src/fccache.c

   1 /*
   2  * $RCSId: xc/lib/fontconfig/src/fccache.c,v 1.12 2002/08/22 07:36:44 keithp Exp $
   3  *
   4  * Copyright © 2000 Keith Packard
   5  * Copyright © 2005 Patrick Lam
   6  *
   7  * Permission to use, copy, modify, distribute, and sell this software and its
   8  * documentation for any purpose is hereby granted without fee, provided that
   9  * the above copyright notice appear in all copies and that both that
  10  * copyright notice and this permission notice appear in supporting
  11  * documentation, and that the name of Keith Packard not be used in
  12  * advertising or publicity pertaining to distribution of the software without
  13  * specific, written prior permission.  Keith Packard makes no
  14  * representations about the suitability of this software for any purpose.  It
  15  * is provided "as is" without express or implied warranty.
  16  *
  17  * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  18  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  19  * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  20  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  21  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  22  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  23  * PERFORMANCE OF THIS SOFTWARE.
  24  */
  25
  26 #include <fcntl.h>
  27 #include <dirent.h>
  28 #include <string.h>
  29 #include <sys/mman.h>
  30 #include <sys/utsname.h>
  31 #include <sys/types.h>
  32 #include <unistd.h>
  33 #include "fcint.h"
  34 #include <unistd.h>
  35
  36 #define ENDIAN_TEST 0x12345678
  37 #define MACHINE_SIGNATURE_SIZE 9 + 5*20 + 1
  38
  39 static int
  40 FcDirCacheOpen (const FcChar8 * dir);
  41
  42 static char *
  43 FcDirCacheHashName (char * cache_file, int collisions);
  44
  45 static off_t
  46 FcCacheSkipToArch (int fd, const char * arch);
  47
  48 static FcBool
  49 FcCacheCopyOld (int fd, int fd_orig, off_t start);
  50
  51 static void *
  52 FcDirCacheProduce (FcFontSet *set, FcCache * metadata);
  53
  54 static FcBool
  55 FcDirCacheConsume (int fd, const char * dir, FcFontSet *set, FcConfig *config);
  56
  57 static int
  58 FcCacheNextOffset(off_t w);
  59
  60 static char *
  61 FcCacheMachineSignature (void);
  62
  63 static FcBool
  64 FcCacheHaveBank (int bank);
  65
  66 static void
  67 FcCacheAddBankDir (int bank, const char * dir);
  68
  69 struct MD5Context {
  70         FcChar32 buf[4];
  71         FcChar32 bits[2];
  72         unsigned char in[64];
  73 };
  74
  75 static void MD5Init(struct MD5Context *ctx);
  76 static void MD5Update(struct MD5Context *ctx, unsigned char *buf, unsigned len);
  77 static void MD5Final(unsigned char digest[16], struct MD5Context *ctx);
  78 static void MD5Transform(FcChar32 buf[4], FcChar32 in[16]);
  79
  80 #define FC_DBG_CACHE_REF    1024
  81
  82 static char *
  83 FcCacheReadString (int fd, char *dest, int len)
  84 {
  85     FcChar8     c;
  86     FcBool      escape;
  87     int         size;
  88     int         i;
  89
  90     if (len == 0)
  91         return 0;
  92
  93     size = len;
  94     i = 0;
  95     escape = FcFalse;
  96     while (read (fd, &c, 1) == 1)
  97     {
  98         if (!escape)
  99         {
 100             switch (c) {
 101             case '"':
 102                 c = '\0';
 103                 break;
 104             case '\\':
 105                 escape = FcTrue;
 106                 continue;
 107             }
 108         }
 109         if (i == size)
 110         {
 111             dest[i++] = 0;
 112             return dest;
 113         }
 114         dest[i++] = c;
 115         if (c == '\0')
 116             return dest;
 117         escape = FcFalse;
 118     }
 119     return 0;
 120 }
 121
 122 static void
 123 FcCacheSkipString (int fd)
 124 {
 125     FcChar8     c;
 126     FcBool      escape;
 127
 128     escape = FcFalse;
 129     while (read (fd, &c, 1) == 1)
 130     {
 131         if (!escape)
 132         {
 133             switch (c) {
 134             case '"':
 135                 c = '\0';
 136                 break;
 137             case '\\':
 138                 escape = FcTrue;
 139                 continue;
 140             }
 141         }
 142         if (c == '\0')
 143             return;
 144         escape = FcFalse;
 145     }
 146     return;
 147 }
 148
 149 static FcBool
 150 FcCacheWriteString (int fd, const char *chars)
 151 {
 152     if (write (fd, chars, strlen(chars)+1) != strlen(chars)+1)
 153         return FcFalse;
 154     return FcTrue;
 155 }
 156
 157 static void
 158 FcGlobalCacheDirDestroy (FcGlobalCacheDir *d)
 159 {
 160     FcStrSetDestroy (d->subdirs);
 161     FcMemFree (FC_MEM_STRING, strlen (d->name)+1);
 162     free (d->name);
 163     FcMemFree (FC_MEM_CACHE, sizeof (FcGlobalCacheDir));
 164     free (d);
 165 }
 166
 167 FcGlobalCache *
 168 FcGlobalCacheCreate (void)
 169 {
 170     FcGlobalCache   *cache;
 171
 172     cache = malloc (sizeof (FcGlobalCache));
 173     if (!cache)
 174         return 0;
 175     FcMemAlloc (FC_MEM_CACHE, sizeof (FcGlobalCache));
 176     cache->dirs = 0;
 177     cache->updated = FcFalse;
 178     cache->fd = -1;
 179     return cache;
 180 }
 181
 182 void
 183 FcGlobalCacheDestroy (FcGlobalCache *cache)
 184 {
 185     FcGlobalCacheDir    *d, *next;
 186
 187     for (d = cache->dirs; d; d = next)
 188     {
 189         next = d->next;
 190         FcGlobalCacheDirDestroy (d);
 191     }
 192     FcMemFree (FC_MEM_CACHE, sizeof (FcGlobalCache));
 193     free (cache);
 194 }
 195
 196 void
 197 FcGlobalCacheLoad (FcGlobalCache    *cache,
 198                    FcStrSet         *staleDirs,
 199                    const FcChar8    *cache_file,
 200                    FcConfig         *config)
 201 {
 202     char                name_buf[FC_MAX_FILE_LEN];
 203     FcGlobalCacheDir    *d, *next;
 204     FcFileTime          config_time = FcConfigModifiedTime (config);
 205     char                * current_arch_machine_name;
 206     char                candidate_arch_machine_name[MACHINE_SIGNATURE_SIZE + 9];
 207     off_t               current_arch_start;
 208
 209     struct stat         cache_stat, dir_stat;
 210     char                subdirName[FC_MAX_FILE_LEN + 1 + 12 + 1];
 211
 212     if (stat ((char *) cache_file, &cache_stat) < 0)
 213         return;
 214
 215     cache->fd = open ((char *) cache_file, O_RDONLY);
 216     if (cache->fd == -1)
 217         return;
 218
 219     cache->updated = FcFalse;
 220
 221     if (!FcCacheReadString (cache->fd, name_buf, sizeof (name_buf)))
 222         goto bail_and_destroy;
 223     if (strcmp (name_buf, FC_GLOBAL_MAGIC_COOKIE) != 0)
 224         goto bail_and_destroy;
 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     if (!FcCacheReadString (cache->fd, candidate_arch_machine_name,
 234                             sizeof (candidate_arch_machine_name)))
 235         goto bail_and_destroy;
 236     if (strlen(candidate_arch_machine_name) == 0)
 237         goto bail_and_destroy;
 238
 239     while (1)
 240     {
 241         off_t targ;
 242
 243         if (!FcCacheReadString (cache->fd, name_buf, sizeof (name_buf)) ||
