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     for (dir = cache->dirs; dir; dir = dir->next)
 505     {
 506         int i;
 507         const char * d;
 508         off_t off;
 509
 510         if (!dir->name || dir->state == FcGCDirDisabled)
 511             continue;
 512         d = (const char *)FcConfigNormalizeFontDir (config, (const FcChar8 *)dir->name);
 513         if (!d)
 514             continue;
 515
 516         if (dir->metadata.count && !dir->ent)
 517         {
 518             if (dir->state == FcGCDirUpdated || fd_orig < 0)
 519             {
 520                 fprintf(stderr, "Invalid metadata entry for %s, skipping...\n", d);
 521                 continue;
 522             }
 523             /* copy the old content */
 524             dir->ent = malloc (dir->metadata.count);
 525             if (!dir->ent)
 526             {
 527                 perror("malloc error");
 528                 continue;
 529             }
 530             off = FcCacheNextOffset (dir->offset + sizeof(FcCache));
 531             if (lseek (fd_orig, off, SEEK_SET) != off)
 532             {
 533                 perror("lseek");
 534                 free(dir->ent);
 535                 continue;
 536             }
 537             if (read (fd_orig, dir->ent, dir->metadata.count)
 538                 != dir->metadata.count)
 539             {
 540                 perror("read");
 541                 free(dir->ent);
 542                 continue;
 543             }
 544         }
 545
 546         FcCacheWriteString (fd, d);
 547
 548         for (i = 0; i < dir->subdirs->size; i++)
 549             FcCacheWriteString (fd, (char *)dir->subdirs->strs[i]);
 550         FcCacheWriteString (fd, "");
 551
 552         if (write (fd, &dir->metadata, sizeof(FcCache)) != sizeof(FcCache))
 553         {
 554             perror ("write metadata");
 555             free (dir->ent);
 556             continue;
 557         }
 558         off = FcCacheNextOffset (lseek(fd, 0, SEEK_CUR));
 559         if (lseek (fd, off, SEEK_SET) != off)
 560         {
 561             perror ("lseek");
 562             free (dir->ent);
 563             continue;
 564         }
 565         if (dir->metadata.count)
 566         {
 567             if (write (fd, dir->ent, dir->metadata.count) != dir->metadata.count)
 568             {
 569                 perror ("write dirent");
 570                 free (dir->ent);
 571                 continue;
 572             }
 573         }
 574         free (dir->ent);
 575     }
 576     FcCacheWriteString (fd, "");
 577
 578     if (close (fd) == -1)
 579         goto bail25;
 580
 581     close (fd_orig);
 582     fd_orig = -1;
 583
 584     if (!FcAtomicReplaceOrig (atomic))
 585         goto bail25;
 586
 587     FcAtomicUnlock (atomic);
 588     FcAtomicDestroy (atomic);
 589
 590     cache->updated = FcFalse;
 591     return FcTrue;
 592
 593  bail4:
 594     free (header);
 595  bail3:
 596     if (fd_orig != -1)
 597         close (fd_orig);
 598
 599     close (fd);
 600  bail25:
 601     FcAtomicDeleteNew (atomic);
 602  bail2:
 603     FcAtomicUnlock (atomic);
 604  bail1:
 605     FcAtomicDestroy (atomic);
 606     return FcFalse;
 607 }
 608
 609 /*
 610  * Find the next presumably-mmapable offset after the supplied file
 611  * position.
 612  */
 613 static int
 614 FcCacheNextOffset(off_t w)
 615 {
 616     static long pagesize = -1;
 617     if (pagesize == -1)
 618 #if defined (HAVE_SYSCONF)
 619         pagesize = sysconf(_SC_PAGESIZE);
 620 #else
 621         pagesize = FC_HARDCODED_PAGESIZE;
 622 #endif
 623     if (w % pagesize == 0)
 624         return w;
 625     else
 626         return ((w / pagesize)+1)*pagesize;
 627 }
 628
 629 /* return the address of the segment for the provided arch,
 630  * or -1 if arch not found */
 631 static off_t
 632 FcCacheSkipToArch (int fd, const char * arch)
 633 {
 634     char candidate_arch_machine_name_count[MACHINE_SIGNATURE_SIZE + 9];
 635     char * candidate_arch;
 636     off_t current_arch_start = 0;
 637
 638     lseek (fd, 0, SEEK_SET);
 639     FcCacheSkipString (fd);
 640     current_arch_start = lseek (fd, 0, SEEK_CUR);
 641
 642     /* skip arches that are not the current arch */
 643     while (1)
 644     {
 645         long bs;
 646
 647         if (lseek (fd, current_arch_start, SEEK_SET) != current_arch_start)
 648             return -1;
 649
 650         if (FcCacheReadString (fd, candidate_arch_machine_name_count,
 651                                 sizeof (candidate_arch_machine_name_count)) == 0)
 652             return -1;
 653         if (!strlen(candidate_arch_machine_name_count))
 654             return -1;
 655         bs = strtol(candidate_arch_machine_name_count, &candidate_arch, 16);
 656
 657         /* count = 0 should probably be distinguished from the !bs condition */
 658         if (!bs || bs < strlen (candidate_arch_machine_name_count))
 659             return -1;
 660
 661         candidate_arch++; /* skip leading space */
 662
 663         if (strcmp (candidate_arch, arch)==0)
 664             return current_arch_start;
 665         current_arch_start += bs;
 666         current_arch_start = FcCacheNextOffset (current_arch_start);
 667     }
 668 }
 669
 670 /* Cuts out the segment at the file pointer (moves everything else
 671  * down to cover it), and leaves the file pointer at the end of the
 672  * file. */
 673 static FcBool
 674 FcCacheCopyOld (int fd, int fd_orig, off_t start)
 675 {
 676     char * buf = malloc (8192);
 677     char candidate_arch_machine_name[MACHINE_SIGNATURE_SIZE + 9];
 678     long bs;
 679     int c, bytes_skipped;
 680     off_t loc;
 681
 682     if (!buf)
 683         return FcFalse;
 684
 685     loc = 0;
 686     lseek (fd, 0, SEEK_SET); lseek (fd_orig, 0, SEEK_SET);
 687     FcCacheSkipString (fd); FcCacheSkipString (fd_orig);
 688     do
 689     {
 690         int b = 8192;
 691         if (loc + b > start)
