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);
  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     FcCacheReadString (cache->fd, name_buf, sizeof (name_buf));
 223     if (strcmp (name_buf, FC_GLOBAL_MAGIC_COOKIE) != 0)
 224         return;
 225
 226     current_arch_machine_name = FcCacheMachineSignature ();
 227     current_arch_start = FcCacheSkipToArch(cache->fd,
 228                                            current_arch_machine_name);
 229     if (current_arch_start < 0)
 230         goto bail_and_destroy;
 231
 232     lseek (cache->fd, current_arch_start, SEEK_SET);
 233     FcCacheReadString (cache->fd, candidate_arch_machine_name,
 234                        sizeof (candidate_arch_machine_name));
 235     if (strlen(candidate_arch_machine_name) == 0)
 236         goto bail_and_destroy;
 237
 238     while (1)
 239     {
 240         off_t targ;
 241
 242         FcCacheReadString (cache->fd, name_buf, sizeof (name_buf));
 243         if (!strlen(name_buf))
 244             break;
 245
 246         /* Directory must be older than the global cache file; also
 247            cache must be newer than the config file. */
 248         if (stat ((char *) name_buf, &dir_stat) < 0 ||
 249             dir_stat.st_mtime > cache_stat.st_mtime ||
 250             (config_time.set && cache_stat.st_mtime < config_time.time))
 251         {
 252             FcCache md;
 253
 254             FcStrSetAdd (staleDirs, FcStrCopy ((FcChar8 *)name_buf));
 255             read (cache->fd, &md, sizeof (FcCache));
 256             lseek (cache->fd, FcCacheNextOffset (lseek(cache->fd, 0, SEEK_CUR)) + md.count, SEEK_SET);
 257             continue;
 258         }
 259
 260         d = malloc (sizeof (FcGlobalCacheDir));
 261         if (!d)
 262             goto bail1;
 263
 264         d->next = cache->dirs;
 265         cache->dirs = d;
 266
 267         d->name = (char *)FcStrCopy ((FcChar8 *)name_buf);
 268         d->ent = 0;
 269         d->offset = lseek (cache->fd, 0, SEEK_CUR);
 270         if (read (cache->fd, &d->metadata, sizeof (FcCache)) != sizeof (FcCache))
 271             goto bail1;
 272         targ = FcCacheNextOffset (lseek(cache->fd, 0, SEEK_CUR)) + d->metadata.count;
 273         if (lseek (cache->fd, targ, SEEK_SET) != targ)
 274             goto bail1;
 275     }
 276     return;
 277
 278  bail1:
 279     for (d = cache->dirs; d; d = next)
 280     {
 281         next = d->next;
 282         free (d);
 283     }
 284     cache->dirs = 0;
 285
 286     close (cache->fd);
 287     cache->fd = -1;
 288     return;
 289
 290  bail_and_destroy:
 291     close (cache->fd);
 292     cache->fd = -1;
 293
 294     if (stat ((char *) cache_file, &cache_stat) == 0)
 295         unlink ((char *)cache_file);
 296
 297     return;
 298
 299 }
 300
 301 FcBool
 302 FcGlobalCacheReadDir (FcFontSet *set, FcStrSet *dirs, FcGlobalCache * cache, const char *dir, FcConfig *config)
 303 {
 304     FcGlobalCacheDir *d;
 305     FcBool ret = FcFalse;
 306
 307     if (cache->fd == -1)
 308         return FcFalse;
 309
 310     for (d = cache->dirs; d; d = d->next)
 311     {
 312         if (strncmp (d->name, dir, strlen(dir)) == 0)
 313         {
 314             lseek (cache->fd, d->offset, SEEK_SET);
 315             if (!FcDirCacheConsume (cache->fd, dir, set))
 316                 return FcFalse;
 317             if (strcmp (d->name, dir) == 0)
 318                 ret = FcTrue;
 319         }
 320     }
 321
 322     return ret;
 323 }
 324
 325 FcBool
 326 FcGlobalCacheUpdate (FcGlobalCache  *cache,
 327                      const char     *name,
 328                      FcFontSet      *set)
 329 {
 330     FcGlobalCacheDir * d;
 331
 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 {
 359     int                 fd, fd_orig;
 360     FcGlobalCacheDir    *dir;
 361     FcAtomic            *atomic;
 362     off_t               current_arch_start = 0, truncate_to;
 363     char                * current_arch_machine_name, * header;
 364
 365     if (!cache->updated)
 366         return FcTrue;
 367
 368 #if defined (HAVE_GETUID) && defined (HAVE_GETEUID)
 369     /* Set-UID programs can't safely update the cache */
 370     if (getuid () != geteuid ())
 371         return FcFalse;
 372 #endif
 373
 374     atomic = FcAtomicCreate (cache_file);
 375     if (!atomic)
 376         return FcFalse;
 377
 378     if (!FcAtomicLock (atomic))
 379         goto bail1;
 380     fd = open ((char *) FcAtomicNewFile(atomic), O_RDWR | O_CREAT,
 381                S_IRUSR | S_IWUSR);
 382     if (fd == -1)
 383         goto bail2;
 384
 385     fd_orig = open ((char *) FcAtomicOrigFile(atomic), O_RDONLY);
 386
 387     current_arch_machine_name = FcCacheMachineSignature ();
