]> git.wh0rd.org - fontconfig.git/blob - src/fccache.c
git.wh0rd.org / fontconfig.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Revert ABI changes from version 2.3
[fontconfig.git] / src / fccache.c
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 Keith Packard not be used in
10 * advertising or publicity pertaining to distribution of the software without
11 * specific, written prior permission. Keith Packard makes 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 * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
16 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
17 * EVENT SHALL KEITH PACKARD 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
24 #include "fcint.h"
25 #include "../fc-arch/fcarch.h"
26 #include <stdio.h>
27 #include <fcntl.h>
28 #include <dirent.h>
29 #include <string.h>
30 #include <sys/types.h>
31 #if defined(HAVE_MMAP) || defined(__CYGWIN__)
32 # include <unistd.h>
33 # include <sys/mman.h>
34 #elif defined(_WIN32)
35 # include <windows.h>
36 #endif
37
38 #ifndef O_BINARY
39 #define O_BINARY 0
40 #endif
41
42 struct MD5Context {
43 FcChar32 buf[4];
44 FcChar32 bits[2];
45 unsigned char in[64];
46 };
47
48 static void MD5Init(struct MD5Context *ctx);
49 static void MD5Update(struct MD5Context *ctx, unsigned char *buf, unsigned len);
50 static void MD5Final(unsigned char digest[16], struct MD5Context *ctx);
51 static void MD5Transform(FcChar32 buf[4], FcChar32 in[16]);
52
53 #define CACHEBASE_LEN (1 + 32 + 1 + sizeof (FC_ARCHITECTURE) + sizeof (FC_CACHE_SUFFIX))
54
55 static const char bin2hex[] = { '0', '1', '2', '3',
56 '4', '5', '6', '7',
57 '8', '9', 'a', 'b',
58 'c', 'd', 'e', 'f' };
59
60 static FcChar8 *
61 FcDirCacheBasename (const FcChar8 * dir, FcChar8 cache_base[CACHEBASE_LEN])
62 {
63 unsigned char hash[16];
64 FcChar8 *hex_hash;
65 int cnt;
66 struct MD5Context ctx;
67
68 MD5Init (&ctx);
69 MD5Update (&ctx, (unsigned char *)dir, strlen ((char *) dir));
70
71 MD5Final (hash, &ctx);
72
73 cache_base[0] = '/';
74 hex_hash = cache_base + 1;
75 for (cnt = 0; cnt < 16; ++cnt)
76 {
77 hex_hash[2*cnt ] = bin2hex[hash[cnt] >> 4];
78 hex_hash[2*cnt+1] = bin2hex[hash[cnt] & 0xf];
79 }
80 hex_hash[2*cnt] = 0;
81 strcat ((char *) cache_base, "-" FC_ARCHITECTURE FC_CACHE_SUFFIX);
82
83 return cache_base;
84 }
85
86 FcBool
87 FcDirCacheUnlink (const FcChar8 *dir, FcConfig *config)
88 {
89 FcChar8 *cache_hashed = NULL;
90 FcChar8 cache_base[CACHEBASE_LEN];
91 FcStrList *list;
92 FcChar8 *cache_dir;
93
94 FcDirCacheBasename (dir, cache_base);
95
96 list = FcStrListCreate (config->cacheDirs);
97 if (!list)
98 return FcFalse;
99
100 while ((cache_dir = FcStrListNext (list)))
101 {
102 cache_hashed = FcStrPlus (cache_dir, cache_base);
103 if (!cache_hashed)
104 break;
105 (void) unlink ((char *) cache_hashed);
106 }
107 FcStrListDone (list);
108 /* return FcFalse if something went wrong */
109 if (cache_dir)
110 return FcFalse;
111 return FcTrue;
112 }
113
114 static int
115 FcCacheReadDirs (FcConfig * config,
116 FcStrList *list, FcFontSet * set, FcStrSet *processed_dirs)
117 {
118 int ret = 0;
119 FcChar8 *dir;
120 FcStrSet *subdirs;
121 FcStrList *sublist;
122
123 /*
124 * Read in the results from 'list'.
125 */
126 while ((dir = FcStrListNext (list)))
127 {
128 if (!FcConfigAcceptFilename (config, dir))
129 continue;
130
131 /* Skip this directory if already updated
132 * to avoid the looped directories via symlinks
133 * Clearly a dir not in fonts.conf shouldn't be globally cached.