 692             b = start - loc;
 693
 694         if ((c = read (fd_orig, buf, b)) <= 0)
 695             break;
 696         if (write (fd, buf, c) < 0)
 697             goto bail;
 698
 699         loc += c;
 700     }
 701     while (c > 0);
 702
 703     lseek (fd, start, SEEK_SET);
 704     if (FcCacheReadString (fd, candidate_arch_machine_name,
 705                            sizeof (candidate_arch_machine_name)) == 0)
 706         goto done;
 707     if (!strlen(candidate_arch_machine_name))
 708         goto done;
 709
 710     bs = strtol(candidate_arch_machine_name, 0, 16);
 711     if (bs == 0)
 712         goto done;
 713
 714     bytes_skipped = 0;
 715     do
 716     {
 717         lseek (fd, start+bs+bytes_skipped, SEEK_SET);
 718         if ((c = read (fd, buf, 8192)) <= 0)
 719             break;
 720         lseek (fd, start+bytes_skipped, SEEK_SET);
 721         if (write (fd, buf, c) < 0)
 722             goto bail;
 723         bytes_skipped += c;
 724     }
 725     while (c > 0);
 726     lseek (fd, start+bytes_skipped, SEEK_SET);
 727
 728  done:
 729     free (buf);
 730     return FcTrue;
 731
 732  bail:
 733     free (buf);
 734     return FcFalse;
 735 }
 736
 737 /* Does not check that the cache has the appropriate arch section. */
 738 /* Also, this can be fooled if the original location has a stale
 739  * cache, and the hashed location has an up-to-date cache.  Oh well,
 740  * sucks to be you in that case! */
 741 FcBool
 742 FcDirCacheValid (const FcChar8 *dir)
 743 {
 744     struct stat file_stat, dir_stat;
 745     int         fd;
 746
 747     if (stat ((char *) dir, &dir_stat) < 0)
 748         return FcFalse;
 749
 750     fd = FcDirCacheOpen (dir);
 751
 752     if (fd < 0)
 753         return FcFalse;
 754     if (fstat (fd, &file_stat) < 0)
 755         goto bail;
 756
 757     close (fd);
 758
 759     /*
 760      * If the directory has been modified more recently than
 761      * the cache file, the cache is not valid
 762      */
 763     if (dir_stat.st_mtime > file_stat.st_mtime)
 764         return FcFalse;
 765
 766     return FcTrue;
 767
 768  bail:
 769     close (fd);
 770     return FcFalse;
 771 }
 772
 773 /* Assumes that the cache file in 'dir' exists.
 774  * Checks that the cache has the appropriate arch section. */
 775 FcBool
 776 FcDirCacheHasCurrentArch (const FcChar8 *dir)
 777 {
 778     int         fd;
 779     off_t       current_arch_start;
 780     char        *current_arch_machine_name;
 781     FcCache     metadata;
 782     char        subdirName[FC_MAX_FILE_LEN + 1 + 12 + 1];
 783
 784     fd = FcDirCacheOpen (dir);
 785     if (fd < 0)
 786         goto bail;
 787
 788     current_arch_machine_name = FcCacheMachineSignature();
 789     current_arch_start = FcCacheSkipToArch(fd, current_arch_machine_name);
 790
 791     if (current_arch_start >= 0)
 792     {
 793         if (lseek (fd, current_arch_start, SEEK_SET) != current_arch_start)
 794             goto bail1;
 795
 796         FcCacheSkipString (fd);
 797
 798         while (FcCacheReadString (fd, subdirName, sizeof (subdirName)) && strlen (subdirName) > 0)
 799             ;
 800
 801         if (read(fd, &metadata, sizeof(FcCache)) != sizeof(FcCache))
 802             goto bail1;
 803
 804         if (metadata.magic != FC_CACHE_MAGIC)
 805             goto bail1;
 806     }
 807
 808     close (fd);
 809
 810     if (current_arch_start < 0)
 811         return FcFalse;
 812
 813     return FcTrue;
 814
 815  bail1:
 816     close (fd);
 817  bail:
 818     return FcFalse;
 819 }
 820
 821 FcBool
 822 FcDirCacheUnlink (const FcChar8 *dir, FcConfig *config)
 823 {
 824     char        *cache_file;
 825     char        *cache_hashed = 0;
 826     int         fd, collisions;
 827     struct stat cache_stat;
 828     char        name_buf[FC_MAX_FILE_LEN];
 829
 830     dir = FcConfigNormalizeFontDir (config, dir);
 831     cache_file = (char *)FcStrPlus (dir, (FcChar8 *) "/" FC_DIR_CACHE_FILE);
 832     if (!cache_file)
 833         return FcFalse;
 834
 835     /* First remove normal cache file. */
 836     if (stat ((char *) cache_file, &cache_stat) == 0)
 837         unlink ((char *)cache_file);
 838
 839     /* Next remove any applicable hashed files. */
 840     fd = -1; collisions = 0;
 841     do
 842     {
 843         if (cache_hashed)
 844             FcStrFree ((FcChar8 *)cache_hashed);
 845
 846         cache_hashed = FcDirCacheHashName (cache_file, collisions++);
 847         if (!cache_hashed)
 848             goto bail;
 849
 850         if (fd > 0)
 851             close (fd);
 852         fd = open(cache_hashed, O_RDONLY | O_BINARY);
 853         if (fd == -1)
 854         {
 855             FcStrFree ((FcChar8 *)cache_file);
 856             return FcTrue;
 857         }
 858
 859         if (!FcCacheReadString (fd, name_buf, sizeof (name_buf)) || !strlen(name_buf))
 860         {
 861             FcStrFree ((FcChar8 *)cache_hashed);
 862             goto bail;
 863         }
 864     } while (strcmp (name_buf, cache_file) != 0);
 865
 866     close (fd);
 867
 868     if (stat ((char *) cache_hashed, &cache_stat) == 0 &&
 869         unlink ((char *)cache_hashed) != 0)
 870     {
 871         FcStrFree ((FcChar8 *)cache_hashed);
 872         goto bail;
 873     }
 874
 875     FcStrFree ((FcChar8 *)cache_file);
 876     FcStrFree ((FcChar8 *)cache_hashed);
 877     return FcTrue;
 878
 879  bail:
 880     FcStrFree ((FcChar8 *)cache_file);
 881     return FcFalse;
 882 }
 883
 884 static int
 885 FcCacheReadDirs (FcConfig * config, FcGlobalCache * cache,
 886                  FcStrList *list, FcFontSet * set, FcStrSet *processed_dirs)
 887 {
 888     int                 ret = 0;
 889     FcChar8             *dir;
 890     FcStrSet            *subdirs;
 891     FcStrList           *sublist;
 892     struct stat         statb;
 893     FcGlobalCacheDir   *d;
 894
 895     /*
 896      * Read in the results from 'list'.
