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/types.h>
  30 #include <unistd.h>
  31 #include "fcint.h"
  32 #include <unistd.h>
  33 #if defined(HAVE_MMAP) || defined(__CYGWIN__)
  34 #  include <sys/mman.h>
  35 #  include <sys/utsname.h>
  36 #endif
  37
  38 #define ENDIAN_TEST 0x12345678
  39 #define MACHINE_SIGNATURE_SIZE (9 + 5*20 + 1)
  40 /* for when we don't have sysconf: */
  41 #define FC_HARDCODED_PAGESIZE 8192
  42
  43 #ifndef O_BINARY
  44 #define O_BINARY 0
  45 #endif
  46
  47 static int
  48 FcDirCacheOpen (const FcChar8 * dir);
  49
  50 static char *
  51 FcDirCacheHashName (char * cache_file, int collisions);
  52
  53 static off_t
  54 FcCacheSkipToArch (int fd, const char * arch);
  55
  56 static FcBool
  57 FcCacheCopyOld (int fd, int fd_orig, off_t start);
  58
  59 static void *
  60 FcDirCacheProduce (FcFontSet *set, FcCache * metadata);
  61
  62 static FcBool
  63 FcDirCacheConsume (int fd, const char * dir, FcFontSet *set, FcConfig *config);
  64
  65 static int
  66 FcCacheNextOffset(off_t w);
  67
  68 static char *
  69 FcCacheMachineSignature (void);
  70
  71 static FcBool
  72 FcCacheHaveBank (int bank);
  73
  74 static void
  75 FcCacheAddBankDir (int bank, const char * dir);
  76
  77 struct MD5Context {
  78         FcChar32 buf[4];
  79         FcChar32 bits[2];
  80         unsigned char in[64];
  81 };
  82
  83 static void MD5Init(struct MD5Context *ctx);
  84 static void MD5Update(struct MD5Context *ctx, unsigned char *buf, unsigned len);
  85 static void MD5Final(unsigned char digest[16], struct MD5Context *ctx);
  86 static void MD5Transform(FcChar32 buf[4], FcChar32 in[16]);
  87
  88 #define FC_DBG_CACHE_REF    1024
  89
  90 static char *
  91 FcCacheReadString (int fd, char *dest, int len)
  92 {
  93     int    size;
  94     int    slen;
  95
  96     if (len == 0)
  97         return 0;
  98
  99     size = read (fd, dest, len-1);
 100
 101     if (size > 0)
 102     {
 103         dest[size] = '\0';
 104         slen = strlen (dest);
 105
 106         lseek (fd, slen - size + 1, SEEK_CUR);
 107         return slen < len ? dest : 0;
 108     }
 109
 110     return 0;
 111 }
 112
 113 static void
 114 FcCacheSkipString (int fd)
 115 {
 116     char buf[256];
 117     int  size;
 118     int  slen;
 119
 120     while ( (size = read (fd, buf, sizeof (buf)-1)) > 0)
 121     {
 122         buf [size] = '\0';
 123         slen = strlen (buf);
 124         if (slen < size)
 125         {
 126             lseek (fd, slen - size + 1, SEEK_CUR);
 127             return;
 128         }
 129     }
 130 }
 131
 132 static FcBool
 133 FcCacheWriteString (int fd, const char *chars)
 134 {
 135     if (write (fd, chars, strlen(chars)+1) != strlen(chars)+1)
 136         return FcFalse;
 137     return FcTrue;
 138 }
 139
 140 static void
 141 FcGlobalCacheDirDestroy (FcGlobalCacheDir *d)
 142 {
 143     FcStrSetDestroy (d->subdirs);
 144     FcMemFree (FC_MEM_STRING, strlen (d->name)+1);
 145     free (d->name);
 146     FcMemFree (FC_MEM_CACHE, sizeof (FcGlobalCacheDir));
 147     free (d);
 148 }
 149
 150 FcGlobalCache *
 151 FcGlobalCacheCreate (void)
 152 {
 153     FcGlobalCache   *cache;
 154
 155     cache = malloc (sizeof (FcGlobalCache));
 156     if (!cache)
 157         return 0;
 158     FcMemAlloc (FC_MEM_CACHE, sizeof (FcGlobalCache));
 159     cache->dirs = 0;
 160     cache->updated = FcFalse;
 161     cache->fd = -1;
 162     return cache;
 163 }
 164
 165 void
 166 FcGlobalCacheDestroy (FcGlobalCache *cache)
 167 {
 168     FcGlobalCacheDir    *d, *next;
 169
 170     for (d = cache->dirs; d; d = next)
 171     {
 172         next = d->next;
 173         FcGlobalCacheDirDestroy (d);
 174     }
 175     FcMemFree (FC_MEM_CACHE, sizeof (FcGlobalCache));
 176     free (cache);
 177 }
 178
 179 void
 180 FcGlobalCacheLoad (FcGlobalCache    *cache,
 181                    FcStrSet         *staleDirs,
 182                    const FcChar8    *cache_file,
 183                    FcConfig         *config)
 184 {
 185     char                name_buf[FC_MAX_FILE_LEN];
 186     FcGlobalCacheDir    *d, *next;
 187     FcFileTime          config_time = FcConfigModifiedTime (config);
 188     char                * current_arch_machine_name;
 189     char                candidate_arch_machine_name[MACHINE_SIGNATURE_SIZE + 9];
 190     off_t               current_arch_start;
 191
 192     struct stat         cache_stat, dir_stat;
 193     char                subdirName[FC_MAX_FILE_LEN + 1 + 12 + 1];
 194
 195     if (stat ((char *) cache_file, &cache_stat) < 0)
 196         return;
 197
 198     cache->fd = open ((char *) cache_file, O_RDONLY | O_BINARY);
 199     if (cache->fd == -1)
 200         return;
 201
 202     cache->updated = FcFalse;
 203
 204     if (!FcCacheReadString (cache->fd, name_buf, sizeof (name_buf)))
 205         goto bail_and_destroy;
 206     if (strcmp (name_buf, FC_GLOBAL_MAGIC_COOKIE) != 0)
 207         goto bail_and_destroy;
 208
 209     current_arch_machine_name = FcCacheMachineSignature ();
 210     current_arch_start = FcCacheSkipToArch(cache->fd,
 211                                            current_arch_machine_name);
 212     if (current_arch_start < 0)
 213         goto bail1;
 214
 215     lseek (cache->fd, current_arch_start, SEEK_SET);
 216     if (!FcCacheReadString (cache->fd, candidate_arch_machine_name,
 217                             sizeof (candidate_arch_machine_name)))
 218         goto bail_and_destroy;
 219     if (strlen(candidate_arch_machine_name) == 0)
 220         goto bail_and_destroy;
 221
 222     while (1)
 223     {
 224         off_t targ;
 225
 226         if (!FcCacheReadString (cache->fd, name_buf, sizeof (name_buf)) ||
 227             !strlen(name_buf))
 228             break;
 229
 230         /* Directory must be older than the global cache file; also
 231            cache must be newer than the config file. */
 232         if (stat ((char *) name_buf, &dir_stat) < 0 ||
 233             dir_stat.st_mtime > cache_stat.st_mtime ||
 234             (config_time.set && cache_stat.st_mtime < config_time.time))
 235         {
 236             FcCache md;
 237             off_t off;
 238
 239             FcStrSetAdd (staleDirs, (FcChar8 *)name_buf);
 240
 241             /* skip subdirs */
 242             while (FcCacheReadString (cache->fd, subdirName,
 243                                       sizeof (subdirName)) &&
 244                    strlen (subdirName))
 245                 ;
 246
 247             if (read (cache->fd, &md, sizeof (FcCache)) != sizeof(FcCache))
 248             {
 249                 perror ("read metadata");
 250                 goto bail1;
 251             }
 252             off = FcCacheNextOffset (lseek(cache->fd, 0, SEEK_CUR)) + md.count;
 253             if (lseek (cache->fd, off, SEEK_SET) != off)
 254             {
 255                 perror ("lseek");
 256                 goto bail1;
 257             }
 258             continue;
 259         }
 260
 261         d = malloc (sizeof (FcGlobalCacheDir));
 262         if (!d)
 263             goto bail1;
 264
 265         d->next = cache->dirs;
 266         cache->dirs = d;
 267
 268         d->name = (char *)FcStrCopy ((FcChar8 *)name_buf);
 269         d->ent = 0;
 270         d->state = FcGCDirFileRead;
 271
 272         d->subdirs = FcStrSetCreate();
 273         do
 274         {
 275             if (!FcCacheReadString (cache->fd, subdirName,
 276                                     sizeof (subdirName)) ||
 277                 !strlen (subdirName))
 278                 break;