 244             !strlen(name_buf))
 245             break;
 246
 247         /* Directory must be older than the global cache file; also
 248            cache must be newer than the config file. */
 249         if (stat ((char *) name_buf, &dir_stat) < 0 ||
 250             dir_stat.st_mtime > cache_stat.st_mtime ||
 251             (config_time.set && cache_stat.st_mtime < config_time.time))
 252         {
 253             FcCache md;
 254             off_t off;
 255
 256             FcStrSetAdd (staleDirs, FcStrCopy ((FcChar8 *)name_buf));
 257             if (read (cache->fd, &md, sizeof (FcCache)) != sizeof(FcCache))
 258             {
 259                 perror ("read metadata");
 260                 goto bail1;
 261             }
 262             off = FcCacheNextOffset (lseek(cache->fd, 0, SEEK_CUR)) + md.count;
 263             if (lseek (cache->fd, off, SEEK_SET) != off) {
 264                 perror ("lseek");
 265                 goto bail1;
 266             }
 267             continue;
 268         }
 269
 270         d = malloc (sizeof (FcGlobalCacheDir));
 271         if (!d)
 272             goto bail1;
 273
 274         d->next = cache->dirs;
 275         cache->dirs = d;
 276
 277         d->name = (char *)FcStrCopy ((FcChar8 *)name_buf);
 278         d->ent = 0;
 279
 280         d->subdirs = FcStrSetCreate();
 281         do
 282         {
 283             if (!FcCacheReadString (cache->fd, subdirName,
 284                                     sizeof (subdirName)) ||
 285                 !strlen (subdirName))
 286                 break;
 287             FcStrSetAdd (d->subdirs, (FcChar8 *)subdirName);
 288         } while (1);
 289
 290         d->offset = lseek (cache->fd, 0, SEEK_CUR);
 291         if (read (cache->fd, &d->metadata, sizeof (FcCache)) != sizeof (FcCache))
 292             goto bail1;
 293         targ = FcCacheNextOffset (lseek(cache->fd, 0, SEEK_CUR)) + d->metadata.count;
 294         if (lseek (cache->fd, targ, SEEK_SET) != targ)
 295             goto bail1;
 296     }
 297     return;
 298
 299  bail1:
 300     for (d = cache->dirs; d; d = next)
 301     {
 302         next = d->next;
 303         free (d);
 304     }
 305     cache->dirs = 0;
 306
 307     close (cache->fd);
 308     cache->fd = -1;
 309     return;
 310
 311  bail_and_destroy:
 312     close (cache->fd);
 313     cache->fd = -1;
 314
 315     if (stat ((char *) cache_file, &cache_stat) == 0)
 316         unlink ((char *)cache_file);
 317
 318     return;
 319
 320 }
 321
 322 FcBool
 323 FcGlobalCacheReadDir (FcFontSet *set, FcStrSet *dirs, FcGlobalCache * cache, const char *dir, FcConfig *config)
 324 {
 325     FcGlobalCacheDir    *d;
 326     FcBool              ret = FcFalse;
 327     int                 i;
 328
 329     if (cache->fd == -1)
 330         return FcFalse;
 331
 332     if (!(dir = (char *)FcConfigNormalizeFontDir (config, (FcChar8 *)dir)))
 333         return FcFalse; /* non-existing directory */
 334
 335     for (d = cache->dirs; d; d = d->next)
 336     {
 337         if (strncmp (d->name, dir, strlen(dir)) == 0)
 338         {
 339             lseek (cache->fd, d->offset, SEEK_SET);
 340             if (!FcDirCacheConsume (cache->fd, d->name, set, config))
 341                 return FcFalse;
 342
 343             if (strcmp (d->name, dir) == 0)
 344             {
 345                 for (i = 0; i < d->subdirs->num; i++)
 346                     FcStrSetAdd (dirs, (FcChar8 *)d->subdirs->strs[i]);
 347
 348                 ret = FcTrue;
 349             }
 350         }
 351     }
 352
 353     return ret;
 354 }
 355
 356 FcBool
 357 FcGlobalCacheUpdate (FcGlobalCache  *cache,
 358                      FcStrSet       *dirs,
 359                      const char     *name,
 360                      FcFontSet      *set,
 361                      FcConfig       *config)
 362 {
 363     FcGlobalCacheDir    *d;
 364     int                 i;
 365
 366     name = (char *)FcConfigNormalizeFontDir (config, (FcChar8 *)name);
 367     for (d = cache->dirs; d; d = d->next)
 368     {
 369         if (strcmp(d->name, name) == 0)
 370             break;
 371     }
 372
 373     if (!d)
 374     {
 375         d = malloc (sizeof (FcGlobalCacheDir));
 376         if (!d)
 377             return FcFalse;
 378         d->next = cache->dirs;
 379         cache->dirs = d;
 380     }
 381
 382     cache->updated = FcTrue;
 383
 384     d->name = (char *)FcStrCopy ((FcChar8 *)name);
 385     d->ent = FcDirCacheProduce (set, &d->metadata);
 386     d->offset = 0;
 387     d->subdirs = FcStrSetCreate();
 388     for (i = 0; i < dirs->num; i++)
 389         FcStrSetAdd (d->subdirs, dirs->strs[i]);
 390     return FcTrue;
 391 }
 392
 393 FcBool
 394 FcGlobalCacheSave (FcGlobalCache    *cache,
 395                    const FcChar8    *cache_file,
 396                    FcConfig         *config)
 397 {
 398     int                 fd, fd_orig, i;
 399     FcGlobalCacheDir    *dir;
 400     FcAtomic            *atomic;
 401     off_t               current_arch_start = 0, truncate_to;
 402     char                * current_arch_machine_name, * header;
 403
 404     if (!cache->updated)
 405         return FcTrue;
 406
 407 #if defined (HAVE_GETUID) && defined (HAVE_GETEUID)
 408     /* Set-UID programs can't safely update the cache */
 409     if (getuid () != geteuid ())
 410         return FcFalse;
 411 #endif
 412
 413     atomic = FcAtomicCreate (cache_file);
 414     if (!atomic)
 415         return FcFalse;
 416
 417     if (!FcAtomicLock (atomic))
 418         goto bail1;
 419     fd = open ((char *) FcAtomicNewFile(atomic), O_RDWR | O_CREAT,
 420                S_IRUSR | S_IWUSR);
 421     if (fd == -1)
 422         goto bail2;
 423     FcCacheWriteString (fd, FC_GLOBAL_MAGIC_COOKIE);
 424
 425     fd_orig = open ((char *) FcAtomicOrigFile(atomic), O_RDONLY);
 426
 427     current_arch_machine_name = FcCacheMachineSignature ();
 428     if (fd_orig == -1)
 429         current_arch_start = 0;
 430     else
 431         current_arch_start = FcCacheSkipToArch (fd_orig,
 432                                                 current_arch_machine_name);
 433
 434     if (current_arch_start < 0)
 435     {
 436         off_t i = lseek(fd_orig, 0, SEEK_END);
 437         if (i < strlen (FC_GLOBAL_MAGIC_COOKIE)+1)
 438             i = strlen (FC_GLOBAL_MAGIC_COOKIE)+1;
 439         current_arch_start = FcCacheNextOffset (i);
 440     }
 441
 442     if (!FcCacheCopyOld(fd, fd_orig, current_arch_start))
 443         goto bail3;
 444
 445     close (fd_orig);
 446     fd_orig = -1;
 447
 448     current_arch_start = lseek(fd, 0, SEEK_CUR);
 449     if (ftruncate (fd, current_arch_start) == -1)
 450         goto bail3;
 451
 452     header = malloc (10 + strlen (current_arch_machine_name));
 453     if (!header)
 454         goto bail3;
 455
 456     truncate_to = current_arch_start + strlen(current_arch_machine_name) + 11;
 457     for (dir = cache->dirs; dir; dir = dir->next)
 458     {
 459         truncate_to += strlen(dir->name) + 1;
 460         truncate_to += sizeof (FcCache);
 461         truncate_to = FcCacheNextOffset (truncate_to);