134 */
135
136 if (FcStrSetMember (processed_dirs, dir))
137 continue;
138 if (!FcStrSetAdd (processed_dirs, dir))
139 continue;
140
141 subdirs = FcStrSetCreate ();
142 if (!subdirs)
143 {
144 fprintf (stderr, "Can't create directory set\n");
145 ret++;
146 continue;
147 }
148
149 FcDirScanConfig (set, subdirs,
150 config->blanks, dir, FcFalse, config);
151
152 sublist = FcStrListCreate (subdirs);
153 FcStrSetDestroy (subdirs);
154 if (!sublist)
155 {
156 fprintf (stderr, "Can't create subdir list in \"%s\"\n", dir);
157 ret++;
158 continue;
159 }
160 ret += FcCacheReadDirs (config, sublist, set, processed_dirs);
161 }
162 FcStrListDone (list);
163 return ret;
164 }
165
166 FcFontSet *
167 FcCacheRead (FcConfig *config)
168 {
169 FcFontSet *s = FcFontSetCreate();
170 FcStrSet *processed_dirs;
171
172 if (!s)
173 return 0;
174
175 processed_dirs = FcStrSetCreate();
176 if (!processed_dirs)
177 goto bail;
178
179 if (FcCacheReadDirs (config, FcConfigGetConfigDirs (config), s, processed_dirs))
180 goto bail1;
181
182 FcStrSetDestroy (processed_dirs);
183 return s;
184
185 bail1:
186 FcStrSetDestroy (processed_dirs);
187 bail:
188 FcFontSetDestroy (s);
189 return 0;
190 }
191
192 /*
193 * Look for a cache file for the specified dir. Attempt
194 * to use each one we find, stopping when the callback
195 * indicates success
196 */
197 static FcBool
198 FcDirCacheProcess (FcConfig *config, const FcChar8 *dir,
199 FcBool (*callback) (int fd, off_t size, void *closure),
200 void *closure, FcChar8 **cache_file_ret)
201 {
202 int fd = -1;
203 FcChar8 cache_base[CACHEBASE_LEN];
204 FcStrList *list;
205 FcChar8 *cache_dir;
206 struct stat file_stat, dir_stat;
207 FcBool ret = FcFalse;
208
209 if (stat ((char *) dir, &dir_stat) < 0)
210 return FcFalse;
211
212 FcDirCacheBasename (dir, cache_base);
213
214 list = FcStrListCreate (config->cacheDirs);
215 if (!list)
216 return FcFalse;
217
218 while ((cache_dir = FcStrListNext (list)))
219 {
220 FcChar8 *cache_hashed = FcStrPlus (cache_dir, cache_base);
221 if (!cache_hashed)
222 break;
223 fd = open((char *) cache_hashed, O_RDONLY | O_BINARY);
224 if (fd >= 0) {
225 if (fstat (fd, &file_stat) >= 0 &&
226 dir_stat.st_mtime <= file_stat.st_mtime)
227 {
228 ret = (*callback) (fd, file_stat.st_size, closure);
229 if (ret)
230 {
231 if (cache_file_ret)
232 *cache_file_ret = cache_hashed;
233 else
234 FcStrFree (cache_hashed);
235 close (fd);
236 break;
237 }
238 }
239 close (fd);
240 }
241 FcStrFree (cache_hashed);
242 }
243 FcStrListDone (list);
244
245 return ret;
246 }
247
248 FcBool
249 FcDirCacheLoad (int fd, off_t size, void *closure)
250 {
251 FcCache *cache;
252 FcBool allocated = FcFalse;
253
254 if (size < sizeof (FcCache))
255 return FcFalse;
256 #if defined(HAVE_MMAP) || defined(__CYGWIN__)
257 cache = mmap (0, size, PROT_READ, MAP_SHARED, fd, 0);
258 #elif defined(_WIN32)
259 {
260 HANDLE hFileMap;
261
262 cache = NULL;
263 hFileMap = CreateFileMapping((HANDLE) _get_osfhandle(fd), NULL,
264 PAGE_READONLY, 0, 0, NULL);
265 if (hFileMap != NULL)
266 {
267 cache = MapViewOfFile (hFileMap, FILE_MAP_READ, 0, 0, size);
268 CloseHandle (hFileMap);
269 }
270 }
271 #endif
272 if (!cache)
273 {
274 cache = malloc (size);
275 if (!cache)
276 return FcFalse;
277