 388     if (fd_orig == -1)
 389         current_arch_start = 0;
 390     else
 391         current_arch_start = FcCacheSkipToArch (fd_orig,
 392                                                 current_arch_machine_name);
 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     FcCacheWriteString (fd, FC_GLOBAL_MAGIC_COOKIE);
 422     sprintf (header, "%8x ", (int)truncate_to);
 423     strcat (header, current_arch_machine_name);
 424     if (!FcCacheWriteString (fd, header))
 425         goto bail4;
 426
 427     for (dir = cache->dirs; dir; dir = dir->next)
 428     {
 429         if (dir->name)
 430         {
 431             FcCacheWriteString (fd, dir->name);
 432             write (fd, &dir->metadata, sizeof(FcCache));
 433             lseek (fd, FcCacheNextOffset (lseek(fd, 0, SEEK_CUR)), SEEK_SET);
 434             write (fd, dir->ent, dir->metadata.count);
 435             free (dir->ent);
 436         }
 437     }
 438     FcCacheWriteString (fd, "");
 439
 440     if (close (fd) == -1)
 441         goto bail25;
 442
 443     if (!FcAtomicReplaceOrig (atomic))
 444         goto bail25;
 445
 446     FcAtomicUnlock (atomic);
 447     FcAtomicDestroy (atomic);
 448
 449     cache->updated = FcFalse;
 450     return FcTrue;
 451
 452  bail4:
 453     free (header);
 454  bail3:
 455     if (fd_orig != -1)
 456         close (fd_orig);
 457
 458     close (fd);
 459  bail25:
 460     FcAtomicDeleteNew (atomic);
 461  bail2:
 462     FcAtomicUnlock (atomic);
 463  bail1:
 464     FcAtomicDestroy (atomic);
 465     return FcFalse;
 466 }
 467
 468 /*
 469  * Find the next presumably-mmapable offset after the supplied file
 470  * position.
 471  */
 472 static int
 473 FcCacheNextOffset(off_t w)
 474 {
 475     static long pagesize = -1;
 476     if (pagesize == -1)
 477         pagesize = sysconf(_SC_PAGESIZE);
 478     if (w % pagesize == 0)
 479         return w;
 480     else
 481         return ((w / pagesize)+1)*pagesize;
 482 }
 483
 484 /* return the address of the segment for the provided arch,
 485  * or -1 if arch not found */
 486 static off_t
 487 FcCacheSkipToArch (int fd, const char * arch)
 488 {
 489     char candidate_arch_machine_name_count[MACHINE_SIGNATURE_SIZE + 9];
 490     char * candidate_arch;
 491     off_t current_arch_start = 0;
 492
 493     lseek (fd, 0, SEEK_SET);
 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, current_arch_machine_name);
 656     close (fd);
 657
 658     if (current_arch_start < 0)
 659         return FcFalse;
 660
 661     return FcTrue;
 662
 663  bail:
 664     free (cache_file);
 665     return FcFalse;
 666 }
 667
 668 FcBool
 669 FcDirCacheUnlink (const FcChar8 *dir)
 670 {
 671     char        *cache_file = (char *)FcStrPlus (dir, (FcChar8 *) "/" FC_DIR_CACHE_FILE);
 672     char        *cache_hashed;
 673     int         fd, collisions;
 674     struct stat cache_stat;
 675     char        name_buf[FC_MAX_FILE_LEN];
 676
 677     /* First remove normal cache file. */
 678     if (stat ((char *) cache_file, &cache_stat) == 0 &&
 679         unlink ((char *)cache_file) != 0)
 680         goto bail;
 681
 682     /* Next remove any applicable hashed files. */
 683     fd = -1; collisions = 0;
 684     do
 685     {
 686         cache_hashed = FcDirCacheHashName (cache_file, collisions++);
 687         if (!cache_hashed)
 688             goto bail;
 689
 690         if (fd > 0)
 691             close (fd);
 692         fd = open(cache_hashed, O_RDONLY);
 693         if (fd == -1)
 694         {
 695             FcStrFree ((FcChar8 *)cache_file);
 696             return FcTrue;
 697         }
 698
 699         FcCacheReadString (fd, name_buf, sizeof (name_buf));
 700         if (!strlen(name_buf))
 701             goto bail;
 702     } while (strcmp (name_buf, cache_file) != 0);
 703
 704     FcStrFree ((FcChar8 *)cache_file);
 705     close (fd);
 706
 707     if (stat ((char *) cache_hashed, &cache_stat) == 0 &&
 708         unlink ((char *)cache_hashed) != 0)
 709     {
 710         FcStrFree ((FcChar8 *)cache_hashed);
 711         goto bail;
 712     }
 713
 714     FcStrFree ((FcChar8 *)cache_hashed);
 715     return FcTrue;
 716
 717  bail:
 718     FcStrFree ((FcChar8 *)cache_file);
 719     return FcFalse;
 720 }
 721
 722 static int
 723 FcCacheReadDirs (FcConfig * config, FcGlobalCache * cache,
 724                  FcStrList *list, FcFontSet * set)
 725 {
 726     int                 ret = 0;
 727     FcChar8             *dir;
 728     FcChar8             *file, *base;
 729     FcStrSet            *subdirs;
 730     FcStrList           *sublist;
 731     struct stat         statb;
 732
 733     /*
 734      * Read in the results from 'list'.