 279             FcStrSetAdd (d->subdirs, (FcChar8 *)subdirName);
 280         } while (1);
 281
 282         d->offset = lseek (cache->fd, 0, SEEK_CUR);
 283         if (read (cache->fd, &d->metadata, sizeof (FcCache)) != sizeof (FcCache))
 284             goto bail1;
 285         targ = FcCacheNextOffset (lseek(cache->fd, 0, SEEK_CUR)) + d->metadata.count;
 286         if (lseek (cache->fd, targ, SEEK_SET) != targ)
 287             goto bail1;
 288     }
 289     return;
 290
 291  bail1:
 292     for (d = cache->dirs; d; d = next)
 293     {
 294         next = d->next;
 295         free (d);
 296     }
 297     cache->dirs = 0;
 298
 299     close (cache->fd);
 300     cache->fd = -1;
 301     return;
 302
 303  bail_and_destroy:
 304     close (cache->fd);
 305     cache->fd = -1;
 306
 307     if (stat ((char *) cache_file, &cache_stat) == 0)
 308         unlink ((char *)cache_file);
 309
 310     return;
 311
 312 }
 313
 314 FcBool
 315 FcGlobalCacheReadDir (FcFontSet *set, FcStrSet *dirs, FcGlobalCache * cache, const char *dir, FcConfig *config)
 316 {
 317     FcGlobalCacheDir    *d;
 318     int                 i;
 319
 320     if (cache->fd == -1)
 321         return FcFalse;
 322
 323     if (!(dir = (char *)FcConfigNormalizeFontDir (config, (FcChar8 *)dir)))
 324         return FcFalse; /* non-existing directory */
 325
 326     for (d = cache->dirs; d; d = d->next)
 327     {
 328         if (strcmp (d->name, dir) == 0)
 329         {
 330             if (d->state == FcGCDirDisabled)
 331                 return FcFalse;
 332
 333             if (d->state == FcGCDirFileRead)
 334             {
 335                 lseek (cache->fd, d->offset, SEEK_SET);
 336                 if (!FcDirCacheConsume (cache->fd, d->name, set, config))
 337                     return FcFalse;
 338
 339                 for (i = 0; i < d->subdirs->num; i++)
 340                     FcStrSetAdd (dirs, (FcChar8 *)d->subdirs->strs[i]);
 341
 342                 d->state = FcGCDirConsumed;
 343             }
 344             return FcTrue;
 345         }
 346     }
 347
 348     return FcFalse;
 349 }
 350
 351 static FcGlobalCacheDir *
 352 FcGlobalCacheDirFind (FcGlobalCache *cache, const char *name)
 353 {
 354     FcGlobalCacheDir * d;
 355
 356     if (!cache || !name)
 357         return NULL;
 358
 359     for (d = cache->dirs; d; d = d->next)
 360         if (strcmp((const char *)d->name, (const char *)name) == 0)
 361             return d;
 362
 363     return NULL;
 364  }
 365
 366 FcBool
 367 FcGlobalCacheUpdate (FcGlobalCache  *cache,
 368                      FcStrSet       *dirs,
 369                      const char     *orig_name,
 370                      FcFontSet      *set,
 371                      FcConfig       *config)
 372 {
 373     FcGlobalCacheDir    *d;
 374     int                 i;
 375     const char *name;
 376
 377     name = (char *)FcConfigNormalizeFontDir (config, (FcChar8 *)orig_name);
 378     if (!name)
 379     {
 380         fprintf(stderr, "Invalid directory name %s\n", orig_name);
 381         return FcFalse;
 382     }
 383
 384     d = FcGlobalCacheDirFind (cache, name);
 385
 386     if (!d)
 387     {
 388         d = malloc (sizeof (FcGlobalCacheDir));
 389         if (!d)
 390             return FcFalse;
 391         d->next = cache->dirs;
 392         cache->dirs = d;
 393     } else {
 394         /* free old resources */
 395         FcStrFree ((FcChar8 *)d->name);
 396         free (d->ent);
 397         FcStrSetDestroy (d->subdirs);
 398     }
 399
 400     cache->updated = FcTrue;
 401
 402     d->name = (char *)FcStrCopy ((FcChar8 *)name);
 403     d->ent = FcDirCacheProduce (set, &d->metadata);
 404     d->offset = 0;
 405     d->subdirs = FcStrSetCreate();
 406     d->state = FcGCDirUpdated;
 407     for (i = 0; i < dirs->num; i++)
 408         FcStrSetAdd (d->subdirs, dirs->strs[i]);
 409     return FcTrue;
 410 }
 411
 412 FcBool
 413 FcGlobalCacheSave (FcGlobalCache    *cache,
 414                    const FcChar8    *cache_file,
 415                    FcConfig         *config)
 416 {
 417     int                 fd, fd_orig;
 418     FcGlobalCacheDir    *dir;
 419     FcAtomic            *atomic;
 420     off_t               current_arch_start = 0, truncate_to;
 421     char                * current_arch_machine_name, * header;
 422
 423     if (!cache->updated)
 424         return FcTrue;
 425
 426 #if defined (HAVE_GETUID) && defined (HAVE_GETEUID)
 427     /* Set-UID programs can't safely update the cache */
 428     if (getuid () != geteuid ())
 429         return FcFalse;
 430 #endif
 431
 432     atomic = FcAtomicCreate (cache_file);
 433     if (!atomic)
 434         return FcFalse;
 435
 436     if (!FcAtomicLock (atomic))
 437         goto bail1;
 438     fd = open ((char *) FcAtomicNewFile(atomic), O_RDWR | O_CREAT | O_BINARY,
 439                S_IRUSR | S_IWUSR);
 440     if (fd == -1)
 441         goto bail2;
 442     FcCacheWriteString (fd, FC_GLOBAL_MAGIC_COOKIE);
 443
 444     fd_orig = open ((char *) FcAtomicOrigFile(atomic), O_RDONLY | O_BINARY);
 445
 446     current_arch_machine_name = FcCacheMachineSignature ();
 447     if (fd_orig == -1)
 448         current_arch_start = 0;
 449     else
 450         current_arch_start = FcCacheSkipToArch (fd_orig,
 451                                                 current_arch_machine_name);
 452
 453     if (current_arch_start < 0)
 454     {
 455         off_t i = lseek(fd_orig, 0, SEEK_END);
 456         if (i < strlen (FC_GLOBAL_MAGIC_COOKIE)+1)
 457             i = strlen (FC_GLOBAL_MAGIC_COOKIE)+1;
 458         current_arch_start = FcCacheNextOffset (i);
 459     }
 460
 461     if (!FcCacheCopyOld(fd, fd_orig, current_arch_start))
 462         goto bail3;
 463
 464     current_arch_start = lseek(fd, 0, SEEK_CUR);
 465 #if defined (HAVE_FTRUNCATE)
 466     if (ftruncate (fd, current_arch_start) == -1)
 467         goto bail3;
 468 #else
 469 #if defined (HAVE_CHSIZE)
 470     if (chsize (fd, current_arch_start) == -1)
 471         goto bail3;
 472 #else
 473     goto bail3;
 474 #endif
 475 #endif
 476
 477     header = malloc (10 + strlen (current_arch_machine_name));
 478     if (!header)
 479         goto bail3;
 480
 481     truncate_to = current_arch_start + strlen(current_arch_machine_name) + 11;
 482     for (dir = cache->dirs; dir; dir = dir->next)
 483     {
 484         int i;
 485
 486         if (dir->state == FcGCDirDisabled)
 487             continue;
 488         truncate_to += strlen(dir->name) + 1;
 489         truncate_to += sizeof (FcCache);
 490         truncate_to = FcCacheNextOffset (truncate_to);
 491         truncate_to += dir->metadata.count;
 492
 493         for (i = 0; i < dir->subdirs->size; i++)
 494             truncate_to += strlen((char *)dir->subdirs->strs[i]) + 1;
 495         truncate_to ++;
 496     }
 497     truncate_to -= current_arch_start;
 498
 499     sprintf (header, "%8x ", (int)truncate_to);
 500     strcat (header, current_arch_machine_name);
 501     if (!FcCacheWriteString (fd, header))
 502         goto bail4;
 503
 504     free (header);
 505
 506     for (dir = cache->dirs; dir; dir = dir->next)
 507     {
 508         int i;
 509         const char * d;
 510         off_t off;
 511
 512         if (!dir->name || dir->state == FcGCDirDisabled)
 513             continue;
 514         d = (const char *)FcConfigNormalizeFontDir (config, (const FcChar8 *)dir->name);
 515         if (!d)
 516             continue;
 517
 518         if (dir->metadata.count && !dir->ent)
 519         {
 520             if (dir->state == FcGCDirUpdated || fd_orig < 0)
 521             {
