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