 735      */
 736     while ((dir = FcStrListNext (list)))
 737     {
 738         if (!FcConfigAcceptFilename (config, dir))
 739             continue;
 740
 741         /* freed below */
 742         file = (FcChar8 *) malloc (strlen ((char *) dir) + 1 + FC_MAX_FILE_LEN + 1);
 743         if (!file)
 744             return FcFalse;
 745
 746         strcpy ((char *) file, (char *) dir);
 747         strcat ((char *) file, "/");
 748         base = file + strlen ((char *) file);
 749
 750         subdirs = FcStrSetCreate ();
 751         if (!subdirs)
 752         {
 753             fprintf (stderr, "Can't create directory set\n");
 754             ret++;
 755             free (file);
 756             continue;
 757         }
 758
 759         if (access ((char *) dir, X_OK) < 0)
 760         {
 761             switch (errno) {
 762             case ENOENT:
 763             case ENOTDIR:
 764             case EACCES:
 765                 break;
 766             default:
 767                 fprintf (stderr, "\"%s\": ", dir);
 768                 perror ("");
 769                 ret++;
 770             }
 771             FcStrSetDestroy (subdirs);
 772             free (file);
 773             continue;
 774         }
 775         if (stat ((char *) dir, &statb) == -1)
 776         {
 777             fprintf (stderr, "\"%s\": ", dir);
 778             perror ("");
 779             FcStrSetDestroy (subdirs);
 780             ret++;
 781             free (file);
 782             continue;
 783         }
 784         if (!S_ISDIR (statb.st_mode))
 785         {
 786             fprintf (stderr, "\"%s\": not a directory, skipping\n", dir);
 787             FcStrSetDestroy (subdirs);
 788             free (file);
 789             continue;
 790         }
 791         if (!FcDirCacheValid (dir) || !FcDirCacheRead (set, subdirs, dir))
 792         {
 793             if (FcDebug () & FC_DBG_FONTSET)
 794                 printf ("cache scan dir %s\n", dir);
 795
 796             FcDirScanConfig (set, subdirs, cache,
 797                              config->blanks, dir, FcFalse, config);
 798         }
 799         sublist = FcStrListCreate (subdirs);
 800         FcStrSetDestroy (subdirs);
 801         if (!sublist)
 802         {
 803             fprintf (stderr, "Can't create subdir list in \"%s\"\n", dir);
 804             ret++;
 805             free (file);
 806             continue;
 807         }
 808         ret += FcCacheReadDirs (config, cache, sublist, set);
 809         free (file);
 810     }
 811     FcStrListDone (list);
 812     return ret;
 813 }
 814
 815 FcFontSet *
 816 FcCacheRead (FcConfig *config, FcGlobalCache * cache)
 817 {
 818     FcFontSet * s = FcFontSetCreate();
 819     if (!s)
 820         return 0;
 821
 822     if (FcCacheReadDirs (config, cache, FcConfigGetConfigDirs (config), s))
 823         goto bail;
 824
 825     return s;
 826
 827  bail:
 828     FcFontSetDestroy (s);
 829     return 0;
 830 }
 831
 832 static const char bin2hex[] = { '0', '1', '2', '3',
 833                                 '4', '5', '6', '7',
 834                                 '8', '9', 'a', 'b',
 835                                 'c', 'd', 'e', 'f' };
 836
 837 static char *
 838 FcDirCacheHashName (char * cache_file, int collisions)
 839 {
 840     unsigned char       hash[16], hex_hash[33];
 841     char                *cache_hashed;
 842     unsigned char       uscore = '_';
 843     int                 cnt, i;
 844     FcChar8             *tmp;
 845     struct MD5Context   ctx;
 846
 847     MD5Init (&ctx);
 848     MD5Update (&ctx, (unsigned char *)cache_file, strlen (cache_file));
 849
 850     for (i = 0; i < collisions; i++)
 851         MD5Update (&ctx, &uscore, 1);
 852
 853     MD5Final (hash, &ctx);
 854
 855     for (cnt = 0; cnt < 16; ++cnt)
 856     {
 857         hex_hash[2*cnt] = bin2hex[hash[cnt] >> 4];
 858         hex_hash[2*cnt+1] = bin2hex[hash[cnt] & 0xf];
 859     }
 860     hex_hash[32] = 0;
 861
 862     tmp = FcStrPlus ((FcChar8 *)hex_hash, (FcChar8 *)FC_CACHE_SUFFIX);
 863     if (!tmp)
 864         return 0;
 865
 866     cache_hashed = (char *)FcStrPlus ((FcChar8 *)PKGCACHEDIR"/", tmp);
 867     free (tmp);
 868
 869     return cache_hashed;
 870 }
 871
 872 /* Opens the hashed name for cache_file.