 897      */
 898     while ((dir = FcStrListNext (list)))
 899     {
 900         if (!FcConfigAcceptFilename (config, dir))
 901             continue;
 902
 903         /* Skip this directory if already updated
 904          * to avoid the looped directories via symlinks
 905          * Clearly a dir not in fonts.conf shouldn't be globally cached.
 906          */
 907         dir = (FcChar8 *)FcConfigNormalizeFontDir (config, dir);
 908         if (!dir)
 909             continue;
 910
 911         if (FcStrSetMember (processed_dirs, dir))
 912             continue;
 913         if (!FcStrSetAdd (processed_dirs, dir))
 914             continue;
 915
 916         subdirs = FcStrSetCreate ();
 917         if (!subdirs)
 918         {
 919             fprintf (stderr, "Can't create directory set\n");
 920             ret++;
 921             continue;
 922         }
 923
 924         if (access ((char *) dir, X_OK) < 0)
 925         {
 926             switch (errno) {
 927             case ENOENT:
 928             case ENOTDIR:
 929             case EACCES:
 930                 break;
 931             default:
 932                 fprintf (stderr, "\"%s\": ", dir);
 933                 perror ("");
 934                 ret++;
 935             }
 936             FcStrSetDestroy (subdirs);
 937             continue;
 938         }
 939         if (stat ((char *) dir, &statb) == -1)
 940         {
 941             fprintf (stderr, "\"%s\": ", dir);
 942             perror ("");
 943             FcStrSetDestroy (subdirs);
 944             ret++;
 945             continue;
 946         }
 947         if (!S_ISDIR (statb.st_mode))
 948         {
 949             fprintf (stderr, "\"%s\": not a directory, skipping\n", dir);
 950             FcStrSetDestroy (subdirs);
 951             continue;
 952         }
 953         if (FcDirCacheValid (dir) &&
 954             FcDirCacheHasCurrentArch (dir) &&
 955             FcDirCacheRead (set, subdirs, dir, config))
 956         {
 957             /* if an old entry is found in the global cache, disable it */
 958             if ((d = FcGlobalCacheDirFind (cache, (const char *)dir)) != NULL)
 959             {
 960                 d->state = FcGCDirDisabled;
 961                 /* save the updated config later without this entry */
 962                 cache->updated = FcTrue;
 963             }
 964         }
 965         else
 966         {
 967             if (FcDebug () & FC_DBG_FONTSET)
 968                 printf ("cache scan dir %s\n", dir);
 969
 970             FcDirScanConfig (set, subdirs, cache,
 971                              config->blanks, dir, FcFalse, config);
 972         }
 973         sublist = FcStrListCreate (subdirs);
 974         FcStrSetDestroy (subdirs);
 975         if (!sublist)
 976         {
 977             fprintf (stderr, "Can't create subdir list in \"%s\"\n", dir);
 978             ret++;
 979             continue;
 980         }
 981         ret += FcCacheReadDirs (config, cache, sublist, set, processed_dirs);
 982     }
 983     FcStrListDone (list);
 984     return ret;
 985 }
 986
 987 FcFontSet *
 988 FcCacheRead (FcConfig *config, FcGlobalCache * cache)
 989 {
 990     FcFontSet   *s = FcFontSetCreate();
 991     FcStrSet    *processed_dirs;
 992
 993     if (!s)
 994         return 0;
 995
 996     processed_dirs = FcStrSetCreate();
 997     if (!processed_dirs)
 998         goto bail;
 999
1000     if (FcCacheReadDirs (config, cache, FcConfigGetConfigDirs (config), s, processed_dirs))
1001         goto bail1;
1002
1003     FcStrSetDestroy (processed_dirs);
1004     return s;
1005
1006  bail1:
1007     FcStrSetDestroy (processed_dirs);
1008  bail:
1009     FcFontSetDestroy (s);
1010     return 0;
1011 }
1012
1013 static const char bin2hex[] = { '0', '1', '2', '3',
1014                                 '4', '5', '6', '7',
1015                                 '8', '9', 'a', 'b',
1016                                 'c', 'd', 'e', 'f' };
1017
1018 static char *
1019 FcDirCacheHashName (char * cache_file, int collisions)
1020 {
1021     unsigned char       hash[16], hex_hash[33];
1022     char                *cache_hashed;
1023     unsigned char       uscore = '_';
1024     int                 cnt, i;
1025     FcChar8             *tmp;
1026     struct MD5Context   ctx;
1027
1028     MD5Init (&ctx);
1029     MD5Update (&ctx, (unsigned char *)cache_file, strlen (cache_file));
1030
1031     for (i = 0; i < collisions; i++)
1032         MD5Update (&ctx, &uscore, 1);
1033
1034     MD5Final (hash, &ctx);
1035
1036     for (cnt = 0; cnt < 16; ++cnt)
1037     {
1038         hex_hash[2*cnt] = bin2hex[hash[cnt] >> 4];
1039         hex_hash[2*cnt+1] = bin2hex[hash[cnt] & 0xf];
1040     }
1041     hex_hash[32] = 0;
1042
1043     tmp = FcStrPlus ((FcChar8 *)hex_hash, (FcChar8 *)FC_CACHE_SUFFIX);
1044     if (!tmp)
1045         return 0;
1046
1047     cache_hashed = (char *)FcStrPlus ((FcChar8 *)PKGCACHEDIR"/", tmp);
1048     free (tmp);
1049
1050     return cache_hashed;
1051 }
1052
1053 /* Opens the hashed name for cache_file.