 462         truncate_to += dir->metadata.count;
 463
 464         for (i = 0; i < dir->subdirs->size; i++)
 465             truncate_to += strlen((char *)dir->subdirs->strs[i]) + 1;
 466         truncate_to ++;
 467     }
 468     truncate_to -= current_arch_start;
 469
 470     sprintf (header, "%8x ", (int)truncate_to);
 471     strcat (header, current_arch_machine_name);
 472     if (!FcCacheWriteString (fd, header))
 473         goto bail4;
 474
 475     for (dir = cache->dirs; dir; dir = dir->next)
 476     {
 477         if (dir->name)
 478         {
 479             const char * d = (const char *)FcConfigNormalizeFontDir (config, (const FcChar8 *)dir->name);
 480             off_t off;
 481
 482             FcCacheWriteString (fd, d);
 483
 484             for (i = 0; i < dir->subdirs->size; i++)
 485                 FcCacheWriteString (fd, (char *)dir->subdirs->strs[i]);
 486             FcCacheWriteString (fd, "");
 487
 488             if (write (fd, &dir->metadata, sizeof(FcCache)) != sizeof(FcCache))
 489             {
 490                 perror ("write metadata");
 491                 free (dir->ent);
 492                 continue;
 493             }
 494             off = FcCacheNextOffset (lseek(fd, 0, SEEK_CUR));
 495             if (lseek (fd, off, SEEK_SET) != off)
 496             {
 497                 perror ("lseek");
 498                 free (dir->ent);
 499                 continue;
 500             }
 501             if (write (fd, dir->ent, dir->metadata.count) != dir->metadata.count)
 502             {
 503                 perror ("write dirent");
 504                 free (dir->ent);
 505                 continue;
 506             }
 507            free (dir->ent);
 508         }
 509     }
 510     FcCacheWriteString (fd, "");
 511
 512     if (close (fd) == -1)
 513         goto bail25;
 514
 515     if (!FcAtomicReplaceOrig (atomic))
 516         goto bail25;
 517
 518     FcAtomicUnlock (atomic);
 519     FcAtomicDestroy (atomic);
 520
 521     cache->updated = FcFalse;
 522     return FcTrue;
 523
 524  bail4:
 525     free (header);
 526  bail3:
 527     if (fd_orig != -1)
 528         close (fd_orig);
 529
 530     close (fd);
 531  bail25:
 532     FcAtomicDeleteNew (atomic);
 533  bail2:
 534     FcAtomicUnlock (atomic);
 535  bail1:
 536     FcAtomicDestroy (atomic);
 537     return FcFalse;
 538 }
 539
 540 /*
 541  * Find the next presumably-mmapable offset after the supplied file
 542  * position.
 543  */
 544 static int
 545 FcCacheNextOffset(off_t w)
 546 {
 547     static long pagesize = -1;
 548     if (pagesize == -1)
 549         pagesize = sysconf(_SC_PAGESIZE);
 550     if (w % pagesize == 0)
 551         return w;
 552     else
 553         return ((w / pagesize)+1)*pagesize;
 554 }
 555
 556 /* return the address of the segment for the provided arch,
 557  * or -1 if arch not found */
 558 static off_t
 559 FcCacheSkipToArch (int fd, const char * arch)
 560 {
 561     char candidate_arch_machine_name_count[MACHINE_SIGNATURE_SIZE + 9];
 562     char * candidate_arch;
 563     off_t current_arch_start = 0;
 564
 565     lseek (fd, 0, SEEK_SET);
 566     FcCacheSkipString (fd);
 567     current_arch_start = lseek (fd, 0, SEEK_CUR);
 568
 569     /* skip arches that are not the current arch */
 570     while (1)
 571     {
 572         long bs;
 573
 574         if (lseek (fd, current_arch_start, SEEK_SET) != current_arch_start)
 575             return -1;
 576
 577         if (FcCacheReadString (fd, candidate_arch_machine_name_count,
 578                                 sizeof (candidate_arch_machine_name_count)) == 0)
 579             return -1;
 580         if (!strlen(candidate_arch_machine_name_count))
 581             return -1;
 582         bs = strtol(candidate_arch_machine_name_count, &candidate_arch, 16);
 583
 584         // count = 0 should probably be distinguished from the !bs condition
 585         if (!bs || bs < strlen (candidate_arch_machine_name_count))
 586             return -1;
 587
 588         candidate_arch++; /* skip leading space */
 589
 590         if (strcmp (candidate_arch, arch)==0)
 591             return current_arch_start;
 592         current_arch_start += bs;
 593     }
 594
 595     return -1;
 596 }
 597
 598 /* Cuts out the segment at the file pointer (moves everything else
 599  * down to cover it), and leaves the file pointer at the end of the
 600  * file. */
 601 static FcBool
 602 FcCacheCopyOld (int fd, int fd_orig, off_t start)
 603 {
 604     char * buf = malloc (8192);
 605     char candidate_arch_machine_name[MACHINE_SIGNATURE_SIZE + 9];
 606     long bs;
 607     int c, bytes_skipped;
 608     off_t loc;
 609
 610     if (!buf)
 611         return FcFalse;
 612
 613     loc = 0;
 614     lseek (fd, 0, SEEK_SET); lseek (fd_orig, 0, SEEK_SET);
 615     do
 616     {
 617         int b = 8192;
 618         if (loc + b > start)
 619             b = start - loc;
 620
 621         if ((c = read (fd_orig, buf, b)) <= 0)
 622             break;
 623         if (write (fd, buf, c) < 0)
 624             goto bail;
 625
 626         loc += c;
 627     }
 628     while (c > 0);
 629
 630     lseek (fd, start, SEEK_SET);
 631     if (FcCacheReadString (fd, candidate_arch_machine_name,
 632                            sizeof (candidate_arch_machine_name)) == 0)
 633         goto done;
 634     if (!strlen(candidate_arch_machine_name))
 635         goto done;
 636
 637     bs = strtol(candidate_arch_machine_name, 0, 16);
 638     if (bs == 0)
 639         goto done;
 640
 641     bytes_skipped = 0;
 642     do
 643     {
 644         lseek (fd, start+bs+bytes_skipped, SEEK_SET);
 645         if ((c = read (fd, buf, 8192)) <= 0)
 646             break;
 647         lseek (fd, start+bytes_skipped, SEEK_SET);
 648         if (write (fd, buf, c) < 0)
 649             goto bail;
 650         bytes_skipped += c;
 651     }
 652     while (c > 0);
 653     lseek (fd, start+bytes_skipped, SEEK_SET);
 654
 655  done:
 656     free (buf);
 657     return FcTrue;
 658
 659  bail:
 660     free (buf);
 661     return FcFalse;
 662 }
 663
 664 /* Does not check that the cache has the appropriate arch section. */
 665 /* Also, this can be fooled if the original location has a stale
 666  * cache, and the hashed location has an up-to-date cache.  Oh well,
 667  * sucks to be you in that case! */
 668 FcBool
 669 FcDirCacheValid (const FcChar8 *dir)
 670 {
 671     struct stat file_stat, dir_stat;
 672     int         fd;
 673
 674     if (stat ((char *) dir, &dir_stat) < 0)
 675         return FcFalse;
 676
 677     fd = FcDirCacheOpen (dir);
 678
 679     if (fd < 0)
 680         goto bail;
 681     if (fstat (fd, &file_stat) < 0)
 682         goto bail;
 683
 684     close (fd);
 685
 686     /*
 687      * If the directory has been modified more recently than
 688      * the cache file, the cache is not valid
 689      */
 690     if (dir_stat.st_mtime > file_stat.st_mtime)
 691         return FcFalse;
 692
 693     return FcTrue;
 694
 695  bail:
 696     close (fd);
 697     return FcFalse;
 698 }
 699
 700 /* Assumes that the cache file in 'dir' exists.
