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 "fcint.h"
  27 #include <fcntl.h>
  28 #include <dirent.h>
  29 #include <string.h>
  30 #include <sys/types.h>
  31 #if defined(HAVE_MMAP) || defined(__CYGWIN__)
  32 #  include <unistd.h>
  33 #  include <sys/mman.h>
  34 #elif defined(_WIN32)
  35 #  include <windows.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 (FcConfig *config, const FcChar8 *dir, FcChar8 **cache_path);
  49
  50 static off_t
  51 FcCacheSkipToArch (int fd, const char * arch);
  52
  53 static FcBool
  54 FcCacheCopyOld (int fd, int fd_orig, off_t start);
  55
  56 static void *
  57 FcDirCacheProduce (FcFontSet *set, FcCache * metadata);
  58
  59 static FcBool
  60 FcDirCacheConsume (int fd, const char * dir, FcFontSet *set, FcConfig *config);
  61
  62 static int
  63 FcCacheNextOffset(off_t w);
  64
  65 static char *
  66 FcCacheMachineSignature (void);
  67
  68 static FcBool
  69 FcCacheHaveBank (int bank);
  70
  71 static void
  72 FcCacheAddBankDir (int bank, const char * dir);
  73
  74 struct MD5Context {
  75         FcChar32 buf[4];
  76         FcChar32 bits[2];
  77         unsigned char in[64];
  78 };
  79
  80 static void MD5Init(struct MD5Context *ctx);
  81 static void MD5Update(struct MD5Context *ctx, unsigned char *buf, unsigned len);
  82 static void MD5Final(unsigned char digest[16], struct MD5Context *ctx);
  83 static void MD5Transform(FcChar32 buf[4], FcChar32 in[16]);
  84
  85 #define FC_DBG_CACHE_REF    1024
  86
  87 static char *
  88 FcCacheReadString (int fd, char *dest, int len)
  89 {
  90     int    size;
  91     int    slen;
  92
  93     if (len == 0)
  94         return 0;
  95
  96     size = read (fd, dest, len-1);
  97
  98     if (size > 0)
  99     {
 100         dest[size] = '\0';
 101         slen = strlen (dest);
 102
 103         lseek (fd, slen - size + 1, SEEK_CUR);
 104         return slen < len ? dest : 0;
 105     }
 106
 107     return 0;
 108 }
 109
 110 static void
 111 FcCacheSkipString (int fd)
 112 {
 113     char buf[256];
 114     int  size;
 115     int  slen;
 116
 117     while ( (size = read (fd, buf, sizeof (buf)-1)) > 0)
 118     {
 119         buf [size] = '\0';
 120         slen = strlen (buf);
 121         if (slen < size)
 122         {
 123             lseek (fd, slen - size + 1, SEEK_CUR);
 124             return;
 125         }
 126     }
 127 }
 128
 129 static FcBool
 130 FcCacheWriteString (int fd, const char *chars)
 131 {
 132     if (write (fd, chars, strlen(chars)+1) != strlen(chars)+1)
 133         return FcFalse;
 134     return FcTrue;
 135 }
 136
 137 static void
 138 FcGlobalCacheDirDestroy (FcGlobalCacheDir *d)
 139 {
 140     FcStrSetDestroy (d->subdirs);
 141     FcMemFree (FC_MEM_STRING, strlen (d->name)+1);
 142     free (d->name);
 143     FcMemFree (FC_MEM_CACHE, sizeof (FcGlobalCacheDir));
 144     free (d);
 145 }
 146
 147 FcGlobalCache *
 148 FcGlobalCacheCreate (void)
 149 {
 150     FcGlobalCache   *cache;
 151
 152     cache = malloc (sizeof (FcGlobalCache));
 153     if (!cache)
 154         return 0;
 155     FcMemAlloc (FC_MEM_CACHE, sizeof (FcGlobalCache));
 156     cache->dirs = 0;
 157     cache->updated = FcFalse;
 158     cache->fd = -1;
 159     return cache;
 160 }
 161
 162 void
 163 FcGlobalCacheDestroy (FcGlobalCache *cache)
 164 {
 165     FcGlobalCacheDir    *d, *next;
 166
 167     for (d = cache->dirs; d; d = next)
 168     {
 169         next = d->next;
 170         FcGlobalCacheDirDestroy (d);
 171     }
 172     FcMemFree (FC_MEM_CACHE, sizeof (FcGlobalCache));
 173     if (cache->fd != -1)
 174         close (cache->fd);
 175     free (cache);
 176 }
 177
 178 void
 179 FcGlobalCacheLoad (FcGlobalCache    *cache,
 180                    FcStrSet         *staleDirs,
 181                    const FcChar8    *cache_file,
 182                    FcConfig         *config)
 183 {
 184     char                name_buf[FC_MAX_FILE_LEN];
 185     FcGlobalCacheDir    *d, *next;
 186     FcFileTime          config_time = FcConfigModifiedTime (config);
 187     char                * current_arch_machine_name;
 188     char                candidate_arch_machine_name[MACHINE_SIGNATURE_SIZE + 9];
 189     off_t               current_arch_start;
 190
 191     struct stat         cache_stat, dir_stat;
 192     char                subdirName[FC_MAX_FILE_LEN + 1 + 12 + 1];
 193
 194     if (stat ((char *) cache_file, &cache_stat) < 0)
 195         return;
 196
 197     cache->fd = open ((char *) cache_file, O_RDONLY | O_BINARY);
 198     if (cache->fd == -1)
 199         return;
 200
 201     cache->updated = FcFalse;
 202
 203     if (!FcCacheReadString (cache->fd, name_buf, sizeof (name_buf)))
 204         goto bail_and_destroy;
 205     if (strcmp (name_buf, FC_GLOBAL_MAGIC_COOKIE) != 0)
 206         goto bail_and_destroy;
 207
 208     current_arch_machine_name = FcCacheMachineSignature ();
 209     current_arch_start = FcCacheSkipToArch(cache->fd,
 210                                            current_arch_machine_name);
 211     if (current_arch_start < 0)
 212         goto bail1;
 213
 214     lseek (cache->fd, current_arch_start, SEEK_SET);
 215     if (!FcCacheReadString (cache->fd, candidate_arch_machine_name,
 216                             sizeof (candidate_arch_machine_name)))
 217         goto bail_and_destroy;
 218     if (strlen(candidate_arch_machine_name) == 0)
 219         goto bail_and_destroy;
 220
 221     while (1)
 222     {
 223         off_t targ;
 224
 225         if (!FcCacheReadString (cache->fd, name_buf, sizeof (name_buf)) ||
 226             !strlen(name_buf))
 227             break;
 228
 229         /* Directory must be older than the global cache file; also
 230            cache must be newer than the config file. */
 231         if (stat ((char *) name_buf, &dir_stat) < 0 ||
 232             dir_stat.st_mtime > cache_stat.st_mtime ||
 233             (config_time.set && cache_stat.st_mtime < config_time.time))
 234         {
 235             FcCache md;
 236             off_t off;
 237
 238             FcStrSetAdd (staleDirs, (FcChar8 *)name_buf);
 239
 240             /* skip subdirs */
 241             while (FcCacheReadString (cache->fd, subdirName,
 242                                       sizeof (subdirName)) &&
 243                    strlen (subdirName))
 244                 ;
 245
 246             if (read (cache->fd, &md, sizeof (FcCache)) != sizeof(FcCache))
 247             {