 873  * This would fail in the unlikely event of a collision and subsequent
 874  * removal of the file which originally caused the collision. */
 875 static int
 876 FcDirCacheOpen (char *cache_file)
 877 {
 878     int         fd = -1, collisions = 0;
 879     char        *cache_hashed;
 880     char        name_buf[FC_MAX_FILE_LEN];
 881
 882     fd = open(cache_file, O_RDONLY);
 883     if (fd != -1)
 884         return fd;
 885
 886     do
 887     {
 888         cache_hashed = FcDirCacheHashName (cache_file, collisions++);
 889         if (!cache_hashed)
 890             return -1;
 891
 892         if (fd > 0)
 893             close (fd);
 894         fd = open(cache_hashed, O_RDONLY);
 895         FcStrFree ((FcChar8 *)cache_hashed);
 896
 897         if (fd == -1)
 898             return -1;
 899         FcCacheReadString (fd, name_buf, sizeof (name_buf));
 900         if (!strlen(name_buf))
 901             goto bail;
 902     } while (strcmp (name_buf, cache_file) != 0);
 903     return fd;
 904
 905  bail:
 906     close (fd);
 907     return -1;
 908 }
 909
 910 /* read serialized state from the cache file */
 911 FcBool
 912 FcDirCacheRead (FcFontSet * set, FcStrSet * dirs, const FcChar8 *dir)
 913 {
 914     char        *cache_file;
 915     int         fd;
 916     char        *current_arch_machine_name;
 917     char        candidate_arch_machine_name[9+MACHINE_SIGNATURE_SIZE];
 918     off_t       current_arch_start = 0;
 919     char        subdirName[FC_MAX_FILE_LEN + 1 + 12 + 1];
 920
 921     cache_file = (char *)FcStrPlus (dir, (FcChar8 *) "/" FC_DIR_CACHE_FILE);
 922     if (!cache_file)
 923         return FcFalse;
 924
 925     fd = FcDirCacheOpen (cache_file);
 926     if (fd < 0)
 927         goto bail;
 928
 929     current_arch_machine_name = FcCacheMachineSignature();
 930     current_arch_start = FcCacheSkipToArch(fd,
 931                                            current_arch_machine_name);
 932     if (current_arch_start < 0)
 933         goto bail1;
 934
 935     lseek (fd, current_arch_start, SEEK_SET);
 936     if (FcCacheReadString (fd, candidate_arch_machine_name,
 937                            sizeof (candidate_arch_machine_name)) == 0)
 938         goto bail1;
 939
 940     while (strlen(FcCacheReadString (fd, subdirName, sizeof (subdirName))) > 0)
 941         FcStrSetAdd (dirs, (FcChar8 *)subdirName);
 942
 943     if (!FcDirCacheConsume (fd, (const char *)dir, set))
 944         goto bail1;
 945
 946     close(fd);
 947     free (cache_file);
 948     return FcTrue;
 949
 950  bail1:
 951     close (fd);
 952  bail:
 953     free (cache_file);
 954     return FcFalse;
 955 }
 956
 957 static FcBool
 958 FcDirCacheConsume (int fd, const char * dir, FcFontSet *set)
 959 {
 960     FcCache metadata;
 961     void * current_dir_block;
 962     off_t pos;
 963
 964     read(fd, &metadata, sizeof(FcCache));
 965     if (metadata.magic != FC_CACHE_MAGIC)
 966         return FcFalse;
 967
 968     if (!metadata.count)
 969     {
 970         pos = FcCacheNextOffset (lseek(fd, 0, SEEK_CUR));
 971         lseek (fd, pos, SEEK_SET);
 972         return FcTrue;
 973     }
 974
 975     pos = FcCacheNextOffset (lseek(fd, 0, SEEK_CUR));
 976     current_dir_block = mmap (0, metadata.count,
 977                               PROT_READ, MAP_SHARED, fd, pos);
 978     lseek (fd, pos+metadata.count, SEEK_SET);
 979     if (current_dir_block == MAP_FAILED)
 980         return FcFalse;
 981
 982     FcCacheAddBankDir (metadata.bank, dir);
 983
 984     if (!FcFontSetUnserialize (&metadata, set, current_dir_block))
 985         return FcFalse;
 986
 987     return FcTrue;
 988 }
 989
 990 static void *
 991 FcDirCacheProduce (FcFontSet *set, FcCache *metadata)
 992 {
 993     void * current_dir_block, * final_dir_block;
 994     static unsigned int rand_state = 0;
 995     int bank, needed_bytes_no_align;
 996
 997     if (!rand_state)
 998         rand_state = time(0L);
 999     bank = rand_r(&rand_state);
1000
1001     while (FcCacheHaveBank(bank))