 701  * Checks that the cache has the appropriate arch section. */
 702 FcBool
 703 FcDirCacheHasCurrentArch (const FcChar8 *dir)
 704 {
 705     int         fd;
 706     off_t       current_arch_start;
 707     char        *current_arch_machine_name;
 708
 709     fd = FcDirCacheOpen (dir);
 710     if (fd < 0)
 711         goto bail;
 712
 713     current_arch_machine_name = FcCacheMachineSignature();
 714     current_arch_start = FcCacheSkipToArch(fd, current_arch_machine_name);
 715     close (fd);
 716
 717     if (current_arch_start < 0)
 718         return FcFalse;
 719
 720     return FcTrue;
 721
 722  bail:
 723     return FcFalse;
 724 }
 725
 726 FcBool
 727 FcDirCacheUnlink (const FcChar8 *dir, FcConfig *config)
 728 {
 729     char        *cache_file;
 730     char        *cache_hashed = 0;
 731     int         fd, collisions;
 732     struct stat cache_stat;
 733     char        name_buf[FC_MAX_FILE_LEN];
 734
 735     dir = FcConfigNormalizeFontDir (config, dir);
 736     cache_file = (char *)FcStrPlus (dir, (FcChar8 *) "/" FC_DIR_CACHE_FILE);
 737     if (!cache_file)
 738         return FcFalse;
 739
 740     /* First remove normal cache file. */
 741     if (stat ((char *) cache_file, &cache_stat) == 0 &&
 742         unlink ((char *)cache_file) != 0)
 743         goto bail;
 744
 745     /* Next remove any applicable hashed files. */
 746     fd = -1; collisions = 0;
 747     do
 748     {
 749         if (cache_hashed)
 750             FcStrFree ((FcChar8 *)cache_hashed);
 751
 752         cache_hashed = FcDirCacheHashName (cache_file, collisions++);
 753         if (!cache_hashed)
 754             goto bail;
 755
 756         if (fd > 0)
 757             close (fd);
 758         fd = open(cache_hashed, O_RDONLY);
 759         if (fd == -1)
 760         {
 761             FcStrFree ((FcChar8 *)cache_file);
 762             return FcTrue;
 763         }
 764
 765         if (!FcCacheReadString (fd, name_buf, sizeof (name_buf)) || !strlen(name_buf))
 766         {
 767             FcStrFree ((FcChar8 *)cache_hashed);
 768             goto bail;
 769         }
 770     } while (strcmp (name_buf, cache_file) != 0);
 771
 772     close (fd);
 773
 774     if (stat ((char *) cache_hashed, &cache_stat) == 0 &&
 775         unlink ((char *)cache_hashed) != 0)
 776     {
 777         FcStrFree ((FcChar8 *)cache_hashed);
 778         goto bail;
 779     }
 780
 781     FcStrFree ((FcChar8 *)cache_file);
 782     FcStrFree ((FcChar8 *)cache_hashed);
 783     return FcTrue;
 784
 785  bail:
 786     FcStrFree ((FcChar8 *)cache_file);
 787     return FcFalse;
 788 }
 789
 790 static int
 791 FcCacheReadDirs (FcConfig * config, FcGlobalCache * cache,
 792                  FcStrList *list, FcFontSet * set)
 793 {
 794     int                 ret = 0;
 795     FcChar8             *dir;
 796     FcChar8             *file, *base;
 797     FcStrSet            *subdirs;
 798     FcStrList           *sublist;
 799     struct stat         statb;
 800
 801     /*
 802      * Read in the results from 'list'.