 248                 perror ("read metadata");
 249                 goto bail1;
 250             }
 251             off = FcCacheNextOffset (lseek(cache->fd, 0, SEEK_CUR)) + md.count;
 252             if (lseek (cache->fd, off, SEEK_SET) != off)
 253             {
 254                 perror ("lseek");
 255                 goto bail1;
 256             }
 257             continue;
 258         }
 259
 260         d = malloc (sizeof (FcGlobalCacheDir));
 261         if (!d)
 262             goto bail1;
 263
 264         d->next = cache->dirs;
 265         cache->dirs = d;
 266
 267         d->name = (char *)FcStrCopy ((FcChar8 *)name_buf);
 268         d->ent = 0;
 269         d->state = FcGCDirFileRead;
 270
 271         d->subdirs = FcStrSetCreate();
 272         do
 273         {
 274             if (!FcCacheReadString (cache->fd, subdirName,
 275                                     sizeof (subdirName)) ||
 276                 !strlen (subdirName))
 277                 break;
 278             FcStrSetAdd (d->subdirs, (FcChar8 *)subdirName);
 279         } while (1);
 280
 281         d->offset = lseek (cache->fd, 0, SEEK_CUR);
 282         if (read (cache->fd, &d->metadata, sizeof (FcCache)) != sizeof (FcCache))
 283             goto bail1;
 284         targ = FcCacheNextOffset (lseek(cache->fd, 0, SEEK_CUR)) + d->metadata.count;
 285         if (lseek (cache->fd, targ, SEEK_SET) != targ)
 286             goto bail1;
 287     }
 288     return;
 289
 290  bail1:
 291     for (d = cache->dirs; d; d = next)
 292     {
 293         next = d->next;
 294         free (d);
 295     }
 296     cache->dirs = 0;
 297
 298     close (cache->fd);
 299     cache->fd = -1;
 300     return;
 301
 302  bail_and_destroy:
 303     close (cache->fd);
 304     cache->fd = -1;
 305
 306     if (stat ((char *) cache_file, &cache_stat) == 0)
 307         unlink ((char *)cache_file);
 308
 309     return;
 310
 311 }
 312
 313 FcBool
 314 FcGlobalCacheReadDir (FcFontSet *set, FcStrSet *dirs, FcGlobalCache * cache, const char *dir, FcConfig *config)
 315 {
 316     FcGlobalCacheDir    *d;
 317     int                 i;
 318
 319     if (cache->fd == -1)
 320         return FcFalse;
 321
 322     if (config)
 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
 620     if (w == -1)
 621         return w;
 622
 623     if (pagesize == -1)
 624 #if defined (HAVE_SYSCONF)
 625         pagesize = sysconf(_SC_PAGESIZE);
 626 #else
 627         pagesize = FC_HARDCODED_PAGESIZE;
 628 #endif
 629     if (w % pagesize == 0)
 630         return w;
 631     else
 632         return ((w / pagesize)+1)*pagesize;
 633 }
 634
 635 /* return the address of the segment for the provided arch,
 636  * or -1 if arch not found */
 637 static off_t
 638 FcCacheSkipToArch (int fd, const char * arch)
 639 {
 640     char candidate_arch_machine_name_count[MACHINE_SIGNATURE_SIZE + 9];
 641     char * candidate_arch;
 642     off_t current_arch_start = 0;
 643
 644     lseek (fd, 0, SEEK_SET);
 645     FcCacheSkipString (fd);
 646     current_arch_start = lseek (fd, 0, SEEK_CUR);
 647
 648     /* skip arches that are not the current arch */
 649     while (1)
 650     {
 651         long bs;
 652
 653         if (lseek (fd, current_arch_start, SEEK_SET) != current_arch_start)
 654             return -1;
 655
 656         if (FcCacheReadString (fd, candidate_arch_machine_name_count,
 657                                 sizeof (candidate_arch_machine_name_count)) == 0)
 658             return -1;
 659         if (!strlen(candidate_arch_machine_name_count))
 660             return -1;
 661         bs = strtol(candidate_arch_machine_name_count, &candidate_arch, 16);
 662
 663         /* count = 0 should probably be distinguished from the !bs condition */
 664         if (!bs || bs < strlen (candidate_arch_machine_name_count))
 665             return -1;
 666
 667         candidate_arch++; /* skip leading space */
 668
 669         if (strcmp (candidate_arch, arch)==0)
 670             return current_arch_start;
 671         current_arch_start += bs;
 672         current_arch_start = FcCacheNextOffset (current_arch_start);
 673     }
 674 }
 675
 676 /* Cuts out the segment at the file pointer (moves everything else
 677  * down to cover it), and leaves the file pointer at the end of the
 678  * file. */
 679 static FcBool
 680 FcCacheCopyOld (int fd, int fd_orig, off_t start)
 681 {
 682     char * buf = malloc (8192);
 683     char candidate_arch_machine_name[MACHINE_SIGNATURE_SIZE + 9];
 684     long bs;
 685     int c, bytes_skipped;
 686     off_t loc;
 687
 688     if (!buf)
 689         return FcFalse;
 690
 691     loc = 0;
 692     lseek (fd, 0, SEEK_SET); lseek (fd_orig, 0, SEEK_SET);
 693     FcCacheSkipString (fd); FcCacheSkipString (fd_orig);
 694     do
 695     {
 696         int b = 8192;
 697         if (loc + b > start)
 698             b = start - loc;
 699
 700         if ((c = read (fd_orig, buf, b)) <= 0)
 701             break;
 702         if (write (fd, buf, c) < 0)
 703             goto bail;
 704
 705         loc += c;
 706     }
 707     while (c > 0);
 708
 709     lseek (fd, start, SEEK_SET);
 710     if (FcCacheReadString (fd, candidate_arch_machine_name,
 711                            sizeof (candidate_arch_machine_name)) == 0)
 712         goto done;
 713     if (!strlen(candidate_arch_machine_name))
 714         goto done;
 715
 716     bs = strtol(candidate_arch_machine_name, 0, 16);
 717     if (bs == 0)
 718         goto done;
 719
 720     bytes_skipped = 0;
 721     do
 722     {
 723         lseek (fd, start+bs+bytes_skipped, SEEK_SET);
 724         if ((c = read (fd, buf, 8192)) <= 0)
 725             break;
 726         lseek (fd, start+bytes_skipped, SEEK_SET);
 727         if (write (fd, buf, c) < 0)
 728             goto bail;
 729         bytes_skipped += c;
 730     }
 731     while (c > 0);
 732     lseek (fd, start+bytes_skipped, SEEK_SET);
 733
 734  done:
 735     free (buf);
 736     return FcTrue;
 737
 738  bail:
 739     free (buf);
 740     return FcFalse;
 741 }
 742
 743 /* Does not check that the cache has the appropriate arch section. */
 744 FcBool
 745 FcDirCacheValid (const FcChar8 *dir, FcConfig *config)
 746 {
 747     int         fd;
 748
 749     fd = FcDirCacheOpen (config, dir, NULL);
 750
 751     if (fd < 0)
 752         return FcFalse;
 753     close (fd);
 754
 755     return FcTrue;
 756 }
 757
 758 /* Assumes that the cache file in 'dir' exists.
