src/fccache.c

   1 /*
   2  * $RCSId: xc/lib/fontconfig/src/fccache.c,v 1.12 2002/08/22 07:36:44 keithp Exp $
   3  *
   4  * Copyright © 2000 Keith Packard
   5  * Copyright © 2005 Patrick Lam
   6  *
   7  * Permission to use, copy, modify, distribute, and sell this software and its
   8  * documentation for any purpose is hereby granted without fee, provided that
   9  * the above copyright notice appear in all copies and that both that
  10  * copyright notice and this permission notice appear in supporting
  11  * documentation, and that the name of Keith Packard not be used in
  12  * advertising or publicity pertaining to distribution of the software without
  13  * specific, written prior permission.  Keith Packard makes no
  14  * representations about the suitability of this software for any purpose.  It
  15  * is provided "as is" without express or implied warranty.
  16  *
  17  * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  18  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  19  * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  20  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  21  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  22  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  23  * PERFORMANCE OF THIS SOFTWARE.
  24  */
  25
  26 #include <fcntl.h>
  27 #include <dirent.h>
  28 #include <string.h>
  29 #include <sys/mman.h>
  30 #include <sys/utsname.h>
  31 #include <sys/types.h>
  32 #include <unistd.h>
  33 #include "fcint.h"
  34 #include <unistd.h>
  35
  36 #define ENDIAN_TEST 0x12345678
  37 #define MACHINE_SIGNATURE_SIZE 9 + 5*20 + 1
  38
  39 static int
  40 FcDirCacheOpen (const FcChar8 * dir);
  41
  42 static char *
  43 FcDirCacheHashName (char * cache_file, int collisions);
  44
  45 static off_t
  46 FcCacheSkipToArch (int fd, const char * arch);
  47
  48 static FcBool
  49 FcCacheCopyOld (int fd, int fd_orig, off_t start);
  50
  51 static void *
  52 FcDirCacheProduce (FcFontSet *set, FcCache * metadata);
  53
  54 static FcBool
  55 FcDirCacheConsume (int fd, const char * dir, FcFontSet *set, FcConfig *config);
  56
  57 static int
  58 FcCacheNextOffset(off_t w);
  59
  60 static char *
  61 FcCacheMachineSignature (void);
  62
  63 static FcBool
  64 FcCacheHaveBank (int bank);
  65
  66 static void
  67 FcCacheAddBankDir (int bank, const char * dir);
  68
  69 struct MD5Context {
  70         FcChar32 buf[4];
  71         FcChar32 bits[2];
  72         unsigned char in[64];
  73 };
  74
  75 static void MD5Init(struct MD5Context *ctx);
  76 static void MD5Update(struct MD5Context *ctx, unsigned char *buf, unsigned len);
  77 static void MD5Final(unsigned char digest[16], struct MD5Context *ctx);
  78 static void MD5Transform(FcChar32 buf[4], FcChar32 in[16]);
  79
  80 #define FC_DBG_CACHE_REF    1024
  81
  82 static char *
  83 FcCacheReadString (int fd, char *dest, int len)
  84 {
  85     FcChar8     c;
  86     FcBool      escape;
  87     int         size;
  88     int         i;
  89
  90     if (len == 0)
  91         return 0;
  92
  93     size = len;
  94     i = 0;
  95     escape = FcFalse;
  96     while (read (fd, &c, 1) == 1)
  97     {
  98         if (!escape)
  99         {
 100             switch (c) {
 101             case '"':
 102                 c = '\0';
 103                 break;
 104             case '\\':
 105                 escape = FcTrue;
 106                 continue;
 107             }
 108         }
 109         if (i == size)
 110         {
 111             dest[i++] = 0;
 112             return dest;
 113         }
 114         dest[i++] = c;
 115         if (c == '\0')
 116             return dest;
 117         escape = FcFalse;
 118     }
 119     return 0;
 120 }
 121
 122 static void
 123 FcCacheSkipString (int fd)
 124 {
 125     FcChar8     c;
 126     FcBool      escape;
 127
 128     escape = FcFalse;
 129     while (read (fd, &c, 1) == 1)
 130     {
 131         if (!escape)
 132         {
 133             switch (c) {
 134             case '"':
 135                 c = '\0';
 136                 break;
 137             case '\\':
 138                 escape = FcTrue;
 139                 continue;
 140             }
 141         }
 142         if (c == '\0')
 143             return;
 144         escape = FcFalse;
 145     }
 146     return;
 147 }
 148
 149 static FcBool
 150 FcCacheWriteString (int fd, const char *chars)
 151 {
 152     if (write (fd, chars, strlen(chars)+1) != strlen(chars)+1)
 153         return FcFalse;
 154     return FcTrue;
 155 }
 156
 157 static void
 158 FcGlobalCacheDirDestroy (FcGlobalCacheDir *d)
 159 {
 160     FcMemFree (FC_MEM_STRING, strlen (d->name)+1);
 161     free (d->name);
 162     FcMemFree (FC_MEM_CACHE, sizeof (FcGlobalCacheDir));
 163     free (d);
 164 }
 165
 166 FcGlobalCache *
 167 FcGlobalCacheCreate (void)
 168 {
 169     FcGlobalCache   *cache;
 170
 171     cache = malloc (sizeof (FcGlobalCache));
 172     if (!cache)
 173         return 0;
 174     FcMemAlloc (FC_MEM_CACHE, sizeof (FcGlobalCache));
 175     cache->dirs = 0;
 176     cache->updated = FcFalse;
 177     cache->fd = -1;
 178     return cache;
 179 }
 180
 181 void
 182 FcGlobalCacheDestroy (FcGlobalCache *cache)
 183 {
 184     FcGlobalCacheDir    *d, *next;
 185
 186     for (d = cache->dirs; d; d = next)
 187     {
 188         next = d->next;
 189         FcGlobalCacheDirDestroy (d);
 190     }
 191     FcMemFree (FC_MEM_CACHE, sizeof (FcGlobalCache));
 192     free (cache);
 193 }
 194
 195 void
 196 FcGlobalCacheLoad (FcGlobalCache    *cache,
 197                    FcStrSet         *staleDirs,
 198                    const FcChar8    *cache_file,
 199                    FcConfig         *config)
 200 {
 201     char                name_buf[FC_MAX_FILE_LEN];
 202     FcGlobalCacheDir    *d, *next;
 203     FcFileTime          config_time = FcConfigModifiedTime (config);
 204     char                * current_arch_machine_name;
 205     char                candidate_arch_machine_name[MACHINE_SIGNATURE_SIZE + 9];
 206     off_t               current_arch_start;
 207
 208     struct stat         cache_stat, dir_stat;
 209
 210     if (stat ((char *) cache_file, &cache_stat) < 0)
 211         return;
 212
 213     cache->fd = open ((char *) cache_file, O_RDONLY);
 214     if (cache->fd == -1)
 215         return;
 216
 217     cache->updated = FcFalse;
 218
 219     FcCacheReadString (cache->fd, name_buf, sizeof (name_buf));