 522                 fprintf(stderr, "Invalid metadata entry for %s, skipping...\n", d);
 523                 continue;
 524             }
 525             /* copy the old content */
 526             dir->ent = malloc (dir->metadata.count);
 527             if (!dir->ent)
 528             {
 529                 perror("malloc error");
 530                 continue;
 531             }
 532             off = FcCacheNextOffset (dir->offset + sizeof(FcCache));
 533             if (lseek (fd_orig, off, SEEK_SET) != off)
 534             {
 535                 perror("lseek");
 536                 free(dir->ent);
 537                 continue;
 538             }
 539             if (read (fd_orig, dir->ent, dir->metadata.count)
 540                 != dir->metadata.count)
 541             {
 542                 perror("read");
 543                 free(dir->ent);
 544                 continue;
 545             }
 546         }
 547
 548         FcCacheWriteString (fd, d);
 549
 550         for (i = 0; i < dir->subdirs->size; i++)
 551             FcCacheWriteString (fd, (char *)dir->subdirs->strs[i]);
 552         FcCacheWriteString (fd, "");
 553
 554         if (write (fd, &dir->metadata, sizeof(FcCache)) != sizeof(FcCache))
 555         {
 556             perror ("write metadata");
 557             free (dir->ent);
 558             continue;
 559         }
 560         off = FcCacheNextOffset (lseek(fd, 0, SEEK_CUR));
 561         if (lseek (fd, off, SEEK_SET) != off)
 562         {
 563             perror ("lseek");
 564             free (dir->ent);
 565             continue;
 566         }
 567         if (dir->metadata.count)
 568         {
 569             if (write (fd, dir->ent, dir->metadata.count) != dir->metadata.count)
 570             {
 571                 perror ("write dirent");
 572                 free (dir->ent);
 573                 continue;
 574             }
 575         }
 576         free (dir->ent);
 577     }
 578     FcCacheWriteString (fd, "");
 579
 580     if (close (fd) == -1)
 581         goto bail25;
 582
 583     close (fd_orig);
 584     fd_orig = -1;
 585
 586     if (!FcAtomicReplaceOrig (atomic))
 587         goto bail25;
 588
 589     FcAtomicUnlock (atomic);
 590     FcAtomicDestroy (atomic);
 591
 592     cache->updated = FcFalse;
 593     return FcTrue;
 594
 595  bail4:
 596     free (header);
 597  bail3:
 598     if (fd_orig != -1)
 599         close (fd_orig);
 600
 601     close (fd);
 602  bail25:
 603     FcAtomicDeleteNew (atomic);
 604  bail2:
 605     FcAtomicUnlock (atomic);
 606  bail1:
 607     FcAtomicDestroy (atomic);
 608     return FcFalse;
 609 }
 610
 611 /*
 612  * Find the next presumably-mmapable offset after the supplied file
 613  * position.
 614  */
 615 static int
 616 FcCacheNextOffset(off_t w)
 617 {
 618     static long pagesize = -1;
 619     if (pagesize == -1)
 620 #if defined (HAVE_SYSCONF)
 621         pagesize = sysconf(_SC_PAGESIZE);
 622 #else
 623         pagesize = FC_HARDCODED_PAGESIZE;
 624 #endif
 625     if (w % pagesize == 0)
 626         return w;
 627     else
 628         return ((w / pagesize)+1)*pagesize;
 629 }
 630
 631 /* return the address of the segment for the provided arch,
 632  * or -1 if arch not found */
 633 static off_t
 634 FcCacheSkipToArch (int fd, const char * arch)
 635 {
 636     char candidate_arch_machine_name_count[MACHINE_SIGNATURE_SIZE + 9];
 637     char * candidate_arch;
 638     off_t current_arch_start = 0;
 639
 640     lseek (fd, 0, SEEK_SET);
 641     FcCacheSkipString (fd);
 642     current_arch_start = lseek (fd, 0, SEEK_CUR);
 643
 644     /* skip arches that are not the current arch */
 645     while (1)
 646     {
 647         long bs;
 648
 649         if (lseek (fd, current_arch_start, SEEK_SET) != current_arch_start)
 650             return -1;
 651
 652         if (FcCacheReadString (fd, candidate_arch_machine_name_count,
 653                                 sizeof (candidate_arch_machine_name_count)) == 0)
 654             return -1;
 655         if (!strlen(candidate_arch_machine_name_count))
 656             return -1;
 657         bs = strtol(candidate_arch_machine_name_count, &candidate_arch, 16);
 658
 659         /* count = 0 should probably be distinguished from the !bs condition */
 660         if (!bs || bs < strlen (candidate_arch_machine_name_count))
 661             return -1;
 662
 663         candidate_arch++; /* skip leading space */
 664
 665         if (strcmp (candidate_arch, arch)==0)
 666             return current_arch_start;
 667         current_arch_start += bs;
 668         current_arch_start = FcCacheNextOffset (current_arch_start);
 669     }
 670 }
 671
 672 /* Cuts out the segment at the file pointer (moves everything else
 673  * down to cover it), and leaves the file pointer at the end of the
 674  * file. */
 675 static FcBool
 676 FcCacheCopyOld (int fd, int fd_orig, off_t start)
 677 {
 678     char * buf = malloc (8192);
 679     char candidate_arch_machine_name[MACHINE_SIGNATURE_SIZE + 9];
 680     long bs;
 681     int c, bytes_skipped;
 682     off_t loc;
 683
 684     if (!buf)
 685         return FcFalse;
 686
 687     loc = 0;
 688     lseek (fd, 0, SEEK_SET); lseek (fd_orig, 0, SEEK_SET);
 689     FcCacheSkipString (fd); FcCacheSkipString (fd_orig);
 690     do
 691     {
 692         int b = 8192;
 693         if (loc + b > start)
 694             b = start - loc;
 695
 696         if ((c = read (fd_orig, buf, b)) <= 0)
 697             break;
 698         if (write (fd, buf, c) < 0)
 699             goto bail;
 700
 701         loc += c;
 702     }
 703     while (c > 0);
 704
 705     lseek (fd, start, SEEK_SET);
 706     if (FcCacheReadString (fd, candidate_arch_machine_name,
 707                            sizeof (candidate_arch_machine_name)) == 0)
 708         goto done;
 709     if (!strlen(candidate_arch_machine_name))
 710         goto done;
 711
 712     bs = strtol(candidate_arch_machine_name, 0, 16);
 713     if (bs == 0)
 714         goto done;
 715
 716     bytes_skipped = 0;
 717     do
 718     {
 719         lseek (fd, start+bs+bytes_skipped, SEEK_SET);
 720         if ((c = read (fd, buf, 8192)) <= 0)
 721             break;
 722         lseek (fd, start+bytes_skipped, SEEK_SET);
 723         if (write (fd, buf, c) < 0)
 724             goto bail;
 725         bytes_skipped += c;
 726     }
 727     while (c > 0);
 728     lseek (fd, start+bytes_skipped, SEEK_SET);
 729
 730  done:
 731     free (buf);
 732     return FcTrue;
 733
 734  bail:
 735     free (buf);
 736     return FcFalse;
 737 }
 738
 739 /* Does not check that the cache has the appropriate arch section. */
 740 /* Also, this can be fooled if the original location has a stale
 741  * cache, and the hashed location has an up-to-date cache.  Oh well,
 742  * sucks to be you in that case! */
 743 FcBool
 744 FcDirCacheValid (const FcChar8 *dir)
 745 {
 746     struct stat file_stat, dir_stat;
 747     int         fd;
 748
 749     if (stat ((char *) dir, &dir_stat) < 0)
 750         return FcFalse;
 751
 752     fd = FcDirCacheOpen (dir);
 753
 754     if (fd < 0)
 755         return FcFalse;
 756     if (fstat (fd, &file_stat) < 0)
 757         goto bail;
 758
 759     close (fd);
 760
 761     /*
 762      * If the directory has been modified more recently than
 763      * the cache file, the cache is not valid
 764      */
 765     if (dir_stat.st_mtime > file_stat.st_mtime)
 766         return FcFalse;
 767
 768     return FcTrue;
 769
 770  bail:
 771     close (fd);
 772     return FcFalse;
 773 }
 774
 775 /* Assumes that the cache file in 'dir' exists.