 759  * Checks that the cache has the appropriate arch section. */
 760 FcBool
 761 FcDirCacheHasCurrentArch (const FcChar8 *dir, FcConfig *config)
 762 {
 763     int         fd;
 764     off_t       current_arch_start;
 765     char        *current_arch_machine_name;
 766     FcCache     metadata;
 767     char        subdirName[FC_MAX_FILE_LEN + 1 + 12 + 1];
 768
 769     fd = FcDirCacheOpen (config, dir, NULL);
 770     if (fd < 0)
 771         goto bail;
 772
 773     current_arch_machine_name = FcCacheMachineSignature();
 774     current_arch_start = FcCacheSkipToArch(fd, current_arch_machine_name);
 775
 776     if (current_arch_start >= 0)
 777     {
 778         if (lseek (fd, current_arch_start, SEEK_SET) != current_arch_start)
 779             goto bail1;
 780
 781         FcCacheSkipString (fd);
 782
 783         while (FcCacheReadString (fd, subdirName, sizeof (subdirName)) && strlen (subdirName) > 0)
 784             ;
 785
 786         if (read(fd, &metadata, sizeof(FcCache)) != sizeof(FcCache))
 787             goto bail1;
 788
 789         if (metadata.magic != FC_CACHE_MAGIC)
 790             goto bail1;
 791     }
 792
 793     close (fd);
 794
 795     if (current_arch_start < 0)
 796         return FcFalse;
 797
 798     return FcTrue;
 799
 800  bail1:
 801     close (fd);
 802  bail:
 803     return FcFalse;
 804 }
 805
 806 #define CACHEBASE_LEN (1 + 32 + sizeof (FC_CACHE_SUFFIX))
 807
 808 static const char bin2hex[] = { '0', '1', '2', '3',
 809                                 '4', '5', '6', '7',
 810                                 '8', '9', 'a', 'b',
 811                                 'c', 'd', 'e', 'f' };
 812
 813 static FcChar8 *
 814 FcDirCacheBasename (const FcChar8 * dir, FcChar8 cache_base[CACHEBASE_LEN])
 815 {
 816     unsigned char       hash[16];
 817     FcChar8             *hex_hash;
 818     int                 cnt;
 819     struct MD5Context   ctx;
 820
 821     MD5Init (&ctx);
 822     MD5Update (&ctx, (unsigned char *)dir, strlen ((char *) dir));
 823
 824     MD5Final (hash, &ctx);
 825
 826     cache_base[0] = '/';
 827     hex_hash = cache_base + 1;
 828     for (cnt = 0; cnt < 16; ++cnt)
 829     {
 830         hex_hash[2*cnt  ] = bin2hex[hash[cnt] >> 4];
 831         hex_hash[2*cnt+1] = bin2hex[hash[cnt] & 0xf];
 832     }
 833     hex_hash[2*cnt] = 0;
 834     strcat ((char *) cache_base, FC_CACHE_SUFFIX);
 835
 836     return cache_base;
 837 }
 838
 839 FcBool
 840 FcDirCacheUnlink (const FcChar8 *dir, FcConfig *config)
 841 {
 842     int         fd = -1;
 843     FcChar8     *cache_hashed = NULL;
 844     FcChar8     cache_base[CACHEBASE_LEN];
 845     FcStrList   *list;
 846     FcChar8     *cache_dir;
 847     char        dir_buf[FC_MAX_FILE_LEN];
 848
 849     dir = FcConfigNormalizeFontDir (config, dir);
 850
 851     FcDirCacheBasename (dir, cache_base);
 852
 853     list = FcStrListCreate (config->cacheDirs);
 854     if (!list)
 855         return FcFalse;
 856
 857     while ((cache_dir = FcStrListNext (list)))
 858     {
 859         cache_hashed = FcStrPlus (cache_dir, cache_base);
 860         if (!cache_hashed)
 861             break;
 862         fd = open((char *) cache_hashed, O_RDONLY | O_BINARY);
 863         FcStrFree (cache_hashed);
 864         if (fd >= 0)
 865         {
 866             if (FcCacheReadString (fd, dir_buf, sizeof (dir_buf)) &&
 867                 strcmp (dir_buf, (char *) dir) == 0)
 868             {
 869                 close (fd);
 870                 if (unlink ((char *) cache_hashed) < 0)
 871                     break;
 872             } else
 873                 close (fd);
 874         }
 875     }
 876     FcStrListDone (list);
 877     /* return FcFalse if something went wrong */
 878     if (cache_dir)
 879         return FcFalse;
 880     return FcTrue;
 881 }
 882
 883 static int
 884 FcCacheReadDirs (FcConfig * config, FcGlobalCache * cache,
 885                  FcStrList *list, FcFontSet * set, FcStrSet *processed_dirs)
 886 {
 887     int                 ret = 0;
 888     FcChar8             *dir;
 889     FcStrSet            *subdirs;
 890     FcStrList           *sublist;
 891     struct stat         statb;
 892     FcGlobalCacheDir   *d;
 893
 894     /*
 895      * Read in the results from 'list'.