 803      */
 804     while ((dir = FcStrListNext (list)))
 805     {
 806         if (!FcConfigAcceptFilename (config, dir))
 807             continue;
 808
 809         /* freed below */
 810         file = (FcChar8 *) malloc (strlen ((char *) dir) + 1 + FC_MAX_FILE_LEN + 1);
 811         if (!file)
 812             return FcFalse;
 813
 814         strcpy ((char *) file, (char *) dir);
 815         strcat ((char *) file, "/");
 816         base = file + strlen ((char *) file);
 817
 818         subdirs = FcStrSetCreate ();
 819         if (!subdirs)
 820         {
 821             fprintf (stderr, "Can't create directory set\n");
 822             ret++;
 823             free (file);
 824             continue;
 825         }
 826
 827         if (access ((char *) dir, X_OK) < 0)
 828         {
 829             switch (errno) {
 830             case ENOENT:
 831             case ENOTDIR:
 832             case EACCES:
 833                 break;
 834             default:
 835                 fprintf (stderr, "\"%s\": ", dir);
 836                 perror ("");
 837                 ret++;
 838             }
 839             FcStrSetDestroy (subdirs);
 840             free (file);
 841             continue;
 842         }
 843         if (stat ((char *) dir, &statb) == -1)
 844         {
 845             fprintf (stderr, "\"%s\": ", dir);
 846             perror ("");
 847             FcStrSetDestroy (subdirs);
 848             ret++;
 849             free (file);
 850             continue;
 851         }
 852         if (!S_ISDIR (statb.st_mode))
 853         {
 854             fprintf (stderr, "\"%s\": not a directory, skipping\n", dir);
 855             FcStrSetDestroy (subdirs);
 856             free (file);
 857             continue;
 858         }
 859         if (!FcDirCacheValid (dir) || !FcDirCacheRead (set, subdirs, dir, config))
 860         {
 861             if (FcDebug () & FC_DBG_FONTSET)
 862                 printf ("cache scan dir %s\n", dir);
 863
 864             FcDirScanConfig (set, subdirs, cache,
 865                              config->blanks, dir, FcFalse, config);
 866         }
 867         sublist = FcStrListCreate (subdirs);
 868         FcStrSetDestroy (subdirs);
 869         if (!sublist)
 870         {
 871             fprintf (stderr, "Can't create subdir list in \"%s\"\n", dir);
 872             ret++;
 873             free (file);
 874             continue;
 875         }
 876         ret += FcCacheReadDirs (config, cache, sublist, set);
 877         free (file);
 878     }
 879     FcStrListDone (list);
 880     return ret;
 881 }
 882
 883 FcFontSet *
 884 FcCacheRead (FcConfig *config, FcGlobalCache * cache)
 885 {
 886     FcFontSet * s = FcFontSetCreate();
 887     if (!s)
 888         return 0;
 889
 890     if (FcCacheReadDirs (config, cache, FcConfigGetConfigDirs (config), s))
 891         goto bail;
 892
 893     return s;
 894
 895  bail:
 896     FcFontSetDestroy (s);
 897     return 0;
 898 }
 899
 900 static const char bin2hex[] = { '0', '1', '2', '3',
 901                                 '4', '5', '6', '7',
 902                                 '8', '9', 'a', 'b',
 903                                 'c', 'd', 'e', 'f' };
 904
 905 static char *
 906 FcDirCacheHashName (char * cache_file, int collisions)
 907 {
 908     unsigned char       hash[16], hex_hash[33];
 909     char                *cache_hashed;
 910     unsigned char       uscore = '_';
 911     int                 cnt, i;
 912     FcChar8             *tmp;
 913     struct MD5Context   ctx;
 914
 915     MD5Init (&ctx);
 916     MD5Update (&ctx, (unsigned char *)cache_file, strlen (cache_file));
 917
 918     for (i = 0; i < collisions; i++)
 919         MD5Update (&ctx, &uscore, 1);
 920
 921     MD5Final (hash, &ctx);
 922
 923     for (cnt = 0; cnt < 16; ++cnt)
 924     {
 925         hex_hash[2*cnt] = bin2hex[hash[cnt] >> 4];
 926         hex_hash[2*cnt+1] = bin2hex[hash[cnt] & 0xf];
 927     }
 928     hex_hash[32] = 0;
 929
 930     tmp = FcStrPlus ((FcChar8 *)hex_hash, (FcChar8 *)FC_CACHE_SUFFIX);
 931     if (!tmp)
 932         return 0;
 933
 934     cache_hashed = (char *)FcStrPlus ((FcChar8 *)PKGCACHEDIR"/", tmp);
 935     free (tmp);
 936
 937     return cache_hashed;
 938 }
 939
 940 /* Opens the hashed name for cache_file.
 941  * This would fail in the unlikely event of a collision and subsequent
 942  * removal of the file which originally caused the collision. */
 943 static int
 944 FcDirCacheOpen (const FcChar8 *dir)
 945 {
 946     FcBool      found;
 947     int         fd = -1, collisions = 0;
 948     char        *cache_file, *cache_hashed;
 949     char        name_buf[FC_MAX_FILE_LEN];
 950     struct stat dir_stat;
 951
 952     cache_file = (char *)FcStrPlus (dir, (FcChar8 *) "/" FC_DIR_CACHE_FILE);
 953     if (!cache_file)
 954         return -1;
 955
 956     fd = open(cache_file, O_RDONLY);
 957     if (fd != -1)
 958         return fd;
 959
 960     if (stat ((char *)dir, &dir_stat) == -1)
 961         return -1;
 962
 963     found = FcFalse;
 964     do
 965     {
 966         struct stat c;
 967         FcChar8 * name_buf_dir;
 968
 969         cache_hashed = FcDirCacheHashName (cache_file, collisions++);
 970         if (!cache_hashed)
 971         {
 972             FcStrFree ((FcChar8 *)cache_file);
 973             return -1;
 974         }
 975
 976         if (fd > 0)
 977             close (fd);
 978         fd = open(cache_hashed, O_RDONLY);
 979         FcStrFree ((FcChar8 *)cache_hashed);
 980
 981         if (fd == -1)
 982         {
 983             FcStrFree ((FcChar8 *)cache_file);
 984             return -1;
 985         }
 986         if (!FcCacheReadString (fd, name_buf, sizeof (name_buf)) || !strlen(name_buf))
 987             goto bail;
 988
 989         name_buf_dir = FcStrDirname ((FcChar8 *)name_buf);
 990         if (stat ((char *)name_buf_dir, &c) == -1)
 991         {
 992             FcStrFree (name_buf_dir);
 993             continue;
 994         }
 995         FcStrFree (name_buf_dir);
 996         found = (c.st_ino == dir_stat.st_ino) && (c.st_dev == dir_stat.st_dev);
 997     } while (!found);
 998     FcStrFree ((FcChar8 *)cache_file);
 999     return fd;
1000
1001  bail:
1002     FcStrFree ((FcChar8 *)cache_file);
1003     close (fd);
1004     return -1;
1005 }
1006
1007 /* read serialized state from the cache file */
1008 FcBool
1009 FcDirCacheRead (FcFontSet * set, FcStrSet * dirs, const FcChar8 *dir, FcConfig *config)
1010 {
1011     int         fd;
1012     char        *current_arch_machine_name;
1013     char        candidate_arch_machine_name[9+MACHINE_SIGNATURE_SIZE];
1014     off_t       current_arch_start = 0;
1015     char        subdirName[FC_MAX_FILE_LEN + 1 + 12 + 1];
1016
1017     fd = FcDirCacheOpen (dir);