 776  * Checks that the cache has the appropriate arch section. */
 777 FcBool
 778 FcDirCacheHasCurrentArch (const FcChar8 *dir)
 779 {
 780     int         fd;
 781     off_t       current_arch_start;
 782     char        *current_arch_machine_name;
 783     FcCache     metadata;
 784     char        subdirName[FC_MAX_FILE_LEN + 1 + 12 + 1];
 785
 786     fd = FcDirCacheOpen (dir);
 787     if (fd < 0)
 788         goto bail;
 789
 790     current_arch_machine_name = FcCacheMachineSignature();
 791     current_arch_start = FcCacheSkipToArch(fd, current_arch_machine_name);
 792
 793     if (current_arch_start >= 0)
 794     {
 795         if (lseek (fd, current_arch_start, SEEK_SET) != current_arch_start)
 796             goto bail1;
 797
 798         FcCacheSkipString (fd);
 799
 800         while (FcCacheReadString (fd, subdirName, sizeof (subdirName)) && strlen (subdirName) > 0)
 801             ;
 802
 803         if (read(fd, &metadata, sizeof(FcCache)) != sizeof(FcCache))
 804             goto bail1;
 805
 806         if (metadata.magic != FC_CACHE_MAGIC)
 807             goto bail1;
 808     }
 809
 810     close (fd);
 811
 812     if (current_arch_start < 0)
 813         return FcFalse;
 814
 815     return FcTrue;
 816
 817  bail1:
 818     close (fd);
 819  bail:
 820     return FcFalse;
 821 }
 822
 823 FcBool
 824 FcDirCacheUnlink (const FcChar8 *dir, FcConfig *config)
 825 {
 826     char        *cache_file;
 827     char        *cache_hashed = 0;
 828     int         fd, collisions;
 829     struct stat cache_stat;
 830     char        name_buf[FC_MAX_FILE_LEN];
 831
 832     dir = FcConfigNormalizeFontDir (config, dir);
 833     cache_file = (char *)FcStrPlus (dir, (FcChar8 *) "/" FC_DIR_CACHE_FILE);
 834     if (!cache_file)
 835         return FcFalse;
 836
 837     /* First remove normal cache file. */
 838     if (stat ((char *) cache_file, &cache_stat) == 0)
 839         unlink ((char *)cache_file);
 840
 841     /* Next remove any applicable hashed files. */
 842     fd = -1; collisions = 0;
 843     do
 844     {
 845         if (cache_hashed)
 846             FcStrFree ((FcChar8 *)cache_hashed);
 847
 848         cache_hashed = FcDirCacheHashName (cache_file, collisions++);
 849         if (!cache_hashed)
 850             goto bail;
 851
 852         if (fd > 0)
 853             close (fd);
 854         fd = open(cache_hashed, O_RDONLY | O_BINARY);
 855         if (fd == -1)
 856         {
 857             FcStrFree ((FcChar8 *)cache_file);
 858             return FcTrue;
 859         }
 860
 861         if (!FcCacheReadString (fd, name_buf, sizeof (name_buf)) || !strlen(name_buf))
 862         {
 863             FcStrFree ((FcChar8 *)cache_hashed);
 864             goto bail;
 865         }
 866     } while (strcmp (name_buf, cache_file) != 0);
 867
 868     close (fd);
 869
 870     if (stat ((char *) cache_hashed, &cache_stat) == 0 &&
 871         unlink ((char *)cache_hashed) != 0)
 872     {
 873         FcStrFree ((FcChar8 *)cache_hashed);
 874         goto bail;
 875     }
 876
 877     FcStrFree ((FcChar8 *)cache_file);
 878     FcStrFree ((FcChar8 *)cache_hashed);
 879     return FcTrue;
 880
 881  bail:
 882     FcStrFree ((FcChar8 *)cache_file);
 883     return FcFalse;
 884 }
 885
 886 static int
 887 FcCacheReadDirs (FcConfig * config, FcGlobalCache * cache,
 888                  FcStrList *list, FcFontSet * set, FcStrSet *processed_dirs)
 889 {
 890     int                 ret = 0;
 891     FcChar8             *dir;
 892     FcStrSet            *subdirs;
 893     FcStrList           *sublist;
 894     struct stat         statb;
 895     FcGlobalCacheDir   *d;
 896
 897     /*
 898      * Read in the results from 'list'.
 899      */
 900     while ((dir = FcStrListNext (list)))
 901     {
 902         if (!FcConfigAcceptFilename (config, dir))
 903             continue;
 904
 905         /* Skip this directory if already updated
 906          * to avoid the looped directories via symlinks
 907          * Clearly a dir not in fonts.conf shouldn't be globally cached.