 896      */
 897     while ((dir = FcStrListNext (list)))
 898     {
 899         if (!FcConfigAcceptFilename (config, dir))
 900             continue;
 901
 902         /* Skip this directory if already updated
 903          * to avoid the looped directories via symlinks
 904          * Clearly a dir not in fonts.conf shouldn't be globally cached.
 905          */
 906         dir = (FcChar8 *)FcConfigNormalizeFontDir (config, dir);
 907         if (!dir)
 908             continue;
 909
 910         if (FcStrSetMember (processed_dirs, dir))
 911             continue;
 912         if (!FcStrSetAdd (processed_dirs, dir))
 913             continue;
 914
 915         subdirs = FcStrSetCreate ();
 916         if (!subdirs)
 917         {
 918             fprintf (stderr, "Can't create directory set\n");
 919             ret++;
 920             continue;
 921         }
 922
 923         if (access ((char *) dir, X_OK) < 0)
 924         {
 925             switch (errno) {
 926             case ENOENT:
 927             case ENOTDIR:
 928             case EACCES:
 929                 break;
 930             default:
 931                 fprintf (stderr, "\"%s\": ", dir);
 932                 perror ("");
 933                 ret++;
 934             }
 935             FcStrSetDestroy (subdirs);
 936             continue;
 937         }
 938         if (stat ((char *) dir, &statb) == -1)
 939         {
 940             fprintf (stderr, "\"%s\": ", dir);
 941             perror ("");
 942             FcStrSetDestroy (subdirs);
 943             ret++;
 944             continue;
 945         }
 946         if (!S_ISDIR (statb.st_mode))
 947         {
 948             fprintf (stderr, "\"%s\": not a directory, skipping\n", dir);
 949             FcStrSetDestroy (subdirs);
 950             continue;
 951         }
 952         if (FcDirCacheRead (set, subdirs, dir, config))
 953         {
 954             /* if an old entry is found in the global cache, disable it */
 955             if ((d = FcGlobalCacheDirFind (cache, (const char *)dir)) != NULL)
 956             {
 957                 d->state = FcGCDirDisabled;
 958                 /* save the updated config later without this entry */
 959                 cache->updated = FcTrue;
 960             }
 961         }
 962         else
 963         {
 964             if (FcDebug () & FC_DBG_FONTSET)
 965                 printf ("cache scan dir %s\n", dir);
 966
 967             FcDirScanConfig (set, subdirs, cache,
 968                              config->blanks, dir, FcFalse, config);
 969         }
 970         sublist = FcStrListCreate (subdirs);
 971         FcStrSetDestroy (subdirs);
 972         if (!sublist)
 973         {
 974             fprintf (stderr, "Can't create subdir list in \"%s\"\n", dir);
 975             ret++;
 976             continue;
 977         }
 978         ret += FcCacheReadDirs (config, cache, sublist, set, processed_dirs);
 979     }
 980     FcStrListDone (list);
 981     return ret;
 982 }
 983
 984 FcFontSet *
 985 FcCacheRead (FcConfig *config, FcGlobalCache * cache)
 986 {
 987     FcFontSet   *s = FcFontSetCreate();
 988     FcStrSet    *processed_dirs;
 989
 990     if (!s)
 991         return 0;
 992
 993     processed_dirs = FcStrSetCreate();
 994     if (!processed_dirs)
 995         goto bail;
 996
 997     if (FcCacheReadDirs (config, cache, FcConfigGetConfigDirs (config), s, processed_dirs))
 998         goto bail1;
 999
1000     FcStrSetDestroy (processed_dirs);
1001     return s;
1002
1003  bail1:
1004     FcStrSetDestroy (processed_dirs);
1005  bail:
1006     FcFontSetDestroy (s);
1007     return 0;
1008 }
1009
1010 /* Opens the cache file for 'dir' for reading.
1011  * This searches the list of cache dirs for the relevant cache file,
1012  * returning the first one found.
1013  */
1014 static int
1015 FcDirCacheOpen (FcConfig *config, const FcChar8 *dir, FcChar8 **cache_path)
1016 {
1017     int         fd = -1;
1018     FcChar8     *cache_hashed = NULL;
1019     FcChar8     cache_base[CACHEBASE_LEN];
1020     FcStrList   *list;
1021     FcChar8     *cache_dir;
1022     char        dir_buf[FC_MAX_FILE_LEN];
1023     struct stat file_stat, dir_stat;
1024
1025     if (stat ((char *) dir, &dir_stat) < 0)
1026         return -1;
1027
1028     FcDirCacheBasename (dir, cache_base);
1029
1030     list = FcStrListCreate (config->cacheDirs);
1031     if (!list)
1032         return -1;
1033
1034     while ((cache_dir = FcStrListNext (list)))
1035     {
1036         cache_hashed = FcStrPlus (cache_dir, cache_base);
1037         if (!cache_hashed)
1038             break;
1039         fd = open((char *) cache_hashed, O_RDONLY | O_BINARY);
1040         if (fd >= 0) {
1041             if (fstat (fd, &file_stat) >= 0 &&
1042                 dir_stat.st_mtime <= file_stat.st_mtime)
1043             {
1044                 break;
1045             }
1046             close (fd);
1047             fd = -1;
1048         }
1049         FcStrFree (cache_hashed);
1050         cache_hashed = NULL;
1051     }
1052     FcStrListDone (list);
1053
1054     if (fd < 0)
1055         return -1;
1056
1057     if (!FcCacheReadString (fd, dir_buf, sizeof (dir_buf)) ||
1058         strcmp (dir_buf, (char *) dir) != 0)
1059     {
1060         close (fd);
1061         FcStrFree (cache_hashed);
1062         return -1;
1063     }
1064
1065     if (cache_path)
1066         *cache_path = cache_hashed;
1067     else
1068         FcStrFree (cache_hashed);
1069
1070     return fd;
1071 }
1072
1073 /* read serialized state from the cache file */
1074 FcBool
1075 FcDirCacheRead (FcFontSet * set, FcStrSet * dirs, const FcChar8 *dir, FcConfig *config)
1076 {
1077     int         fd;
1078     char        *current_arch_machine_name;
