src/fccache.c

   1 /*
   2  * $RCSId: xc/lib/fontconfig/src/fccache.c,v 1.12 2002/08/22 07:36:44 keithp Exp $
   3  *
   4  * Copyright © 2000 Keith Packard
   5  * Copyright © 2005 Patrick Lam
   6  *
   7  * Permission to use, copy, modify, distribute, and sell this software and its
   8  * documentation for any purpose is hereby granted without fee, provided that
   9  * the above copyright notice appear in all copies and that both that
  10  * copyright notice and this permission notice appear in supporting
  11  * documentation, and that the name of Keith Packard not be used in
  12  * advertising or publicity pertaining to distribution of the software without
  13  * specific, written prior permission.  Keith Packard makes no
  14  * representations about the suitability of this software for any purpose.  It
  15  * is provided "as is" without express or implied warranty.
  16  *
  17  * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  18  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  19  * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  20  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  21  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  22  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  23  * PERFORMANCE OF THIS SOFTWARE.
  24  */
  25
  26 #include <fcntl.h>
  27 #include <dirent.h>
  28 #include <string.h>
  29 #include <sys/mman.h>
  30 #include <sys/utsname.h>
  31 #include <sys/types.h>
  32 #include <unistd.h>
  33 #include "fcint.h"
  34 #include <unistd.h>
  35
  36 #define ENDIAN_TEST 0x12345678
  37 #define MACHINE_SIGNATURE_SIZE (9 + 5*20 + 1)
  38
  39 #ifndef O_BINARY
  40 #define O_BINARY 0
  41 #endif
  42
  43 static int
  44 FcDirCacheOpen (const FcChar8 * dir);
  45
  46 static char *
  47 FcDirCacheHashName (char * cache_file, int collisions);
  48
  49 static off_t
  50 FcCacheSkipToArch (int fd, const char * arch);
  51
  52 static FcBool
  53 FcCacheCopyOld (int fd, int fd_orig, off_t start);
  54
  55 static void *
  56 FcDirCacheProduce (FcFontSet *set, FcCache * metadata);
  57
  58 static FcBool
  59 FcDirCacheConsume (int fd, const char * dir, FcFontSet *set, FcConfig *config);
  60
  61 static int
  62 FcCacheNextOffset(off_t w);
  63
  64 static char *
  65 FcCacheMachineSignature (void);
  66
  67 static FcBool
  68 FcCacheHaveBank (int bank);
  69
  70 static void
  71 FcCacheAddBankDir (int bank, const char * dir);
  72
  73 struct MD5Context {
  74         FcChar32 buf[4];
  75         FcChar32 bits[2];
  76         unsigned char in[64];
  77 };
  78
  79 static void MD5Init(struct MD5Context *ctx);
  80 static void MD5Update(struct MD5Context *ctx, unsigned char *buf, unsigned len);
  81 static void MD5Final(unsigned char digest[16], struct MD5Context *ctx);
  82 static void MD5Transform(FcChar32 buf[4], FcChar32 in[16]);
  83
  84 #define FC_DBG_CACHE_REF    1024
  85
  86 static char *
  87 FcCacheReadString (int fd, char *dest, int len)
  88 {
  89     int    size;
  90     int    slen;
  91
  92     if (len == 0)
  93         return 0;
  94
  95     size = read (fd, dest, len-1);
  96
  97     if (size > 0)
  98     {
  99         dest[size] = '\0';
 100         slen = strlen (dest);
 101
 102         lseek (fd, slen - size + 1, SEEK_CUR);
 103         return slen < len ? dest : 0;
 104     }
 105
 106     return 0;
 107 }
 108
 109 static void
 110 FcCacheSkipString (int fd)
 111 {
 112     char buf[256];
 113     int  size;
 114     int  slen;
 115
 116     while ( (size = read (fd, buf, sizeof (buf)-1)) > 0)
 117     {
 118         buf [size] = '\0';
 119         slen = strlen (buf);
 120         if (slen < size)
 121         {
 122             lseek (fd, slen - size + 1, SEEK_CUR);