 908          */
 909         dir = (FcChar8 *)FcConfigNormalizeFontDir (config, dir);
 910         if (!dir)
 911             continue;
 912
 913         if (FcStrSetMember (processed_dirs, dir))
 914             continue;
 915         if (!FcStrSetAdd (processed_dirs, dir))
 916             continue;
 917
 918         subdirs = FcStrSetCreate ();
 919         if (!subdirs)
 920         {
 921             fprintf (stderr, "Can't create directory set\n");
 922             ret++;
 923             continue;
 924         }
 925
 926         if (access ((char *) dir, X_OK) < 0)
 927         {
 928             switch (errno) {
 929             case ENOENT:
 930             case ENOTDIR:
 931             case EACCES:
 932                 break;
 933             default:
 934                 fprintf (stderr, "\"%s\": ", dir);
 935                 perror ("");
 936                 ret++;
 937             }
 938             FcStrSetDestroy (subdirs);
 939             continue;
 940         }
 941         if (stat ((char *) dir, &statb) == -1)
 942         {
 943             fprintf (stderr, "\"%s\": ", dir);
 944             perror ("");
 945             FcStrSetDestroy (subdirs);
 946             ret++;
 947             continue;
 948         }
 949         if (!S_ISDIR (statb.st_mode))
 950         {
 951             fprintf (stderr, "\"%s\": not a directory, skipping\n", dir);
 952             FcStrSetDestroy (subdirs);
 953             continue;
 954         }
 955         if (FcDirCacheValid (dir) &&
 956             FcDirCacheHasCurrentArch (dir) &&
 957             FcDirCacheRead (set, subdirs, dir, config))
 958         {
 959             /* if an old entry is found in the global cache, disable it */
 960             if ((d = FcGlobalCacheDirFind (cache, (const char *)dir)) != NULL)
 961             {
 962                 d->state = FcGCDirDisabled;
 963                 /* save the updated config later without this entry */
 964                 cache->updated = FcTrue;
 965             }
 966         }
 967         else
 968         {
 969             if (FcDebug () & FC_DBG_FONTSET)
 970                 printf ("cache scan dir %s\n", dir);
 971
 972             FcDirScanConfig (set, subdirs, cache,
 973                              config->blanks, dir, FcFalse, config);
 974         }
 975         sublist = FcStrListCreate (subdirs);
 976         FcStrSetDestroy (subdirs);
 977         if (!sublist)
 978         {
 979             fprintf (stderr, "Can't create subdir list in \"%s\"\n", dir);
 980             ret++;
 981             continue;
 982         }
 983         ret += FcCacheReadDirs (config, cache, sublist, set, processed_dirs);
 984     }
 985     FcStrListDone (list);
 986     return ret;
 987 }
 988
 989 FcFontSet *
 990 FcCacheRead (FcConfig *config, FcGlobalCache * cache)
 991 {
 992     FcFontSet   *s = FcFontSetCreate();
 993     FcStrSet    *processed_dirs;
 994
 995     if (!s)
 996         return 0;
 997
 998     processed_dirs = FcStrSetCreate();
 999     if (!processed_dirs)
1000         goto bail;
1001
1002     if (FcCacheReadDirs (config, cache, FcConfigGetConfigDirs (config), s, processed_dirs))
1003         goto bail1;
1004
1005     FcStrSetDestroy (processed_dirs);
1006     return s;
1007
1008  bail1:
1009     FcStrSetDestroy (processed_dirs);
1010  bail:
1011     FcFontSetDestroy (s);
1012     return 0;
1013 }
1014
1015 static const char bin2hex[] = { '0', '1', '2', '3',
1016                                 '4', '5', '6', '7',
1017                                 '8', '9', 'a', 'b',
1018                                 'c', 'd', 'e', 'f' };
1019
1020 static char *
1021 FcDirCacheHashName (char * cache_file, int collisions)
1022 {
1023     unsigned char       hash[16], hex_hash[33];
1024     char                *cache_hashed;
1025     unsigned char       uscore = '_';
1026     int                 cnt, i;
1027     FcChar8             *tmp;
1028     struct MD5Context   ctx;
1029
1030     MD5Init (&ctx);
1031     MD5Update (&ctx, (unsigned char *)cache_file, strlen (cache_file));
1032
1033     for (i = 0; i < collisions; i++)
1034         MD5Update (&ctx, &uscore, 1);
1035
1036     MD5Final (hash, &ctx);
1037
1038     for (cnt = 0; cnt < 16; ++cnt)
1039     {
1040         hex_hash[2*cnt] = bin2hex[hash[cnt] >> 4];
1041         hex_hash[2*cnt+1] = bin2hex[hash[cnt] & 0xf];
1042     }
1043     hex_hash[32] = 0;
1044
1045     tmp = FcStrPlus ((FcChar8 *)hex_hash, (FcChar8 *)FC_CACHE_SUFFIX);
1046     if (!tmp)
1047         return 0;
1048
1049     cache_hashed = (char *)FcStrPlus ((FcChar8 *)PKGCACHEDIR"/", tmp);
1050     free (tmp);
1051
1052     return cache_hashed;
1053 }
1054
1055 /* Opens the hashed name for cache_file.
1056  * This would fail in the unlikely event of a collision and subsequent
1057  * removal of the file which originally caused the collision. */
1058 static int
1059 FcDirCacheOpen (const FcChar8 *dir)
1060 {
1061     FcBool      found;
1062     int         fd = -1, collisions = 0;
1063     char        *cache_file, *cache_hashed;
1064     char        name_buf[FC_MAX_FILE_LEN];
1065     struct stat dir_stat;
1066
1067     if (stat ((char *)dir, &dir_stat) == -1)
1068         return -1;
1069
1070     cache_file = (char *)FcStrPlus (dir, (FcChar8 *) "/" FC_DIR_CACHE_FILE);
1071     if (!cache_file)
1072         return -1;
1073
1074     found = FcFalse;
1075     do
1076     {
1077         struct stat     c;
1078         FcChar8         *name_buf_dir;
1079
1080         if (fd >= 0)
1081             close (fd);
1082
1083         cache_hashed = FcDirCacheHashName (cache_file, collisions++);
1084         if (!cache_hashed)
1085         {
1086             FcStrFree ((FcChar8 *)cache_file);
1087             return -1;
1088         }
1089
1090         fd = open(cache_hashed, O_RDONLY | O_BINARY);
1091         FcStrFree ((FcChar8 *)cache_hashed);
1092
1093         if (fd == -1)
1094             break;
1095         if (!FcCacheReadString (fd, name_buf, sizeof (name_buf)) ||
1096             !strlen(name_buf))
1097             break;
1098
1099         name_buf_dir = FcStrDirname ((FcChar8 *)name_buf);
1100         if (stat ((char *)name_buf_dir, &c) == -1)
1101         {
1102             FcStrFree (name_buf_dir);
1103             continue;
1104         }
1105         FcStrFree (name_buf_dir);
1106         found = (c.st_ino == dir_stat.st_ino) && (c.st_dev == dir_stat.st_dev);
1107     } while (!found);
1108
1109     if (!found || fd < 0)
1110     {
1111         if (fd >= 0)
1112             close (fd);
1113         fd = open(cache_file, O_RDONLY | O_BINARY);
1114     }
1115
1116     FcStrFree ((FcChar8 *)cache_file);
1117     return fd;
1118 }
1119
1120 /* read serialized state from the cache file */
1121 FcBool
1122 FcDirCacheRead (FcFontSet * set, FcStrSet * dirs, const FcChar8 *dir, FcConfig *config)
1123 {
1124     int         fd;
1125     char        *current_arch_machine_name;
1126     char        candidate_arch_machine_name[9+MACHINE_SIGNATURE_SIZE];
1127     off_t       current_arch_start = 0;
1128     char        subdirName[FC_MAX_FILE_LEN + 1 + 12 + 1];
1129
1130     fd = FcDirCacheOpen (dir);
1131     if (fd < 0)
1132         goto bail;
1133
1134     current_arch_machine_name = FcCacheMachineSignature();
1135     current_arch_start = FcCacheSkipToArch(fd,
1136                                            current_arch_machine_name);
