1147 * This code is in the public domain; do with it what you wish.
1148 *
1149 * Equivalent code is available from RSA Data Security, Inc.
1150 * This code has been tested against that, and is equivalent,
1151 * except that you don't need to include two pages of legalese
1152 * with every copy.
1153 *
1154 * To compute the message digest of a chunk of bytes, declare an
1155 * MD5Context structure, pass it to MD5Init, call MD5Update as
1156 * needed on buffers full of bytes, and then call MD5Final, which
1157 * will fill a supplied 16-byte array with the digest.
1158 */
1159
1160 #ifndef HIGHFIRST
1161 #define byteReverse(buf, len) /* Nothing */
1162 #else
1163 /*
1164 * Note: this code is harmless on little-endian machines.
1165 */
byteReverse(unsigned char * buf,unsigned longs)1166 void byteReverse(unsigned char *buf, unsigned longs)
1167 {
1168 FcChar32 t;
1169 do {
1170 t = (FcChar32) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
1171 ((unsigned) buf[1] << 8 | buf[0]);
1172 *(FcChar32 *) buf = t;
1173 buf += 4;
1174 } while (--longs);
1175 }
1176 #endif
1177
1178 /*
1179 * Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
1180 * initialization constants.
1181 */
MD5Init(struct MD5Context * ctx)1182 static void MD5Init(struct MD5Context *ctx)
1183 {
1184 ctx->buf[0] = 0x67452301;
1185 ctx->buf[1] = 0xefcdab89;
1186 ctx->buf[2] = 0x98badcfe;
1187 ctx->buf[3] = 0x10325476;
1188
1189 ctx->bits[0] = 0;
1190 ctx->bits[1] = 0;
1191 }
1192
1193 /*
1194 * Update context to reflect the concatenation of another buffer full
1195 * of bytes.
1196 */
MD5Update(struct MD5Context * ctx,const unsigned char * buf,unsigned len)1197 static void MD5Update(struct MD5Context *ctx, const unsigned char *buf, unsigned len)
1198 {
1199 FcChar32 t;
1200
1201 /* Update bitcount */
1202
1203 t = ctx->bits[0];
1204 if ((ctx->bits[0] = t + ((FcChar32) len << 3)) < t)
1205 ctx->bits[1]++; /* Carry from low to high */
1206 ctx->bits[1] += len >> 29;
1207
1208 t = (t >> 3) & 0x3f; /* Bytes already in shsInfo->data */
1209
1210 /* Handle any leading odd-sized chunks */
1211
1212 if (t) {
1213 unsigned char *p = (unsigned char *) ctx->in + t;
1214
1215 t = 64 - t;
1216 if (len < t) {
1217 memcpy(p, buf, len);
1218 return;
1219 }
1220 memcpy(p, buf, t);
1221 byteReverse(ctx->in, 16);
1222 MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
1223 buf += t;
1224 len -= t;
1225 }
1226 /* Process data in 64-byte chunks */
1227
1228 while (len >= 64) {
1229 memcpy(ctx->in, buf, 64);
1230 byteReverse(ctx->in, 16);
1231 MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
1232 buf += 64;
1233 len -= 64;
1234 }
1235
1236 /* Handle any remaining bytes of data. */
1237
1238 memcpy(ctx->in, buf, len);
1239 }
1240
1241 /*
1242 * Final wrapup - pad to 64-byte boundary with the bit pattern
1243 * 1 0* (64-bit count of bits processed, MSB-first)
1244 */
MD5Final(unsigned char digest[16],struct MD5Context * ctx)1245 static void MD5Final(unsigned char digest[16], struct MD5Context *ctx)
1246 {
1247 unsigned count;
1248 unsigned char *p;
1249
1250 /* Compute number of bytes mod 64 */
1251 count = (ctx->bits[0] >> 3) & 0x3F;
1252
1253 /* Set the first char of padding to 0x80. This is safe since there is
1254 always at least one byte free */
1255 p = ctx->in + count;
1256 *p++ = 0x80;
1257
1258 /* Bytes of padding needed to make 64 bytes */
1259 count = 64 - 1 - count;
1260
1261 /* Pad out to 56 mod 64 */
1262 if (count < 8) {
1263 /* Two lots of padding: Pad the first block to 64 bytes */
1264 memset(p, 0, count);
1265 byteReverse(ctx->in, 16);
1266 MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
1267
1268 /* Now fill the next block with 56 bytes */
1269 memset(ctx->in, 0, 56);
1270 } else {
1271 /* Pad block to 56 bytes */
1272 memset(p, 0, count - 8);
1273 }
1274 byteReverse(ctx->in, 14);
1275
1276 /* Append length in bits and transform */
1277 ((FcChar32 *) ctx->in)[14] = ctx->bits[0];
1278 ((FcChar32 *) ctx->in)[15] = ctx->bits[1];
1279
1280 MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
1281 byteReverse((unsigned char *) ctx->buf, 4);
1282 memcpy(digest, ctx->buf, 16);
1283 memset(ctx, 0, sizeof(*ctx)); /* In case it's sensitive */
1284 }
1285
1286
1287 /* The four core functions - F1 is optimized somewhat */
1288
1289 /* #define F1(x, y, z) (x & y | ~x & z) */
1290 #define F1(x, y, z) (z ^ (x & (y ^ z)))
1291 #define F2(x, y, z) F1(z, x, y)
1292 #define F3(x, y, z) (x ^ y ^ z)
1293 #define F4(x, y, z) (y ^ (x | ~z))
1294
1295 /* This is the central step in the MD5 algorithm. */
1296 #define MD5STEP(f, w, x, y, z, data, s) \
1297 ( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
1298
1299 /*
1300 * The core of the MD5 algorithm, this alters an existing MD5 hash to
1301 * reflect the addition of 16 longwords of new data. MD5Update blocks
1302 * the data and converts bytes into longwords for this routine.