1002         bank = rand_r(&rand_state);
1003
1004     memset (metadata, 0, sizeof(FcCache));
1005     FcFontSetNewBank();
1006     needed_bytes_no_align = FcFontSetNeededBytes (set);
1007     metadata->count = needed_bytes_no_align +
1008         FcFontSetNeededBytesAlign ();
1009     metadata->magic = FC_CACHE_MAGIC;
1010     metadata->bank = bank;
1011
1012     if (!needed_bytes_no_align) /* not a failure, no fonts to write */
1013     {
1014         /* no, you don't really need to write any bytes at all. */
1015         metadata->count = 0;
1016         return 0;
1017     }
1018
1019     current_dir_block = malloc (metadata->count);
1020     if (!current_dir_block)
1021         goto bail;
1022     // shut up valgrind
1023     memset (current_dir_block, 0, metadata->count);
1024     final_dir_block = FcFontSetDistributeBytes (metadata, current_dir_block);
1025
1026     if ((void *)((char *)current_dir_block+metadata->count) < final_dir_block)
1027         goto bail;
1028
1029     if (!FcFontSetSerialize (bank, set))
1030         goto bail;
1031
1032     return current_dir_block;
1033
1034  bail:
1035     free (current_dir_block);
1036     return 0;
1037 }
1038
1039 /* write serialized state to the cache file */
1040 FcBool
1041 FcDirCacheWrite (FcFontSet *set, FcStrSet *dirs, const FcChar8 *dir)
1042 {
1043     char            *cache_file;
1044     char            *cache_hashed;
1045     int             fd, fd_orig, i, dirs_count;
1046     FcAtomic        *atomic;
1047     FcCache         metadata;
1048     off_t           current_arch_start = 0, truncate_to;
1049     char            name_buf[FC_MAX_FILE_LEN];
1050     int             collisions;
1051
1052     char            *current_arch_machine_name, * header;
1053     void            *current_dir_block = 0;
1054
1055     cache_file = (char *)FcStrPlus (dir, (FcChar8 *) "/" FC_DIR_CACHE_FILE);
1056     if (!cache_file)
1057         goto bail;
1058
1059     /* Ensure that we're not trampling a cache for some other dir. */
1060     /* This is slightly different from FcDirCacheOpen, since it
1061      * needs the filename, not the file descriptor. */
1062     fd = -1; collisions = 0;
1063     do
1064     {
1065         cache_hashed = FcDirCacheHashName (cache_file, collisions++);
1066         if (!cache_hashed)
1067             goto bail0;
1068
1069         if (fd > 0)
1070             close (fd);
1071         fd = open(cache_hashed, O_RDONLY);
1072         if (fd == -1)
1073             break;
1074         FcCacheReadString (fd, name_buf, sizeof (name_buf));
1075         close (fd);
1076
1077         if (!strlen(name_buf))
1078             break;
1079
1080         if (strcmp (name_buf, cache_file) != 0)
1081             continue;
1082     } while (0);
1083
1084     current_dir_block = FcDirCacheProduce (set, &metadata);
1085
1086     if (metadata.count && !current_dir_block)
1087         goto bail1;
1088
1089     if (FcDebug () & FC_DBG_CACHE)
1090         printf ("FcDirCacheWriteDir cache_file \"%s\"\n", cache_file);
1091
1092     atomic = FcAtomicCreate ((FcChar8 *)cache_hashed);
1093     if (!atomic)
1094         goto bail1;
1095
1096     if (!FcAtomicLock (atomic))
1097     {
1098         /* Now try rewriting the original version of the file. */
1099         FcAtomicDestroy (atomic);
1100
1101         atomic = FcAtomicCreate ((FcChar8 *)cache_file);
1102         fd_orig = open (cache_file, O_RDONLY);
1103         if (fd_orig == -1)
1104             fd_orig = open((char *)FcAtomicOrigFile (atomic), O_RDONLY);
1105
1106         fd = open((char *)FcAtomicNewFile (atomic), O_RDWR | O_CREAT, 0666);
1107         if (fd == -1)
1108             goto bail2;
1109     }
1110
1111     /* In all cases, try opening the real location of the cache file first. */
1112     /* (even if that's not atomic.) */
1113     fd_orig = open (cache_file, O_RDONLY);
1114     if (fd_orig == -1)
1115         fd_orig = open((char *)FcAtomicOrigFile (atomic), O_RDONLY);
1116
1117     fd = open((char *)FcAtomicNewFile (atomic), O_RDWR | O_CREAT, 0666);