1137     if (current_arch_start < 0)
1138         goto bail1;
1139
1140     lseek (fd, current_arch_start, SEEK_SET);
1141     if (FcCacheReadString (fd, candidate_arch_machine_name,
1142                            sizeof (candidate_arch_machine_name)) == 0)
1143         goto bail1;
1144
1145     while (FcCacheReadString (fd, subdirName, sizeof (subdirName)) && strlen (subdirName) > 0)
1146         FcStrSetAdd (dirs, (FcChar8 *)subdirName);
1147
1148     if (!FcDirCacheConsume (fd, (const char *)dir, set, config))
1149         goto bail1;
1150
1151     close(fd);
1152     return FcTrue;
1153
1154  bail1:
1155     close (fd);
1156  bail:
1157     return FcFalse;
1158 }
1159
1160 static FcBool
1161 FcDirCacheConsume (int fd, const char * dir, FcFontSet *set, FcConfig *config)
1162 {
1163     FcCache metadata;
1164     void * current_dir_block;
1165     off_t pos;
1166
1167     if (read(fd, &metadata, sizeof(FcCache)) != sizeof(FcCache))
1168         return FcFalse;
1169     if (metadata.magic != FC_CACHE_MAGIC)
1170         return FcFalse;
1171
1172     if (!metadata.count)
1173     {
1174         pos = FcCacheNextOffset (lseek(fd, 0, SEEK_CUR));
1175         lseek (fd, pos, SEEK_SET);
1176         if (config)
1177             FcConfigAddFontDir (config, (FcChar8 *)dir);
1178         return FcTrue;
1179     }
1180
1181     pos = FcCacheNextOffset (lseek(fd, 0, SEEK_CUR));
1182 #if defined(HAVE_MMAP) || defined(__CYGWIN__)
1183     current_dir_block = mmap (0, metadata.count,
1184                               PROT_READ, MAP_SHARED, fd, pos);
1185     if (current_dir_block == MAP_FAILED)
1186         return FcFalse;
1187 #else
1188     current_dir_block = malloc (metadata.count);
1189     if (!current_dir_block)
1190         return FcFalse;
1191
1192     /* could also use CreateMappedViewOfFile under MinGW... */
1193     if (read (fd, current_dir_block, metadata.count) != metadata.count)
1194         goto bail;
1195 #endif
1196     lseek (fd, pos+metadata.count, SEEK_SET);
1197
1198     FcCacheAddBankDir (metadata.bank, dir);
1199     if (config)
1200         FcConfigAddFontDir (config, (FcChar8 *)dir);
1201
1202     if (!FcFontSetUnserialize (&metadata, set, current_dir_block))
1203         goto bail;
1204
1205     return FcTrue;
1206  bail:
1207 #if !(defined(HAVE_MMAP) || defined(__CYGWIN__))
1208     free (current_dir_block);
1209 #endif
1210     return FcFalse;
1211 }
1212
1213 static void *
1214 FcDirCacheProduce (FcFontSet *set, FcCache *metadata)
1215 {
1216     void * current_dir_block, * final_dir_block;
1217     static unsigned int rand_state = 0;
1218     int bank, needed_bytes_no_align;
1219
1220 #if defined (HAVE_RAND_R)
1221     if (!rand_state)
1222         rand_state = time(0L);
1223     bank = rand_r(&rand_state);
1224
1225     while (FcCacheHaveBank(bank))
1226         bank = rand_r(&rand_state);
1227 #else
1228     if (!rand_state)
1229     {
1230         rand_state = 1;
1231         srand (time (0L));
1232     }
1233     bank = rand();
1234
1235     while (FcCacheHaveBank(bank))
1236         bank = rand();
1237 #endif
1238
1239     memset (metadata, 0, sizeof(FcCache));
1240     FcFontSetNewBank();
1241     needed_bytes_no_align = FcFontSetNeededBytes (set);
1242     metadata->count = needed_bytes_no_align +
1243         FcFontSetNeededBytesAlign ();
1244     metadata->magic = FC_CACHE_MAGIC;
1245     metadata->bank = bank;
1246
1247     if (!needed_bytes_no_align) /* not a failure, no fonts to write */
1248     {
1249         /* no, you don't really need to write any bytes at all. */
1250         metadata->count = 0;
1251         return 0;
1252     }
1253
1254     current_dir_block = malloc (metadata->count);
1255     if (!current_dir_block)
1256         goto bail;
1257     /* shut up valgrind */
1258     memset (current_dir_block, 0, metadata->count);
1259     final_dir_block = FcFontSetDistributeBytes (metadata, current_dir_block);
1260
1261     if ((void *)((char *)current_dir_block+metadata->count) < final_dir_block)
1262         goto bail;
1263
1264     if (!FcFontSetSerialize (bank, set))
1265         goto bail;
1266
1267     return current_dir_block;
1268
1269  bail:
1270     free (current_dir_block);
1271     return 0;
1272 }
1273
1274 /* write serialized state to the cache file */
1275 FcBool
1276 FcDirCacheWrite (FcFontSet *set, FcStrSet *dirs, const FcChar8 *dir)
1277 {
1278     char            *cache_file;
1279     char            *cache_hashed;
1280     int             fd, fd_orig, i, dirs_count;
1281     FcAtomic        *atomic;
1282     FcCache         metadata;
1283     off_t           current_arch_start = 0, truncate_to;
1284     char            name_buf[FC_MAX_FILE_LEN];
1285     int             collisions;
1286
1287     char            *current_arch_machine_name, * header;
1288     void            *current_dir_block = 0;
1289
1290     dir = FcConfigNormalizeFontDir (FcConfigGetCurrent(), dir);
1291     if (!dir)
1292         return FcFalse;
1293
1294     cache_file = (char *)FcStrPlus (dir, (FcChar8 *) "/" FC_DIR_CACHE_FILE);
1295     if (!cache_file)
1296         goto bail;
1297
1298     /* Ensure that we're not trampling a cache for some other dir. */
1299     /* This is slightly different from FcDirCacheOpen, since it
1300      * needs the filename, not the file descriptor. */
1301     fd = -1; collisions = 0;
1302     do
1303     {
1304         cache_hashed = FcDirCacheHashName (cache_file, collisions++);
1305         if (!cache_hashed)
1306             goto bail0;
1307
1308         if (fd > 0)
1309             close (fd);
1310         fd = open(cache_hashed, O_RDONLY | O_BINARY);
1311         if (fd == -1)
1312             break;
1313         if(!FcCacheReadString (fd, name_buf, sizeof (name_buf)) || !strlen(name_buf))
1314         {
1315             close (fd);
1316             FcStrFree ((FcChar8 *)cache_hashed);
1317             continue;
1318         }
1319         close (fd);
1320
1321         if (strcmp (name_buf, cache_file) != 0)
1322         {
1323             FcStrFree ((FcChar8 *)cache_hashed);
1324             continue;
1325         }
1326
1327         break;
1328     } while (1);
1329
1330     current_dir_block = FcDirCacheProduce (set, &metadata);
1331
1332     if (metadata.count && !current_dir_block)
1333         goto bail1;
1334
1335     if (FcDebug () & FC_DBG_CACHE)
1336         printf ("FcDirCacheWriteDir cache_file \"%s\"\n", cache_file);
1337
1338     atomic = FcAtomicCreate ((FcChar8 *)cache_hashed);
1339     if (!atomic)
1340         goto bail1;
1341
1342     if (!FcAtomicLock (atomic))
1343     {
1344         /* Now try rewriting the original version of the file. */
1345         FcAtomicDestroy (atomic);
1346
1347         atomic = FcAtomicCreate ((FcChar8 *)cache_file);
1348         fd_orig = open (cache_file, O_RDONLY | O_BINARY);
1349         if (fd_orig == -1)
1350             fd_orig = open((char *)FcAtomicOrigFile (atomic), O_RDONLY | O_BINARY);
1351
1352         fd = open((char *)FcAtomicNewFile (atomic), O_RDWR | O_CREAT | O_BINARY, 0666);
1353         if (fd == -1)
1354             goto bail2;
1355     }
1356
1357     /* In all cases, try opening the real location of the cache file first. */
1358     /* (even if that's not atomic.) */
1359     fd_orig = open (cache_file, O_RDONLY | O_BINARY);
1360     if (fd_orig == -1)
1361         fd_orig = open((char *)FcAtomicOrigFile (atomic), O_RDONLY | O_BINARY);
1362
