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 #ifndef O_BINARY
  40 #define O_BINARY 0
  41 #endif
  42
  43 static int
  44 FcDirCacheOpen (const FcChar8 * dir);
  45
  46 static char *
  47 FcDirCacheHashName (char * cache_file, int collisions);
  48
  49 static off_t
  50 FcCacheSkipToArch (int fd, const char * arch);
  51
  52 static FcBool
  53 FcCacheCopyOld (int fd, int fd_orig, off_t start);
  54
  55 static void *
  56 FcDirCacheProduce (FcFontSet *set, FcCache * metadata);
  57
  58 static FcBool
  59 FcDirCacheConsume (int fd, const char * dir, FcFontSet *set, FcConfig *config);
  60
  61 static int
  62 FcCacheNextOffset(off_t w);
  63
  64 static char *
  65 FcCacheMachineSignature (void);
  66
  67 static FcBool
  68 FcCacheHaveBank (int bank);
  69
  70 static void
  71 FcCacheAddBankDir (int bank, const char * dir);
  72
  73 struct MD5Context {
  74         FcChar32 buf[4];
  75         FcChar32 bits[2];
  76         unsigned char in[64];
  77 };
  78
  79 static void MD5Init(struct MD5Context *ctx);
  80 static void MD5Update(struct MD5Context *ctx, unsigned char *buf, unsigned len);
  81 static void MD5Final(unsigned char digest[16], struct MD5Context *ctx);
  82 static void MD5Transform(FcChar32 buf[4], FcChar32 in[16]);
  83
  84 #define FC_DBG_CACHE_REF    1024
  85
  86 static char *
  87 FcCacheReadString (int fd, char *dest, int len)
  88 {
  89     int    size;
  90     int    slen;
  91
  92     if (len == 0)
  93         return 0;
  94
  95     size = read (fd, dest, len-1);
  96
  97     if (size > 0)
  98     {
  99         dest[size] = '\0';
 100         slen = strlen (dest);
 101
 102         lseek (fd, slen - size + 1, SEEK_CUR);
 103         return slen < len ? dest : 0;
 104     }
 105
 106     return 0;
 107 }
 108
 109 static void
 110 FcCacheSkipString (int fd)
 111 {
 112     char buf[256];
 113     int  size;
 114     int  slen;
 115
 116     while ( (size = read (fd, buf, sizeof (buf)-1)) > 0)
 117     {
 118         buf [size] = '\0';
 119         slen = strlen (buf);
 120         if (slen < size)
 121         {
 122             lseek (fd, slen - size + 1, SEEK_CUR);
 123             return;
 124         }
 125     }
 126 }
 127
 128 static FcBool
 129 FcCacheWriteString (int fd, const char *chars)
 130 {
 131     if (write (fd, chars, strlen(chars)+1) != strlen(chars)+1)
 132         return FcFalse;
 133     return FcTrue;
 134 }
 135
 136 static void
 137 FcGlobalCacheDirDestroy (FcGlobalCacheDir *d)
 138 {
 139     FcStrSetDestroy (d->subdirs);
 140     FcMemFree (FC_MEM_STRING, strlen (d->name)+1);
 141     free (d->name);
 142     FcMemFree (FC_MEM_CACHE, sizeof (FcGlobalCacheDir));
 143     free (d);
 144 }
 145
 146 FcGlobalCache *
 147 FcGlobalCacheCreate (void)
 148 {
 149     FcGlobalCache   *cache;
 150
 151     cache = malloc (sizeof (FcGlobalCache));
 152     if (!cache)
 153         return 0;
 154     FcMemAlloc (FC_MEM_CACHE, sizeof (FcGlobalCache));
 155     cache->dirs = 0;
 156     cache->updated = FcFalse;
 157     cache->fd = -1;
 158     return cache;
 159 }
 160
 161 void
 162 FcGlobalCacheDestroy (FcGlobalCache *cache)
 163 {
 164     FcGlobalCacheDir    *d, *next;
 165
 166     for (d = cache->dirs; d; d = next)
 167     {
 168         next = d->next;
 169         FcGlobalCacheDirDestroy (d);
 170     }
 171     FcMemFree (FC_MEM_CACHE, sizeof (FcGlobalCache));
 172     free (cache);
 173 }
 174
 175 void
 176 FcGlobalCacheLoad (FcGlobalCache    *cache,
 177                    FcStrSet         *staleDirs,
 178                    const FcChar8    *cache_file,
 179                    FcConfig         *config)
 180 {
 181     char                name_buf[FC_MAX_FILE_LEN];
 182     FcGlobalCacheDir    *d, *next;
 183     FcFileTime          config_time = FcConfigModifiedTime (config);
 184     char                * current_arch_machine_name;
 185     char                candidate_arch_machine_name[MACHINE_SIGNATURE_SIZE + 9];
 186     off_t               current_arch_start;
 187
 188     struct stat         cache_stat, dir_stat;
 189     char                subdirName[FC_MAX_FILE_LEN + 1 + 12 + 1];
 190
 191     if (stat ((char *) cache_file, &cache_stat) < 0)
 192         return;
 193
 194     cache->fd = open ((char *) cache_file, O_RDONLY | O_BINARY);
 195     if (cache->fd == -1)
 196         return;
 197
 198     cache->updated = FcFalse;
 199
 200     if (!FcCacheReadString (cache->fd, name_buf, sizeof (name_buf)))
 201         goto bail_and_destroy;
 202     if (strcmp (name_buf, FC_GLOBAL_MAGIC_COOKIE) != 0)
 203         goto bail_and_destroy;
 204
 205     current_arch_machine_name = FcCacheMachineSignature ();
 206     current_arch_start = FcCacheSkipToArch(cache->fd,
 207                                            current_arch_machine_name);
 208     if (current_arch_start < 0)
 209         goto bail_and_destroy;
 210
 211     lseek (cache->fd, current_arch_start, SEEK_SET);
 212     if (!FcCacheReadString (cache->fd, candidate_arch_machine_name,
 213                             sizeof (candidate_arch_machine_name)))
 214         goto bail_and_destroy;
 215     if (strlen(candidate_arch_machine_name) == 0)
 216         goto bail_and_destroy;
 217
 218     while (1)
 219     {
 220         off_t targ;
 221
 222         if (!FcCacheReadString (cache->fd, name_buf, sizeof (name_buf)) ||
 223             !strlen(name_buf))
 224             break;
 225
 226         /* Directory must be older than the global cache file; also
 227            cache must be newer than the config file. */
 228         if (stat ((char *) name_buf, &dir_stat) < 0 ||
 229             dir_stat.st_mtime > cache_stat.st_mtime ||
 230             (config_time.set && cache_stat.st_mtime < config_time.time))
 231         {
 232             FcCache md;
 233             off_t off;
 234
 235             FcStrSetAdd (staleDirs, FcStrCopy ((FcChar8 *)name_buf));
 236
 237             /* skip subdirs */
 238             while (FcCacheReadString (cache->fd, subdirName,
 239                                       sizeof (subdirName)) &&
 240                    strlen (subdirName))
 241                 ;
 242
 243             if (read (cache->fd, &md, sizeof (FcCache)) != sizeof(FcCache))
 244             {
 245                 perror ("read metadata");
 246                 goto bail1;
 247             }