1079     char        candidate_arch_machine_name[9+MACHINE_SIGNATURE_SIZE];
1080     off_t       current_arch_start = 0;
1081     char        subdirName[FC_MAX_FILE_LEN + 1 + 12 + 1];
1082
1083     fd = FcDirCacheOpen (config, dir, NULL);
1084     if (fd < 0)
1085         goto bail;
1086
1087     current_arch_machine_name = FcCacheMachineSignature();
1088     current_arch_start = FcCacheSkipToArch(fd,
1089                                            current_arch_machine_name);
1090     if (current_arch_start < 0)
1091         goto bail1;
1092
1093     lseek (fd, current_arch_start, SEEK_SET);
1094     if (FcCacheReadString (fd, candidate_arch_machine_name,
1095                            sizeof (candidate_arch_machine_name)) == 0)
1096         goto bail1;
1097
1098     while (FcCacheReadString (fd, subdirName, sizeof (subdirName)) && strlen (subdirName) > 0)
1099         FcStrSetAdd (dirs, (FcChar8 *)subdirName);
1100
1101     if (!FcDirCacheConsume (fd, (const char *)dir, set, config))
1102         goto bail1;
1103
1104     close(fd);
1105     return FcTrue;
1106
1107  bail1:
1108     close (fd);
1109  bail:
1110     return FcFalse;
1111 }
1112
1113 static FcBool
1114 FcDirCacheConsume (int fd, const char * dir, FcFontSet *set, FcConfig *config)
1115 {
1116     FcCache metadata;
1117     void * current_dir_block;
1118     off_t pos, endpos;
1119
1120     if (read(fd, &metadata, sizeof(FcCache)) != sizeof(FcCache))
1121         return FcFalse;
1122     if (metadata.magic != FC_CACHE_MAGIC)
1123         return FcFalse;
1124
1125     if (!metadata.count)
1126     {
1127         pos = FcCacheNextOffset (lseek(fd, 0, SEEK_CUR));
1128         lseek (fd, pos, SEEK_SET);
1129         if (config)
1130             FcConfigAddFontDir (config, (FcChar8 *)dir);
1131         return FcTrue;
1132     }
1133
1134     pos = FcCacheNextOffset (lseek(fd, 0, SEEK_CUR));
1135
1136     /* This is not failsafe (multi-arches can break it),
1137      * but fd has got to have at least as many bytes as
1138      * metadata.count, or something's going to go horribly wrong. */
1139     if (pos == (off_t)-1)
1140         return FcFalse;
1141
1142     endpos = lseek (fd, 0, SEEK_END);
1143     if (endpos == (off_t)-1 || endpos - pos < metadata.count)
1144         return FcFalse;
1145     if (lseek (fd, pos, SEEK_SET) == -1)
1146         return FcFalse;
1147
1148 #if defined(HAVE_MMAP) || defined(__CYGWIN__)
1149     current_dir_block = mmap (0, metadata.count,
1150                               PROT_READ, MAP_SHARED, fd, pos);
1151     if (current_dir_block == MAP_FAILED)
1152         return FcFalse;
1153 #elif defined(_WIN32)
1154         {
1155                 HANDLE hFileMap;
1156
1157                 hFileMap = CreateFileMapping((HANDLE) _get_osfhandle(fd), NULL, PAGE_READONLY, 0, 0, NULL);
1158                 if (hFileMap == NULL)
1159                         return FcFalse;
1160
1161                 current_dir_block = MapViewOfFile (hFileMap, FILE_MAP_READ, 0, 0, metadata.count + pos);
1162                 if (current_dir_block == NULL)
1163                 {
1164                         CloseHandle (hFileMap);
1165                         return FcFalse;
1166                 }
1167
1168                 current_dir_block = (void *)((char *)current_dir_block + pos);
1169         }
1170 #else
1171     current_dir_block = malloc (metadata.count);
1172     if (!current_dir_block)
1173         return FcFalse;
1174
1175     /* could also use CreateMappedViewOfFile under MinGW... */
1176     if (read (fd, current_dir_block, metadata.count) != metadata.count)
1177         goto bail;
1178 #endif
1179     lseek (fd, pos+metadata.count, SEEK_SET);
1180
1181     FcCacheAddBankDir (metadata.bank, dir);
1182     if (config)
1183         FcConfigAddFontDir (config, (FcChar8 *)dir);
1184
1185     if (!FcFontSetUnserialize (&metadata, set, current_dir_block))
1186         goto bail;
1187
1188     return FcTrue;
1189  bail:
1190 #if !(defined(HAVE_MMAP) || defined(__CYGWIN__))
1191     free (current_dir_block);
1192 #endif
1193     return FcFalse;
1194 }
1195
1196 static void *
1197 FcDirCacheProduce (FcFontSet *set, FcCache *metadata)
1198 {
1199     void * current_dir_block, * final_dir_block;
1200     static unsigned int rand_state = 0;
1201     int bank, needed_bytes_no_align;
1202
1203 #if defined (HAVE_RAND_R)
1204     if (!rand_state)
1205         rand_state = time(0L);
1206     bank = rand_r(&rand_state);
1207
1208     while (FcCacheHaveBank(bank))
1209         bank = rand_r(&rand_state);
1210 #else
1211     if (!rand_state)
1212     {
1213         rand_state = 1;
1214         srand (time (0L));
1215     }
1216     bank = rand();
1217
1218     while (FcCacheHaveBank(bank))
1219         bank = rand();
1220 #endif
1221
1222     memset (metadata, 0, sizeof(FcCache));
1223     FcFontSetNewBank();
1224     needed_bytes_no_align = FcFontSetNeededBytes (set);
1225     metadata->count = needed_bytes_no_align +
1226         FcFontSetNeededBytesAlign ();
1227     metadata->magic = FC_CACHE_MAGIC;
1228     metadata->bank = bank;
1229
1230     if (!needed_bytes_no_align) /* not a failure, no fonts to write */
1231     {
1232         /* no, you don't really need to write any bytes at all. */
1233         metadata->count = 0;
1234         return 0;
1235     }
1236
1237     current_dir_block = malloc (metadata->count);
1238     if (!current_dir_block)
1239         goto bail;
1240     /* shut up valgrind */
1241     memset (current_dir_block, 0, metadata->count);
1242     final_dir_block = FcFontSetDistributeBytes (metadata, current_dir_block);
1243
1244     if ((void *)((char *)current_dir_block+metadata->count) < final_dir_block)
1245         goto bail;
1246