278 if (read (fd, cache, size) != size)
279 {
280 free (cache);
281 return FcFalse;
282 }
283 allocated = FcTrue;
284 }
285 if (cache->magic != FC_CACHE_MAGIC ||
286 cache->size != size)
287 {
288 if (allocated)
289 free (cache);
290 else
291 {
292 #if defined(HAVE_MMAP) || defined(__CYGWIN__)
293 munmap (cache, size);
294 #elif defined(_WIN32)
295 UnmapViewOfFile (cache);
296 #endif
297 }
298 return FcFalse;
299 }
300
301 /* Mark allocated caches so they're freed rather than unmapped */
302 if (allocated)
303 cache->magic = FC_CACHE_MAGIC_COPY;
304
305 *((FcCache **) closure) = cache;
306 return FcTrue;
307 }
308
309 FcCache *
310 FcDirCacheMap (const FcChar8 *dir, FcConfig *config, FcChar8 **cache_file)
311 {
312 FcCache *cache = NULL;
313
314 if (!FcDirCacheProcess (config, dir,
315 FcDirCacheLoad,
316 &cache, cache_file))
317 return NULL;
318 return cache;
319 }
320
321 FcBool
322 FcDirCacheRead (FcFontSet * set, FcStrSet * dirs,
323 const FcChar8 *dir, FcConfig *config)
324 {
325 FcCache *cache;
326 int i;
327 FcFontSet *cache_set;
328 intptr_t *cache_dirs;
329 FcPattern **cache_fonts;
330
331 cache = FcDirCacheMap (dir, config, NULL);
332 if (!cache)
333 return FcFalse;
334
335 cache_set = FcCacheSet (cache);
336 cache_fonts = FcFontSetFonts(cache_set);
337 if (FcDebug() & FC_DBG_CACHE)
338 printf ("FcDirCacheRead mapped cache for %s (%d fonts %d subdirs)\n",
339 dir, cache_set->nfont, cache->dirs_count);
340 for (i = 0; i < cache_set->nfont; i++)
341 {
342 FcPattern *font = FcEncodedOffsetToPtr (cache_set,
343 cache_fonts[i],
344 FcPattern);
345 if (FcDebug() & FC_DBG_CACHEV) {
346 printf ("Mapped font %d\n", i);
347 FcPatternPrint (font);
348 }
349 FcFontSetAdd (set, font);
350 }
351
352 cache_dirs = FcCacheDirs (cache);
353 for (i = 0; i < cache->dirs_count; i++)
354 FcStrSetAdd (dirs, FcOffsetToPtr (cache_dirs,
355 cache_dirs[i],
356 FcChar8));
357
358 if (config)
359 FcConfigAddFontDir (config, (FcChar8 *)dir);
360
361 return FcTrue;
362 }
363
364 static FcBool
365 FcDirCacheValidate (int fd, off_t size, void *closure)
366 {
367 FcBool ret = FcTrue;
368 FcCache c;
369 struct stat file_stat;
370
371 if (read (fd, &c, sizeof (FcCache)) != sizeof (FcCache))
372 ret = FcFalse;
373 else if (fstat (fd, &file_stat) < 0)
374 ret = FcFalse;
375 else if (c.magic != FC_CACHE_MAGIC)
376 ret = FcFalse;
377 else if (file_stat.st_size != c.size)
378 ret = FcFalse;
379 return ret;
380 }
381
382 static FcBool
383 FcDirCacheValidConfig (const FcChar8 *dir, FcConfig *config)
384 {
385 return FcDirCacheProcess (config, dir, FcDirCacheValidate, NULL, NULL);
386 }
387
388 FcBool
389 FcDirCacheValid (const FcChar8 *dir)
390 {
391 FcConfig *config;
392
393 config = FcConfigGetCurrent ();
394 if (!config)
395 return FcFalse;
396
397 return FcDirCacheValidConfig (dir, config);
398 }
399
400 void
401 FcDirCacheUnmap (FcCache *cache)
402 {
403 if (cache->magic == FC_CACHE_MAGIC_COPY)
404 {
405 free (cache);
406 return;
407 }
408 #if defined(HAVE_MMAP) || defined(__CYGWIN__)
409 munmap (cache, cache->size);
410 #elif defined(_WIN32)
411 UnmapViewOfFile (cache);
412 #endif
413 }
414
415 /*
416 * Cache file is:
417 *
418 * FcCache
419 * dir name
420 * subdirs
421 * FcFontSet
422 */
423
424 static FcCache *