 248             off = FcCacheNextOffset (lseek(cache->fd, 0, SEEK_CUR)) + md.count;
 249             if (lseek (cache->fd, off, SEEK_SET) != off)
 250             {
 251                 perror ("lseek");
 252                 goto bail1;
 253             }
 254             continue;
 255         }
 256
 257         d = malloc (sizeof (FcGlobalCacheDir));
 258         if (!d)
 259             goto bail1;
 260
 261         d->next = cache->dirs;
 262         cache->dirs = d;
 263
 264         d->name = (char *)FcStrCopy ((FcChar8 *)name_buf);
 265         d->ent = 0;
 266         d->state = FcGCDirFileRead;
 267
 268         d->subdirs = FcStrSetCreate();
 269         do
 270         {
 271             if (!FcCacheReadString (cache->fd, subdirName,
 272                                     sizeof (subdirName)) ||
 273                 !strlen (subdirName))
 274                 break;
 275             FcStrSetAdd (d->subdirs, (FcChar8 *)subdirName);
 276         } while (1);
 277
 278         d->offset = lseek (cache->fd, 0, SEEK_CUR);
 279         if (read (cache->fd, &d->metadata, sizeof (FcCache)) != sizeof (FcCache))
 280             goto bail1;
 281         targ = FcCacheNextOffset (lseek(cache->fd, 0, SEEK_CUR)) + d->metadata.count;
 282         if (lseek (cache->fd, targ, SEEK_SET) != targ)
 283             goto bail1;
 284     }
 285     return;
 286
 287  bail1:
 288     for (d = cache->dirs; d; d = next)
 289     {
 290         next = d->next;
 291         free (d);
 292     }
 293     cache->dirs = 0;
 294
 295     close (cache->fd);
 296     cache->fd = -1;
 297     return;
 298
 299  bail_and_destroy:
 300     close (cache->fd);
 301     cache->fd = -1;
 302
 303     if (stat ((char *) cache_file, &cache_stat) == 0)
 304         unlink ((char *)cache_file);
 305
 306     return;
 307
 308 }
 309
 310 FcBool
 311 FcGlobalCacheReadDir (FcFontSet *set, FcStrSet *dirs, FcGlobalCache * cache, const char *dir, FcConfig *config)
 312 {
 313     FcGlobalCacheDir    *d;
 314     int                 i;
 315
 316     if (cache->fd == -1)
 317         return FcFalse;
 318
 319     if (!(dir = (char *)FcConfigNormalizeFontDir (config, (FcChar8 *)dir)))
 320         return FcFalse; /* non-existing directory */
 321
 322     for (d = cache->dirs; d; d = d->next)
 323     {
 324         if (strcmp (d->name, dir) == 0)
 325         {
 326             if (d->state == FcGCDirDisabled)
 327                 return FcFalse;
 328
 329             if (d->state == FcGCDirFileRead)
 330             {
 331                 lseek (cache->fd, d->offset, SEEK_SET);
 332                 if (!FcDirCacheConsume (cache->fd, d->name, set, config))
 333                     return FcFalse;
 334
 335                 for (i = 0; i < d->subdirs->num; i++)
 336                     FcStrSetAdd (dirs, (FcChar8 *)d->subdirs->strs[i]);
 337
 338                 d->state = FcGCDirConsumed;
 339             }
 340             return FcTrue;
 341         }
 342     }
 343
 344     return FcFalse;
 345 }
 346
 347 static FcGlobalCacheDir *
 348 FcGlobalCacheDirFind (FcGlobalCache *cache, const char *name)
 349 {
 350     FcGlobalCacheDir * d;
 351
 352     if (!cache || !name)
 353         return NULL;
 354
 355     for (d = cache->dirs; d; d = d->next)
 356         if (strcmp((const char *)d->name, (const char *)name) == 0)
 357             return d;
 358
 359     return NULL;
 360  }
 361
 362 FcBool
 363 FcGlobalCacheUpdate (FcGlobalCache  *cache,
 364                      FcStrSet       *dirs,
 365                      const char     *orig_name,
 366                      FcFontSet      *set,
 367                      FcConfig       *config)
 368 {
 369     FcGlobalCacheDir    *d;
 370     int                 i;
 371     const char *name;
 372
 373     name = (char *)FcConfigNormalizeFontDir (config, (FcChar8 *)orig_name);
 374     if (!name)
 375     {
 376         fprintf(stderr, "Invalid directory name %s\n", orig_name);
 377         return FcFalse;
 378     }
 379
 380     d = FcGlobalCacheDirFind (cache, name);
 381
 382     if (!d)
 383     {
 384         d = malloc (sizeof (FcGlobalCacheDir));
 385         if (!d)
 386             return FcFalse;
 387         d->next = cache->dirs;
 388         cache->dirs = d;
 389     } else {
 390         /* free old resources */
 391         FcStrFree ((FcChar8 *)d->name);
 392         free (d->ent);
 393         FcStrSetDestroy (d->subdirs);
 394     }
 395
 396     cache->updated = FcTrue;
 397
 398     d->name = (char *)FcStrCopy ((FcChar8 *)name);
 399     d->ent = FcDirCacheProduce (set, &d->metadata);
 400     d->offset = 0;
 401     d->subdirs = FcStrSetCreate();
 402     d->state = FcGCDirUpdated;
 403     for (i = 0; i < dirs->num; i++)
 404         FcStrSetAdd (d->subdirs, dirs->strs[i]);
 405     return FcTrue;
 406 }
 407
 408 FcBool
 409 FcGlobalCacheSave (FcGlobalCache    *cache,
 410                    const FcChar8    *cache_file,
 411                    FcConfig         *config)
 412 {
 413     int                 fd, fd_orig, i;
 414     FcGlobalCacheDir    *dir;
 415     FcAtomic            *atomic;
 416     off_t               current_arch_start = 0, truncate_to;
 417     char                * current_arch_machine_name, * header;
 418
 419     if (!cache->updated)
 420         return FcTrue;
 421
 422 #if defined (HAVE_GETUID) && defined (HAVE_GETEUID)
 423     /* Set-UID programs can't safely update the cache */
 424     if (getuid () != geteuid ())
 425         return FcFalse;
 426 #endif
 427
 428     atomic = FcAtomicCreate (cache_file);
 429     if (!atomic)
 430         return FcFalse;
 431
 432     if (!FcAtomicLock (atomic))
 433         goto bail1;
 434     fd = open ((char *) FcAtomicNewFile(atomic), O_RDWR | O_CREAT | O_BINARY,
 435                S_IRUSR | S_IWUSR);
 436     if (fd == -1)
 437         goto bail2;
 438     FcCacheWriteString (fd, FC_GLOBAL_MAGIC_COOKIE);
 439
 440     fd_orig = open ((char *) FcAtomicOrigFile(atomic), O_RDONLY | O_BINARY);
 441
 442     current_arch_machine_name = FcCacheMachineSignature ();
 443     if (fd_orig == -1)
 444         current_arch_start = 0;
 445     else
 446         current_arch_start = FcCacheSkipToArch (fd_orig,
 447                                                 current_arch_machine_name);
 448
 449     if (current_arch_start < 0)
 450     {
 451         off_t i = lseek(fd_orig, 0, SEEK_END);