1247     if (!FcFontSetSerialize (bank, set))
1248         goto bail;
1249
1250     return current_dir_block;
1251
1252  bail:
1253     free (current_dir_block);
1254     return 0;
1255 }
1256
1257 static FcBool
1258 FcMakeDirectory (const FcChar8 *dir)
1259 {
1260     FcChar8 *parent;
1261     FcBool  ret;
1262
1263     if (strlen ((char *) dir) == 0)
1264         return FcFalse;
1265
1266     parent = FcStrDirname (dir);
1267     if (!parent)
1268         return FcFalse;
1269     if (access ((char *) parent, W_OK|X_OK) == 0)
1270         ret = mkdir ((char *) dir, 0777) == 0;
1271     else if (access ((char *) parent, F_OK) == -1)
1272         ret = FcMakeDirectory (parent) && (mkdir ((char *) dir, 0777) == 0);
1273     else
1274         ret = FcFalse;
1275     FcStrFree (parent);
1276     return ret;
1277 }
1278
1279 /* write serialized state to the cache file */
1280 FcBool
1281 FcDirCacheWrite (FcFontSet *set, FcStrSet *dirs, const FcChar8 *dir, FcConfig *config)
1282 {
1283     FcChar8         cache_base[CACHEBASE_LEN];
1284     FcChar8         *cache_hashed;
1285     int             fd, fd_orig, i, dirs_count;
1286     FcAtomic        *atomic;
1287     FcCache         metadata;
1288     off_t           current_arch_start = 0, truncate_to;
1289     FcStrList       *list;
1290     char            *current_arch_machine_name, * header;
1291     void            *current_dir_block = 0;
1292     FcChar8         *cache_dir = NULL;
1293     FcChar8         *test_dir;
1294
1295     dir = FcConfigNormalizeFontDir (FcConfigGetCurrent(), dir);
1296     if (!dir)
1297         return FcFalse;
1298
1299     /*
1300      * Write it to the first directory in the list which is writable
1301      */
1302
1303     list = FcStrListCreate (config->cacheDirs);
1304     if (!list)
1305         return FcFalse;
1306     while ((test_dir = FcStrListNext (list))) {
1307         if (access ((char *) test_dir, W_OK|X_OK) == 0)
1308         {
1309             cache_dir = test_dir;
1310             break;
1311         }
1312         else
1313         {
1314             /*
1315              * If the directory doesn't exist, try to create it
1316              */
1317             if (access ((char *) test_dir, F_OK) == -1) {
1318                 if (FcMakeDirectory (test_dir))
1319                 {
1320                     cache_dir = test_dir;
1321                     break;
1322                 }
1323             }
1324         }
1325     }
1326     FcStrListDone (list);
1327     if (!cache_dir)
1328         return FcFalse;
1329     FcDirCacheBasename (dir, cache_base);
1330     cache_hashed = FcStrPlus (cache_dir, cache_base);
1331     if (!cache_hashed)
1332         return FcFalse;
1333
1334     current_dir_block = FcDirCacheProduce (set, &metadata);
1335
1336     if (metadata.count && !current_dir_block)
1337         goto bail1;
1338
1339     if (FcDebug () & FC_DBG_CACHE)
1340         printf ("FcDirCacheWriteDir dir \"%s\" file \"%s\"\n",
1341                 dir, cache_hashed);
1342
1343     atomic = FcAtomicCreate ((FcChar8 *)cache_hashed);
1344     if (!atomic)
1345         goto bail1;
1346
1347     if (!FcAtomicLock (atomic))
1348         goto bail2;
1349
1350     /* open the original file to save relevant portions */
1351     fd_orig = open((char *)FcAtomicOrigFile (atomic), O_RDONLY | O_BINARY);
1352
1353     fd = open((char *)FcAtomicNewFile (atomic), O_RDWR | O_CREAT | O_BINARY, 0666);
1354     if (fd == -1)
1355         goto bail3;
1356
1357     FcCacheWriteString (fd, (char *) dir);
1358
1359     current_arch_machine_name = FcCacheMachineSignature ();
1360     current_arch_start = 0;
1361
1362     if (fd_orig != -1)
1363         current_arch_start =
1364             FcCacheSkipToArch(fd_orig, current_arch_machine_name);
1365
1366     if (current_arch_start < 0)
1367     {
1368         off_t offset = lseek(fd_orig, 0, SEEK_END);
1369         current_arch_start = FcCacheNextOffset (offset);
1370     }
1371
1372     if (fd_orig != -1 && !FcCacheCopyOld(fd, fd_orig, current_arch_start))
1373         goto bail4;
1374
1375     if (fd_orig != -1)
1376         close (fd_orig);
1377
1378     current_arch_start = lseek(fd, 0, SEEK_CUR);
1379 #if defined (HAVE_FTRUNCATE)
1380     if (ftruncate (fd, current_arch_start) == -1)
1381         goto bail4;
1382 #else
1383 #if defined (HAVE_CHSIZE)
1384     if (chsize (fd, current_arch_start) == -1)
1385         goto bail4;
1386 #else
1387     goto bail4;
1388 #endif
1389 #endif
1390
1391     /* allocate space for subdir names in this block */
1392     dirs_count = 0;
1393     for (i = 0; i < dirs->size; i++)
1394         dirs_count += strlen((char *)dirs->strs[i]) + 1;
1395     dirs_count ++;
1396
1397     /* now write the address of the next offset */
1398     truncate_to = FcCacheNextOffset (FcCacheNextOffset (current_arch_start + sizeof (FcCache) + dirs_count) + metadata.count) - current_arch_start;
1399     header = malloc (10 + strlen (current_arch_machine_name));
1400     if (!header)
1401         goto bail4;
1402     sprintf (header, "%8x ", (int)truncate_to);
1403     strcat (header, current_arch_machine_name);
1404     if (!FcCacheWriteString (fd, header))
1405         goto bail5;
1406
1407     for (i = 0; i < dirs->size; i++)
1408         FcCacheWriteString (fd, (char *)dirs->strs[i]);
1409     FcCacheWriteString (fd, "");
1410
1411     if (write (fd, &metadata, sizeof(FcCache)) != sizeof(FcCache))
1412     {
1413         perror("write metadata");
1414         goto bail5;
1415     }
1416     if (metadata.count)
1417     {
1418         off_t off = FcCacheNextOffset (lseek(fd, 0, SEEK_END));
1419         if (lseek (fd, off, SEEK_SET) != off)
1420             perror("lseek");
1421         else if (write (fd, current_dir_block, metadata.count) !=