1303 */
MD5Transform(FcChar32 buf[4],FcChar32 in[16])1304 static void MD5Transform(FcChar32 buf[4], FcChar32 in[16])
1305 {
1306 register FcChar32 a, b, c, d;
1307
1308 a = buf[0];
1309 b = buf[1];
1310 c = buf[2];
1311 d = buf[3];
1312
1313 MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
1314 MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
1315 MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
1316 MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
1317 MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
1318 MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
1319 MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
1320 MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
1321 MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
1322 MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
1323 MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
1324 MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
1325 MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
1326 MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
1327 MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
1328 MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
1329
1330 MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
1331 MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
1332 MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
1333 MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
1334 MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
1335 MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
1336 MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
1337 MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
1338 MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
1339 MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
1340 MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
1341 MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
1342 MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
1343 MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
1344 MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
1345 MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
1346
1347 MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
1348 MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
1349 MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
1350 MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
1351 MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
1352 MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
1353 MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
1354 MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
1355 MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
1356 MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
1357 MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
1358 MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
1359 MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
1360 MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
1361 MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
1362 MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
1363
1364 MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
1365 MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
1366 MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
1367 MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
1368 MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
1369 MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
1370 MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
1371 MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
1372 MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
1373 MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
1374 MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
1375 MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
1376 MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
1377 MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
1378 MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
1379 MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
1380
1381 buf[0] += a;
1382 buf[1] += b;
1383 buf[2] += c;
1384 buf[3] += d;
1385 }
1386
1387 FcBool
FcDirCacheCreateTagFile(const FcChar8 * cache_dir)1388 FcDirCacheCreateTagFile (const FcChar8 *cache_dir)
1389 {
1390 FcChar8 *cache_tag;
1391 int fd;
1392 FILE *fp;
1393 FcAtomic *atomic;
1394 static const FcChar8 cache_tag_contents[] =
1395 "Signature: 8a477f597d28d172789f06886806bc55\n"
1396 "# This file is a cache directory tag created by fontconfig.\n"
1397 "# For information about cache directory tags, see:\n"
1398 "# http://www.brynosaurus.com/cachedir/\n";
1399 static size_t cache_tag_contents_size = sizeof (cache_tag_contents) - 1;
1400 FcBool ret = FcFalse;
1401
1402 if (!cache_dir)
1403 return FcFalse;
1404
1405 if (access ((char *) cache_dir, W_OK) == 0)
1406 {
1407 /* Create CACHEDIR.TAG */
1408 cache_tag = FcStrBuildFilename (cache_dir, "CACHEDIR.TAG", NULL);
1409 if (!cache_tag)
1410 return FcFalse;
1411 atomic = FcAtomicCreate ((FcChar8 *)cache_tag);
1412 if (!atomic)
1413 goto bail1;
1414 if (!FcAtomicLock (atomic))
1415 goto bail2;
1416 fd = FcOpen((char *)FcAtomicNewFile (atomic), O_RDWR | O_CREAT, 0644);
1417 if (fd == -1)
1418 goto bail3;
1419 fp = fdopen(fd, "wb");
1420 if (fp == NULL)
1421 goto bail3;
1422
1423 fwrite(cache_tag_contents, cache_tag_contents_size, sizeof (FcChar8), fp);
1424 fclose(fp);
1425
1426 if (!FcAtomicReplaceOrig(atomic))
1427 goto bail3;
1428
1429 ret = FcTrue;
1430 bail3:
1431 FcAtomicUnlock (atomic);
1432 bail2:
1433 FcAtomicDestroy (atomic);
1434 bail1:
1435 FcStrFree (cache_tag);
1436 }
1437
1438 if (FcDebug () & FC_DBG_CACHE)
1439 {
1440 if (ret)
1441 printf ("Created CACHEDIR.TAG at %s\n", cache_dir);
1442 else
1443 printf ("Unable to create CACHEDIR.TAG at %s\n", cache_dir);
1444 }
1445
1446 return ret;
1447 }
1448
1449 void
FcCacheCreateTagFile(const FcConfig * config)1450 FcCacheCreateTagFile (const FcConfig *config)
1451 {
1452 FcChar8 *cache_dir = NULL, *d = NULL;
1453 FcStrList *list;
1454 const FcChar8 *sysroot = FcConfigGetSysRoot (config);
1455
1456 list = FcConfigGetCacheDirs (config);
1457 if (!list)
1458 return;
1459
1460 while ((cache_dir = FcStrListNext (list)))
1461 {
1462 if (d)
1463 FcStrFree (d);
1464 if (sysroot)
1465 d = FcStrBuildFilename (sysroot, cache_dir, NULL);
1466 else
1467 d = FcStrCopyFilename (cache_dir);
1468 if (FcDirCacheCreateTagFile (d))
1469 break;
1470 }
1471 if (d)
1472 FcStrFree (d);
1473 FcStrListDone (list);
1474 }
1475
1476 #define __fccache__
1477 #include "fcaliastail.h"
1478 #undef __fccache__
1479