 452         if (i < strlen (FC_GLOBAL_MAGIC_COOKIE)+1)
 453             i = strlen (FC_GLOBAL_MAGIC_COOKIE)+1;
 454         current_arch_start = FcCacheNextOffset (i);
 455     }
 456
 457     if (!FcCacheCopyOld(fd, fd_orig, current_arch_start))
 458         goto bail3;
 459
 460     current_arch_start = lseek(fd, 0, SEEK_CUR);
 461     if (ftruncate (fd, current_arch_start) == -1)
 462         goto bail3;
 463
 464     header = malloc (10 + strlen (current_arch_machine_name));
 465     if (!header)
 466         goto bail3;
 467
 468     truncate_to = current_arch_start + strlen(current_arch_machine_name) + 11;
 469     for (dir = cache->dirs; dir; dir = dir->next)
 470     {
 471         if (dir->state == FcGCDirDisabled)
 472             continue;
 473         truncate_to += strlen(dir->name) + 1;
 474         truncate_to += sizeof (FcCache);
 475         truncate_to = FcCacheNextOffset (truncate_to);
 476         truncate_to += dir->metadata.count;
 477
 478         for (i = 0; i < dir->subdirs->size; i++)
 479             truncate_to += strlen((char *)dir->subdirs->strs[i]) + 1;
 480         truncate_to ++;
 481     }
 482     truncate_to -= current_arch_start;
 483
 484     sprintf (header, "%8x ", (int)truncate_to);
 485     strcat (header, current_arch_machine_name);
 486     if (!FcCacheWriteString (fd, header))
 487         goto bail4;
 488
 489     for (dir = cache->dirs; dir; dir = dir->next)
 490     {
 491         const char * d;
 492         off_t off;
 493
 494         if (!dir->name || dir->state == FcGCDirDisabled)
 495             continue;
 496         d = (const char *)FcConfigNormalizeFontDir (config, (const FcChar8 *)dir->name);
 497         if (!d)
 498             continue;
 499
 500         if (dir->metadata.count && !dir->ent)
 501         {
 502             if (dir->state == FcGCDirUpdated || fd_orig < 0)
 503             {
 504                 fprintf(stderr, "Invalid metadata entry for %s, skipping...\n", d);
 505                 continue;
 506             }
 507             /* copy the old content */
 508             dir->ent = malloc (dir->metadata.count);
 509             if (!dir->ent)
 510             {
 511                 perror("malloc error");
 512                 continue;
 513             }
 514             off = FcCacheNextOffset (dir->offset + sizeof(FcCache));
 515             if (lseek (fd_orig, off, SEEK_SET) != off)
 516             {
 517                 perror("lseek");
 518                 free(dir->ent);
 519                 continue;
 520             }
 521             if (read (fd_orig, dir->ent, dir->metadata.count)
 522                 != dir->metadata.count)
 523             {
 524                 perror("read");
 525                 free(dir->ent);
 526                 continue;
 527             }
 528         }
 529
 530         FcCacheWriteString (fd, d);
 531
 532         for (i = 0; i < dir->subdirs->size; i++)
 533             FcCacheWriteString (fd, (char *)dir->subdirs->strs[i]);
 534         FcCacheWriteString (fd, "");
 535
 536         if (write (fd, &dir->metadata, sizeof(FcCache)) != sizeof(FcCache))
 537         {
 538             perror ("write metadata");
 539             free (dir->ent);
 540             continue;
 541         }
 542         off = FcCacheNextOffset (lseek(fd, 0, SEEK_CUR));
 543         if (lseek (fd, off, SEEK_SET) != off)
 544         {
 545             perror ("lseek");
 546             free (dir->ent);
 547             continue;
 548         }
 549         if (dir->metadata.count)
 550         {
 551             if (write (fd, dir->ent, dir->metadata.count) != dir->metadata.count)
 552             {
 553                 perror ("write dirent");
 554                 free (dir->ent);
 555                 continue;
 556             }
 557         }
 558         free (dir->ent);
 559     }
 560     FcCacheWriteString (fd, "");
 561
 562     if (close (fd) == -1)
 563         goto bail25;
 564
 565     close (fd_orig);
 566     fd_orig = -1;
 567
 568     if (!FcAtomicReplaceOrig (atomic))
 569         goto bail25;
 570
 571     FcAtomicUnlock (atomic);
 572     FcAtomicDestroy (atomic);
 573
 574     cache->updated = FcFalse;
 575     return FcTrue;
 576
 577  bail4:
 578     free (header);
 579  bail3:
 580     if (fd_orig != -1)
 581         close (fd_orig);
 582
 583     close (fd);
 584  bail25:
 585     FcAtomicDeleteNew (atomic);
 586  bail2:
 587     FcAtomicUnlock (atomic);
 588  bail1:
 589     FcAtomicDestroy (atomic);
 590     return FcFalse;
 591 }
 592
 593 /*
 594  * Find the next presumably-mmapable offset after the supplied file
 595  * position.
 596  */
 597 static int
 598 FcCacheNextOffset(off_t w)
 599 {
 600     static long pagesize = -1;
 601     if (pagesize == -1)
 602         pagesize = sysconf(_SC_PAGESIZE);
 603     if (w % pagesize == 0)
 604         return w;
 605     else
 606         return ((w / pagesize)+1)*pagesize;
 607 }
 608
 609 /* return the address of the segment for the provided arch,
 610  * or -1 if arch not found */
 611 static off_t
 612 FcCacheSkipToArch (int fd, const char * arch)
 613 {
 614     char candidate_arch_machine_name_count[MACHINE_SIGNATURE_SIZE + 9];
 615     char * candidate_arch;
 616     off_t current_arch_start = 0;
 617
 618     lseek (fd, 0, SEEK_SET);
 619     FcCacheSkipString (fd);
 620     current_arch_start = lseek (fd, 0, SEEK_CUR);
 621
 622     /* skip arches that are not the current arch */
 623     while (1)
 624     {
 625         long bs;
 626
 627         if (lseek (fd, current_arch_start, SEEK_SET) != current_arch_start)
 628             return -1;
 629
 630         if (FcCacheReadString (fd, candidate_arch_machine_name_count,
 631                                 sizeof (candidate_arch_machine_name_count)) == 0)
 632             return -1;
 633         if (!strlen(candidate_arch_machine_name_count))
 634             return -1;
 635         bs = strtol(candidate_arch_machine_name_count, &candidate_arch, 16);
 636
 637         // count = 0 should probably be distinguished from the !bs condition
 638         if (!bs || bs < strlen (candidate_arch_machine_name_count))
 639             return -1;
 640
 641         candidate_arch++; /* skip leading space */
 642
 643         if (strcmp (candidate_arch, arch)==0)
 644             return current_arch_start;
 645         current_arch_start += bs;
 646     }
 647
 648     return -1;