425 FcDirCacheProduce (FcFontSet *set, const FcChar8 *dir, FcStrSet *dirs)
426 {
427 FcSerialize *serialize = FcSerializeCreate ();
428 FcCache *cache;
429 int i;
430 intptr_t cache_offset;
431 intptr_t dirs_offset;
432 FcChar8 *dir_serialize;
433 intptr_t *dirs_serialize;
434 FcFontSet *set_serialize;
435
436 if (!serialize)
437 return NULL;
438 /*
439 * Space for cache structure
440 */
441 cache_offset = FcSerializeReserve (serialize, sizeof (FcCache));
442 /*
443 * Directory name
444 */
445 if (!FcStrSerializeAlloc (serialize, dir))
446 goto bail1;
447 /*
448 * Subdirs
449 */
450 dirs_offset = FcSerializeAlloc (serialize, dirs, dirs->num * sizeof (FcChar8 *));
451 for (i = 0; i < dirs->num; i++)
452 if (!FcStrSerializeAlloc (serialize, dirs->strs[i]))
453 goto bail1;
454
455 /*
456 * Patterns
457 */
458 if (!FcFontSetSerializeAlloc (serialize, set))
459 goto bail1;
460
461 /* Serialize layout complete. Now allocate space and fill it */
462 cache = malloc (serialize->size);
463 if (!cache)
464 goto bail1;
465 /* shut up valgrind */
466 memset (cache, 0, serialize->size);
467
468 serialize->linear = cache;
469
470 cache->magic = FC_CACHE_MAGIC;
471 cache->size = serialize->size;
472
473 /*
474 * Serialize directory name
475 */
476 dir_serialize = FcStrSerialize (serialize, dir);
477 if (!dir_serialize)
478 goto bail2;
479 cache->dir = FcPtrToOffset (cache, dir_serialize);
480
481 /*
482 * Serialize sub dirs
483 */
484 dirs_serialize = FcSerializePtr (serialize, dirs);
485 if (!dirs_serialize)
486 goto bail2;
487 cache->dirs = FcPtrToOffset (cache, dirs_serialize);
488 cache->dirs_count = dirs->num;
489 for (i = 0; i < dirs->num; i++)
490 {
491 FcChar8 *d_serialize = FcStrSerialize (serialize, dirs->strs[i]);
492 if (!d_serialize)
493 goto bail2;
494 dirs_serialize[i] = FcPtrToOffset (dirs_serialize, d_serialize);
495 }
496
497 /*
498 * Serialize font set
499 */
500 set_serialize = FcFontSetSerialize (serialize, set);
501 if (!set_serialize)
502 goto bail2;
503 cache->set = FcPtrToOffset (cache, set_serialize);
504
505 FcSerializeDestroy (serialize);
506
507 return cache;
508
509 bail2:
510 free (cache);
511 bail1:
512 FcSerializeDestroy (serialize);
513 return NULL;
514 }
515
516 static FcBool
517 FcMakeDirectory (const FcChar8 *dir)
518 {
519 FcChar8 *parent;
520 FcBool ret;
521
522 if (strlen ((char *) dir) == 0)
523 return FcFalse;
524
525 parent = FcStrDirname (dir);
526 if (!parent)
527 return FcFalse;
528 if (access ((char *) parent, W_OK|X_OK) == 0)
529 ret = mkdir ((char *) dir, 0777) == 0;
530 else if (access ((char *) parent, F_OK) == -1)
531 ret = FcMakeDirectory (parent) && (mkdir ((char *) dir, 0777) == 0);
532 else
533 ret = FcFalse;
534 FcStrFree (parent);
535 return ret;
536 }
537
538 /* write serialized state to the cache file */
539 FcBool
540 FcDirCacheWrite (FcFontSet *set, FcStrSet *dirs, const FcChar8 *dir, FcConfig *config)
541 {
542 FcChar8 cache_base[CACHEBASE_LEN];
543 FcChar8 *cache_hashed;
544 int fd;
545 FcAtomic *atomic;
546 FcCache *cache;
547 FcStrList *list;
548 FcChar8 *cache_dir = NULL;
549 FcChar8 *test_dir;
550
551 /*
552 * Write it to the first directory in the list which is writable
553 */
554
555 list = FcStrListCreate (config->cacheDirs);
556 if (!list)