1018     if (fd < 0)
1019         goto bail;
1020
1021     current_arch_machine_name = FcCacheMachineSignature();
1022     current_arch_start = FcCacheSkipToArch(fd,
1023                                            current_arch_machine_name);
1024     if (current_arch_start < 0)
1025         goto bail1;
1026
1027     lseek (fd, current_arch_start, SEEK_SET);
1028     if (FcCacheReadString (fd, candidate_arch_machine_name,
1029                            sizeof (candidate_arch_machine_name)) == 0)
1030         goto bail1;
1031
1032     while (FcCacheReadString (fd, subdirName, sizeof (subdirName)) && strlen (subdirName) > 0)
1033         FcStrSetAdd (dirs, (FcChar8 *)subdirName);
1034
1035     if (!FcDirCacheConsume (fd, (const char *)dir, set, config))
1036         goto bail1;
1037
1038     close(fd);
1039     return FcTrue;
1040
1041  bail1:
1042     close (fd);
1043  bail:
1044     return FcFalse;
1045 }
1046
1047 static FcBool
1048 FcDirCacheConsume (int fd, const char * dir, FcFontSet *set, FcConfig *config)
1049 {
1050     FcCache metadata;
1051     void * current_dir_block;
1052     off_t pos;
1053
1054     if (read(fd, &metadata, sizeof(FcCache)) != sizeof(FcCache))
1055         return FcFalse;
1056     if (metadata.magic != FC_CACHE_MAGIC)
1057         return FcFalse;
1058
1059     if (!metadata.count)
1060     {
1061         pos = FcCacheNextOffset (lseek(fd, 0, SEEK_CUR));
1062         lseek (fd, pos, SEEK_SET);
1063         if (config)
1064             FcConfigAddFontDir (config, (FcChar8 *)dir);
1065         return FcTrue;
1066     }
1067
1068     pos = FcCacheNextOffset (lseek(fd, 0, SEEK_CUR));
1069     current_dir_block = mmap (0, metadata.count,
1070                               PROT_READ, MAP_SHARED, fd, pos);
1071     lseek (fd, pos+metadata.count, SEEK_SET);
1072     if (current_dir_block == MAP_FAILED)
1073         return FcFalse;
1074
1075     FcCacheAddBankDir (metadata.bank, dir);
1076     if (config)
1077         FcConfigAddFontDir (config, (FcChar8 *)dir);
1078
1079     if (!FcFontSetUnserialize (&metadata, set, current_dir_block))
1080         return FcFalse;
1081
1082     return FcTrue;
1083 }
1084
1085 static void *
1086 FcDirCacheProduce (FcFontSet *set, FcCache *metadata)
1087 {
1088     void * current_dir_block, * final_dir_block;
1089     static unsigned int rand_state = 0;
1090     int bank, needed_bytes_no_align;
1091
1092     if (!rand_state)
1093         rand_state = time(0L);
1094     bank = rand_r(&rand_state);
1095
1096     while (FcCacheHaveBank(bank))
1097         bank = rand_r(&rand_state);
1098
1099     memset (metadata, 0, sizeof(FcCache));
1100     FcFontSetNewBank();
1101     needed_bytes_no_align = FcFontSetNeededBytes (set);
1102     metadata->count = needed_bytes_no_align +
1103         FcFontSetNeededBytesAlign ();
1104     metadata->magic = FC_CACHE_MAGIC;
1105     metadata->bank = bank;
1106
1107     if (!needed_bytes_no_align) /* not a failure, no fonts to write */
1108     {
1109         /* no, you don't really need to write any bytes at all. */
1110         metadata->count = 0;
1111         return 0;
1112     }
1113
1114     current_dir_block = malloc (metadata->count);
1115     if (!current_dir_block)
1116         goto bail;
1117     // shut up valgrind
1118     memset (current_dir_block, 0, metadata->count);
1119     final_dir_block = FcFontSetDistributeBytes (metadata, current_dir_block);
1120
1121     if ((void *)((char *)current_dir_block+metadata->count) < final_dir_block)
1122         goto bail;
1123
1124     if (!FcFontSetSerialize (bank, set))
1125         goto bail;
1126
1127     return current_dir_block;
1128
1129  bail:
1130     free (current_dir_block);
1131     return 0;
1132 }
1133
1134 /* write serialized state to the cache file */
1135 FcBool
1136 FcDirCacheWrite (FcFontSet *set, FcStrSet *dirs, const FcChar8 *dir)
1137 {
1138     char            *cache_file;
1139     char            *cache_hashed;
1140     int             fd, fd_orig, i, dirs_count;
1141     FcAtomic        *atomic;
1142     FcCache         metadata;
1143     off_t           current_arch_start = 0, truncate_to;
1144     char            name_buf[FC_MAX_FILE_LEN];
1145     int             collisions;
1146
1147     char            *current_arch_machine_name, * header;
1148     void            *current_dir_block = 0;
1149
1150     dir = FcConfigNormalizeFontDir (FcConfigGetCurrent(), dir);
1151     if (!dir)
1152         return FcFalse;
1153
1154     cache_file = (char *)FcStrPlus (dir, (FcChar8 *) "/" FC_DIR_CACHE_FILE);
1155     if (!cache_file)
1156         goto bail;
1157
1158     /* Ensure that we're not trampling a cache for some other dir. */
1159     /* This is slightly different from FcDirCacheOpen, since it
1160      * needs the filename, not the file descriptor. */
1161     fd = -1; collisions = 0;
1162     do
1163     {
1164         cache_hashed = FcDirCacheHashName (cache_file, collisions++);
1165         if (!cache_hashed)
1166             goto bail0;
1167
1168         if (fd > 0)
1169             close (fd);
1170         fd = open(cache_hashed, O_RDONLY);
1171         if (fd == -1)
1172             break;
1173         if(!FcCacheReadString (fd, name_buf, sizeof (name_buf)) || !strlen(name_buf))
1174         {
1175             close (fd);
1176             break;
1177         }
1178         close (fd);
1179
1180         if (strcmp (name_buf, cache_file) != 0)
1181             continue;
1182     } while (0);
1183
1184     current_dir_block = FcDirCacheProduce (set, &metadata);
1185
1186     if (metadata.count && !current_dir_block)
1187         goto bail1;
1188
1189     if (FcDebug () & FC_DBG_CACHE)
1190         printf ("FcDirCacheWriteDir cache_file \"%s\"\n", cache_file);
1191
1192     atomic = FcAtomicCreate ((FcChar8 *)cache_hashed);
1193     if (!atomic)
1194         goto bail1;
1195
1196     if (!FcAtomicLock (atomic))
1197     {
1198         /* Now try rewriting the original version of the file. */
1199         FcAtomicDestroy (atomic);
1200
1201         atomic = FcAtomicCreate ((FcChar8 *)cache_file);
1202         fd_orig = open (cache_file, O_RDONLY);
1203         if (fd_orig == -1)
1204             fd_orig = open((char *)FcAtomicOrigFile (atomic), O_RDONLY);
1205
1206         fd = open((char *)FcAtomicNewFile (atomic), O_RDWR | O_CREAT, 0666);
1207         if (fd == -1)
1208             goto bail2;
1209     }
1210
1211     /* In all cases, try opening the real location of the cache file first. */
1212     /* (even if that's not atomic.) */
1213     fd_orig = open (cache_file, O_RDONLY);
1214     if (fd_orig == -1)
1215         fd_orig = open((char *)FcAtomicOrigFile (atomic), O_RDONLY);
1216
1217     fd = open((char *)FcAtomicNewFile (atomic), O_RDWR | O_CREAT, 0666);
1218     if (fd == -1)
1219         goto bail3;
1220