 649 }
 650
 651 /* Cuts out the segment at the file pointer (moves everything else
 652  * down to cover it), and leaves the file pointer at the end of the
 653  * file. */
 654 static FcBool
 655 FcCacheCopyOld (int fd, int fd_orig, off_t start)
 656 {
 657     char * buf = malloc (8192);
 658     char candidate_arch_machine_name[MACHINE_SIGNATURE_SIZE + 9];
 659     long bs;
 660     int c, bytes_skipped;
 661     off_t loc;
 662
 663     if (!buf)
 664         return FcFalse;
 665
 666     loc = 0;
 667     lseek (fd, 0, SEEK_SET); lseek (fd_orig, 0, SEEK_SET);
 668     FcCacheSkipString (fd); FcCacheSkipString (fd_orig);
 669     do
 670     {
 671         int b = 8192;
 672         if (loc + b > start)
 673             b = start - loc;
 674
 675         if ((c = read (fd_orig, buf, b)) <= 0)
 676             break;
 677         if (write (fd, buf, c) < 0)
 678             goto bail;
 679
 680         loc += c;
 681     }
 682     while (c > 0);
 683
 684     lseek (fd, start, SEEK_SET);
 685     if (FcCacheReadString (fd, candidate_arch_machine_name,
 686                            sizeof (candidate_arch_machine_name)) == 0)
 687         goto done;
 688     if (!strlen(candidate_arch_machine_name))
 689         goto done;
 690
 691     bs = strtol(candidate_arch_machine_name, 0, 16);
 692     if (bs == 0)
 693         goto done;
 694
 695     bytes_skipped = 0;
 696     do
 697     {
 698         lseek (fd, start+bs+bytes_skipped, SEEK_SET);
 699         if ((c = read (fd, buf, 8192)) <= 0)
 700             break;
 701         lseek (fd, start+bytes_skipped, SEEK_SET);
 702         if (write (fd, buf, c) < 0)
 703             goto bail;
 704         bytes_skipped += c;
 705     }
 706     while (c > 0);
 707     lseek (fd, start+bytes_skipped, SEEK_SET);
 708
 709  done:
 710     free (buf);
 711     return FcTrue;
 712
 713  bail:
 714     free (buf);
 715     return FcFalse;
 716 }
 717
 718 /* Does not check that the cache has the appropriate arch section. */
 719 /* Also, this can be fooled if the original location has a stale
 720  * cache, and the hashed location has an up-to-date cache.  Oh well,
 721  * sucks to be you in that case! */
 722 FcBool
 723 FcDirCacheValid (const FcChar8 *dir)
 724 {
 725     struct stat file_stat, dir_stat;
 726     int         fd;
 727
 728     if (stat ((char *) dir, &dir_stat) < 0)
 729         return FcFalse;
 730
 731     fd = FcDirCacheOpen (dir);
 732
 733     if (fd < 0)
 734         return FcFalse;
 735     if (fstat (fd, &file_stat) < 0)
 736         goto bail;
 737
 738     close (fd);
 739
 740     /*
 741      * If the directory has been modified more recently than
 742      * the cache file, the cache is not valid
 743      */
 744     if (dir_stat.st_mtime > file_stat.st_mtime)
 745         return FcFalse;
 746
 747     return FcTrue;
 748
 749  bail:
 750     close (fd);
 751     return FcFalse;
 752 }
 753
 754 /* Assumes that the cache file in 'dir' exists.
 755  * Checks that the cache has the appropriate arch section. */
 756 FcBool
 757 FcDirCacheHasCurrentArch (const FcChar8 *dir)
 758 {
 759     int         fd;
 760     off_t       current_arch_start;
 761     char        *current_arch_machine_name;
 762
 763     fd = FcDirCacheOpen (dir);
 764     if (fd < 0)
 765         goto bail;
 766
 767     current_arch_machine_name = FcCacheMachineSignature();
 768     current_arch_start = FcCacheSkipToArch(fd, current_arch_machine_name);
 769     close (fd);
 770
 771     if (current_arch_start < 0)
 772         return FcFalse;
 773
 774     return FcTrue;
 775
 776  bail:
 777     return FcFalse;
 778 }
 779
 780 FcBool
 781 FcDirCacheUnlink (const FcChar8 *dir, FcConfig *config)
 782 {
 783     char        *cache_file;
 784     char        *cache_hashed = 0;
 785     int         fd, collisions;
 786     struct stat cache_stat;
 787     char        name_buf[FC_MAX_FILE_LEN];
 788
 789     dir = FcConfigNormalizeFontDir (config, dir);
 790     cache_file = (char *)FcStrPlus (dir, (FcChar8 *) "/" FC_DIR_CACHE_FILE);
 791     if (!cache_file)
 792         return FcFalse;
 793
 794     /* First remove normal cache file. */
 795     if (stat ((char *) cache_file, &cache_stat) == 0)
 796         unlink ((char *)cache_file);
 797
 798     /* Next remove any applicable hashed files. */
 799     fd = -1; collisions = 0;
 800     do
 801     {
 802         if (cache_hashed)
 803             FcStrFree ((FcChar8 *)cache_hashed);
 804
 805         cache_hashed = FcDirCacheHashName (cache_file, collisions++);
 806         if (!cache_hashed)
 807             goto bail;
 808
 809         if (fd > 0)
 810             close (fd);
 811         fd = open(cache_hashed, O_RDONLY | O_BINARY);
 812         if (fd == -1)
 813         {
 814             FcStrFree ((FcChar8 *)cache_file);
 815             return FcTrue;
 816         }
 817
 818         if (!FcCacheReadString (fd, name_buf, sizeof (name_buf)) || !strlen(name_buf))
 819         {
 820             FcStrFree ((FcChar8 *)cache_hashed);
 821             goto bail;
 822         }
 823     } while (strcmp (name_buf, cache_file) != 0);
 824
 825     close (fd);
 826
 827     if (stat ((char *) cache_hashed, &cache_stat) == 0 &&
 828         unlink ((char *)cache_hashed) != 0)
 829     {
 830         FcStrFree ((FcChar8 *)cache_hashed);
 831         goto bail;
 832     }
 833
 834     FcStrFree ((FcChar8 *)cache_file);
 835     FcStrFree ((FcChar8 *)cache_hashed);
 836     return FcTrue;
 837
 838  bail:
 839     FcStrFree ((FcChar8 *)cache_file);
 840     return FcFalse;
 841 }
 842
 843 static int
 844 FcCacheReadDirs (FcConfig * config, FcGlobalCache * cache,
 845                  FcStrList *list, FcFontSet * set, FcStrSet *processed_dirs)
 846 {
 847     int                 ret = 0;
 848     FcChar8             *dir;
 849     FcStrSet            *subdirs;
 850     FcStrList           *sublist;
 851     struct stat         statb;
 852     FcGlobalCacheDir   *d;
 853
 854     /*
 855      * Read in the results from 'list'.
 856      */
 857     while ((dir = FcStrListNext (list)))
 858     {
 859         if (!FcConfigAcceptFilename (config, dir))
 860             continue;
 861
 862         /* Skip this directory if already updated
 863          * to avoid the looped directories via symlinks
 864          * Clearly a dir not in fonts.conf shouldn't be globally cached.