 220     if (strcmp (name_buf, FC_GLOBAL_MAGIC_COOKIE) != 0)
 221         return;
 222
 223     current_arch_machine_name = FcCacheMachineSignature ();
 224     current_arch_start = FcCacheSkipToArch(cache->fd,
 225                                            current_arch_machine_name);
 226     if (current_arch_start < 0)
 227         goto bail_and_destroy;
 228
 229     lseek (cache->fd, current_arch_start, SEEK_SET);
 230     FcCacheReadString (cache->fd, candidate_arch_machine_name,
 231                        sizeof (candidate_arch_machine_name));
 232     if (strlen(candidate_arch_machine_name) == 0)
 233         goto bail_and_destroy;
 234
 235     while (1)
 236     {
 237         off_t targ;
 238
 239         FcCacheReadString (cache->fd, name_buf, sizeof (name_buf));
 240         if (!strlen(name_buf))
 241             break;
 242
 243         /* Directory must be older than the global cache file; also
 244            cache must be newer than the config file. */
 245         if (stat ((char *) name_buf, &dir_stat) < 0 ||
 246             dir_stat.st_mtime > cache_stat.st_mtime ||
 247             (config_time.set && cache_stat.st_mtime < config_time.time))
 248         {
 249             FcCache md;
 250
 251             FcStrSetAdd (staleDirs, FcStrCopy ((FcChar8 *)name_buf));
 252             read (cache->fd, &md, sizeof (FcCache));
 253             lseek (cache->fd, FcCacheNextOffset (lseek(cache->fd, 0, SEEK_CUR)) + md.count, SEEK_SET);
 254             continue;
 255         }
 256
 257         d = malloc (sizeof (FcGlobalCacheDir));
 258         if (!d)
 259             goto bail1;
 260
 261         d->next = cache->dirs;
 262         cache->dirs = d;
 263
 264         d->name = (char *)FcStrCopy ((FcChar8 *)name_buf);
 265         d->ent = 0;
 266         d->offset = lseek (cache->fd, 0, SEEK_CUR);
 267         if (read (cache->fd, &d->metadata, sizeof (FcCache)) != sizeof (FcCache))
 268             goto bail1;
 269         targ = FcCacheNextOffset (lseek(cache->fd, 0, SEEK_CUR)) + d->metadata.count;
 270         if (lseek (cache->fd, targ, SEEK_SET) != targ)
 271             goto bail1;
 272     }
 273     return;
 274
 275  bail1:
 276     for (d = cache->dirs; d; d = next)
 277     {
 278         next = d->next;
 279         free (d);
 280     }
 281     cache->dirs = 0;
 282
 283     close (cache->fd);
 284     cache->fd = -1;
 285     return;
 286
 287  bail_and_destroy:
 288     close (cache->fd);
 289     cache->fd = -1;
 290
 291     if (stat ((char *) cache_file, &cache_stat) == 0)
 292         unlink ((char *)cache_file);
 293
 294     return;
 295
 296 }
 297
 298 FcBool
 299 FcGlobalCacheReadDir (FcFontSet *set, FcStrSet *dirs, FcGlobalCache * cache, const char *dir, FcConfig *config)
 300 {
 301     FcGlobalCacheDir *d;
 302     FcBool ret = FcFalse;
 303
 304     if (cache->fd == -1)
 305         return FcFalse;
 306
 307     if (!(dir = (char *)FcConfigNormalizeFontDir (config, (FcChar8 *)dir)))
 308         return FcFalse; /* non-existing directory */
 309
 310     for (d = cache->dirs; d; d = d->next)
 311     {
 312         if (strncmp (d->name, dir, strlen(dir)) == 0)
 313         {
 314             lseek (cache->fd, d->offset, SEEK_SET);
 315             if (!FcDirCacheConsume (cache->fd, dir, set, config))
 316                 return FcFalse;
 317             if (strcmp (d->name, dir) == 0)
 318                 ret = FcTrue;
 319         }
 320     }
 321
 322     return ret;
 323 }
 324
 325 FcBool
 326 FcGlobalCacheUpdate (FcGlobalCache  *cache,
 327                      const char     *name,
 328                      FcFontSet      *set,
 329                      FcConfig       *config)
 330 {
 331     FcGlobalCacheDir * d;
 332
 333     name = (char *)FcConfigNormalizeFontDir (config, (FcChar8 *)name);
 334     for (d = cache->dirs; d; d = d->next)
 335     {
 336         if (strcmp(d->name, name) == 0)
 337             break;
 338     }
 339
 340     if (!d)
 341     {
 342         d = malloc (sizeof (FcGlobalCacheDir));
 343         if (!d)
 344             return FcFalse;
 345         d->next = cache->dirs;
 346         cache->dirs = d;
 347     }
 348
 349     cache->updated = FcTrue;
 350
 351     d->name = (char *)FcStrCopy ((FcChar8 *)name);
 352     d->ent = FcDirCacheProduce (set, &d->metadata);
 353     d->offset = 0;
 354     return FcTrue;
 355 }
 356
 357 FcBool
 358 FcGlobalCacheSave (FcGlobalCache    *cache,
 359                    const FcChar8    *cache_file,
 360                    FcConfig         *config)
 361 {
 362     int                 fd, fd_orig;
 363     FcGlobalCacheDir    *dir;
 364     FcAtomic            *atomic;
 365     off_t               current_arch_start = 0, truncate_to;
 366     char                * current_arch_machine_name, * header;
 367
 368     if (!cache->updated)
 369         return FcTrue;
 370
 371 #if defined (HAVE_GETUID) && defined (HAVE_GETEUID)
 372     /* Set-UID programs can't safely update the cache */
 373     if (getuid () != geteuid ())
 374         return FcFalse;
 375 #endif
 376
 377     atomic = FcAtomicCreate (cache_file);
 378     if (!atomic)
 379         return FcFalse;
 380
 381     if (!FcAtomicLock (atomic))
 382         goto bail1;
 383     fd = open ((char *) FcAtomicNewFile(atomic), O_RDWR | O_CREAT,
 384                S_IRUSR | S_IWUSR);
 385     if (fd == -1)
 386         goto bail2;
 387     FcCacheWriteString (fd, FC_GLOBAL_MAGIC_COOKIE);
 388
 389     fd_orig = open ((char *) FcAtomicOrigFile(atomic), O_RDONLY);
 390
 391     current_arch_machine_name = FcCacheMachineSignature ();
 392     if (fd_orig == -1)
 393         current_arch_start = 0;
 394     else
 395         current_arch_start = FcCacheSkipToArch (fd_orig,
 396                                                 current_arch_machine_name);
 397
 398     if (current_arch_start < 0)
 399     {
 400         off_t i = lseek(fd_orig, 0, SEEK_END);
 401         if (i < strlen (FC_GLOBAL_MAGIC_COOKIE)+1)
 402             i = strlen (FC_GLOBAL_MAGIC_COOKIE)+1;
 403         current_arch_start = FcCacheNextOffset (i);
 404     }
 405
 406     if (!FcCacheCopyOld(fd, fd_orig, current_arch_start))
 407         goto bail3;
 408
 409     close (fd_orig);
 410     fd_orig = -1;
 411
 412     current_arch_start = lseek(fd, 0, SEEK_CUR);
 413     if (ftruncate (fd, current_arch_start) == -1)
 414         goto bail3;
 415
 416     header = malloc (10 + strlen (current_arch_machine_name));
 417     if (!header)
 418         goto bail3;
 419