557 return FcFalse;
558 while ((test_dir = FcStrListNext (list))) {
559 if (access ((char *) test_dir, W_OK|X_OK) == 0)
560 {
561 cache_dir = test_dir;
562 break;
563 }
564 else
565 {
566 /*
567 * If the directory doesn't exist, try to create it
568 */
569 if (access ((char *) test_dir, F_OK) == -1) {
570 if (FcMakeDirectory (test_dir))
571 {
572 cache_dir = test_dir;
573 break;
574 }
575 }
576 }
577 }
578 FcStrListDone (list);
579 if (!cache_dir)
580 return FcFalse;
581
582 FcDirCacheBasename (dir, cache_base);
583 cache_hashed = FcStrPlus (cache_dir, cache_base);
584 if (!cache_hashed)
585 return FcFalse;
586
587 cache = FcDirCacheProduce (set, dir, dirs);
588
589 if (!cache)
590 goto bail1;
591
592 if (FcDebug () & FC_DBG_CACHE)
593 printf ("FcDirCacheWriteDir dir \"%s\" file \"%s\"\n",
594 dir, cache_hashed);
595
596 atomic = FcAtomicCreate ((FcChar8 *)cache_hashed);
597 if (!atomic)
598 goto bail2;
599
600 if (!FcAtomicLock (atomic))
601 goto bail3;
602
603 fd = open((char *)FcAtomicNewFile (atomic), O_RDWR | O_CREAT | O_BINARY, 0666);
604 if (fd == -1)
605 goto bail4;
606
607 if (write (fd, cache, cache->size) != cache->size)
608 {
609 perror ("write cache");
610 goto bail5;
611 }
612
613 close(fd);
614 if (!FcAtomicReplaceOrig(atomic))
615 goto bail4;
616 FcStrFree ((FcChar8 *)cache_hashed);
617 FcAtomicUnlock (atomic);
618 FcAtomicDestroy (atomic);
619 return FcTrue;
620
621 bail5:
622 close (fd);
623 bail4:
624 FcAtomicUnlock (atomic);
625 bail3:
626 FcAtomicDestroy (atomic);
627 bail2:
628 free (cache);
629 bail1:
630 FcStrFree ((FcChar8 *)cache_hashed);
631 return FcFalse;
632 }
633
634 /*
635 * This code implements the MD5 message-digest algorithm.
636 * The algorithm is due to Ron Rivest. This code was
637 * written by Colin Plumb in 1993, no copyright is claimed.
638 * This code is in the public domain; do with it what you wish.
639 *
640 * Equivalent code is available from RSA Data Security, Inc.
641 * This code has been tested against that, and is equivalent,
642 * except that you don't need to include two pages of legalese
643 * with every copy.
644 *
645 * To compute the message digest of a chunk of bytes, declare an
646 * MD5Context structure, pass it to MD5Init, call MD5Update as
647 * needed on buffers full of bytes, and then call MD5Final, which
648 * will fill a supplied 16-byte array with the digest.
649 */
650
651 #ifndef HIGHFIRST
652 #define byteReverse(buf, len) /* Nothing */
653 #else
654 /*
655 * Note: this code is harmless on little-endian machines.
656 */
657 void byteReverse(unsigned char *buf, unsigned longs)
658 {
659 FcChar32 t;
660 do {
661 t = (FcChar32) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
662 ((unsigned) buf[1] << 8 | buf[0]);
663 *(FcChar32 *) buf = t;
664 buf += 4;
665 } while (--longs);
666 }
667 #endif
668
669 /*
670 * Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
671 * initialization constants.
672 */
673 static void MD5Init(struct MD5Context *ctx)
674 {
675 ctx->buf[0] = 0x67452301;
676 ctx->buf[1] = 0xefcdab89;
677 ctx->buf[2] = 0x98badcfe;
678 ctx->buf[3] = 0x10325476;
679
680 ctx->bits[0] = 0;
681 ctx->bits[1] = 0;
682 }
683
684 /*
685 * Update context to reflect the concatenation of another buffer full
686 * of bytes.