1363     fd = open((char *)FcAtomicNewFile (atomic), O_RDWR | O_CREAT | O_BINARY, 0666);
1364     if (fd == -1)
1365         goto bail3;
1366
1367     FcCacheWriteString (fd, cache_file);
1368
1369     current_arch_machine_name = FcCacheMachineSignature ();
1370     current_arch_start = 0;
1371
1372     if (fd_orig != -1)
1373         current_arch_start =
1374             FcCacheSkipToArch(fd_orig, current_arch_machine_name);
1375
1376     if (current_arch_start < 0)
1377     {
1378         off_t offset = lseek(fd_orig, 0, SEEK_END);
1379         current_arch_start = FcCacheNextOffset (offset);
1380     }
1381
1382     if (fd_orig != -1 && !FcCacheCopyOld(fd, fd_orig, current_arch_start))
1383         goto bail4;
1384
1385     if (fd_orig != -1)
1386         close (fd_orig);
1387
1388     current_arch_start = lseek(fd, 0, SEEK_CUR);
1389 #if defined (HAVE_FTRUNCATE)
1390     if (ftruncate (fd, current_arch_start) == -1)
1391         goto bail4;
1392 #else
1393 #if defined (HAVE_CHSIZE)
1394     if (chsize (fd, current_arch_start) == -1)
1395         goto bail4;
1396 #else
1397     goto bail4;
1398 #endif
1399 #endif
1400
1401     /* allocate space for subdir names in this block */
1402     dirs_count = 0;
1403     for (i = 0; i < dirs->size; i++)
1404         dirs_count += strlen((char *)dirs->strs[i]) + 1;
1405     dirs_count ++;
1406
1407     /* now write the address of the next offset */
1408     truncate_to = FcCacheNextOffset (FcCacheNextOffset (current_arch_start + sizeof (FcCache) + dirs_count) + metadata.count) - current_arch_start;
1409     header = malloc (10 + strlen (current_arch_machine_name));
1410     if (!header)
1411         goto bail4;
1412     sprintf (header, "%8x ", (int)truncate_to);
1413     strcat (header, current_arch_machine_name);
1414     if (!FcCacheWriteString (fd, header))
1415         goto bail5;
1416
1417     for (i = 0; i < dirs->size; i++)
1418         FcCacheWriteString (fd, (char *)dirs->strs[i]);
1419     FcCacheWriteString (fd, "");
1420
1421     if (write (fd, &metadata, sizeof(FcCache)) != sizeof(FcCache))
1422     {
1423         perror("write metadata");
1424         goto bail5;
1425     }
1426     if (metadata.count)
1427     {
1428         off_t off = FcCacheNextOffset (lseek(fd, 0, SEEK_END));
1429         if (lseek (fd, off, SEEK_SET) != off)
1430             perror("lseek");
1431         else if (write (fd, current_dir_block, metadata.count) !=
1432                  metadata.count)
1433             perror("write current_dir_block");
1434         free (current_dir_block);
1435         current_dir_block = 0;
1436     }
1437
1438     /* this actually serves to pad out the cache file, if needed */
1439 #if defined (HAVE_FTRUNCATE)
1440     if (ftruncate (fd, current_arch_start + truncate_to) == -1)
1441         goto bail5;
1442 #else
1443 #if defined (HAVE_CHSIZE)
1444     if (chsize (fd, current_arch_start + truncate_to) == -1)
1445         goto bail5;
1446 #else
1447     goto bail5;
1448 #endif
1449 #endif
1450
1451     free (header);
1452     close(fd);
1453     if (!FcAtomicReplaceOrig(atomic))
1454         goto bail3;
1455     FcStrFree ((FcChar8 *)cache_hashed);
1456     FcStrFree ((FcChar8 *)cache_file);
1457     FcAtomicUnlock (atomic);
1458     FcAtomicDestroy (atomic);
1459     return FcTrue;
1460
1461  bail5:
1462     free (header);
1463  bail4:
1464     close (fd);
1465  bail3:
1466     FcAtomicUnlock (atomic);
1467  bail2:
1468     FcAtomicDestroy (atomic);
1469  bail1:
1470     FcStrFree ((FcChar8 *)cache_hashed);
1471  bail0:
1472     unlink ((char *)cache_file);
1473     FcStrFree ((FcChar8 *)cache_file);
1474     if (current_dir_block)
1475         free (current_dir_block);
1476  bail:
1477     return FcFalse;
1478 }
1479
1480 static char *
1481 FcCacheMachineSignature ()
1482 {
1483     static char buf[MACHINE_SIGNATURE_SIZE];
1484     int32_t magic = ENDIAN_TEST;
1485     char * m = (char *)&magic;
1486
1487     sprintf (buf, "%2x%2x%2x%2x "
1488              "%4x %4x %4x %4x %4x %4x %4x %4x %4x %4x %4x %4x "
1489              "%4x %4x %4x %4x %4x %4x %4x %4x\n",
1490              m[0], m[1], m[2], m[3],
1491              (unsigned int)sizeof (char),
1492              (unsigned int)sizeof (char *),
1493              (unsigned int)sizeof (int),
1494              (unsigned int)sizeof (FcPattern),
1495              (unsigned int)sizeof (FcPatternEltPtr),
1496              (unsigned int)sizeof (struct _FcPatternElt *),
1497              (unsigned int)sizeof (FcPatternElt),
1498              (unsigned int)sizeof (FcObjectPtr),
1499              (unsigned int)sizeof (FcValueListPtr),
1500              (unsigned int)sizeof (FcValue),
1501              (unsigned int)sizeof (FcValueBinding),
1502              (unsigned int)sizeof (struct _FcValueList *),
1503              (unsigned int)sizeof (FcCharSet),
1504              (unsigned int)sizeof (FcCharLeaf **),
1505              (unsigned int)sizeof (FcChar16 *),
1506              (unsigned int)sizeof (FcChar16),
1507              (unsigned int)sizeof (FcCharLeaf),
1508              (unsigned int)sizeof (FcChar32),
1509              (unsigned int)sizeof (FcCache),
1510 #if defined (HAVE_SYSCONF)
1511              (unsigned int)sysconf(_SC_PAGESIZE));
1512 #else
1513              (unsigned int)FC_HARDCODED_PAGESIZE);
1514 #endif
1515
1516     return buf;
1517 }
1518
1519 static int banks_ptr = 0, banks_alloc = 0;
1520 int * _fcBankId = 0, * _fcBankIdx = 0;
1521 static const char ** bankDirs = 0;
1522
1523 static FcBool
1524 FcCacheHaveBank (int bank)
1525 {
1526     int i;
1527
1528     if (bank < FC_BANK_FIRST)
1529         return FcTrue;
1530
1531     for (i = 0; i < banks_ptr; i++)
1532         if (_fcBankId[i] == bank)
1533             return FcTrue;
1534
1535     return FcFalse;
1536 }
1537
1538 int
1539 FcCacheBankToIndexMTF (int bank)
1540 {
1541     int i, j;
1542
1543     for (i = 0; i < banks_ptr; i++)
1544         if (_fcBankId[_fcBankIdx[i]] == bank)
1545         {
1546             int t = _fcBankIdx[i];
1547
1548             for (j = i; j > 0; j--)
1549                 _fcBankIdx[j] = _fcBankIdx[j-1];
1550             _fcBankIdx[0] = t;
1551             return t;
1552         }
1553
1554     if (banks_ptr >= banks_alloc)
1555     {
1556         int * b, * bidx;
1557         const char ** bds;
1558
1559         b = realloc (_fcBankId, (banks_alloc + 4) * sizeof(int));
1560         if (!b)
1561             return -1;
1562         _fcBankId = b;
1563
1564         bidx = realloc (_fcBankIdx, (banks_alloc + 4) * sizeof(int));
1565         if (!bidx)
1566             return -1;
1567         _fcBankIdx = bidx;
1568
1569         bds = realloc (bankDirs, (banks_alloc + 4) * sizeof (char *));
1570         if (!bds)
1571             return -1;
1572         bankDirs = bds;
1573
1574         banks_alloc += 4;
1575     }
1576
1577     i = banks_ptr++;
1578     _fcBankId[i] = bank;
1579     _fcBankIdx[i] = i;
1580     return i;
1581 }
1582
1583 static void
1584 FcCacheAddBankDir (int bank, const char * dir)
1585 {
1586     int bi = FcCacheBankToIndexMTF (bank);
1587
1588     if (bi < 0)
1589         return;
1590
1591     bankDirs[bi] = (const char *)FcStrCopy ((FcChar8 *)dir);
1592 }
1593
1594 const char *
1595 FcCacheFindBankDir (int bank)
1596 {
1597     int bi = FcCacheBankToIndex (bank);
1598     return bankDirs[bi];
1599 }
1600
1601 /*
1602  * This code implements the MD5 message-digest algorithm.
