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