1054  * This would fail in the unlikely event of a collision and subsequent
1055  * removal of the file which originally caused the collision. */
1056 static int
1057 FcDirCacheOpen (const FcChar8 *dir)
1058 {
1059     FcBool      found;
1060     int         fd = -1, collisions = 0;
1061     char        *cache_file, *cache_hashed;
1062     char        name_buf[FC_MAX_FILE_LEN];
1063     struct stat dir_stat;
1064
1065     if (stat ((char *)dir, &dir_stat) == -1)
1066         return -1;
1067
1068     cache_file = (char *)FcStrPlus (dir, (FcChar8 *) "/" FC_DIR_CACHE_FILE);
1069     if (!cache_file)
1070         return -1;
1071
1072     found = FcFalse;
1073     do
1074     {
1075         struct stat     c;
1076         FcChar8         *name_buf_dir;
1077
1078         if (fd >= 0)
1079             close (fd);
1080
1081         cache_hashed = FcDirCacheHashName (cache_file, collisions++);
1082         if (!cache_hashed)
1083         {
1084             FcStrFree ((FcChar8 *)cache_file);
1085             return -1;
1086         }
1087
1088         fd = open(cache_hashed, O_RDONLY | O_BINARY);
1089         FcStrFree ((FcChar8 *)cache_hashed);
1090
1091         if (fd == -1)
1092             break;
1093         if (!FcCacheReadString (fd, name_buf, sizeof (name_buf)) ||
1094             !strlen(name_buf))
1095             break;
1096
1097         name_buf_dir = FcStrDirname ((FcChar8 *)name_buf);
1098         if (stat ((char *)name_buf_dir, &c) == -1)
1099         {
1100             FcStrFree (name_buf_dir);
1101             continue;
1102         }
1103         FcStrFree (name_buf_dir);
1104         found = (c.st_ino == dir_stat.st_ino) && (c.st_dev == dir_stat.st_dev);
1105     } while (!found);
1106
1107     if (!found || fd < 0)
1108     {
1109         if (fd >= 0)
1110             close (fd);
1111         fd = open(cache_file, O_RDONLY | O_BINARY);
1112     }
1113
1114     FcStrFree ((FcChar8 *)cache_file);
1115     return fd;
1116 }
1117
1118 /* read serialized state from the cache file */
1119 FcBool
1120 FcDirCacheRead (FcFontSet * set, FcStrSet * dirs, const FcChar8 *dir, FcConfig *config)
1121 {
1122     int         fd;
1123     char        *current_arch_machine_name;
1124     char        candidate_arch_machine_name[9+MACHINE_SIGNATURE_SIZE];
1125     off_t       current_arch_start = 0;
1126     char        subdirName[FC_MAX_FILE_LEN + 1 + 12 + 1];
1127
1128     fd = FcDirCacheOpen (dir);
1129     if (fd < 0)
1130         goto bail;
1131
1132     current_arch_machine_name = FcCacheMachineSignature();
1133     current_arch_start = FcCacheSkipToArch(fd,
1134                                            current_arch_machine_name);
1135     if (current_arch_start < 0)
1136         goto bail1;
1137
1138     lseek (fd, current_arch_start, SEEK_SET);
1139     if (FcCacheReadString (fd, candidate_arch_machine_name,
1140                            sizeof (candidate_arch_machine_name)) == 0)
1141         goto bail1;
1142
1143     while (FcCacheReadString (fd, subdirName, sizeof (subdirName)) && strlen (subdirName) > 0)
1144         FcStrSetAdd (dirs, (FcChar8 *)subdirName);
1145
1146     if (!FcDirCacheConsume (fd, (const char *)dir, set, config))
1147         goto bail1;
1148
1149     close(fd);
1150     return FcTrue;
1151
1152  bail1:
1153     close (fd);
1154  bail:
1155     return FcFalse;
1156 }
1157
1158 static FcBool
1159 FcDirCacheConsume (int fd, const char * dir, FcFontSet *set, FcConfig *config)
1160 {
1161     FcCache metadata;
1162     void * current_dir_block;
1163     off_t pos;
1164
1165     if (read(fd, &metadata, sizeof(FcCache)) != sizeof(FcCache))
1166         return FcFalse;
1167     if (metadata.magic != FC_CACHE_MAGIC)
1168         return FcFalse;
1169
1170     if (!metadata.count)
1171     {
1172         pos = FcCacheNextOffset (lseek(fd, 0, SEEK_CUR));
1173         lseek (fd, pos, SEEK_SET);
1174         if (config)
1175             FcConfigAddFontDir (config, (FcChar8 *)dir);
1176         return FcTrue;
1177     }
1178
1179     pos = FcCacheNextOffset (lseek(fd, 0, SEEK_CUR));
1180 #if defined(HAVE_MMAP) || defined(__CYGWIN__)
1181     current_dir_block = mmap (0, metadata.count,
1182                               PROT_READ, MAP_SHARED, fd, pos);
1183     if (current_dir_block == MAP_FAILED)
1184         return FcFalse;
1185 #else
1186     current_dir_block = malloc (metadata.count);
1187     if (!current_dir_block)
1188         return FcFalse;
1189
1190     /* could also use CreateMappedViewOfFile under MinGW... */
1191     if (read (fd, current_dir_block, metadata.count) != metadata.count)
1192         goto bail;
1193 #endif
1194     lseek (fd, pos+metadata.count, SEEK_SET);
1195
1196     FcCacheAddBankDir (metadata.bank, dir);