 865          */
 866         dir = (FcChar8 *)FcConfigNormalizeFontDir (config, dir);
 867         if (!dir)
 868             continue;
 869
 870         if (FcStrSetMember (processed_dirs, dir))
 871             continue;
 872         if (!FcStrSetAdd (processed_dirs, dir))
 873             continue;
 874
 875         subdirs = FcStrSetCreate ();
 876         if (!subdirs)
 877         {
 878             fprintf (stderr, "Can't create directory set\n");
 879             ret++;
 880             continue;
 881         }
 882
 883         if (access ((char *) dir, X_OK) < 0)
 884         {
 885             switch (errno) {
 886             case ENOENT:
 887             case ENOTDIR:
 888             case EACCES:
 889                 break;
 890             default:
 891                 fprintf (stderr, "\"%s\": ", dir);
 892                 perror ("");
 893                 ret++;
 894             }
 895             FcStrSetDestroy (subdirs);
 896             continue;
 897         }
 898         if (stat ((char *) dir, &statb) == -1)
 899         {
 900             fprintf (stderr, "\"%s\": ", dir);
 901             perror ("");
 902             FcStrSetDestroy (subdirs);
 903             ret++;
 904             continue;
 905         }
 906         if (!S_ISDIR (statb.st_mode))
 907         {
 908             fprintf (stderr, "\"%s\": not a directory, skipping\n", dir);
 909             FcStrSetDestroy (subdirs);
 910             continue;
 911         }
 912         if (FcDirCacheValid (dir) && FcDirCacheRead (set, subdirs, dir, config))
 913         {
 914             /* if an old entry is found in the global cache, disable it */
 915             if ((d = FcGlobalCacheDirFind (cache, (const char *)dir)) != NULL)
 916             {
 917                 d->state = FcGCDirDisabled;
 918                 /* save the updated config later without this entry */
 919                 cache->updated = FcTrue;
 920             }
 921         }
 922         else
 923         {
 924             if (FcDebug () & FC_DBG_FONTSET)
 925                 printf ("cache scan dir %s\n", dir);
 926
 927             FcDirScanConfig (set, subdirs, cache,
 928                              config->blanks, dir, FcFalse, config);
 929         }
 930         sublist = FcStrListCreate (subdirs);
 931         FcStrSetDestroy (subdirs);
 932         if (!sublist)
 933         {
 934             fprintf (stderr, "Can't create subdir list in \"%s\"\n", dir);
 935             ret++;
 936             continue;
 937         }
 938         ret += FcCacheReadDirs (config, cache, sublist, set, processed_dirs);
 939     }
 940     FcStrListDone (list);
 941     return ret;
 942 }
 943
 944 FcFontSet *
 945 FcCacheRead (FcConfig *config, FcGlobalCache * cache)
 946 {
 947     FcFontSet   *s = FcFontSetCreate();
 948     FcStrSet    *processed_dirs;
 949
 950     if (!s)
 951         return 0;
 952
 953     processed_dirs = FcStrSetCreate();
 954     if (!processed_dirs)
 955         goto bail;
 956
 957     if (FcCacheReadDirs (config, cache, FcConfigGetConfigDirs (config), s, processed_dirs))
 958         goto bail1;
 959
 960     FcStrSetDestroy (processed_dirs);
 961     return s;
 962
 963  bail1:
 964     FcStrSetDestroy (processed_dirs);
 965  bail:
 966     FcFontSetDestroy (s);
 967     return 0;
 968 }
 969
 970 static const char bin2hex[] = { '0', '1', '2', '3',
 971                                 '4', '5', '6', '7',
 972                                 '8', '9', 'a', 'b',
 973                                 'c', 'd', 'e', 'f' };
 974
 975 static char *
 976 FcDirCacheHashName (char * cache_file, int collisions)
 977 {
 978     unsigned char       hash[16], hex_hash[33];
 979     char                *cache_hashed;
 980     unsigned char       uscore = '_';
 981     int                 cnt, i;
 982     FcChar8             *tmp;
 983     struct MD5Context   ctx;
 984
 985     MD5Init (&ctx);
 986     MD5Update (&ctx, (unsigned char *)cache_file, strlen (cache_file));
 987
 988     for (i = 0; i < collisions; i++)
 989         MD5Update (&ctx, &uscore, 1);
 990
 991     MD5Final (hash, &ctx);
 992
 993     for (cnt = 0; cnt < 16; ++cnt)
 994     {
 995         hex_hash[2*cnt] = bin2hex[hash[cnt] >> 4];
 996         hex_hash[2*cnt+1] = bin2hex[hash[cnt] & 0xf];
 997     }
 998     hex_hash[32] = 0;
 999
1000     tmp = FcStrPlus ((FcChar8 *)hex_hash, (FcChar8 *)FC_CACHE_SUFFIX);
1001     if (!tmp)
1002         return 0;
1003
1004     cache_hashed = (char *)FcStrPlus ((FcChar8 *)PKGCACHEDIR"/", tmp);
1005     free (tmp);
1006
1007     return cache_hashed;
1008 }
1009
1010 /* Opens the hashed name for cache_file.
1011  * This would fail in the unlikely event of a collision and subsequent
1012  * removal of the file which originally caused the collision. */
1013 static int
1014 FcDirCacheOpen (const FcChar8 *dir)
1015 {
1016     FcBool      found;
1017     int         fd = -1, collisions = 0;
1018     char        *cache_file, *cache_hashed;
1019     char        name_buf[FC_MAX_FILE_LEN];
1020     struct stat dir_stat;
1021
1022     if (stat ((char *)dir, &dir_stat) == -1)
1023         return -1;
1024
1025     cache_file = (char *)FcStrPlus (dir, (FcChar8 *) "/" FC_DIR_CACHE_FILE);
1026     if (!cache_file)
1027         return -1;
1028
1029     found = FcFalse;
1030     do
1031     {
1032         struct stat     c;
1033         FcChar8         *name_buf_dir;
1034
1035         if (fd >= 0)
1036             close (fd);
1037
1038         cache_hashed = FcDirCacheHashName (cache_file, collisions++);
1039         if (!cache_hashed)
1040         {
1041             FcStrFree ((FcChar8 *)cache_file);
1042             return -1;
1043         }
1044
1045         fd = open(cache_hashed, O_RDONLY | O_BINARY);
1046         FcStrFree ((FcChar8 *)cache_hashed);
1047
1048         if (fd == -1)
1049             break;
1050         if (!FcCacheReadString (fd, name_buf, sizeof (name_buf)) ||
1051             !strlen(name_buf))
1052             break;
1053
1054         name_buf_dir = FcStrDirname ((FcChar8 *)name_buf);
1055         if (stat ((char *)name_buf_dir, &c) == -1)
1056         {
1057             FcStrFree (name_buf_dir);
1058             continue;
1059         }
1060         FcStrFree (name_buf_dir);
1061         found = (c.st_ino == dir_stat.st_ino) && (c.st_dev == dir_stat.st_dev);
1062     } while (!found);
1063
1064     if (!found || fd < 0)
1065     {
1066         if (fd >= 0)
1067             close (fd);
1068         fd = open(cache_file, O_RDONLY | O_BINARY);
1069     }
1070
1071     FcStrFree ((FcChar8 *)cache_file);
1072     return fd;
1073 }
1074
1075 /* read serialized state from the cache file */
1076 FcBool
1077 FcDirCacheRead (FcFontSet * set, FcStrSet * dirs, const FcChar8 *dir, FcConfig *config)
1078 {
1079     int         fd;
1080     char        *current_arch_machine_name;