1603  * The algorithm is due to Ron Rivest.  This code was
1604  * written by Colin Plumb in 1993, no copyright is claimed.
1605  * This code is in the public domain; do with it what you wish.
1606  *
1607  * Equivalent code is available from RSA Data Security, Inc.
1608  * This code has been tested against that, and is equivalent,
1609  * except that you don't need to include two pages of legalese
1610  * with every copy.
1611  *
1612  * To compute the message digest of a chunk of bytes, declare an
1613  * MD5Context structure, pass it to MD5Init, call MD5Update as
1614  * needed on buffers full of bytes, and then call MD5Final, which
1615  * will fill a supplied 16-byte array with the digest.
1616  */
1617
1618 #ifndef HIGHFIRST
1619 #define byteReverse(buf, len)   /* Nothing */
1620 #else
1621 /*
1622  * Note: this code is harmless on little-endian machines.
1623  */
1624 void byteReverse(unsigned char *buf, unsigned longs)
1625 {
1626     FcChar32 t;
1627     do {
1628         t = (FcChar32) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
1629             ((unsigned) buf[1] << 8 | buf[0]);
1630         *(FcChar32 *) buf = t;
1631         buf += 4;
1632     } while (--longs);
1633 }
1634 #endif
1635
1636 /*
1637  * Start MD5 accumulation.  Set bit count to 0 and buffer to mysterious
1638  * initialization constants.
1639  */
1640 static void MD5Init(struct MD5Context *ctx)
1641 {
1642     ctx->buf[0] = 0x67452301;
1643     ctx->buf[1] = 0xefcdab89;
1644     ctx->buf[2] = 0x98badcfe;
1645     ctx->buf[3] = 0x10325476;
1646
1647     ctx->bits[0] = 0;
1648     ctx->bits[1] = 0;
1649 }
1650
1651 /*
1652  * Update context to reflect the concatenation of another buffer full
1653  * of bytes.
1654  */
1655 static void MD5Update(struct MD5Context *ctx, unsigned char *buf, unsigned len)
1656 {
1657     FcChar32 t;
1658
1659     /* Update bitcount */
1660
1661     t = ctx->bits[0];
1662     if ((ctx->bits[0] = t + ((FcChar32) len << 3)) < t)
1663         ctx->bits[1]++;         /* Carry from low to high */
1664     ctx->bits[1] += len >> 29;
1665
1666     t = (t >> 3) & 0x3f;        /* Bytes already in shsInfo->data */
1667
1668     /* Handle any leading odd-sized chunks */
1669
1670     if (t) {
1671         unsigned char *p = (unsigned char *) ctx->in + t;
1672
1673         t = 64 - t;
1674         if (len < t) {
1675             memcpy(p, buf, len);
1676             return;
1677         }
1678         memcpy(p, buf, t);
1679         byteReverse(ctx->in, 16);
1680         MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
1681         buf += t;
1682         len -= t;
1683     }
1684     /* Process data in 64-byte chunks */
1685
1686     while (len >= 64) {
1687         memcpy(ctx->in, buf, 64);
1688         byteReverse(ctx->in, 16);
1689         MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
1690         buf += 64;
1691         len -= 64;
1692     }
1693
1694     /* Handle any remaining bytes of data. */
1695
1696     memcpy(ctx->in, buf, len);
1697 }
1698
1699 /*
1700  * Final wrapup - pad to 64-byte boundary with the bit pattern
1701  * 1 0* (64-bit count of bits processed, MSB-first)
1702  */
1703 static void MD5Final(unsigned char digest[16], struct MD5Context *ctx)
1704 {
1705     unsigned count;
1706     unsigned char *p;
1707
1708     /* Compute number of bytes mod 64 */
1709     count = (ctx->bits[0] >> 3) & 0x3F;
1710
1711     /* Set the first char of padding to 0x80.  This is safe since there is
1712        always at least one byte free */
1713     p = ctx->in + count;
1714     *p++ = 0x80;
1715
1716     /* Bytes of padding needed to make 64 bytes */
1717     count = 64 - 1 - count;
1718
1719     /* Pad out to 56 mod 64 */
1720     if (count < 8) {
1721         /* Two lots of padding:  Pad the first block to 64 bytes */
1722         memset(p, 0, count);
1723         byteReverse(ctx->in, 16);
1724         MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
1725
1726         /* Now fill the next block with 56 bytes */
1727         memset(ctx->in, 0, 56);
1728     } else {
1729         /* Pad block to 56 bytes */
1730         memset(p, 0, count - 8);
1731     }
1732     byteReverse(ctx->in, 14);
1733
1734     /* Append length in bits and transform */
1735     ((FcChar32 *) ctx->in)[14] = ctx->bits[0];
1736     ((FcChar32 *) ctx->in)[15] = ctx->bits[1];
1737
1738     MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
1739     byteReverse((unsigned char *) ctx->buf, 4);
1740     memcpy(digest, ctx->buf, 16);
1741     memset(ctx, 0, sizeof(ctx));        /* In case it's sensitive */
1742 }
1743
1744
1745 /* The four core functions - F1 is optimized somewhat */
1746
1747 /* #define F1(x, y, z) (x & y | ~x & z) */
1748 #define F1(x, y, z) (z ^ (x & (y ^ z)))
1749 #define F2(x, y, z) F1(z, x, y)
1750 #define F3(x, y, z) (x ^ y ^ z)
1751 #define F4(x, y, z) (y ^ (x | ~z))
1752
1753 /* This is the central step in the MD5 algorithm. */
1754 #define MD5STEP(f, w, x, y, z, data, s) \
1755         ( w += f(x, y, z) + data,  w = w<<s | w>>(32-s),  w += x )
1756
1757 /*
1758  * The core of the MD5 algorithm, this alters an existing MD5 hash to
1759  * reflect the addition of 16 longwords of new data.  MD5Update blocks
1760  * the data and converts bytes into longwords for this routine.
1761  */
1762 static void MD5Transform(FcChar32 buf[4], FcChar32 in[16])
1763 {
1764     register FcChar32 a, b, c, d;
1765
1766     a = buf[0];
1767     b = buf[1];
1768     c = buf[2];
1769     d = buf[3];
1770
1771     MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
1772     MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
1773     MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
1774     MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
1775     MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
1776     MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
1777     MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
1778     MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
1779     MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
1780     MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
1781     MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
1782     MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
1783     MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
1784     MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
1785     MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
1786     MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
1787
1788     MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
1789     MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
1790     MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
1791     MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
1792     MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
1793     MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
1794     MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
1795     MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
1796     MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
1797     MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
1798     MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
1799     MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
1800     MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
1801     MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
1802     MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
1803     MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
1804
1805     MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
1806     MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
1807     MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
1808     MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
1809     MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
1810     MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
1811     MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
1812     MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
1813     MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
1814     MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
1815     MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
1816     MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
1817     MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
1818     MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
1819     MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
1820     MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
1821
1822     MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
1823     MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
1824     MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
1825     MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
1826     MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
1827     MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
1828     MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
1829     MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
1830     MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
1831     MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
1832     MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
1833     MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
1834     MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
1835     MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
1836     MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
1837     MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
1838
1839     buf[0] += a;
1840     buf[1] += b;
1841     buf[2] += c;
1842     buf[3] += d;
1843 }