1197     if (config)
1198         FcConfigAddFontDir (config, (FcChar8 *)dir);
1199
1200     if (!FcFontSetUnserialize (&metadata, set, current_dir_block))
1201         goto bail;
1202
1203     return FcTrue;
1204  bail:
1205 #if !(defined(HAVE_MMAP) || defined(__CYGWIN__))
1206     free (current_dir_block);
1207 #endif
1208     return FcFalse;
1209 }
1210
1211 static void *
1212 FcDirCacheProduce (FcFontSet *set, FcCache *metadata)
1213 {
1214     void * current_dir_block, * final_dir_block;
1215     static unsigned int rand_state = 0;
1216     int bank, needed_bytes_no_align;
1217
1218 #if defined (HAVE_RAND_R)
1219     if (!rand_state)
1220         rand_state = time(0L);
1221     bank = rand_r(&rand_state);
1222
1223     while (FcCacheHaveBank(bank))
1224         bank = rand_r(&rand_state);
1225 #else
1226     if (!rand_state)
1227     {
1228         rand_state = 1;
1229         srand (time (0L));
1230     }
1231     bank = rand();
1232
1233     while (FcCacheHaveBank(bank))
1234         bank = rand();
1235 #endif
1236
1237     memset (metadata, 0, sizeof(FcCache));
1238     FcFontSetNewBank();
1239     needed_bytes_no_align = FcFontSetNeededBytes (set);
1240     metadata->count = needed_bytes_no_align +
1241         FcFontSetNeededBytesAlign ();
1242     metadata->magic = FC_CACHE_MAGIC;
1243     metadata->bank = bank;
1244
1245     if (!needed_bytes_no_align) /* not a failure, no fonts to write */
1246     {
1247         /* no, you don't really need to write any bytes at all. */
1248         metadata->count = 0;
1249         return 0;
1250     }
1251
1252     current_dir_block = malloc (metadata->count);
1253     if (!current_dir_block)
1254         goto bail;
1255     /* shut up valgrind */
1256     memset (current_dir_block, 0, metadata->count);
1257     final_dir_block = FcFontSetDistributeBytes (metadata, current_dir_block);
1258
1259     if ((void *)((char *)current_dir_block+metadata->count) < final_dir_block)
1260         goto bail;
1261
1262     if (!FcFontSetSerialize (bank, set))
1263         goto bail;
1264
1265     return current_dir_block;
1266
1267  bail:
1268     free (current_dir_block);
1269     return 0;
1270 }
1271
1272 /* write serialized state to the cache file */
1273 FcBool
1274 FcDirCacheWrite (FcFontSet *set, FcStrSet *dirs, const FcChar8 *dir)
1275 {
1276     char            *cache_file;
1277     char            *cache_hashed;
1278     int             fd, fd_orig, i, dirs_count;
1279     FcAtomic        *atomic;
1280     FcCache         metadata;
1281     off_t           current_arch_start = 0, truncate_to;
1282     char            name_buf[FC_MAX_FILE_LEN];
1283     int             collisions;
1284
1285     char            *current_arch_machine_name, * header;
1286     void            *current_dir_block = 0;
1287
1288     dir = FcConfigNormalizeFontDir (FcConfigGetCurrent(), dir);
1289     if (!dir)
1290         return FcFalse;
1291
1292     cache_file = (char *)FcStrPlus (dir, (FcChar8 *) "/" FC_DIR_CACHE_FILE);
1293     if (!cache_file)
1294         goto bail;
1295
1296     /* Ensure that we're not trampling a cache for some other dir. */
1297     /* This is slightly different from FcDirCacheOpen, since it
1298      * needs the filename, not the file descriptor. */
1299     fd = -1; collisions = 0;
1300     do
1301     {
1302         cache_hashed = FcDirCacheHashName (cache_file, collisions++);
1303         if (!cache_hashed)
1304             goto bail0;
1305
1306         if (fd > 0)
1307             close (fd);
1308         fd = open(cache_hashed, O_RDONLY | O_BINARY);
1309         if (fd == -1)
1310             break;
1311         if(!FcCacheReadString (fd, name_buf, sizeof (name_buf)) || !strlen(name_buf))
1312         {
1313             close (fd);
1314             FcStrFree ((FcChar8 *)cache_hashed);
1315             continue;
1316         }
1317         close (fd);
1318
1319         if (strcmp (name_buf, cache_file) != 0)
1320         {
1321             FcStrFree ((FcChar8 *)cache_hashed);
1322             continue;
1323         }
1324
1325         break;
1326     } while (1);
1327
1328     current_dir_block = FcDirCacheProduce (set, &metadata);
1329
1330     if (metadata.count && !current_dir_block)
1331         goto bail1;
1332
1333     if (FcDebug () & FC_DBG_CACHE)
1334         printf ("FcDirCacheWriteDir cache_file \"%s\"\n", cache_file);
1335
1336     atomic = FcAtomicCreate ((FcChar8 *)cache_hashed);
1337     if (!atomic)
1338         goto bail1;
1339
1340     if (!FcAtomicLock (atomic))
1341     {
1342         /* Now try rewriting the original version of the file. */
1343         FcAtomicDestroy (atomic);
1344
1345         atomic = FcAtomicCreate ((FcChar8 *)cache_file);