1221     FcCacheWriteString (fd, cache_file);
1222
1223     current_arch_machine_name = FcCacheMachineSignature ();
1224     current_arch_start = 0;
1225
1226     if (fd_orig != -1)
1227         current_arch_start =
1228             FcCacheSkipToArch(fd_orig, current_arch_machine_name);
1229
1230     if (current_arch_start < 0)
1231     {
1232         off_t i = lseek(fd_orig, 0, SEEK_END);
1233         if (i < strlen (FC_GLOBAL_MAGIC_COOKIE)+1)
1234             i = strlen (FC_GLOBAL_MAGIC_COOKIE)+1;
1235         current_arch_start = FcCacheNextOffset (i);
1236     }
1237
1238     if (fd_orig != -1 && !FcCacheCopyOld(fd, fd_orig, current_arch_start))
1239         goto bail4;
1240
1241     if (fd_orig != -1)
1242         close (fd_orig);
1243
1244     current_arch_start = lseek(fd, 0, SEEK_CUR);
1245     if (ftruncate (fd, current_arch_start) == -1)
1246         goto bail4;
1247
1248     /* allocate space for subdir names in this block */
1249     dirs_count = 0;
1250     for (i = 0; i < dirs->size; i++)
1251         dirs_count += strlen((char *)dirs->strs[i]) + 1;
1252     dirs_count ++;
1253
1254     /* now write the address of the next offset */
1255     truncate_to = FcCacheNextOffset (FcCacheNextOffset (current_arch_start + sizeof (FcCache) + dirs_count) + metadata.count) - current_arch_start;
1256     header = malloc (10 + strlen (current_arch_machine_name));
1257     if (!header)
1258         goto bail4;
1259     sprintf (header, "%8x ", (int)truncate_to);
1260     strcat (header, current_arch_machine_name);
1261     if (!FcCacheWriteString (fd, header))
1262         goto bail5;
1263
1264     for (i = 0; i < dirs->size; i++)
1265         FcCacheWriteString (fd, (char *)dirs->strs[i]);
1266     FcCacheWriteString (fd, "");
1267
1268     if (write (fd, &metadata, sizeof(FcCache)) != sizeof(FcCache)) {
1269         perror("write metadata");
1270         goto bail5;
1271     }
1272     if (metadata.count)
1273     {
1274         off_t off = FcCacheNextOffset (lseek(fd, 0, SEEK_END));
1275         if (lseek (fd, off, SEEK_SET) != off)
1276             perror("lseek");
1277         else if (write (fd, current_dir_block, metadata.count) !=
1278                  metadata.count)
1279             perror("write current_dir_block");
1280         free (current_dir_block);
1281     }
1282
1283     /* this actually serves to pad out the cache file, if needed */
1284     if (ftruncate (fd, current_arch_start + truncate_to) == -1)
1285         goto bail5;
1286
1287     free (header);
1288     close(fd);
1289     if (!FcAtomicReplaceOrig(atomic))
1290         goto bail5;
1291     FcStrFree ((FcChar8 *)cache_hashed);
1292     FcStrFree ((FcChar8 *)cache_file);
1293     FcAtomicUnlock (atomic);
1294     FcAtomicDestroy (atomic);
1295     return FcTrue;
1296
1297  bail5:
1298     free (header);
1299  bail4:
1300     close (fd);
1301  bail3:
1302     FcAtomicUnlock (atomic);
1303  bail2:
1304     FcAtomicDestroy (atomic);
1305  bail1:
1306     FcStrFree ((FcChar8 *)cache_hashed);
1307  bail0:
1308     unlink ((char *)cache_file);
1309     FcStrFree ((FcChar8 *)cache_file);
1310     if (current_dir_block)
1311         free (current_dir_block);
1312  bail:
1313     return FcFalse;
1314 }
1315
1316 static char *
1317 FcCacheMachineSignature ()
1318 {
1319     static char buf[MACHINE_SIGNATURE_SIZE];
1320     int32_t magic = ENDIAN_TEST;
1321     char * m = (char *)&magic;
1322
1323     sprintf (buf, "%2x%2x%2x%2x "
1324              "%4x %4x %4x %4x %4x %4x %4x %4x %4x %4x %4x %4x "
1325              "%4x %4x %4x %4x %4x %4x %4x %4x\n",
1326              m[0], m[1], m[2], m[3],
1327              (unsigned int)sizeof (char),
1328              (unsigned int)sizeof (char *),
1329              (unsigned int)sizeof (int),
1330              (unsigned int)sizeof (FcPattern),
1331              (unsigned int)sizeof (FcPatternEltPtr),
1332              (unsigned int)sizeof (struct _FcPatternElt *),
1333              (unsigned int)sizeof (FcPatternElt),
1334              (unsigned int)sizeof (FcObjectPtr),
1335              (unsigned int)sizeof (FcValueListPtr),
1336              (unsigned int)sizeof (FcValue),
1337              (unsigned int)sizeof (FcValueBinding),
1338              (unsigned int)sizeof (struct _FcValueList *),
1339              (unsigned int)sizeof (FcCharSet),
1340              (unsigned int)sizeof (FcCharLeaf **),
1341              (unsigned int)sizeof (FcChar16 *),
1342              (unsigned int)sizeof (FcChar16),
1343              (unsigned int)sizeof (FcCharLeaf),
1344              (unsigned int)sizeof (FcChar32),
1345              (unsigned int)sizeof (FcCache),
1346              (unsigned int)sysconf(_SC_PAGESIZE));
1347
1348     return buf;
1349 }
1350
1351 static int banks_ptr = 0, banks_alloc = 0;
1352 int * _fcBankId = 0, * _fcBankIdx = 0;
1353 static const char ** bankDirs = 0;
1354
1355 static FcBool
1356 FcCacheHaveBank (int bank)
1357 {
1358     int i;
1359
1360     if (bank < FC_BANK_FIRST)
1361         return FcTrue;
1362
1363     for (i = 0; i < banks_ptr; i++)
1364         if (_fcBankId[i] == bank)
1365             return FcTrue;
1366
1367     return FcFalse;
1368 }
1369
1370 int
1371 FcCacheBankToIndexMTF (int bank)
1372 {
1373     int i, j;
1374
1375     for (i = 0; i < banks_ptr; i++)
1376         if (_fcBankId[_fcBankIdx[i]] == bank)
1377         {
1378             int t = _fcBankIdx[i];
1379
1380             for (j = i; j > 0; j--)
1381                 _fcBankIdx[j] = _fcBankIdx[j-1];
1382             _fcBankIdx[0] = t;
1383             return t;
1384         }
1385
1386     if (banks_ptr >= banks_alloc)
1387     {
1388         int * b, * bidx;
1389         const char ** bds;
1390
1391         b = realloc (_fcBankId, (banks_alloc + 4) * sizeof(int));
1392         if (!b)
1393             return -1;
1394         _fcBankId = b;
1395
1396         bidx = realloc (_fcBankIdx, (banks_alloc + 4) * sizeof(int));
1397         if (!bidx)
1398             return -1;
1399         _fcBankIdx = bidx;
1400
1401         bds = realloc (bankDirs, (banks_alloc + 4) * sizeof (char *));
1402         if (!bds)
1403             return -1;
1404         bankDirs = bds;
1405
1406         banks_alloc += 4;
1407     }
1408
1409     i = banks_ptr++;
1410     _fcBankId[i] = bank;
1411     _fcBankIdx[i] = i;
1412     return i;
1413 }
1414
1415 static void
1416 FcCacheAddBankDir (int bank, const char * dir)
1417 {
1418     int bi = FcCacheBankToIndexMTF (bank);
1419
1420     if (bi < 0)
1421         return;
1422
1423     bankDirs[bi] = (const char *)FcStrCopy ((FcChar8 *)dir);
1424 }
1425
1426 const char *
1427 FcCacheFindBankDir (int bank)
1428 {
1429     int bi = FcCacheBankToIndex (bank);
1430     return bankDirs[bi];
1431 }
1432
1433 /*
1434  * This code implements the MD5 message-digest algorithm.