1081     char        candidate_arch_machine_name[9+MACHINE_SIGNATURE_SIZE];
1082     off_t       current_arch_start = 0;
1083     char        subdirName[FC_MAX_FILE_LEN + 1 + 12 + 1];
1084
1085     fd = FcDirCacheOpen (dir);
1086     if (fd < 0)
1087         goto bail;
1088
1089     current_arch_machine_name = FcCacheMachineSignature();
1090     current_arch_start = FcCacheSkipToArch(fd,
1091                                            current_arch_machine_name);
1092     if (current_arch_start < 0)
1093         goto bail1;
1094
1095     lseek (fd, current_arch_start, SEEK_SET);
1096     if (FcCacheReadString (fd, candidate_arch_machine_name,
1097                            sizeof (candidate_arch_machine_name)) == 0)
1098         goto bail1;
1099
1100     while (FcCacheReadString (fd, subdirName, sizeof (subdirName)) && strlen (subdirName) > 0)
1101         FcStrSetAdd (dirs, (FcChar8 *)subdirName);
1102
1103     if (!FcDirCacheConsume (fd, (const char *)dir, set, config))
1104         goto bail1;
1105
1106     close(fd);
1107     return FcTrue;
1108
1109  bail1:
1110     close (fd);
1111  bail:
1112     return FcFalse;
1113 }
1114
1115 static FcBool
1116 FcDirCacheConsume (int fd, const char * dir, FcFontSet *set, FcConfig *config)
1117 {
1118     FcCache metadata;
1119     void * current_dir_block;
1120     off_t pos;
1121
1122     if (read(fd, &metadata, sizeof(FcCache)) != sizeof(FcCache))
1123         return FcFalse;
1124     if (metadata.magic != FC_CACHE_MAGIC)
1125         return FcFalse;
1126
1127     if (!metadata.count)
1128     {
1129         pos = FcCacheNextOffset (lseek(fd, 0, SEEK_CUR));
1130         lseek (fd, pos, SEEK_SET);
1131         if (config)
1132             FcConfigAddFontDir (config, (FcChar8 *)dir);
1133         return FcTrue;
1134     }
1135
1136     pos = FcCacheNextOffset (lseek(fd, 0, SEEK_CUR));
1137     current_dir_block = mmap (0, metadata.count,
1138                               PROT_READ, MAP_SHARED, fd, pos);
1139     lseek (fd, pos+metadata.count, SEEK_SET);
1140     if (current_dir_block == MAP_FAILED)
1141         return FcFalse;
1142
1143     FcCacheAddBankDir (metadata.bank, dir);
1144     if (config)
1145         FcConfigAddFontDir (config, (FcChar8 *)dir);
1146
1147     if (!FcFontSetUnserialize (&metadata, set, current_dir_block))
1148         return FcFalse;
1149
1150     return FcTrue;
1151 }
1152
1153 static void *
1154 FcDirCacheProduce (FcFontSet *set, FcCache *metadata)
1155 {
1156     void * current_dir_block, * final_dir_block;
1157     static unsigned int rand_state = 0;
1158     int bank, needed_bytes_no_align;
1159
1160     if (!rand_state)
1161         rand_state = time(0L);
1162     bank = rand_r(&rand_state);
1163
1164     while (FcCacheHaveBank(bank))
1165         bank = rand_r(&rand_state);
1166
1167     memset (metadata, 0, sizeof(FcCache));
1168     FcFontSetNewBank();
1169     needed_bytes_no_align = FcFontSetNeededBytes (set);
1170     metadata->count = needed_bytes_no_align +
1171         FcFontSetNeededBytesAlign ();
1172     metadata->magic = FC_CACHE_MAGIC;
1173     metadata->bank = bank;
1174
1175     if (!needed_bytes_no_align) /* not a failure, no fonts to write */
1176     {
1177         /* no, you don't really need to write any bytes at all. */
1178         metadata->count = 0;
1179         return 0;
1180     }
1181
1182     current_dir_block = malloc (metadata->count);
1183     if (!current_dir_block)
1184         goto bail;
1185     // shut up valgrind
1186     memset (current_dir_block, 0, metadata->count);
1187     final_dir_block = FcFontSetDistributeBytes (metadata, current_dir_block);
1188
1189     if ((void *)((char *)current_dir_block+metadata->count) < final_dir_block)
1190         goto bail;
1191
1192     if (!FcFontSetSerialize (bank, set))
1193         goto bail;
1194
1195     return current_dir_block;
1196
1197  bail:
1198     free (current_dir_block);
1199     return 0;
1200 }
1201
1202 /* write serialized state to the cache file */
1203 FcBool
1204 FcDirCacheWrite (FcFontSet *set, FcStrSet *dirs, const FcChar8 *dir)
1205 {
1206     char            *cache_file;
1207     char            *cache_hashed;
1208     int             fd, fd_orig, i, dirs_count;
1209     FcAtomic        *atomic;
1210     FcCache         metadata;
1211     off_t           current_arch_start = 0, truncate_to;
1212     char            name_buf[FC_MAX_FILE_LEN];
1213     int             collisions;
1214
1215     char            *current_arch_machine_name, * header;
1216     void            *current_dir_block = 0;
1217
1218     dir = FcConfigNormalizeFontDir (FcConfigGetCurrent(), dir);
1219     if (!dir)
1220         return FcFalse;
1221
1222     cache_file = (char *)FcStrPlus (dir, (FcChar8 *) "/" FC_DIR_CACHE_FILE);
1223     if (!cache_file)
1224         goto bail;
1225
1226     /* Ensure that we're not trampling a cache for some other dir. */
1227     /* This is slightly different from FcDirCacheOpen, since it
1228      * needs the filename, not the file descriptor. */
1229     fd = -1; collisions = 0;
1230     do
1231     {
1232         cache_hashed = FcDirCacheHashName (cache_file, collisions++);
1233         if (!cache_hashed)
1234             goto bail0;
1235
1236         if (fd > 0)
1237             close (fd);
1238         fd = open(cache_hashed, O_RDONLY | O_BINARY);
1239         if (fd == -1)
1240             break;
1241         if(!FcCacheReadString (fd, name_buf, sizeof (name_buf)) || !strlen(name_buf))
1242         {
1243             close (fd);
1244             continue;
1245         }
1246         close (fd);
1247
1248         if (strcmp (name_buf, cache_file) != 0)
1249             continue;
1250
1251         break;
1252     } while (1);
1253
1254     current_dir_block = FcDirCacheProduce (set, &metadata);
1255
1256     if (metadata.count && !current_dir_block)
1257         goto bail1;
1258
1259     if (FcDebug () & FC_DBG_CACHE)
1260         printf ("FcDirCacheWriteDir cache_file \"%s\"\n", cache_file);
1261
1262     atomic = FcAtomicCreate ((FcChar8 *)cache_hashed);
1263     if (!atomic)
1264         goto bail1;
1265
1266     if (!FcAtomicLock (atomic))
1267     {
1268         /* Now try rewriting the original version of the file. */
1269         FcAtomicDestroy (atomic);
1270
1271         atomic = FcAtomicCreate ((FcChar8 *)cache_file);
1272         fd_orig = open (cache_file, O_RDONLY | O_BINARY);
1273         if (fd_orig == -1)
1274             fd_orig = open((char *)FcAtomicOrigFile (atomic), O_RDONLY | O_BINARY);
1275
1276         fd = open((char *)FcAtomicNewFile (atomic), O_RDWR | O_CREAT | O_BINARY, 0666);
1277         if (fd == -1)
1278             goto bail2;
1279     }
1280
1281     /* In all cases, try opening the real location of the cache file first. */
1282     /* (even if that's not atomic.) */
1283     fd_orig = open (cache_file, O_RDONLY | O_BINARY);
1284     if (fd_orig == -1)