1346         fd_orig = open (cache_file, O_RDONLY | O_BINARY);
1347         if (fd_orig == -1)
1348             fd_orig = open((char *)FcAtomicOrigFile (atomic), O_RDONLY | O_BINARY);
1349
1350         fd = open((char *)FcAtomicNewFile (atomic), O_RDWR | O_CREAT | O_BINARY, 0666);
1351         if (fd == -1)
1352             goto bail2;
1353     }
1354
1355     /* In all cases, try opening the real location of the cache file first. */
1356     /* (even if that's not atomic.) */
1357     fd_orig = open (cache_file, O_RDONLY | O_BINARY);
1358     if (fd_orig == -1)
1359         fd_orig = open((char *)FcAtomicOrigFile (atomic), O_RDONLY | O_BINARY);
1360
1361     fd = open((char *)FcAtomicNewFile (atomic), O_RDWR | O_CREAT | O_BINARY, 0666);
1362     if (fd == -1)
1363         goto bail3;
1364
1365     FcCacheWriteString (fd, cache_file);
1366
1367     current_arch_machine_name = FcCacheMachineSignature ();
1368     current_arch_start = 0;
1369
1370     if (fd_orig != -1)
1371         current_arch_start =
1372             FcCacheSkipToArch(fd_orig, current_arch_machine_name);
1373
1374     if (current_arch_start < 0)
1375     {
1376         off_t offset = lseek(fd_orig, 0, SEEK_END);
1377         current_arch_start = FcCacheNextOffset (offset);
1378     }
1379
1380     if (fd_orig != -1 && !FcCacheCopyOld(fd, fd_orig, current_arch_start))
1381         goto bail4;
1382
1383     if (fd_orig != -1)
1384         close (fd_orig);
1385
1386     current_arch_start = lseek(fd, 0, SEEK_CUR);
1387 #if defined (HAVE_FTRUNCATE)
1388     if (ftruncate (fd, current_arch_start) == -1)
1389         goto bail4;
1390 #else
1391 #if defined (HAVE_CHSIZE)
1392     if (chsize (fd, current_arch_start) == -1)
1393         goto bail4;
1394 #else
1395     goto bail4;
1396 #endif
1397 #endif
1398
1399     /* allocate space for subdir names in this block */
1400     dirs_count = 0;
1401     for (i = 0; i < dirs->size; i++)
1402         dirs_count += strlen((char *)dirs->strs[i]) + 1;
1403     dirs_count ++;
1404
1405     /* now write the address of the next offset */
1406     truncate_to = FcCacheNextOffset (FcCacheNextOffset (current_arch_start + sizeof (FcCache) + dirs_count) + metadata.count) - current_arch_start;
1407     header = malloc (10 + strlen (current_arch_machine_name));
1408     if (!header)
1409         goto bail4;
1410     sprintf (header, "%8x ", (int)truncate_to);
1411     strcat (header, current_arch_machine_name);
1412     if (!FcCacheWriteString (fd, header))
1413         goto bail5;
1414
1415     for (i = 0; i < dirs->size; i++)
1416         FcCacheWriteString (fd, (char *)dirs->strs[i]);
1417     FcCacheWriteString (fd, "");
1418
1419     if (write (fd, &metadata, sizeof(FcCache)) != sizeof(FcCache))
1420     {
1421         perror("write metadata");
1422         goto bail5;
1423     }
1424     if (metadata.count)
1425     {
1426         off_t off = FcCacheNextOffset (lseek(fd, 0, SEEK_END));
1427         if (lseek (fd, off, SEEK_SET) != off)
1428             perror("lseek");
1429         else if (write (fd, current_dir_block, metadata.count) !=
1430                  metadata.count)
1431             perror("write current_dir_block");
1432         free (current_dir_block);
1433         current_dir_block = 0;
1434     }
1435
1436     /* this actually serves to pad out the cache file, if needed */
1437 #if defined (HAVE_FTRUNCATE)
1438     if (ftruncate (fd, current_arch_start + truncate_to) == -1)
1439         goto bail5;
1440 #else
1441 #if defined (HAVE_CHSIZE)
1442     if (chsize (fd, current_arch_start + truncate_to) == -1)
1443         goto bail5;
1444 #else
1445     goto bail5;
1446 #endif
1447 #endif
1448
1449     free (header);
1450     close(fd);
1451     if (!FcAtomicReplaceOrig(atomic))
1452         goto bail3;
1453     FcStrFree ((FcChar8 *)cache_hashed);
1454     FcStrFree ((FcChar8 *)cache_file);
1455     FcAtomicUnlock (atomic);
1456     FcAtomicDestroy (atomic);
1457     return FcTrue;
1458
1459  bail5:
1460     free (header);
1461  bail4:
1462     close (fd);
1463  bail3:
1464     FcAtomicUnlock (atomic);
1465  bail2:
1466     FcAtomicDestroy (atomic);
1467  bail1:
1468     FcStrFree ((FcChar8 *)cache_hashed);
1469  bail0:
1470     unlink ((char *)cache_file);
1471     FcStrFree ((FcChar8 *)cache_file);
1472     if (current_dir_block)
1473         free (current_dir_block);
1474  bail:
1475     return FcFalse;
1476 }
1477
1478 static char *
1479 FcCacheMachineSignature ()
1480 {
1481     static char buf[MACHINE_SIGNATURE_SIZE];
1482     int32_t magic = ENDIAN_TEST;
1483     char * m = (char *)&magic;
1484
1485     sprintf (buf, "%2x%2x%2x%2x "
1486              "%4x %4x %4x %4x %4x %4x %4x %4x %4x %4x %4x %4x "