 420     truncate_to = current_arch_start + strlen(current_arch_machine_name) + 11;
 421     for (dir = cache->dirs; dir; dir = dir->next)
 422     {
 423         truncate_to += strlen(dir->name) + 1;
 424         truncate_to += sizeof (FcCache);
 425         truncate_to = FcCacheNextOffset (truncate_to);
 426         truncate_to += dir->metadata.count;
 427     }
 428     truncate_to -= current_arch_start;
 429
 430     sprintf (header, "%8x ", (int)truncate_to);
 431     strcat (header, current_arch_machine_name);
 432     if (!FcCacheWriteString (fd, header))
 433         goto bail4;
 434
 435     for (dir = cache->dirs; dir; dir = dir->next)
 436     {
 437         if (dir->name)
 438         {
 439             const char * d = (const char *)FcConfigNormalizeFontDir (config, (const FcChar8 *)dir->name);
 440
 441             FcCacheWriteString (fd, d);
 442             write (fd, &dir->metadata, sizeof(FcCache));
 443             lseek (fd, FcCacheNextOffset (lseek(fd, 0, SEEK_CUR)), SEEK_SET);
 444             write (fd, dir->ent, dir->metadata.count);
 445             free (dir->ent);
 446         }
 447     }
 448     FcCacheWriteString (fd, "");
 449
 450     if (close (fd) == -1)
 451         goto bail25;
 452
 453     if (!FcAtomicReplaceOrig (atomic))
 454         goto bail25;
 455
 456     FcAtomicUnlock (atomic);
 457     FcAtomicDestroy (atomic);
 458
 459     cache->updated = FcFalse;
 460     return FcTrue;
 461
 462  bail4:
 463     free (header);
 464  bail3:
 465     if (fd_orig != -1)
 466         close (fd_orig);
 467
 468     close (fd);
 469  bail25:
 470     FcAtomicDeleteNew (atomic);
 471  bail2:
 472     FcAtomicUnlock (atomic);
 473  bail1:
 474     FcAtomicDestroy (atomic);
 475     return FcFalse;
 476 }
 477
 478 /*
 479  * Find the next presumably-mmapable offset after the supplied file
 480  * position.
 481  */
 482 static int
 483 FcCacheNextOffset(off_t w)
 484 {
 485     static long pagesize = -1;
 486     if (pagesize == -1)
 487         pagesize = sysconf(_SC_PAGESIZE);
 488     if (w % pagesize == 0)
 489         return w;
 490     else
 491         return ((w / pagesize)+1)*pagesize;
 492 }
 493
 494 /* return the address of the segment for the provided arch,
 495  * or -1 if arch not found */
 496 static off_t
 497 FcCacheSkipToArch (int fd, const char * arch)
 498 {
 499     char candidate_arch_machine_name_count[MACHINE_SIGNATURE_SIZE + 9];
 500     char * candidate_arch;
 501     off_t current_arch_start = 0;
 502
 503     lseek (fd, 0, SEEK_SET);
 504     FcCacheSkipString (fd);
 505     current_arch_start = lseek (fd, 0, SEEK_CUR);
 506
 507     /* skip arches that are not the current arch */
 508     while (1)
 509     {
 510         long bs;
 511
 512         if (lseek (fd, current_arch_start, SEEK_SET) != current_arch_start)
 513             return -1;
 514
 515         if (FcCacheReadString (fd, candidate_arch_machine_name_count,
 516                                 sizeof (candidate_arch_machine_name_count)) == 0)
 517             return -1;
 518         if (!strlen(candidate_arch_machine_name_count))
 519             return -1;
 520         bs = strtol(candidate_arch_machine_name_count, &candidate_arch, 16);
 521
 522         // count = 0 should probably be distinguished from the !bs condition
 523         if (!bs || bs < strlen (candidate_arch_machine_name_count))
 524             return -1;
 525
 526         candidate_arch++; /* skip leading space */
 527
 528         if (strcmp (candidate_arch, arch)==0)
 529             return current_arch_start;
 530         current_arch_start += bs;
 531     }
 532
 533     return -1;
 534 }
 535
 536 /* Cuts out the segment at the file pointer (moves everything else
 537  * down to cover it), and leaves the file pointer at the end of the
 538  * file. */
 539 static FcBool
 540 FcCacheCopyOld (int fd, int fd_orig, off_t start)
 541 {
 542     char * buf = malloc (8192);
 543     char candidate_arch_machine_name[MACHINE_SIGNATURE_SIZE + 9];
 544     long bs;
 545     int c, bytes_skipped;
 546     off_t loc;
 547
 548     if (!buf)
 549         return FcFalse;
 550
 551     loc = 0;
 552     lseek (fd, 0, SEEK_SET); lseek (fd_orig, 0, SEEK_SET);
 553     do
 554     {
 555         int b = 8192;
 556         if (loc + b > start)
 557             b = start - loc;
 558
 559         if ((c = read (fd_orig, buf, b)) <= 0)
 560             break;
 561         if (write (fd, buf, c) < 0)
 562             goto bail;
 563
 564         loc += c;
 565     }
 566     while (c > 0);
 567
 568     lseek (fd, start, SEEK_SET);
 569     if (FcCacheReadString (fd, candidate_arch_machine_name,
 570                            sizeof (candidate_arch_machine_name)) == 0)
 571         goto done;
 572     if (!strlen(candidate_arch_machine_name))
 573         goto done;
 574
 575     bs = strtol(candidate_arch_machine_name, 0, 16);
 576     if (bs == 0)
 577         goto done;
 578
 579     bytes_skipped = 0;
 580     do
 581     {
 582         lseek (fd, start+bs+bytes_skipped, SEEK_SET);
 583         if ((c = read (fd, buf, 8192)) <= 0)
 584             break;
 585         lseek (fd, start+bytes_skipped, SEEK_SET);
 586         if (write (fd, buf, c) < 0)
 587             goto bail;
 588         bytes_skipped += c;
 589     }
 590     while (c > 0);
 591     lseek (fd, start+bytes_skipped, SEEK_SET);
 592
 593  done:
 594     free (buf);
 595     return FcTrue;
 596
 597  bail:
 598     free (buf);
 599     return FcFalse;
 600 }
 601
 602 /* Does not check that the cache has the appropriate arch section. */
 603 /* Also, this can be fooled if the original location has a stale
 604  * cache, and the hashed location has an up-to-date cache.  Oh well,
 605  * sucks to be you in that case! */
 606 FcBool
 607 FcDirCacheValid (const FcChar8 *dir)
 608 {
 609     struct stat file_stat, dir_stat;
 610     int         fd;
 611
 612     if (stat ((char *) dir, &dir_stat) < 0)
 613         return FcFalse;
 614
 615     fd = FcDirCacheOpen (dir);
 616
 617     if (fd < 0)
 618         goto bail;
 619     if (fstat (fd, &file_stat) < 0)
 620         goto bail;
 621
 622     close (fd);
 623
 624     /*
 625      * If the directory has been modified more recently than
 626      * the cache file, the cache is not valid
 627      */
 628     if (dir_stat.st_mtime > file_stat.st_mtime)
 629         return FcFalse;
 630
 631     return FcTrue;
 632
 633  bail:
 634     close (fd);
 635     return FcFalse;
 636 }
 637
 638 /* Assumes that the cache file in 'dir' exists.