1422                  metadata.count)
1423             perror("write current_dir_block");
1424         free (current_dir_block);
1425         current_dir_block = 0;
1426     }
1427
1428     /* this actually serves to pad out the cache file, if needed */
1429 #if defined (HAVE_FTRUNCATE)
1430     if (ftruncate (fd, current_arch_start + truncate_to) == -1)
1431         goto bail5;
1432 #else
1433 #if defined (HAVE_CHSIZE)
1434     if (chsize (fd, current_arch_start + truncate_to) == -1)
1435         goto bail5;
1436 #else
1437     goto bail5;
1438 #endif
1439 #endif
1440
1441     free (header);
1442     close(fd);
1443     if (!FcAtomicReplaceOrig(atomic))
1444         goto bail3;
1445     FcStrFree ((FcChar8 *)cache_hashed);
1446     FcAtomicUnlock (atomic);
1447     FcAtomicDestroy (atomic);
1448     return FcTrue;
1449
1450  bail5:
1451     free (header);
1452  bail4:
1453     close (fd);
1454  bail3:
1455     FcAtomicUnlock (atomic);
1456  bail2:
1457     FcAtomicDestroy (atomic);
1458  bail1:
1459     FcStrFree ((FcChar8 *)cache_hashed);
1460     if (current_dir_block)
1461         free (current_dir_block);
1462     return FcFalse;
1463 }
1464
1465 static char *
1466 FcCacheMachineSignature ()
1467 {
1468     static char buf[MACHINE_SIGNATURE_SIZE];
1469     int32_t magic = ENDIAN_TEST;
1470     char * m = (char *)&magic;
1471
1472     sprintf (buf, "%2x%2x%2x%2x "
1473              "%4x %4x %4x %4x %4x %4x %4x %4x %4x %4x %4x %4x "
1474              "%4x %4x %4x %4x %4x %4x %4x %4x\n",
1475              m[0], m[1], m[2], m[3],
1476              (unsigned int)sizeof (char),
1477              (unsigned int)sizeof (char *),
1478              (unsigned int)sizeof (int),
1479              (unsigned int)sizeof (FcPattern),
1480              (unsigned int)sizeof (FcPatternEltPtr),
1481              (unsigned int)sizeof (struct _FcPatternElt *),
1482              (unsigned int)sizeof (FcPatternElt),
1483              (unsigned int)sizeof (FcObjectPtr),
1484              (unsigned int)sizeof (FcValueListPtr),
1485              (unsigned int)sizeof (FcValue),
1486              (unsigned int)sizeof (FcValueBinding),
1487              (unsigned int)sizeof (struct _FcValueList *),
1488              (unsigned int)sizeof (FcCharSet),
1489              (unsigned int)sizeof (FcCharLeaf **),
1490              (unsigned int)sizeof (FcChar16 *),
1491              (unsigned int)sizeof (FcChar16),
1492              (unsigned int)sizeof (FcCharLeaf),
1493              (unsigned int)sizeof (FcChar32),
1494              (unsigned int)sizeof (FcCache),
1495 #if defined (HAVE_SYSCONF)
1496              (unsigned int)sysconf(_SC_PAGESIZE));
1497 #else
1498              (unsigned int)FC_HARDCODED_PAGESIZE);
1499 #endif
1500
1501     return buf;
1502 }
1503
1504 static int banks_ptr = 0, banks_alloc = 0;
1505 int * _fcBankId = 0, * _fcBankIdx = 0;
1506 static const char ** bankDirs = 0;
1507
1508 static FcBool
1509 FcCacheHaveBank (int bank)
1510 {
1511     int i;
1512
1513     if (bank < FC_BANK_FIRST)
1514         return FcTrue;
1515
1516     for (i = 0; i < banks_ptr; i++)
1517         if (_fcBankId[i] == bank)
1518             return FcTrue;
1519
1520     return FcFalse;
1521 }
1522
1523 int
1524 FcCacheBankToIndexMTF (int bank)
1525 {
1526     int i, j;
1527
1528     for (i = 0; i < banks_ptr; i++)
1529         if (_fcBankId[_fcBankIdx[i]] == bank)
1530         {
1531             int t = _fcBankIdx[i];
1532
1533             for (j = i; j > 0; j--)
1534                 _fcBankIdx[j] = _fcBankIdx[j-1];
1535             _fcBankIdx[0] = t;
1536             return t;
1537         }
1538
1539     if (banks_ptr >= banks_alloc)
1540     {
1541         int * b, * bidx;
1542         const char ** bds;
1543
1544         b = realloc (_fcBankId, (banks_alloc + 4) * sizeof(int));
1545         if (!b)
1546             return -1;
1547         _fcBankId = b;
1548
1549         bidx = realloc (_fcBankIdx, (banks_alloc + 4) * sizeof(int));
1550         if (!bidx)
1551             return -1;
1552         _fcBankIdx = bidx;
1553
1554         bds = realloc (bankDirs, (banks_alloc + 4) * sizeof (char *));
1555         if (!bds)
1556             return -1;
1557         bankDirs = bds;
1558
1559         banks_alloc += 4;
1560     }
1561
1562     i = banks_ptr++;
1563     _fcBankId[i] = bank;
1564     _fcBankIdx[i] = i;
1565     return i;
1566 }
1567
1568 static void
1569 FcCacheAddBankDir (int bank, const char * dir)
1570 {
1571     int bi = FcCacheBankToIndexMTF (bank);
1572
1573     if (bi < 0)
1574         return;
1575
1576     bankDirs[bi] = (const char *)FcStrCopy ((FcChar8 *)dir);
1577 }
1578
1579 const char *
1580 FcCacheFindBankDir (int bank)
1581 {
1582     int bi = FcCacheBankToIndex (bank);
1583     return bankDirs[bi];
1584 }
1585
1586 /*
1587  * This code implements the MD5 message-digest algorithm.
1588  * The algorithm is due to Ron Rivest.  This code was
1589  * written by Colin Plumb in 1993, no copyright is claimed.
1590  * This code is in the public domain; do with it what you wish.
1591  *
1592  * Equivalent code is available from RSA Data Security, Inc.
1593  * This code has been tested against that, and is equivalent,
1594  * except that you don't need to include two pages of legalese
1595  * with every copy.
1596  *
1597  * To compute the message digest of a chunk of bytes, declare an
1598  * MD5Context structure, pass it to MD5Init, call MD5Update as
1599  * needed on buffers full of bytes, and then call MD5Final, which
1600  * will fill a supplied 16-byte array with the digest.
1601  */
1602
1603 #ifndef HIGHFIRST
1604 #define byteReverse(buf, len)   /* Nothing */
1605 #else
1606 /*
1607  * Note: this code is harmless on little-endian machines.