1487              "%4x %4x %4x %4x %4x %4x %4x %4x\n",
1488              m[0], m[1], m[2], m[3],
1489              (unsigned int)sizeof (char),
1490              (unsigned int)sizeof (char *),
1491              (unsigned int)sizeof (int),
1492              (unsigned int)sizeof (FcPattern),
1493              (unsigned int)sizeof (FcPatternEltPtr),
1494              (unsigned int)sizeof (struct _FcPatternElt *),
1495              (unsigned int)sizeof (FcPatternElt),
1496              (unsigned int)sizeof (FcObjectPtr),
1497              (unsigned int)sizeof (FcValueListPtr),
1498              (unsigned int)sizeof (FcValue),
1499              (unsigned int)sizeof (FcValueBinding),
1500              (unsigned int)sizeof (struct _FcValueList *),
1501              (unsigned int)sizeof (FcCharSet),
1502              (unsigned int)sizeof (FcCharLeaf **),
1503              (unsigned int)sizeof (FcChar16 *),
1504              (unsigned int)sizeof (FcChar16),
1505              (unsigned int)sizeof (FcCharLeaf),
1506              (unsigned int)sizeof (FcChar32),
1507              (unsigned int)sizeof (FcCache),
1508 #if defined (HAVE_SYSCONF)
1509              (unsigned int)sysconf(_SC_PAGESIZE));
1510 #else
1511              (unsigned int)FC_HARDCODED_PAGESIZE);
1512 #endif
1513
1514     return buf;
1515 }
1516
1517 static int banks_ptr = 0, banks_alloc = 0;
1518 int * _fcBankId = 0, * _fcBankIdx = 0;
1519 static const char ** bankDirs = 0;
1520
1521 static FcBool
1522 FcCacheHaveBank (int bank)
1523 {
1524     int i;
1525
1526     if (bank < FC_BANK_FIRST)
1527         return FcTrue;
1528
1529     for (i = 0; i < banks_ptr; i++)
1530         if (_fcBankId[i] == bank)
1531             return FcTrue;
1532
1533     return FcFalse;
1534 }
1535
1536 int
1537 FcCacheBankToIndexMTF (int bank)
1538 {
1539     int i, j;
1540
1541     for (i = 0; i < banks_ptr; i++)
1542         if (_fcBankId[_fcBankIdx[i]] == bank)
1543         {
1544             int t = _fcBankIdx[i];
1545
1546             for (j = i; j > 0; j--)
1547                 _fcBankIdx[j] = _fcBankIdx[j-1];
1548             _fcBankIdx[0] = t;
1549             return t;
1550         }
1551
1552     if (banks_ptr >= banks_alloc)
1553     {
1554         int * b, * bidx;
1555         const char ** bds;
1556
1557         b = realloc (_fcBankId, (banks_alloc + 4) * sizeof(int));
1558         if (!b)
1559             return -1;
1560         _fcBankId = b;
1561
1562         bidx = realloc (_fcBankIdx, (banks_alloc + 4) * sizeof(int));
1563         if (!bidx)
1564             return -1;
1565         _fcBankIdx = bidx;
1566
1567         bds = realloc (bankDirs, (banks_alloc + 4) * sizeof (char *));
1568         if (!bds)
1569             return -1;
1570         bankDirs = bds;
1571
1572         banks_alloc += 4;
1573     }
1574
1575     i = banks_ptr++;
1576     _fcBankId[i] = bank;
1577     _fcBankIdx[i] = i;
1578     return i;
1579 }
1580
1581 static void
1582 FcCacheAddBankDir (int bank, const char * dir)
1583 {
1584     int bi = FcCacheBankToIndexMTF (bank);
1585
1586     if (bi < 0)
1587         return;
1588
1589     bankDirs[bi] = (const char *)FcStrCopy ((FcChar8 *)dir);
1590 }
1591
1592 const char *
1593 FcCacheFindBankDir (int bank)
1594 {
1595     int bi = FcCacheBankToIndex (bank);
1596     return bankDirs[bi];
1597 }
1598
1599 /*
1600  * This code implements the MD5 message-digest algorithm.
1601  * The algorithm is due to Ron Rivest.  This code was
1602  * written by Colin Plumb in 1993, no copyright is claimed.
1603  * This code is in the public domain; do with it what you wish.
1604  *
1605  * Equivalent code is available from RSA Data Security, Inc.
1606  * This code has been tested against that, and is equivalent,
1607  * except that you don't need to include two pages of legalese
1608  * with every copy.
1609  *
1610  * To compute the message digest of a chunk of bytes, declare an
1611  * MD5Context structure, pass it to MD5Init, call MD5Update as
1612  * needed on buffers full of bytes, and then call MD5Final, which
1613  * will fill a supplied 16-byte array with the digest.
1614  */
1615
1616 #ifndef HIGHFIRST
1617 #define byteReverse(buf, len)   /* Nothing */
1618 #else
1619 /*
1620  * Note: this code is harmless on little-endian machines.
1621  */
1622 void byteReverse(unsigned char *buf, unsigned longs)
1623 {
1624     FcChar32 t;
1625     do {
1626         t = (FcChar32) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
1627             ((unsigned) buf[1] << 8 | buf[0]);
1628         *(FcChar32 *) buf = t;
1629         buf += 4;
1630     } while (--longs);
1631 }
1632 #endif
1633
1634 /*
1635  * Start MD5 accumulation.  Set bit count to 0 and buffer to mysterious
1636  * initialization constants.