 639  * Checks that the cache has the appropriate arch section. */
 640 FcBool
 641 FcDirCacheHasCurrentArch (const FcChar8 *dir)
 642 {
 643     int         fd;
 644     off_t       current_arch_start;
 645     char        *current_arch_machine_name;
 646
 647     fd = FcDirCacheOpen (dir);
 648     if (fd < 0)
 649         goto bail;
 650
 651     current_arch_machine_name = FcCacheMachineSignature();
 652     current_arch_start = FcCacheSkipToArch(fd, current_arch_machine_name);
 653     close (fd);
 654
 655     if (current_arch_start < 0)
 656         return FcFalse;
 657
 658     return FcTrue;
 659
 660  bail:
 661     return FcFalse;
 662 }
 663
 664 FcBool
 665 FcDirCacheUnlink (const FcChar8 *dir, FcConfig *config)
 666 {
 667     char        *cache_file;
 668     char        *cache_hashed = 0;
 669     int         fd, collisions;
 670     struct stat cache_stat;
 671     char        name_buf[FC_MAX_FILE_LEN];
 672
 673     dir = FcConfigNormalizeFontDir (config, dir);
 674     cache_file = (char *)FcStrPlus (dir, (FcChar8 *) "/" FC_DIR_CACHE_FILE);
 675     if (!cache_file)
 676         return FcFalse;
 677
 678     /* First remove normal cache file. */
 679     if (stat ((char *) cache_file, &cache_stat) == 0 &&
 680         unlink ((char *)cache_file) != 0)
 681         goto bail;
 682
 683     /* Next remove any applicable hashed files. */
 684     fd = -1; collisions = 0;
 685     do
 686     {
 687         if (cache_hashed)
 688             FcStrFree ((FcChar8 *)cache_hashed);
 689
 690         cache_hashed = FcDirCacheHashName (cache_file, collisions++);
 691         if (!cache_hashed)
 692             goto bail;
 693
 694         if (fd > 0)
 695             close (fd);
 696         fd = open(cache_hashed, O_RDONLY);
 697         if (fd == -1)
 698         {
 699             FcStrFree ((FcChar8 *)cache_file);
 700             return FcTrue;
 701         }
 702
 703         FcCacheReadString (fd, name_buf, sizeof (name_buf));
 704         if (!strlen(name_buf))
 705         {
 706             FcStrFree ((FcChar8 *)cache_hashed);
 707             goto bail;
 708         }
 709     } while (strcmp (name_buf, cache_file) != 0);
 710
 711     FcStrFree ((FcChar8 *)cache_file);
 712     close (fd);
 713
 714     if (stat ((char *) cache_hashed, &cache_stat) == 0 &&
 715         unlink ((char *)cache_hashed) != 0)
 716     {
 717         FcStrFree ((FcChar8 *)cache_hashed);
 718         goto bail;
 719     }
 720
 721     FcStrFree ((FcChar8 *)cache_hashed);
 722     return FcTrue;
 723
 724  bail:
 725     FcStrFree ((FcChar8 *)cache_file);
 726     return FcFalse;
 727 }
 728
 729 static int
 730 FcCacheReadDirs (FcConfig * config, FcGlobalCache * cache,
 731                  FcStrList *list, FcFontSet * set)
 732 {
 733     int                 ret = 0;
 734     FcChar8             *dir;
 735     FcChar8             *file, *base;
 736     FcStrSet            *subdirs;
 737     FcStrList           *sublist;
 738     struct stat         statb;
 739
 740     /*
 741      * Read in the results from 'list'.
 742      */
 743     while ((dir = FcStrListNext (list)))
 744     {
 745         if (!FcConfigAcceptFilename (config, dir))
 746             continue;
 747
 748         /* freed below */
 749         file = (FcChar8 *) malloc (strlen ((char *) dir) + 1 + FC_MAX_FILE_LEN + 1);
 750         if (!file)
 751             return FcFalse;
 752
 753         strcpy ((char *) file, (char *) dir);
 754         strcat ((char *) file, "/");
 755         base = file + strlen ((char *) file);
 756
 757         subdirs = FcStrSetCreate ();
 758         if (!subdirs)
 759         {
 760             fprintf (stderr, "Can't create directory set\n");
 761             ret++;
 762             free (file);
 763             continue;
 764         }
 765
 766         if (access ((char *) dir, X_OK) < 0)
 767         {
 768             switch (errno) {
 769             case ENOENT:
 770             case ENOTDIR:
 771             case EACCES:
 772                 break;
 773             default:
 774                 fprintf (stderr, "\"%s\": ", dir);
 775                 perror ("");
 776                 ret++;
 777             }
 778             FcStrSetDestroy (subdirs);
 779             free (file);
 780             continue;
 781         }
 782         if (stat ((char *) dir, &statb) == -1)
 783         {
 784             fprintf (stderr, "\"%s\": ", dir);
 785             perror ("");
 786             FcStrSetDestroy (subdirs);
 787             ret++;
 788             free (file);
 789             continue;
 790         }
 791         if (!S_ISDIR (statb.st_mode))
 792         {
 793             fprintf (stderr, "\"%s\": not a directory, skipping\n", dir);
 794             FcStrSetDestroy (subdirs);
 795             free (file);
 796             continue;
 797         }
 798         if (!FcDirCacheValid (dir) || !FcDirCacheRead (set, subdirs, dir, config))
 799         {
 800             if (FcDebug () & FC_DBG_FONTSET)
 801                 printf ("cache scan dir %s\n", dir);
 802
 803             FcDirScanConfig (set, subdirs, cache,
 804                              config->blanks, dir, FcFalse, config);
 805         }
 806         sublist = FcStrListCreate (subdirs);
 807         FcStrSetDestroy (subdirs);
 808         if (!sublist)
 809         {
 810             fprintf (stderr, "Can't create subdir list in \"%s\"\n", dir);
 811             ret++;
 812             free (file);
 813             continue;
 814         }
 815         ret += FcCacheReadDirs (config, cache, sublist, set);
 816         free (file);
 817     }
 818     FcStrListDone (list);
 819     return ret;
 820 }
 821
 822 FcFontSet *
 823 FcCacheRead (FcConfig *config, FcGlobalCache * cache)
 824 {
 825     FcFontSet * s = FcFontSetCreate();
 826     if (!s)
 827         return 0;
 828