687 */
688 static void MD5Update(struct MD5Context *ctx, unsigned char *buf, unsigned len)
689 {
690 FcChar32 t;
691
692 /* Update bitcount */
693
694 t = ctx->bits[0];
695 if ((ctx->bits[0] = t + ((FcChar32) len << 3)) < t)
696 ctx->bits[1]++; /* Carry from low to high */
697 ctx->bits[1] += len >> 29;
698
699 t = (t >> 3) & 0x3f; /* Bytes already in shsInfo->data */
700
701 /* Handle any leading odd-sized chunks */
702
703 if (t) {
704 unsigned char *p = (unsigned char *) ctx->in + t;
705
706 t = 64 - t;
707 if (len < t) {
708 memcpy(p, buf, len);
709 return;
710 }
711 memcpy(p, buf, t);
712 byteReverse(ctx->in, 16);
713 MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
714 buf += t;
715 len -= t;
716 }
717 /* Process data in 64-byte chunks */
718
719 while (len >= 64) {
720 memcpy(ctx->in, buf, 64);
721 byteReverse(ctx->in, 16);
722 MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
723 buf += 64;
724 len -= 64;
725 }
726
727 /* Handle any remaining bytes of data. */
728
729 memcpy(ctx->in, buf, len);
730 }
731
732 /*
733 * Final wrapup - pad to 64-byte boundary with the bit pattern
734 * 1 0* (64-bit count of bits processed, MSB-first)
735 */
736 static void MD5Final(unsigned char digest[16], struct MD5Context *ctx)
737 {
738 unsigned count;
739 unsigned char *p;
740
741 /* Compute number of bytes mod 64 */
742 count = (ctx->bits[0] >> 3) & 0x3F;
743
744 /* Set the first char of padding to 0x80. This is safe since there is
745 always at least one byte free */
746 p = ctx->in + count;
747 *p++ = 0x80;
748
749 /* Bytes of padding needed to make 64 bytes */
750 count = 64 - 1 - count;
751
752 /* Pad out to 56 mod 64 */
753 if (count < 8) {
754 /* Two lots of padding: Pad the first block to 64 bytes */
755 memset(p, 0, count);
756 byteReverse(ctx->in, 16);
757 MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
758
759 /* Now fill the next block with 56 bytes */
760 memset(ctx->in, 0, 56);
761 } else {
762 /* Pad block to 56 bytes */
763 memset(p, 0, count - 8);
764 }
765 byteReverse(ctx->in, 14);
766
767 /* Append length in bits and transform */
768 ((FcChar32 *) ctx->in)[14] = ctx->bits[0];
769 ((FcChar32 *) ctx->in)[15] = ctx->bits[1];
770
771 MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
772 byteReverse((unsigned char *) ctx->buf, 4);
773 memcpy(digest, ctx->buf, 16);
774 memset(ctx, 0, sizeof(ctx)); /* In case it's sensitive */
775 }
776
777
778 /* The four core functions - F1 is optimized somewhat */
779
780 /* #define F1(x, y, z) (x & y | ~x & z) */
781 #define F1(x, y, z) (z ^ (x & (y ^ z)))
782 #define F2(x, y, z) F1(z, x, y)
783 #define F3(x, y, z) (x ^ y ^ z)
784 #define F4(x, y, z) (y ^ (x | ~z))
785
786 /* This is the central step in the MD5 algorithm. */
787 #define MD5STEP(f, w, x, y, z, data, s) \
788 ( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
789
790 /*
791 * The core of the MD5 algorithm, this alters an existing MD5 hash to
792 * reflect the addition of 16 longwords of new data. MD5Update blocks
793 * the data and converts bytes into longwords for this routine.
794 */
795 static void MD5Transform(FcChar32 buf[4], FcChar32 in[16])
796 {
797 register FcChar32 a, b, c, d;
798
799 a = buf[0];
800 b = buf[1];
801 c = buf[2];
802 d = buf[3];
803
804 MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
805 MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
806 MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
807 MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
808 MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
809 MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
810 MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
811 MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
812 MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
813 MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
814 MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
815 MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
816 MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
817 MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
818 MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
819 MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
820
821 MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
822 MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
823 MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
824 MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
825 MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
826 MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
827 MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
828 MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
829 MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
830 MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
831 MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
832 MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
833 MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
834 MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
835 MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
836 MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
837
838 MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
839 MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
840 MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
841 MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
842 MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
843 MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
844 MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
845 MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
846 MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
847 MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
848 MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
849 MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
850 MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
851 MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
852 MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
853 MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
854
855 MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
856 MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
857 MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
858 MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
859 MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
860 MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
861 MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
862 MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
863 MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
864 MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
865 MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
866 MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
867 MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
868 MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
869 MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
870 MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
871
872 buf[0] += a;
873 buf[1] += b;
874 buf[2] += c;
875 buf[3] += d;
876 }
http://fontconfig.org/