 123             return;
 124         }
 125     }
 126 }
 127
 128 static FcBool
 129 FcCacheWriteString (int fd, const char *chars)
 130 {
 131     if (write (fd, chars, strlen(chars)+1) != strlen(chars)+1)
 132         return FcFalse;
 133     return FcTrue;
 134 }
 135
 136 static void
 137 FcGlobalCacheDirDestroy (FcGlobalCacheDir *d)
 138 {
 139     FcStrSetDestroy (d->subdirs);
 140     FcMemFree (FC_MEM_STRING, strlen (d->name)+1);
 141     free (d->name);
 142     FcMemFree (FC_MEM_CACHE, sizeof (FcGlobalCacheDir));
 143     free (d);
 144 }
 145
 146 FcGlobalCache *
 147 FcGlobalCacheCreate (void)
 148 {
 149     FcGlobalCache   *cache;
 150
 151     cache = malloc (sizeof (FcGlobalCache));
 152     if (!cache)
 153         return 0;
 154     FcMemAlloc (FC_MEM_CACHE, sizeof (FcGlobalCache));
 155     cache->dirs = 0;
 156     cache->updated = FcFalse;
 157     cache->fd = -1;
 158     return cache;
 159 }
 160
 161 void
 162 FcGlobalCacheDestroy (FcGlobalCache *cache)
 163 {
 164     FcGlobalCacheDir    *d, *next;
 165
 166     for (d = cache->dirs; d; d = next)
 167     {
 168         next = d->next;
 169         FcGlobalCacheDirDestroy (d);
 170     }
 171     FcMemFree (FC_MEM_CACHE, sizeof (FcGlobalCache));
 172     free (cache);
 173 }
 174
 175 void
 176 FcGlobalCacheLoad (FcGlobalCache    *cache,
 177                    FcStrSet         *staleDirs,
 178                    const FcChar8    *cache_file,
 179                    FcConfig         *config)
 180 {
 181     char                name_buf[FC_MAX_FILE_LEN];
 182     FcGlobalCacheDir    *d, *next;
 183     FcFileTime          config_time = FcConfigModifiedTime (config);
 184     char                * current_arch_machine_name;
 185     char                candidate_arch_machine_name[MACHINE_SIGNATURE_SIZE + 9];
 186     off_t               current_arch_start;
 187
 188     struct stat         cache_stat, dir_stat;
 189     char                subdirName[FC_MAX_FILE_LEN + 1 + 12 + 1];
 190
 191     if (stat ((char *) cache_file, &cache_stat) < 0)
 192         return;
 193
 194     cache->fd = open ((char *) cache_file, O_RDONLY | O_BINARY);
 195     if (cache->fd == -1)
 196         return;
 197
 198     cache->updated = FcFalse;
 199
 200     if (!FcCacheReadString (cache->fd, name_buf, sizeof (name_buf)))
 201         goto bail_and_destroy;
 202     if (strcmp (name_buf, FC_GLOBAL_MAGIC_COOKIE) != 0)
 203         goto bail_and_destroy;
 204
 205     current_arch_machine_name = FcCacheMachineSignature ();
 206     current_arch_start = FcCacheSkipToArch(cache->fd,
 207                                            current_arch_machine_name);
 208     if (current_arch_start < 0)
 209         goto bail1;
 210
 211     lseek (cache->fd, current_arch_start, SEEK_SET);
 212     if (!FcCacheReadString (cache->fd, candidate_arch_machine_name,
 213                             sizeof (candidate_arch_machine_name)))
 214         goto bail_and_destroy;
 215     if (strlen(candidate_arch_machine_name) == 0)
 216         goto bail_and_destroy;
 217
 218     while (1)
 219     {
 220         off_t targ;
 221
 222         if (!FcCacheReadString (cache->fd, name_buf, sizeof (name_buf)) ||
 223             !strlen(name_buf))
 224             break;
 225
 226         /* Directory must be older than the global cache file; also
 227            cache must be newer than the config file. */
 228         if (stat ((char *) name_buf, &dir_stat) < 0 ||
 229             dir_stat.st_mtime > cache_stat.st_mtime ||
 230             (config_time.set && cache_stat.st_mtime < config_time.time))
 231         {
 232             FcCache md;
 233             off_t off;
 234
 235             FcStrSetAdd (staleDirs, FcStrCopy ((FcChar8 *)name_buf));