 829     if (FcCacheReadDirs (config, cache, FcConfigGetConfigDirs (config), s))
 830         goto bail;
 831
 832     return s;
 833
 834  bail:
 835     FcFontSetDestroy (s);
 836     return 0;
 837 }
 838
 839 static const char bin2hex[] = { '0', '1', '2', '3',
 840                                 '4', '5', '6', '7',
 841                                 '8', '9', 'a', 'b',
 842                                 'c', 'd', 'e', 'f' };
 843
 844 static char *
 845 FcDirCacheHashName (char * cache_file, int collisions)
 846 {
 847     unsigned char       hash[16], hex_hash[33];
 848     char                *cache_hashed;
 849     unsigned char       uscore = '_';
 850     int                 cnt, i;
 851     FcChar8             *tmp;
 852     struct MD5Context   ctx;
 853
 854     MD5Init (&ctx);
 855     MD5Update (&ctx, (unsigned char *)cache_file, strlen (cache_file));
 856
 857     for (i = 0; i < collisions; i++)
 858         MD5Update (&ctx, &uscore, 1);
 859
 860     MD5Final (hash, &ctx);
 861
 862     for (cnt = 0; cnt < 16; ++cnt)
 863     {
 864         hex_hash[2*cnt] = bin2hex[hash[cnt] >> 4];
 865         hex_hash[2*cnt+1] = bin2hex[hash[cnt] & 0xf];
 866     }
 867     hex_hash[32] = 0;
 868
 869     tmp = FcStrPlus ((FcChar8 *)hex_hash, (FcChar8 *)FC_CACHE_SUFFIX);
 870     if (!tmp)
 871         return 0;
 872
 873     cache_hashed = (char *)FcStrPlus ((FcChar8 *)PKGCACHEDIR"/", tmp);
 874     free (tmp);
 875
 876     return cache_hashed;
 877 }
 878
 879 /* Opens the hashed name for cache_file.
 880  * This would fail in the unlikely event of a collision and subsequent
 881  * removal of the file which originally caused the collision. */
 882 static int
 883 FcDirCacheOpen (const FcChar8 *dir)
 884 {
 885     FcBool      found;
 886     int         fd = -1, collisions = 0;
 887     char        *cache_file, *cache_hashed;
 888     char        name_buf[FC_MAX_FILE_LEN];
 889     struct stat dir_stat;
 890
 891     cache_file = (char *)FcStrPlus (dir, (FcChar8 *) "/" FC_DIR_CACHE_FILE);
 892     if (!cache_file)
 893         return -1;
 894
 895     fd = open(cache_file, O_RDONLY);
 896     if (fd != -1)
 897         return fd;
 898
 899     if (stat ((char *)dir, &dir_stat) == -1)
 900         return -1;
 901
 902     found = FcFalse;
 903     do
 904     {
 905         struct stat c;
 906         FcChar8 * name_buf_dir;
 907
 908         cache_hashed = FcDirCacheHashName (cache_file, collisions++);
 909         if (!cache_hashed)
 910         {
 911             FcStrFree ((FcChar8 *)cache_file);
 912             return -1;
 913         }
 914
 915         if (fd > 0)
 916             close (fd);
 917         fd = open(cache_hashed, O_RDONLY);
 918         FcStrFree ((FcChar8 *)cache_hashed);
 919
 920         if (fd == -1)
 921         {
 922             FcStrFree ((FcChar8 *)cache_file);
 923             return -1;
 924         }
 925         FcCacheReadString (fd, name_buf, sizeof (name_buf));
 926         if (!strlen(name_buf))
 927             goto bail;
 928
 929         name_buf_dir = FcStrDirname ((FcChar8 *)name_buf);
 930         if (stat ((char *)name_buf_dir, &c) == -1)
 931         {
 932             FcStrFree (name_buf_dir);
 933             continue;
 934         }
 935         FcStrFree (name_buf_dir);
 936         found = (c.st_ino == dir_stat.st_ino) && (c.st_dev == dir_stat.st_dev);
 937     } while (!found);
 938     FcStrFree ((FcChar8 *)cache_file);
 939     return fd;
 940
 941  bail:
 942     FcStrFree ((FcChar8 *)cache_file);
 943     close (fd);
 944     return -1;
 945 }
 946
 947 /* read serialized state from the cache file */
 948 FcBool
 949 FcDirCacheRead (FcFontSet * set, FcStrSet * dirs, const FcChar8 *dir, FcConfig *config)
 950 {
 951     int         fd;
 952     char        *current_arch_machine_name;
 953     char        candidate_arch_machine_name[9+MACHINE_SIGNATURE_SIZE];
 954     off_t       current_arch_start = 0;
 955     char        subdirName[FC_MAX_FILE_LEN + 1 + 12 + 1];
 956
 957     fd = FcDirCacheOpen (dir);
 958     if (fd < 0)
 959         goto bail;
 960
 961     current_arch_machine_name = FcCacheMachineSignature();
 962     current_arch_start = FcCacheSkipToArch(fd,
 963                                            current_arch_machine_name);
 964     if (current_arch_start < 0)
 965         goto bail1;
 966
 967     lseek (fd, current_arch_start, SEEK_SET);
 968     if (FcCacheReadString (fd, candidate_arch_machine_name,
 969                            sizeof (candidate_arch_machine_name)) == 0)
 970         goto bail1;
 971
 972     while (strlen(FcCacheReadString (fd, subdirName, sizeof (subdirName))) > 0)
 973         FcStrSetAdd (dirs, (FcChar8 *)subdirName);
 974
 975     if (!FcDirCacheConsume (fd, (const char *)dir, set, config))
 976         goto bail1;
 977
 978     close(fd);
 979     return FcTrue;
 980
 981  bail1:
 982     close (fd);
 983  bail:
 984     return FcFalse;
 985 }
 986
 987 static FcBool
 988 FcDirCacheConsume (int fd, const char * dir, FcFontSet *set, FcConfig *config)
 989 {
 990     FcCache metadata;
 991     void * current_dir_block;
 992     off_t pos;
 993
 994     read(fd, &metadata, sizeof(FcCache));
 995     if (metadata.magic != FC_CACHE_MAGIC)
 996         return FcFalse;
 997
 998     if (!metadata.count)
 999     {
1000         pos = FcCacheNextOffset (lseek(fd, 0, SEEK_CUR));
1001         lseek (fd, pos, SEEK_SET);
1002         if (config)
1003             FcConfigAddFontDir (config, (FcChar8 *)dir);
1004         return FcTrue;
1005     }
1006
1007     pos = FcCacheNextOffset (lseek(fd, 0, SEEK_CUR));
1008     current_dir_block = mmap (0, metadata.count,
1009                               PROT_READ, MAP_SHARED, fd, pos);
1010     lseek (fd, pos+metadata.count, SEEK_SET);
1011     if (current_dir_block == MAP_FAILED)
1012         return FcFalse;
1013
1014     FcCacheAddBankDir (metadata.bank, dir);