1285         fd_orig = open((char *)FcAtomicOrigFile (atomic), O_RDONLY | O_BINARY);
1286
1287     fd = open((char *)FcAtomicNewFile (atomic), O_RDWR | O_CREAT | O_BINARY, 0666);
1288     if (fd == -1)
1289         goto bail3;
1290
1291     FcCacheWriteString (fd, cache_file);
1292
1293     current_arch_machine_name = FcCacheMachineSignature ();
1294     current_arch_start = 0;
1295
1296     if (fd_orig != -1)
1297         current_arch_start =
1298             FcCacheSkipToArch(fd_orig, current_arch_machine_name);
1299
1300     if (current_arch_start < 0)
1301     {
1302         off_t i = lseek(fd_orig, 0, SEEK_END);
1303         current_arch_start = FcCacheNextOffset (i);
1304     }
1305
1306     if (fd_orig != -1 && !FcCacheCopyOld(fd, fd_orig, current_arch_start))
1307         goto bail4;
1308
1309     if (fd_orig != -1)
1310         close (fd_orig);
1311
1312     current_arch_start = lseek(fd, 0, SEEK_CUR);
1313     if (ftruncate (fd, current_arch_start) == -1)
1314         goto bail4;
1315
1316     /* allocate space for subdir names in this block */
1317     dirs_count = 0;
1318     for (i = 0; i < dirs->size; i++)
1319         dirs_count += strlen((char *)dirs->strs[i]) + 1;
1320     dirs_count ++;
1321
1322     /* now write the address of the next offset */
1323     truncate_to = FcCacheNextOffset (FcCacheNextOffset (current_arch_start + sizeof (FcCache) + dirs_count) + metadata.count) - current_arch_start;
1324     header = malloc (10 + strlen (current_arch_machine_name));
1325     if (!header)
1326         goto bail4;
1327     sprintf (header, "%8x ", (int)truncate_to);
1328     strcat (header, current_arch_machine_name);
1329     if (!FcCacheWriteString (fd, header))
1330         goto bail5;
1331
1332     for (i = 0; i < dirs->size; i++)
1333         FcCacheWriteString (fd, (char *)dirs->strs[i]);
1334     FcCacheWriteString (fd, "");
1335
1336     if (write (fd, &metadata, sizeof(FcCache)) != sizeof(FcCache))
1337     {
1338         perror("write metadata");
1339         goto bail5;
1340     }
1341     if (metadata.count)
1342     {
1343         off_t off = FcCacheNextOffset (lseek(fd, 0, SEEK_END));
1344         if (lseek (fd, off, SEEK_SET) != off)
1345             perror("lseek");
1346         else if (write (fd, current_dir_block, metadata.count) !=
1347                  metadata.count)
1348             perror("write current_dir_block");
1349         free (current_dir_block);
1350     }
1351
1352     /* this actually serves to pad out the cache file, if needed */
1353     if (ftruncate (fd, current_arch_start + truncate_to) == -1)
1354         goto bail5;
1355
1356     free (header);
1357     close(fd);
1358     if (!FcAtomicReplaceOrig(atomic))
1359         goto bail5;
1360     FcStrFree ((FcChar8 *)cache_hashed);
1361     FcStrFree ((FcChar8 *)cache_file);
1362     FcAtomicUnlock (atomic);
1363     FcAtomicDestroy (atomic);
1364     return FcTrue;
1365
1366  bail5:
1367     free (header);
1368  bail4:
1369     close (fd);
1370  bail3:
1371     FcAtomicUnlock (atomic);
1372  bail2:
1373     FcAtomicDestroy (atomic);
1374  bail1:
1375     FcStrFree ((FcChar8 *)cache_hashed);
1376  bail0:
1377     unlink ((char *)cache_file);
1378     FcStrFree ((FcChar8 *)cache_file);
1379     if (current_dir_block)
1380         free (current_dir_block);
1381  bail:
1382     return FcFalse;
1383 }
1384
1385 static char *
1386 FcCacheMachineSignature ()
1387 {
1388     static char buf[MACHINE_SIGNATURE_SIZE];
1389     int32_t magic = ENDIAN_TEST;
1390     char * m = (char *)&magic;
1391
1392     sprintf (buf, "%2x%2x%2x%2x "
1393              "%4x %4x %4x %4x %4x %4x %4x %4x %4x %4x %4x %4x "
1394              "%4x %4x %4x %4x %4x %4x %4x %4x\n",
1395              m[0], m[1], m[2], m[3],
1396              (unsigned int)sizeof (char),
1397              (unsigned int)sizeof (char *),
1398              (unsigned int)sizeof (int),
1399              (unsigned int)sizeof (FcPattern),
1400              (unsigned int)sizeof (FcPatternEltPtr),
1401              (unsigned int)sizeof (struct _FcPatternElt *),
1402              (unsigned int)sizeof (FcPatternElt),
1403              (unsigned int)sizeof (FcObjectPtr),
1404              (unsigned int)sizeof (FcValueListPtr),
1405              (unsigned int)sizeof (FcValue),
1406              (unsigned int)sizeof (FcValueBinding),
1407              (unsigned int)sizeof (struct _FcValueList *),
1408              (unsigned int)sizeof (FcCharSet),
1409              (unsigned int)sizeof (FcCharLeaf **),
1410              (unsigned int)sizeof (FcChar16 *),
1411              (unsigned int)sizeof (FcChar16),
1412              (unsigned int)sizeof (FcCharLeaf),
1413              (unsigned int)sizeof (FcChar32),
1414              (unsigned int)sizeof (FcCache),
1415              (unsigned int)sysconf(_SC_PAGESIZE));
1416
1417     return buf;
1418 }
1419
1420 static int banks_ptr = 0, banks_alloc = 0;
1421 int * _fcBankId = 0, * _fcBankIdx = 0;
1422 static const char ** bankDirs = 0;
1423
1424 static FcBool
1425 FcCacheHaveBank (int bank)
1426 {
1427     int i;
1428
1429     if (bank < FC_BANK_FIRST)
1430         return FcTrue;
1431
1432     for (i = 0; i < banks_ptr; i++)
1433         if (_fcBankId[i] == bank)
1434             return FcTrue;
1435
1436     return FcFalse;
1437 }
1438
1439 int
1440 FcCacheBankToIndexMTF (int bank)
1441 {
1442     int i, j;
1443
1444     for (i = 0; i < banks_ptr; i++)
1445         if (_fcBankId[_fcBankIdx[i]] == bank)
1446         {
1447             int t = _fcBankIdx[i];
1448
1449             for (j = i; j > 0; j--)
1450                 _fcBankIdx[j] = _fcBankIdx[j-1];
1451             _fcBankIdx[0] = t;
1452             return t;
1453         }
1454
1455     if (banks_ptr >= banks_alloc)
1456     {
1457         int * b, * bidx;
1458         const char ** bds;
1459
1460         b = realloc (_fcBankId, (banks_alloc + 4) * sizeof(int));
1461         if (!b)
1462             return -1;
1463         _fcBankId = b;
1464
1465         bidx = realloc (_fcBankIdx, (banks_alloc + 4) * sizeof(int));
1466         if (!bidx)
1467             return -1;
1468         _fcBankIdx = bidx;
1469
1470         bds = realloc (bankDirs, (banks_alloc + 4) * sizeof (char *));
1471         if (!bds)
1472             return -1;
1473         bankDirs = bds;
1474
1475         banks_alloc += 4;
1476     }
1477
1478     i = banks_ptr++;
1479     _fcBankId[i] = bank;
1480     _fcBankIdx[i] = i;
1481     return i;
1482 }
1483
1484 static void
1485 FcCacheAddBankDir (int bank, const char * dir)
1486 {
1487     int bi = FcCacheBankToIndexMTF (bank);
1488
1489     if (bi < 0)
1490         return;
1491
1492     bankDirs[bi] = (const char *)FcStrCopy ((FcChar8 *)dir);
1493 }
1494
1495 const char *
1496 FcCacheFindBankDir (int bank)
1497 {
1498     int bi = FcCacheBankToIndex (bank);
1499     return bankDirs[bi];
1500 }
1501
1502 /*
1503  * This code implements the MD5 message-digest algorithm.