1118     if (fd == -1)
1119         goto bail3;
1120
1121     FcCacheWriteString (fd, cache_file);
1122
1123     current_arch_machine_name = FcCacheMachineSignature ();
1124     current_arch_start = 0;
1125
1126     if (fd_orig != -1)
1127         current_arch_start =
1128             FcCacheSkipToArch(fd_orig, current_arch_machine_name);
1129
1130     if (current_arch_start < 0)
1131         current_arch_start = FcCacheNextOffset (lseek(fd_orig, 0, SEEK_END));
1132
1133     if (fd_orig != -1 && !FcCacheCopyOld(fd, fd_orig, current_arch_start))
1134         goto bail4;
1135
1136     if (fd_orig != -1)
1137         close (fd_orig);
1138
1139     current_arch_start = lseek(fd, 0, SEEK_CUR);
1140     if (ftruncate (fd, current_arch_start) == -1)
1141         goto bail4;
1142
1143     /* allocate space for subdir names in this block */
1144     dirs_count = 0;
1145     for (i = 0; i < dirs->size; i++)
1146         dirs_count += strlen((char *)dirs->strs[i]) + 1;
1147     dirs_count ++;
1148
1149     /* now write the address of the next offset */
1150     truncate_to = FcCacheNextOffset (FcCacheNextOffset (current_arch_start + sizeof (FcCache) + dirs_count) + metadata.count) - current_arch_start;
1151     header = malloc (10 + strlen (current_arch_machine_name));
1152     if (!header)
1153         goto bail4;
1154     sprintf (header, "%8x ", (int)truncate_to);
1155     strcat (header, current_arch_machine_name);
1156     if (!FcCacheWriteString (fd, header))
1157         goto bail5;
1158
1159     for (i = 0; i < dirs->size; i++)
1160         FcCacheWriteString (fd, (char *)dirs->strs[i]);
1161     FcCacheWriteString (fd, "");
1162
1163     write (fd, &metadata, sizeof(FcCache));
1164     if (metadata.count)
1165     {
1166         lseek (fd, FcCacheNextOffset (lseek(fd, 0, SEEK_END)), SEEK_SET);
1167         write (fd, current_dir_block, metadata.count);
1168         free (current_dir_block);
1169     }
1170
1171     /* this actually serves to pad out the cache file, if needed */
1172     if (ftruncate (fd, current_arch_start + truncate_to) == -1)
1173         goto bail5;
1174
1175     close(fd);
1176     if (!FcAtomicReplaceOrig(atomic))
1177         goto bail5;
1178     FcStrFree ((FcChar8 *)cache_hashed);
1179     FcAtomicUnlock (atomic);
1180     FcAtomicDestroy (atomic);
1181     return FcTrue;
1182
1183  bail5:
1184     free (header);
1185  bail4:
1186     close (fd);
1187  bail3:
1188     FcAtomicUnlock (atomic);
1189  bail2:
1190     FcAtomicDestroy (atomic);
1191  bail1:
1192     FcStrFree ((FcChar8 *)cache_hashed);
1193  bail0:
1194     unlink ((char *)cache_file);
1195     free (cache_file);
1196     if (current_dir_block)
1197         free (current_dir_block);
1198  bail:
1199     return FcFalse;
1200 }
1201
1202 static char *
1203 FcCacheMachineSignature ()
1204 {
1205     static char buf[MACHINE_SIGNATURE_SIZE];
1206     int32_t magic = ENDIAN_TEST;
1207     char * m = (char *)&magic;
1208
1209     sprintf (buf, "%2x%2x%2x%2x "
1210              "%4x %4x %4x %4x %4x %4x %4x %4x %4x %4x %4x %4x "
1211              "%4x %4x %4x %4x %4x %4x %4x %4x\n",
1212              m[0], m[1], m[2], m[3],
1213              (unsigned int)sizeof (char),
1214              (unsigned int)sizeof (char *),
1215              (unsigned int)sizeof (int),
1216              (unsigned int)sizeof (FcPattern),
1217              (unsigned int)sizeof (FcPatternEltPtr),
1218              (unsigned int)sizeof (struct _FcPatternElt *),
1219              (unsigned int)sizeof (FcPatternElt),
1220              (unsigned int)sizeof (FcObjectPtr),
1221              (unsigned int)sizeof (FcValueListPtr),
1222              (unsigned int)sizeof (FcValue),
1223              (unsigned int)sizeof (FcValueBinding),
1224              (unsigned int)sizeof (struct _FcValueList *),
1225              (unsigned int)sizeof (FcCharSet),
1226              (unsigned int)sizeof (FcCharLeaf **),
1227              (unsigned int)sizeof (FcChar16 *),
1228              (unsigned int)sizeof (FcChar16),