1015     if (config)
1016         FcConfigAddFontDir (config, (FcChar8 *)dir);
1017
1018     if (!FcFontSetUnserialize (&metadata, set, current_dir_block))
1019         return FcFalse;
1020
1021     return FcTrue;
1022 }
1023
1024 static void *
1025 FcDirCacheProduce (FcFontSet *set, FcCache *metadata)
1026 {
1027     void * current_dir_block, * final_dir_block;
1028     static unsigned int rand_state = 0;
1029     int bank, needed_bytes_no_align;
1030
1031     if (!rand_state)
1032         rand_state = time(0L);
1033     bank = rand_r(&rand_state);
1034
1035     while (FcCacheHaveBank(bank))
1036         bank = rand_r(&rand_state);
1037
1038     memset (metadata, 0, sizeof(FcCache));
1039     FcFontSetNewBank();
1040     needed_bytes_no_align = FcFontSetNeededBytes (set);
1041     metadata->count = needed_bytes_no_align +
1042         FcFontSetNeededBytesAlign ();
1043     metadata->magic = FC_CACHE_MAGIC;
1044     metadata->bank = bank;
1045
1046     if (!needed_bytes_no_align) /* not a failure, no fonts to write */
1047     {
1048         /* no, you don't really need to write any bytes at all. */
1049         metadata->count = 0;
1050         return 0;
1051     }
1052
1053     current_dir_block = malloc (metadata->count);
1054     if (!current_dir_block)
1055         goto bail;
1056     // shut up valgrind
1057     memset (current_dir_block, 0, metadata->count);
1058     final_dir_block = FcFontSetDistributeBytes (metadata, current_dir_block);
1059
1060     if ((void *)((char *)current_dir_block+metadata->count) < final_dir_block)
1061         goto bail;
1062
1063     if (!FcFontSetSerialize (bank, set))
1064         goto bail;
1065
1066     return current_dir_block;
1067
1068  bail:
1069     free (current_dir_block);
1070     return 0;
1071 }
1072
1073 /* write serialized state to the cache file */
1074 FcBool
1075 FcDirCacheWrite (FcFontSet *set, FcStrSet *dirs, const FcChar8 *dir)
1076 {
1077     char            *cache_file;
1078     char            *cache_hashed;
1079     int             fd, fd_orig, i, dirs_count;
1080     FcAtomic        *atomic;
1081     FcCache         metadata;
1082     off_t           current_arch_start = 0, truncate_to;
1083     char            name_buf[FC_MAX_FILE_LEN];
1084     int             collisions;
1085
1086     char            *current_arch_machine_name, * header;
1087     void            *current_dir_block = 0;
1088
1089     dir = FcConfigNormalizeFontDir (FcConfigGetCurrent(), dir);
1090     if (!dir)
1091         return FcFalse;
1092
1093     cache_file = (char *)FcStrPlus (dir, (FcChar8 *) "/" FC_DIR_CACHE_FILE);
1094     if (!cache_file)
1095         goto bail;
1096
1097     /* Ensure that we're not trampling a cache for some other dir. */
1098     /* This is slightly different from FcDirCacheOpen, since it
1099      * needs the filename, not the file descriptor. */
1100     fd = -1; collisions = 0;
1101     do
1102     {
1103         cache_hashed = FcDirCacheHashName (cache_file, collisions++);
1104         if (!cache_hashed)
1105             goto bail0;
1106
1107         if (fd > 0)
1108             close (fd);
1109         fd = open(cache_hashed, O_RDONLY);
1110         if (fd == -1)
1111             break;
1112         FcCacheReadString (fd, name_buf, sizeof (name_buf));
1113         close (fd);
1114
1115         if (!strlen(name_buf))
1116             break;
1117
1118         if (strcmp (name_buf, cache_file) != 0)
1119             continue;
1120     } while (0);
1121
1122     current_dir_block = FcDirCacheProduce (set, &metadata);
1123
1124     if (metadata.count && !current_dir_block)
1125         goto bail1;
1126
1127     if (FcDebug () & FC_DBG_CACHE)
1128         printf ("FcDirCacheWriteDir cache_file \"%s\"\n", cache_file);
1129
1130     atomic = FcAtomicCreate ((FcChar8 *)cache_hashed);
1131     if (!atomic)
1132         goto bail1;
1133
1134     if (!FcAtomicLock (atomic))
1135     {
1136         /* Now try rewriting the original version of the file. */
1137         FcAtomicDestroy (atomic);
1138
1139         atomic = FcAtomicCreate ((FcChar8 *)cache_file);
1140         fd_orig = open (cache_file, O_RDONLY);
1141         if (fd_orig == -1)
1142             fd_orig = open((char *)FcAtomicOrigFile (atomic), O_RDONLY);
1143
1144         fd = open((char *)FcAtomicNewFile (atomic), O_RDWR | O_CREAT, 0666);
1145         if (fd == -1)
1146             goto bail2;
1147     }
1148
1149     /* In all cases, try opening the real location of the cache file first. */
1150     /* (even if that's not atomic.) */
1151     fd_orig = open (cache_file, O_RDONLY);
1152     if (fd_orig == -1)
1153         fd_orig = open((char *)FcAtomicOrigFile (atomic), O_RDONLY);
1154
1155     fd = open((char *)FcAtomicNewFile (atomic), O_RDWR | O_CREAT, 0666);
1156     if (fd == -1)
1157         goto bail3;
1158
1159     FcCacheWriteString (fd, cache_file);
1160
1161     current_arch_machine_name = FcCacheMachineSignature ();
1162     current_arch_start = 0;
1163
1164     if (fd_orig != -1)
1165         current_arch_start =
1166             FcCacheSkipToArch(fd_orig, current_arch_machine_name);
1167
1168     if (current_arch_start < 0)
1169     {
1170         off_t i = lseek(fd_orig, 0, SEEK_END);
1171         if (i < strlen (FC_GLOBAL_MAGIC_COOKIE)+1)
1172             i = strlen (FC_GLOBAL_MAGIC_COOKIE)+1;
1173         current_arch_start = FcCacheNextOffset (i);
1174     }
1175
1176     if (fd_orig != -1 && !FcCacheCopyOld(fd, fd_orig, current_arch_start))
1177         goto bail4;
1178
1179     if (fd_orig != -1)
1180         close (fd_orig);
1181
1182     current_arch_start = lseek(fd, 0, SEEK_CUR);
1183     if (ftruncate (fd, current_arch_start) == -1)
1184         goto bail4;
1185
1186     /* allocate space for subdir names in this block */
1187     dirs_count = 0;
1188     for (i = 0; i < dirs->size; i++)
1189         dirs_count += strlen((char *)dirs->strs[i]) + 1;