1504  * The algorithm is due to Ron Rivest.  This code was
1505  * written by Colin Plumb in 1993, no copyright is claimed.
1506  * This code is in the public domain; do with it what you wish.
1507  *
1508  * Equivalent code is available from RSA Data Security, Inc.
1509  * This code has been tested against that, and is equivalent,
1510  * except that you don't need to include two pages of legalese
1511  * with every copy.
1512  *
1513  * To compute the message digest of a chunk of bytes, declare an
1514  * MD5Context structure, pass it to MD5Init, call MD5Update as
1515  * needed on buffers full of bytes, and then call MD5Final, which
1516  * will fill a supplied 16-byte array with the digest.
1517  */
1518
1519 #ifndef HIGHFIRST
1520 #define byteReverse(buf, len)   /* Nothing */
1521 #else
1522 /*
1523  * Note: this code is harmless on little-endian machines.
1524  */
1525 void byteReverse(unsigned char *buf, unsigned longs)
1526 {
1527     FcChar32 t;
1528     do {
1529         t = (FcChar32) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
1530             ((unsigned) buf[1] << 8 | buf[0]);
1531         *(FcChar32 *) buf = t;
1532         buf += 4;
1533     } while (--longs);
1534 }
1535 #endif
1536
1537 /*
1538  * Start MD5 accumulation.  Set bit count to 0 and buffer to mysterious
1539  * initialization constants.
1540  */
1541 static void MD5Init(struct MD5Context *ctx)
1542 {
1543     ctx->buf[0] = 0x67452301;
1544     ctx->buf[1] = 0xefcdab89;
1545     ctx->buf[2] = 0x98badcfe;
1546     ctx->buf[3] = 0x10325476;
1547
1548     ctx->bits[0] = 0;
1549     ctx->bits[1] = 0;
1550 }
1551
1552 /*
1553  * Update context to reflect the concatenation of another buffer full
1554  * of bytes.
1555  */
1556 static void MD5Update(struct MD5Context *ctx, unsigned char *buf, unsigned len)
1557 {
1558     FcChar32 t;
1559
1560     /* Update bitcount */
1561
1562     t = ctx->bits[0];
1563     if ((ctx->bits[0] = t + ((FcChar32) len << 3)) < t)
1564         ctx->bits[1]++;         /* Carry from low to high */
1565     ctx->bits[1] += len >> 29;
1566
1567     t = (t >> 3) & 0x3f;        /* Bytes already in shsInfo->data */
1568
1569     /* Handle any leading odd-sized chunks */
1570
1571     if (t) {
1572         unsigned char *p = (unsigned char *) ctx->in + t;
1573
1574         t = 64 - t;
1575         if (len < t) {
1576             memcpy(p, buf, len);
1577             return;
1578         }
1579         memcpy(p, buf, t);
1580         byteReverse(ctx->in, 16);
1581         MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
1582         buf += t;
1583         len -= t;
1584     }
1585     /* Process data in 64-byte chunks */
1586
1587     while (len >= 64) {
1588         memcpy(ctx->in, buf, 64);
1589         byteReverse(ctx->in, 16);
1590         MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
1591         buf += 64;
1592         len -= 64;
1593     }
1594
1595     /* Handle any remaining bytes of data. */
1596
1597     memcpy(ctx->in, buf, len);
1598 }
1599
1600 /*
1601  * Final wrapup - pad to 64-byte boundary with the bit pattern
1602  * 1 0* (64-bit count of bits processed, MSB-first)
1603  */
1604 static void MD5Final(unsigned char digest[16], struct MD5Context *ctx)
1605 {
1606     unsigned count;
1607     unsigned char *p;
1608
1609     /* Compute number of bytes mod 64 */
1610     count = (ctx->bits[0] >> 3) & 0x3F;
1611
1612     /* Set the first char of padding to 0x80.  This is safe since there is
1613        always at least one byte free */
1614     p = ctx->in + count;
1615     *p++ = 0x80;
1616
1617     /* Bytes of padding needed to make 64 bytes */
1618     count = 64 - 1 - count;
1619
1620     /* Pad out to 56 mod 64 */
1621     if (count < 8) {
1622         /* Two lots of padding:  Pad the first block to 64 bytes */
1623         memset(p, 0, count);
1624         byteReverse(ctx->in, 16);
1625         MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
1626
1627         /* Now fill the next block with 56 bytes */
1628         memset(ctx->in, 0, 56);
1629     } else {
1630         /* Pad block to 56 bytes */
1631         memset(p, 0, count - 8);
1632     }
1633     byteReverse(ctx->in, 14);
1634
1635     /* Append length in bits and transform */
1636     ((FcChar32 *) ctx->in)[14] = ctx->bits[0];
1637     ((FcChar32 *) ctx->in)[15] = ctx->bits[1];
1638
1639     MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
1640     byteReverse((unsigned char *) ctx->buf, 4);
1641     memcpy(digest, ctx->buf, 16);
1642     memset(ctx, 0, sizeof(ctx));        /* In case it's sensitive */
1643 }
1644
1645
1646 /* The four core functions - F1 is optimized somewhat */
1647
1648 /* #define F1(x, y, z) (x & y | ~x & z) */
1649 #define F1(x, y, z) (z ^ (x & (y ^ z)))
1650 #define F2(x, y, z) F1(z, x, y)
1651 #define F3(x, y, z) (x ^ y ^ z)
1652 #define F4(x, y, z) (y ^ (x | ~z))
1653
1654 /* This is the central step in the MD5 algorithm. */
1655 #define MD5STEP(f, w, x, y, z, data, s) \
1656         ( w += f(x, y, z) + data,  w = w<<s | w>>(32-s),  w += x )
1657
1658 /*
1659  * The core of the MD5 algorithm, this alters an existing MD5 hash to
1660  * reflect the addition of 16 longwords of new data.  MD5Update blocks
1661  * the data and converts bytes into longwords for this routine.
1662  */
1663 static void MD5Transform(FcChar32 buf[4], FcChar32 in[16])
1664 {
1665     register FcChar32 a, b, c, d;
1666
1667     a = buf[0];
1668     b = buf[1];
1669     c = buf[2];
1670     d = buf[3];
1671
1672     MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
1673     MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
1674     MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
1675     MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
1676     MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
1677     MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
1678     MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
1679     MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
1680     MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
1681     MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
1682     MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
1683     MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
1684     MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
1685     MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
1686     MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
1687     MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
1688
1689     MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
1690     MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
1691     MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
1692     MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
1693     MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
1694     MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
1695     MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
1696     MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
1697     MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
1698     MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
1699     MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
1700     MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
1701     MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
1702     MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
1703     MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
1704     MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
1705
1706     MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
1707     MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
1708     MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
1709     MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
1710     MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
1711     MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
1712     MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
1713     MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
1714     MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
1715     MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
1716     MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
1717     MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
1718     MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
1719     MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
1720     MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
1721     MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
1722
1723     MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
1724     MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
1725     MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
1726     MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
1727     MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
1728     MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
1729     MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
1730     MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
1731     MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
1732     MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
1733     MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
1734     MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
1735     MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
1736     MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
1737     MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
1738     MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
1739
1740     buf[0] += a;
1741     buf[1] += b;
1742     buf[2] += c;
1743     buf[3] += d;
1744 }