1637  */
1638 static void MD5Init(struct MD5Context *ctx)
1639 {
1640     ctx->buf[0] = 0x67452301;
1641     ctx->buf[1] = 0xefcdab89;
1642     ctx->buf[2] = 0x98badcfe;
1643     ctx->buf[3] = 0x10325476;
1644
1645     ctx->bits[0] = 0;
1646     ctx->bits[1] = 0;
1647 }
1648
1649 /*
1650  * Update context to reflect the concatenation of another buffer full
1651  * of bytes.
1652  */
1653 static void MD5Update(struct MD5Context *ctx, unsigned char *buf, unsigned len)
1654 {
1655     FcChar32 t;
1656
1657     /* Update bitcount */
1658
1659     t = ctx->bits[0];
1660     if ((ctx->bits[0] = t + ((FcChar32) len << 3)) < t)
1661         ctx->bits[1]++;         /* Carry from low to high */
1662     ctx->bits[1] += len >> 29;
1663
1664     t = (t >> 3) & 0x3f;        /* Bytes already in shsInfo->data */
1665
1666     /* Handle any leading odd-sized chunks */
1667
1668     if (t) {
1669         unsigned char *p = (unsigned char *) ctx->in + t;
1670
1671         t = 64 - t;
1672         if (len < t) {
1673             memcpy(p, buf, len);
1674             return;
1675         }
1676         memcpy(p, buf, t);
1677         byteReverse(ctx->in, 16);
1678         MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
1679         buf += t;
1680         len -= t;
1681     }
1682     /* Process data in 64-byte chunks */
1683
1684     while (len >= 64) {
1685         memcpy(ctx->in, buf, 64);
1686         byteReverse(ctx->in, 16);
1687         MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
1688         buf += 64;
1689         len -= 64;
1690     }
1691
1692     /* Handle any remaining bytes of data. */
1693
1694     memcpy(ctx->in, buf, len);
1695 }
1696
1697 /*
1698  * Final wrapup - pad to 64-byte boundary with the bit pattern
1699  * 1 0* (64-bit count of bits processed, MSB-first)
1700  */
1701 static void MD5Final(unsigned char digest[16], struct MD5Context *ctx)
1702 {
1703     unsigned count;
1704     unsigned char *p;
1705
1706     /* Compute number of bytes mod 64 */
1707     count = (ctx->bits[0] >> 3) & 0x3F;
1708
1709     /* Set the first char of padding to 0x80.  This is safe since there is
1710        always at least one byte free */
1711     p = ctx->in + count;
1712     *p++ = 0x80;
1713
1714     /* Bytes of padding needed to make 64 bytes */
1715     count = 64 - 1 - count;
1716
1717     /* Pad out to 56 mod 64 */
1718     if (count < 8) {
1719         /* Two lots of padding:  Pad the first block to 64 bytes */
1720         memset(p, 0, count);
1721         byteReverse(ctx->in, 16);
1722         MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
1723
1724         /* Now fill the next block with 56 bytes */
1725         memset(ctx->in, 0, 56);
1726     } else {
1727         /* Pad block to 56 bytes */
1728         memset(p, 0, count - 8);
1729     }
1730     byteReverse(ctx->in, 14);
1731
1732     /* Append length in bits and transform */
1733     ((FcChar32 *) ctx->in)[14] = ctx->bits[0];
1734     ((FcChar32 *) ctx->in)[15] = ctx->bits[1];
1735
1736     MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
1737     byteReverse((unsigned char *) ctx->buf, 4);
1738     memcpy(digest, ctx->buf, 16);
1739     memset(ctx, 0, sizeof(ctx));        /* In case it's sensitive */
1740 }
1741
1742
1743 /* The four core functions - F1 is optimized somewhat */
1744
1745 /* #define F1(x, y, z) (x & y | ~x & z) */
1746 #define F1(x, y, z) (z ^ (x & (y ^ z)))
1747 #define F2(x, y, z) F1(z, x, y)
1748 #define F3(x, y, z) (x ^ y ^ z)
1749 #define F4(x, y, z) (y ^ (x | ~z))
1750
1751 /* This is the central step in the MD5 algorithm. */
1752 #define MD5STEP(f, w, x, y, z, data, s) \
1753         ( w += f(x, y, z) + data,  w = w<<s | w>>(32-s),  w += x )
1754
1755 /*
1756  * The core of the MD5 algorithm, this alters an existing MD5 hash to
1757  * reflect the addition of 16 longwords of new data.  MD5Update blocks
1758  * the data and converts bytes into longwords for this routine.
1759  */
1760 static void MD5Transform(FcChar32 buf[4], FcChar32 in[16])
1761 {
1762     register FcChar32 a, b, c, d;
1763
1764     a = buf[0];
1765     b = buf[1];
1766     c = buf[2];
1767     d = buf[3];
1768
1769     MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
1770     MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
1771     MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
1772     MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
1773     MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
1774     MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
1775     MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
1776     MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
1777     MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
1778     MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
1779     MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
1780     MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
1781     MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
1782     MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
1783     MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
1784     MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
1785
1786     MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
1787     MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
1788     MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
1789     MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
1790     MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
1791     MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
1792     MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
1793     MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
1794     MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
1795     MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
1796     MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
1797     MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
1798     MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
1799     MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
1800     MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
1801     MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
1802
1803     MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
1804     MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
1805     MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
1806     MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
1807     MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
1808     MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
1809     MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
1810     MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
1811     MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
1812     MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
1813     MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
1814     MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
1815     MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
1816     MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
1817     MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
1818     MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
1819
1820     MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
1821     MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
1822     MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
1823     MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
1824     MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
1825     MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
1826     MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
1827     MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
1828     MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
1829     MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
1830     MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
1831     MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
1832     MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
1833     MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
1834     MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
1835     MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
1836
1837     buf[0] += a;
1838     buf[1] += b;
1839     buf[2] += c;
1840     buf[3] += d;
1841 }