1608  */
1609 void byteReverse(unsigned char *buf, unsigned longs)
1610 {
1611     FcChar32 t;
1612     do {
1613         t = (FcChar32) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
1614             ((unsigned) buf[1] << 8 | buf[0]);
1615         *(FcChar32 *) buf = t;
1616         buf += 4;
1617     } while (--longs);
1618 }
1619 #endif
1620
1621 /*
1622  * Start MD5 accumulation.  Set bit count to 0 and buffer to mysterious
1623  * initialization constants.
1624  */
1625 static void MD5Init(struct MD5Context *ctx)
1626 {
1627     ctx->buf[0] = 0x67452301;
1628     ctx->buf[1] = 0xefcdab89;
1629     ctx->buf[2] = 0x98badcfe;
1630     ctx->buf[3] = 0x10325476;
1631
1632     ctx->bits[0] = 0;
1633     ctx->bits[1] = 0;
1634 }
1635
1636 /*
1637  * Update context to reflect the concatenation of another buffer full
1638  * of bytes.
1639  */
1640 static void MD5Update(struct MD5Context *ctx, unsigned char *buf, unsigned len)
1641 {
1642     FcChar32 t;
1643
1644     /* Update bitcount */
1645
1646     t = ctx->bits[0];
1647     if ((ctx->bits[0] = t + ((FcChar32) len << 3)) < t)
1648         ctx->bits[1]++;         /* Carry from low to high */
1649     ctx->bits[1] += len >> 29;
1650
1651     t = (t >> 3) & 0x3f;        /* Bytes already in shsInfo->data */
1652
1653     /* Handle any leading odd-sized chunks */
1654
1655     if (t) {
1656         unsigned char *p = (unsigned char *) ctx->in + t;
1657
1658         t = 64 - t;
1659         if (len < t) {
1660             memcpy(p, buf, len);
1661             return;
1662         }
1663         memcpy(p, buf, t);
1664         byteReverse(ctx->in, 16);
1665         MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
1666         buf += t;
1667         len -= t;
1668     }
1669     /* Process data in 64-byte chunks */
1670
1671     while (len >= 64) {
1672         memcpy(ctx->in, buf, 64);
1673         byteReverse(ctx->in, 16);
1674         MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
1675         buf += 64;
1676         len -= 64;
1677     }
1678
1679     /* Handle any remaining bytes of data. */
1680
1681     memcpy(ctx->in, buf, len);
1682 }
1683
1684 /*
1685  * Final wrapup - pad to 64-byte boundary with the bit pattern
1686  * 1 0* (64-bit count of bits processed, MSB-first)
1687  */
1688 static void MD5Final(unsigned char digest[16], struct MD5Context *ctx)
1689 {
1690     unsigned count;
1691     unsigned char *p;
1692
1693     /* Compute number of bytes mod 64 */
1694     count = (ctx->bits[0] >> 3) & 0x3F;
1695
1696     /* Set the first char of padding to 0x80.  This is safe since there is
1697        always at least one byte free */
1698     p = ctx->in + count;
1699     *p++ = 0x80;
1700
1701     /* Bytes of padding needed to make 64 bytes */
1702     count = 64 - 1 - count;
1703
1704     /* Pad out to 56 mod 64 */
1705     if (count < 8) {
1706         /* Two lots of padding:  Pad the first block to 64 bytes */
1707         memset(p, 0, count);
1708         byteReverse(ctx->in, 16);
1709         MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
1710
1711         /* Now fill the next block with 56 bytes */
1712         memset(ctx->in, 0, 56);
1713     } else {
1714         /* Pad block to 56 bytes */
1715         memset(p, 0, count - 8);
1716     }
1717     byteReverse(ctx->in, 14);
1718
1719     /* Append length in bits and transform */
1720     ((FcChar32 *) ctx->in)[14] = ctx->bits[0];
1721     ((FcChar32 *) ctx->in)[15] = ctx->bits[1];
1722
1723     MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
1724     byteReverse((unsigned char *) ctx->buf, 4);
1725     memcpy(digest, ctx->buf, 16);
1726     memset(ctx, 0, sizeof(ctx));        /* In case it's sensitive */
1727 }
1728
1729
1730 /* The four core functions - F1 is optimized somewhat */
1731
1732 /* #define F1(x, y, z) (x & y | ~x & z) */
1733 #define F1(x, y, z) (z ^ (x & (y ^ z)))
1734 #define F2(x, y, z) F1(z, x, y)
1735 #define F3(x, y, z) (x ^ y ^ z)
1736 #define F4(x, y, z) (y ^ (x | ~z))
1737
1738 /* This is the central step in the MD5 algorithm. */
1739 #define MD5STEP(f, w, x, y, z, data, s) \
1740         ( w += f(x, y, z) + data,  w = w<<s | w>>(32-s),  w += x )
1741
1742 /*
1743  * The core of the MD5 algorithm, this alters an existing MD5 hash to
1744  * reflect the addition of 16 longwords of new data.  MD5Update blocks
1745  * the data and converts bytes into longwords for this routine.
1746  */
1747 static void MD5Transform(FcChar32 buf[4], FcChar32 in[16])
1748 {
1749     register FcChar32 a, b, c, d;
1750
1751     a = buf[0];
1752     b = buf[1];
1753     c = buf[2];
1754     d = buf[3];
1755
1756     MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
1757     MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
1758     MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
1759     MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
1760     MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
1761     MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
1762     MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
1763     MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
1764     MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
1765     MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
1766     MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
1767     MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
1768     MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
1769     MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
1770     MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
1771     MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
1772
1773     MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
1774     MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
1775     MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
1776     MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
1777     MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
1778     MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
1779     MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
1780     MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
1781     MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
1782     MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
1783     MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
1784     MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
1785     MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
1786     MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
1787     MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
1788     MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
1789
1790     MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
1791     MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
1792     MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
1793     MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
1794     MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
1795     MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
1796     MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
1797     MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
1798     MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
1799     MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
1800     MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
1801     MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
1802     MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
1803     MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
1804     MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
1805     MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
1806
1807     MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
1808     MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
1809     MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
1810     MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
1811     MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
1812     MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
1813     MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
1814     MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
1815     MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
1816     MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
1817     MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
1818     MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
1819     MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
1820     MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
1821     MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
1822     MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
1823
1824     buf[0] += a;
1825     buf[1] += b;
1826     buf[2] += c;
1827     buf[3] += d;
1828 }