1229              (unsigned int)sizeof (FcCharLeaf),
1230              (unsigned int)sizeof (FcChar32),
1231              (unsigned int)sizeof (FcCache),
1232              (unsigned int)sysconf(_SC_PAGESIZE));
1233
1234     return buf;
1235 }
1236
1237 static int banks_ptr = 0, banks_alloc = 0;
1238 int * _fcBankId = 0, * _fcBankIdx = 0;
1239 static const char ** bankDirs = 0;
1240
1241 static FcBool
1242 FcCacheHaveBank (int bank)
1243 {
1244     int i;
1245
1246     if (bank < FC_BANK_FIRST)
1247         return FcTrue;
1248
1249     for (i = 0; i < banks_ptr; i++)
1250         if (_fcBankId[i] == bank)
1251             return FcTrue;
1252
1253     return FcFalse;
1254 }
1255
1256 int
1257 FcCacheBankToIndexMTF (int bank)
1258 {
1259     int i, j;
1260
1261     for (i = 0; i < banks_ptr; i++)
1262         if (_fcBankId[_fcBankIdx[i]] == bank)
1263         {
1264             int t = _fcBankIdx[i];
1265
1266             for (j = i; j > 0; j--)
1267                 _fcBankIdx[j] = _fcBankIdx[j-1];
1268             _fcBankIdx[0] = t;
1269             return t;
1270         }
1271
1272     if (banks_ptr >= banks_alloc)
1273     {
1274         int * b, * bidx;
1275         const char ** bds;
1276
1277         b = realloc (_fcBankId, (banks_alloc + 4) * sizeof(int));
1278         if (!b)
1279             return -1;
1280         _fcBankId = b;
1281
1282         bidx = realloc (_fcBankIdx, (banks_alloc + 4) * sizeof(int));
1283         if (!bidx)
1284             return -1;
1285         _fcBankIdx = bidx;
1286
1287         bds = realloc (bankDirs, (banks_alloc + 4) * sizeof (char *));
1288         if (!bds)
1289             return -1;
1290         bankDirs = bds;
1291
1292         banks_alloc += 4;
1293     }
1294
1295     i = banks_ptr++;
1296     _fcBankId[i] = bank;
1297     _fcBankIdx[i] = i;
1298     return i;
1299 }
1300
1301 static void
1302 FcCacheAddBankDir (int bank, const char * dir)
1303 {
1304     int bi = FcCacheBankToIndexMTF (bank);
1305
1306     if (bi < 0)
1307         return;
1308
1309     bankDirs[bi] = (const char *)FcStrCopy ((FcChar8 *)dir);
1310 }
1311
1312 const char *
1313 FcCacheFindBankDir (int bank)
1314 {
1315     int bi = FcCacheBankToIndex (bank);
1316     return bankDirs[bi];
1317 }
1318
1319 /*
1320  * This code implements the MD5 message-digest algorithm.
1321  * The algorithm is due to Ron Rivest.  This code was
1322  * written by Colin Plumb in 1993, no copyright is claimed.
1323  * This code is in the public domain; do with it what you wish.
1324  *
1325  * Equivalent code is available from RSA Data Security, Inc.
1326  * This code has been tested against that, and is equivalent,
1327  * except that you don't need to include two pages of legalese
1328  * with every copy.
1329  *
1330  * To compute the message digest of a chunk of bytes, declare an
1331  * MD5Context structure, pass it to MD5Init, call MD5Update as
1332  * needed on buffers full of bytes, and then call MD5Final, which
1333  * will fill a supplied 16-byte array with the digest.
1334  */
1335
1336 #ifndef HIGHFIRST
1337 #define byteReverse(buf, len)   /* Nothing */
1338 #else
1339 /*
1340  * Note: this code is harmless on little-endian machines.
1341  */
1342 void byteReverse(unsigned char *buf, unsigned longs)
1343 {
1344     FcChar32 t;
1345     do {
1346         t = (FcChar32) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
1347             ((unsigned) buf[1] << 8 | buf[0]);
1348         *(FcChar32 *) buf = t;
1349         buf += 4;
1350     } while (--longs);
1351 }
1352 #endif
1353
1354 /*
1355  * Start MD5 accumulation.  Set bit count to 0 and buffer to mysterious
1356  * initialization constants.
1357  */
1358 static void MD5Init(struct MD5Context *ctx)
1359 {
1360     ctx->buf[0] = 0x67452301;
1361     ctx->buf[1] = 0xefcdab89;
1362     ctx->buf[2] = 0x98badcfe;
1363     ctx->buf[3] = 0x10325476;
1364
1365     ctx->bits[0] = 0;
1366     ctx->bits[1] = 0;
1367 }
1368
1369 /*
1370  * Update context to reflect the concatenation of another buffer full
1371  * of bytes.