1435  * The algorithm is due to Ron Rivest.  This code was
1436  * written by Colin Plumb in 1993, no copyright is claimed.
1437  * This code is in the public domain; do with it what you wish.
1438  *
1439  * Equivalent code is available from RSA Data Security, Inc.
1440  * This code has been tested against that, and is equivalent,
1441  * except that you don't need to include two pages of legalese
1442  * with every copy.
1443  *
1444  * To compute the message digest of a chunk of bytes, declare an
1445  * MD5Context structure, pass it to MD5Init, call MD5Update as
1446  * needed on buffers full of bytes, and then call MD5Final, which
1447  * will fill a supplied 16-byte array with the digest.
1448  */
1449
1450 #ifndef HIGHFIRST
1451 #define byteReverse(buf, len)   /* Nothing */
1452 #else
1453 /*
1454  * Note: this code is harmless on little-endian machines.
1455  */
1456 void byteReverse(unsigned char *buf, unsigned longs)
1457 {
1458     FcChar32 t;
1459     do {
1460         t = (FcChar32) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
1461             ((unsigned) buf[1] << 8 | buf[0]);
1462         *(FcChar32 *) buf = t;
1463         buf += 4;
1464     } while (--longs);
1465 }
1466 #endif
1467
1468 /*
1469  * Start MD5 accumulation.  Set bit count to 0 and buffer to mysterious
1470  * initialization constants.
1471  */
1472 static void MD5Init(struct MD5Context *ctx)
1473 {
1474     ctx->buf[0] = 0x67452301;
1475     ctx->buf[1] = 0xefcdab89;
1476     ctx->buf[2] = 0x98badcfe;
1477     ctx->buf[3] = 0x10325476;
1478
1479     ctx->bits[0] = 0;
1480     ctx->bits[1] = 0;
1481 }
1482
1483 /*
1484  * Update context to reflect the concatenation of another buffer full
1485  * of bytes.
1486  */
1487 static void MD5Update(struct MD5Context *ctx, unsigned char *buf, unsigned len)
1488 {
1489     FcChar32 t;
1490
1491     /* Update bitcount */
1492
1493     t = ctx->bits[0];
1494     if ((ctx->bits[0] = t + ((FcChar32) len << 3)) < t)
1495         ctx->bits[1]++;         /* Carry from low to high */
1496     ctx->bits[1] += len >> 29;
1497
1498     t = (t >> 3) & 0x3f;        /* Bytes already in shsInfo->data */
1499
1500     /* Handle any leading odd-sized chunks */
1501
1502     if (t) {
1503         unsigned char *p = (unsigned char *) ctx->in + t;
1504
1505         t = 64 - t;
1506         if (len < t) {
1507             memcpy(p, buf, len);
1508             return;
1509         }
1510         memcpy(p, buf, t);
1511         byteReverse(ctx->in, 16);
1512         MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
1513         buf += t;
1514         len -= t;
1515     }
1516     /* Process data in 64-byte chunks */
1517
1518     while (len >= 64) {
1519         memcpy(ctx->in, buf, 64);
1520         byteReverse(ctx->in, 16);
1521         MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
1522         buf += 64;
1523         len -= 64;
1524     }
1525
1526     /* Handle any remaining bytes of data. */
1527
1528     memcpy(ctx->in, buf, len);
1529 }
1530
1531 /*
1532  * Final wrapup - pad to 64-byte boundary with the bit pattern
1533  * 1 0* (64-bit count of bits processed, MSB-first)
1534  */
1535 static void MD5Final(unsigned char digest[16], struct MD5Context *ctx)
1536 {
1537     unsigned count;
1538     unsigned char *p;
1539
1540     /* Compute number of bytes mod 64 */
1541     count = (ctx->bits[0] >> 3) & 0x3F;
1542
1543     /* Set the first char of padding to 0x80.  This is safe since there is
1544        always at least one byte free */
1545     p = ctx->in + count;
1546     *p++ = 0x80;
1547
1548     /* Bytes of padding needed to make 64 bytes */
1549     count = 64 - 1 - count;
1550
1551     /* Pad out to 56 mod 64 */
1552     if (count < 8) {
1553         /* Two lots of padding:  Pad the first block to 64 bytes */
1554         memset(p, 0, count);
1555         byteReverse(ctx->in, 16);
1556         MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
1557
1558         /* Now fill the next block with 56 bytes */
1559         memset(ctx->in, 0, 56);
1560     } else {
1561         /* Pad block to 56 bytes */
1562         memset(p, 0, count - 8);
1563     }
1564     byteReverse(ctx->in, 14);
1565
1566     /* Append length in bits and transform */
1567     ((FcChar32 *) ctx->in)[14] = ctx->bits[0];
1568     ((FcChar32 *) ctx->in)[15] = ctx->bits[1];
1569
1570     MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
1571     byteReverse((unsigned char *) ctx->buf, 4);
1572     memcpy(digest, ctx->buf, 16);
1573     memset(ctx, 0, sizeof(ctx));        /* In case it's sensitive */
1574 }
1575
1576
1577 /* The four core functions - F1 is optimized somewhat */
1578
1579 /* #define F1(x, y, z) (x & y | ~x & z) */
1580 #define F1(x, y, z) (z ^ (x & (y ^ z)))
1581 #define F2(x, y, z) F1(z, x, y)
1582 #define F3(x, y, z) (x ^ y ^ z)
1583 #define F4(x, y, z) (y ^ (x | ~z))
1584
1585 /* This is the central step in the MD5 algorithm. */
1586 #define MD5STEP(f, w, x, y, z, data, s) \
1587         ( w += f(x, y, z) + data,  w = w<<s | w>>(32-s),  w += x )
1588
1589 /*
1590  * The core of the MD5 algorithm, this alters an existing MD5 hash to
1591  * reflect the addition of 16 longwords of new data.  MD5Update blocks
1592  * the data and converts bytes into longwords for this routine.
1593  */
1594 static void MD5Transform(FcChar32 buf[4], FcChar32 in[16])
1595 {
1596     register FcChar32 a, b, c, d;
1597
1598     a = buf[0];
1599     b = buf[1];
1600     c = buf[2];
1601     d = buf[3];
1602
1603     MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
1604     MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
1605     MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
1606     MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
1607     MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
1608     MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
1609     MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
1610     MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
1611     MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
1612     MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
1613     MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
1614     MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
1615     MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
1616     MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
1617     MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
1618     MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
1619
1620     MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
1621     MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
1622     MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
1623     MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
1624     MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
1625     MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
1626     MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
1627     MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
1628     MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
1629     MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
1630     MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
1631     MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
1632     MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
1633     MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
1634     MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
1635     MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
1636
1637     MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
1638     MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
1639     MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
1640     MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
1641     MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
1642     MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
1643     MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
1644     MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
1645     MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
1646     MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
1647     MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
1648     MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
1649     MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
1650     MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
1651     MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
1652     MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
1653
1654     MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
1655     MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
1656     MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
1657     MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
1658     MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
1659     MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
1660     MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
1661     MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
1662     MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
1663     MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
1664     MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
1665     MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
1666     MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
1667     MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
1668     MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
1669     MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
1670
1671     buf[0] += a;
1672     buf[1] += b;
1673     buf[2] += c;
1674     buf[3] += d;
1675 }