1190     dirs_count ++;
1191
1192     /* now write the address of the next offset */
1193     truncate_to = FcCacheNextOffset (FcCacheNextOffset (current_arch_start + sizeof (FcCache) + dirs_count) + metadata.count) - current_arch_start;
1194     header = malloc (10 + strlen (current_arch_machine_name));
1195     if (!header)
1196         goto bail4;
1197     sprintf (header, "%8x ", (int)truncate_to);
1198     strcat (header, current_arch_machine_name);
1199     if (!FcCacheWriteString (fd, header))
1200         goto bail5;
1201
1202     for (i = 0; i < dirs->size; i++)
1203         FcCacheWriteString (fd, (char *)dirs->strs[i]);
1204     FcCacheWriteString (fd, "");
1205
1206     write (fd, &metadata, sizeof(FcCache));
1207     if (metadata.count)
1208     {
1209         lseek (fd, FcCacheNextOffset (lseek(fd, 0, SEEK_END)), SEEK_SET);
1210         write (fd, current_dir_block, metadata.count);
1211         free (current_dir_block);
1212     }
1213
1214     /* this actually serves to pad out the cache file, if needed */
1215     if (ftruncate (fd, current_arch_start + truncate_to) == -1)
1216         goto bail5;
1217
1218     free (header);
1219     close(fd);
1220     if (!FcAtomicReplaceOrig(atomic))
1221         goto bail5;
1222     FcStrFree ((FcChar8 *)cache_hashed);
1223     FcStrFree ((FcChar8 *)cache_file);
1224     FcAtomicUnlock (atomic);
1225     FcAtomicDestroy (atomic);
1226     return FcTrue;
1227
1228  bail5:
1229     free (header);
1230  bail4:
1231     close (fd);
1232  bail3:
1233     FcAtomicUnlock (atomic);
1234  bail2:
1235     FcAtomicDestroy (atomic);
1236  bail1:
1237     FcStrFree ((FcChar8 *)cache_hashed);
1238  bail0:
1239     unlink ((char *)cache_file);
1240     FcStrFree ((FcChar8 *)cache_file);
1241     if (current_dir_block)
1242         free (current_dir_block);
1243  bail:
1244     return FcFalse;
1245 }
1246
1247 static char *
1248 FcCacheMachineSignature ()
1249 {
1250     static char buf[MACHINE_SIGNATURE_SIZE];
1251     int32_t magic = ENDIAN_TEST;
1252     char * m = (char *)&magic;
1253
1254     sprintf (buf, "%2x%2x%2x%2x "
1255              "%4x %4x %4x %4x %4x %4x %4x %4x %4x %4x %4x %4x "
1256              "%4x %4x %4x %4x %4x %4x %4x %4x\n",
1257              m[0], m[1], m[2], m[3],
1258              (unsigned int)sizeof (char),
1259              (unsigned int)sizeof (char *),
1260              (unsigned int)sizeof (int),
1261              (unsigned int)sizeof (FcPattern),
1262              (unsigned int)sizeof (FcPatternEltPtr),
1263              (unsigned int)sizeof (struct _FcPatternElt *),
1264              (unsigned int)sizeof (FcPatternElt),
1265              (unsigned int)sizeof (FcObjectPtr),
1266              (unsigned int)sizeof (FcValueListPtr),
1267              (unsigned int)sizeof (FcValue),
1268              (unsigned int)sizeof (FcValueBinding),
1269              (unsigned int)sizeof (struct _FcValueList *),
1270              (unsigned int)sizeof (FcCharSet),
1271              (unsigned int)sizeof (FcCharLeaf **),
1272              (unsigned int)sizeof (FcChar16 *),
1273              (unsigned int)sizeof (FcChar16),
1274              (unsigned int)sizeof (FcCharLeaf),
1275              (unsigned int)sizeof (FcChar32),
1276              (unsigned int)sizeof (FcCache),
1277              (unsigned int)sysconf(_SC_PAGESIZE));
1278
1279     return buf;
1280 }
1281
1282 static int banks_ptr = 0, banks_alloc = 0;
1283 int * _fcBankId = 0, * _fcBankIdx = 0;
1284 static const char ** bankDirs = 0;
1285
1286 static FcBool
1287 FcCacheHaveBank (int bank)
1288 {
1289     int i;
1290
1291     if (bank < FC_BANK_FIRST)
1292         return FcTrue;
1293
1294     for (i = 0; i < banks_ptr; i++)
1295         if (_fcBankId[i] == bank)
1296             return FcTrue;
1297
1298     return FcFalse;
1299 }
1300
1301 int
1302 FcCacheBankToIndexMTF (int bank)
1303 {
1304     int i, j;
1305
1306     for (i = 0; i < banks_ptr; i++)
1307         if (_fcBankId[_fcBankIdx[i]] == bank)
1308         {
1309             int t = _fcBankIdx[i];
1310
1311             for (j = i; j > 0; j--)
1312                 _fcBankIdx[j] = _fcBankIdx[j-1];
1313             _fcBankIdx[0] = t;
1314             return t;
1315         }
1316
1317     if (banks_ptr >= banks_alloc)
1318     {
1319         int * b, * bidx;
1320         const char ** bds;
1321
1322         b = realloc (_fcBankId, (banks_alloc + 4) * sizeof(int));
1323         if (!b)
1324             return -1;
1325         _fcBankId = b;
1326
1327         bidx = realloc (_fcBankIdx, (banks_alloc + 4) * sizeof(int));
1328         if (!bidx)
1329             return -1;
1330         _fcBankIdx = bidx;
1331
1332         bds = realloc (bankDirs, (banks_alloc + 4) * sizeof (char *));
1333         if (!bds)
1334             return -1;
1335         bankDirs = bds;
1336
1337         banks_alloc += 4;
1338     }
1339
1340     i = banks_ptr++;
1341     _fcBankId[i] = bank;
1342     _fcBankIdx[i] = i;
1343     return i;
1344 }
1345
1346 static void
1347 FcCacheAddBankDir (int bank, const char * dir)
1348 {
1349     int bi = FcCacheBankToIndexMTF (bank);
1350
1351     if (bi < 0)
1352         return;
1353
1354     bankDirs[bi] = (const char *)FcStrCopy ((FcChar8 *)dir);
1355 }
1356
1357 const char *
1358 FcCacheFindBankDir (int bank)
1359 {
1360     int bi = FcCacheBankToIndex (bank);
1361     return bankDirs[bi];
1362 }
1363
1364 /*
1365  * This code implements the MD5 message-digest algorithm.
1366  * The algorithm is due to Ron Rivest.  This code was
1367  * written by Colin Plumb in 1993, no copyright is claimed.
1368  * This code is in the public domain; do with it what you wish.
1369  *
1370  * Equivalent code is available from RSA Data Security, Inc.
1371  * This code has been tested against that, and is equivalent,
1372  * except that you don't need to include two pages of legalese
1373  * with every copy.