1372  */
1373 static void MD5Update(struct MD5Context *ctx, unsigned char *buf, unsigned len)
1374 {
1375     FcChar32 t;
1376
1377     /* Update bitcount */
1378
1379     t = ctx->bits[0];
1380     if ((ctx->bits[0] = t + ((FcChar32) len << 3)) < t)
1381         ctx->bits[1]++;         /* Carry from low to high */
1382     ctx->bits[1] += len >> 29;
1383
1384     t = (t >> 3) & 0x3f;        /* Bytes already in shsInfo->data */
1385
1386     /* Handle any leading odd-sized chunks */
1387
1388     if (t) {
1389         unsigned char *p = (unsigned char *) ctx->in + t;
1390
1391         t = 64 - t;
1392         if (len < t) {
1393             memcpy(p, buf, len);
1394             return;
1395         }
1396         memcpy(p, buf, t);
1397         byteReverse(ctx->in, 16);
1398         MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
1399         buf += t;
1400         len -= t;
1401     }
1402     /* Process data in 64-byte chunks */
1403
1404     while (len >= 64) {
1405         memcpy(ctx->in, buf, 64);
1406         byteReverse(ctx->in, 16);
1407         MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
1408         buf += 64;
1409         len -= 64;
1410     }
1411
1412     /* Handle any remaining bytes of data. */
1413
1414     memcpy(ctx->in, buf, len);
1415 }
1416
1417 /*
1418  * Final wrapup - pad to 64-byte boundary with the bit pattern
1419  * 1 0* (64-bit count of bits processed, MSB-first)
1420  */
1421 static void MD5Final(unsigned char digest[16], struct MD5Context *ctx)
1422 {
1423     unsigned count;
1424     unsigned char *p;
1425
1426     /* Compute number of bytes mod 64 */
1427     count = (ctx->bits[0] >> 3) & 0x3F;
1428
1429     /* Set the first char of padding to 0x80.  This is safe since there is
1430        always at least one byte free */
1431     p = ctx->in + count;
1432     *p++ = 0x80;
1433
1434     /* Bytes of padding needed to make 64 bytes */
1435     count = 64 - 1 - count;
1436
1437     /* Pad out to 56 mod 64 */
1438     if (count < 8) {
1439         /* Two lots of padding:  Pad the first block to 64 bytes */
1440         memset(p, 0, count);
1441         byteReverse(ctx->in, 16);
1442         MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
1443
1444         /* Now fill the next block with 56 bytes */
1445         memset(ctx->in, 0, 56);
1446     } else {
1447         /* Pad block to 56 bytes */
1448         memset(p, 0, count - 8);
1449     }
1450     byteReverse(ctx->in, 14);
1451
1452     /* Append length in bits and transform */
1453     ((FcChar32 *) ctx->in)[14] = ctx->bits[0];
1454     ((FcChar32 *) ctx->in)[15] = ctx->bits[1];
1455
1456     MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
1457     byteReverse((unsigned char *) ctx->buf, 4);
1458     memcpy(digest, ctx->buf, 16);
1459     memset(ctx, 0, sizeof(ctx));        /* In case it's sensitive */
1460 }
1461
1462
1463 /* The four core functions - F1 is optimized somewhat */
1464
1465 /* #define F1(x, y, z) (x & y | ~x & z) */
1466 #define F1(x, y, z) (z ^ (x & (y ^ z)))
1467 #define F2(x, y, z) F1(z, x, y)
1468 #define F3(x, y, z) (x ^ y ^ z)
1469 #define F4(x, y, z) (y ^ (x | ~z))
1470
1471 /* This is the central step in the MD5 algorithm. */
1472 #define MD5STEP(f, w, x, y, z, data, s) \
1473         ( w += f(x, y, z) + data,  w = w<<s | w>>(32-s),  w += x )
1474
1475 /*
1476  * The core of the MD5 algorithm, this alters an existing MD5 hash to
1477  * reflect the addition of 16 longwords of new data.  MD5Update blocks
1478  * the data and converts bytes into longwords for this routine.
1479  */
1480 static void MD5Transform(FcChar32 buf[4], FcChar32 in[16])
1481 {
1482     register FcChar32 a, b, c, d;
1483
1484     a = buf[0];
1485     b = buf[1];
1486     c = buf[2];
1487     d = buf[3];
1488
1489     MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
1490     MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
1491     MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
1492     MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
1493     MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
1494     MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
1495     MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
1496     MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
1497     MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
1498     MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
1499     MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
1500     MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
1501     MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
1502     MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
1503     MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
1504     MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
1505
1506     MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
1507     MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
1508     MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
1509     MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
1510     MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
1511     MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
1512     MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
1513     MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
1514     MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
1515     MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
1516     MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
1517     MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
1518     MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
1519     MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
1520     MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
1521     MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
1522
1523     MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
1524     MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
1525     MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
1526     MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
1527     MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
1528     MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
1529     MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
1530     MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
1531     MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
1532     MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
1533     MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
1534     MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
1535     MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
1536     MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
1537     MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
1538     MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
1539
1540     MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
1541     MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
1542     MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
1543     MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
1544     MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
1545     MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
1546     MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
1547     MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
1548     MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
1549     MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
1550     MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
1551     MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
1552     MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
1553     MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
1554     MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
1555     MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
1556
1557     buf[0] += a;
1558     buf[1] += b;
1559     buf[2] += c;
1560     buf[3] += d;
1561 }