1374  *
1375  * To compute the message digest of a chunk of bytes, declare an
1376  * MD5Context structure, pass it to MD5Init, call MD5Update as
1377  * needed on buffers full of bytes, and then call MD5Final, which
1378  * will fill a supplied 16-byte array with the digest.
1379  */
1380
1381 #ifndef HIGHFIRST
1382 #define byteReverse(buf, len)   /* Nothing */
1383 #else
1384 /*
1385  * Note: this code is harmless on little-endian machines.
1386  */
1387 void byteReverse(unsigned char *buf, unsigned longs)
1388 {
1389     FcChar32 t;
1390     do {
1391         t = (FcChar32) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
1392             ((unsigned) buf[1] << 8 | buf[0]);
1393         *(FcChar32 *) buf = t;
1394         buf += 4;
1395     } while (--longs);
1396 }
1397 #endif
1398
1399 /*
1400  * Start MD5 accumulation.  Set bit count to 0 and buffer to mysterious
1401  * initialization constants.
1402  */
1403 static void MD5Init(struct MD5Context *ctx)
1404 {
1405     ctx->buf[0] = 0x67452301;
1406     ctx->buf[1] = 0xefcdab89;
1407     ctx->buf[2] = 0x98badcfe;
1408     ctx->buf[3] = 0x10325476;
1409
1410     ctx->bits[0] = 0;
1411     ctx->bits[1] = 0;
1412 }
1413
1414 /*
1415  * Update context to reflect the concatenation of another buffer full
1416  * of bytes.
1417  */
1418 static void MD5Update(struct MD5Context *ctx, unsigned char *buf, unsigned len)
1419 {
1420     FcChar32 t;
1421
1422     /* Update bitcount */
1423
1424     t = ctx->bits[0];
1425     if ((ctx->bits[0] = t + ((FcChar32) len << 3)) < t)
1426         ctx->bits[1]++;         /* Carry from low to high */
1427     ctx->bits[1] += len >> 29;
1428
1429     t = (t >> 3) & 0x3f;        /* Bytes already in shsInfo->data */
1430
1431     /* Handle any leading odd-sized chunks */
1432
1433     if (t) {
1434         unsigned char *p = (unsigned char *) ctx->in + t;
1435
1436         t = 64 - t;
1437         if (len < t) {
1438             memcpy(p, buf, len);
1439             return;
1440         }
1441         memcpy(p, buf, t);
1442         byteReverse(ctx->in, 16);
1443         MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
1444         buf += t;
1445         len -= t;
1446     }
1447     /* Process data in 64-byte chunks */
1448
1449     while (len >= 64) {
1450         memcpy(ctx->in, buf, 64);
1451         byteReverse(ctx->in, 16);
1452         MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
1453         buf += 64;
1454         len -= 64;
1455     }
1456
1457     /* Handle any remaining bytes of data. */
1458
1459     memcpy(ctx->in, buf, len);
1460 }
1461
1462 /*
1463  * Final wrapup - pad to 64-byte boundary with the bit pattern
1464  * 1 0* (64-bit count of bits processed, MSB-first)
1465  */
1466 static void MD5Final(unsigned char digest[16], struct MD5Context *ctx)
1467 {
1468     unsigned count;
1469     unsigned char *p;
1470
1471     /* Compute number of bytes mod 64 */
1472     count = (ctx->bits[0] >> 3) & 0x3F;
1473
1474     /* Set the first char of padding to 0x80.  This is safe since there is
1475        always at least one byte free */
1476     p = ctx->in + count;
1477     *p++ = 0x80;
1478
1479     /* Bytes of padding needed to make 64 bytes */
1480     count = 64 - 1 - count;
1481
1482     /* Pad out to 56 mod 64 */
1483     if (count < 8) {
1484         /* Two lots of padding:  Pad the first block to 64 bytes */
1485         memset(p, 0, count);
1486         byteReverse(ctx->in, 16);
1487         MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
1488
1489         /* Now fill the next block with 56 bytes */
1490         memset(ctx->in, 0, 56);
1491     } else {
1492         /* Pad block to 56 bytes */
1493         memset(p, 0, count - 8);
1494     }
1495     byteReverse(ctx->in, 14);
1496
1497     /* Append length in bits and transform */
1498     ((FcChar32 *) ctx->in)[14] = ctx->bits[0];
1499     ((FcChar32 *) ctx->in)[15] = ctx->bits[1];
1500
1501     MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
1502     byteReverse((unsigned char *) ctx->buf, 4);
1503     memcpy(digest, ctx->buf, 16);
1504     memset(ctx, 0, sizeof(ctx));        /* In case it's sensitive */
1505 }
1506
1507
1508 /* The four core functions - F1 is optimized somewhat */
1509
1510 /* #define F1(x, y, z) (x & y | ~x & z) */
1511 #define F1(x, y, z) (z ^ (x & (y ^ z)))
1512 #define F2(x, y, z) F1(z, x, y)
1513 #define F3(x, y, z) (x ^ y ^ z)
1514 #define F4(x, y, z) (y ^ (x | ~z))
1515
1516 /* This is the central step in the MD5 algorithm. */
1517 #define MD5STEP(f, w, x, y, z, data, s) \
1518         ( w += f(x, y, z) + data,  w = w<<s | w>>(32-s),  w += x )
1519
1520 /*
1521  * The core of the MD5 algorithm, this alters an existing MD5 hash to
1522  * reflect the addition of 16 longwords of new data.  MD5Update blocks
1523  * the data and converts bytes into longwords for this routine.
1524  */
1525 static void MD5Transform(FcChar32 buf[4], FcChar32 in[16])
1526 {
1527     register FcChar32 a, b, c, d;
1528
1529     a = buf[0];
1530     b = buf[1];
1531     c = buf[2];
1532     d = buf[3];
1533
1534     MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
1535     MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
1536     MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
1537     MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
1538     MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
1539     MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
1540     MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
1541     MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
1542     MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
1543     MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
1544     MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
1545     MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
1546     MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
1547     MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
1548     MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
1549     MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
1550
1551     MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
1552     MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
1553     MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
1554     MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
1555     MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
1556     MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
1557     MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
1558     MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
1559     MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
1560     MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
1561     MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
1562     MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
1563     MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
1564     MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
1565     MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
1566     MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
1567
1568     MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
1569     MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
1570     MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
1571     MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
1572     MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
1573     MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
1574     MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
1575     MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
1576     MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
1577     MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
1578     MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
1579     MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
1580     MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
1581     MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
1582     MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
1583     MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
1584
1585     MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
1586     MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
1587     MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
1588     MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
1589     MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
1590     MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
1591     MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
1592     MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
1593     MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
1594     MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
1595     MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
1596     MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
1597     MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
1598     MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
1599     MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
1600     MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
1601
1602     buf[0] += a;
1603     buf[1] += b;
1604     buf[2] += c;
1605     buf[3] += d;
1606 }