 236
 237             /* skip subdirs */
 238             while (FcCacheReadString (cache->fd, subdirName,
 239                                       sizeof (subdirName)) &&
 240                    strlen (subdirName))
 241                 ;
 242
 243             if (read (cache->fd, &md, sizeof (FcCache)) != sizeof(FcCache))
 244             {
 245                 perror ("read metadata");
 246                 goto bail1;
 247             }
 248             off = FcCacheNextOffset (lseek(cache->fd, 0, SEEK_CUR)) + md.count;
 249             if (lseek (cache->fd, off, SEEK_SET) != off)
 250             {
 251                 perror ("lseek");
 252                 goto bail1;
 253             }
 254             continue;
 255         }
 256
 257         d = malloc (sizeof (FcGlobalCacheDir));
 258         if (!d)
 259             goto bail1;
 260
 261         d->next = cache->dirs;
 262         cache->dirs = d;
 263
 264         d->name = (char *)FcStrCopy ((FcChar8 *)name_buf);
 265         d->ent = 0;
 266         d->state = FcGCDirFileRead;
 267
 268         d->subdirs = FcStrSetCreate();
 269         do
 270         {
 271             if (!FcCacheReadString (cache->fd, subdirName,
 272                                     sizeof (subdirName)) ||
 273                 !strlen (subdirName))
 274                 break;
 275             FcStrSetAdd (d->subdirs, (FcChar8 *)subdirName);
 276         } while (1);
 277
 278         d->offset = lseek (cache->fd, 0, SEEK_CUR);
 279         if (read (cache->fd, &d->metadata, sizeof (FcCache)) != sizeof (FcCache))
 280             goto bail1;
 281         targ = FcCacheNextOffset (lseek(cache->fd, 0, SEEK_CUR)) + d->metadata.count;
 282         if (lseek (cache->fd, targ, SEEK_SET) != targ)
 283             goto bail1;
 284     }
 285     return;
 286
 287  bail1:
 288     for (d = cache->dirs; d; d = next)
 289     {
 290         next = d->next;
 291         free (d);
 292     }
 293     cache->dirs = 0;
 294
 295     close (cache->fd);
 296     cache->fd = -1;
 297     return;
 298
 299  bail_and_destroy:
 300     close (cache->fd);
 301     cache->fd = -1;
 302
 303     if (stat ((char *) cache_file, &cache_stat) == 0)
 304         unlink ((char *)cache_file);
 305
 306     return;
 307
 308 }
 309
 310 FcBool
 311 FcGlobalCacheReadDir (FcFontSet *set, FcStrSet *dirs, FcGlobalCache * cache, const char *dir, FcConfig *config)
 312 {
 313     FcGlobalCacheDir    *d;
 314     int                 i;
 315
 316     if (cache->fd == -1)
 317         return FcFalse;
 318
 319     if (!(dir = (char *)FcConfigNormalizeFontDir (config, (FcChar8 *)dir)))
 320         return FcFalse; /* non-existing directory */
 321
 322     for (d = cache->dirs; d; d = d->next)
 323     {
 324         if (strcmp (d->name, dir) == 0)
 325         {
 326             if (d->state == FcGCDirDisabled)
 327                 return FcFalse;
 328
 329             if (d->state == FcGCDirFileRead)
 330             {
 331                 lseek (cache->fd, d->offset, SEEK_SET);
 332                 if (!FcDirCacheConsume (cache->fd, d->name, set, config))
 333                     return FcFalse;
 334
 335                 for (i = 0; i < d->subdirs->num; i++)
 336                     FcStrSetAdd (dirs, (FcChar8 *)d->subdirs->strs[i]);
 337
 338                 d->state = FcGCDirConsumed;
 339             }
 340             return FcTrue;
 341         }
 342     }
 343
 344     return FcFalse;
 345 }
 346
 347 static FcGlobalCacheDir *
 348 FcGlobalCacheDirFind (FcGlobalCache *cache, const char *name)
 349 {
 350     FcGlobalCacheDir * d;
 351
 352     if (!cache || !name)
 353         return NULL;
 354
 355     for (d = cache->dirs; d; d = d->next)
 356         if (strcmp((const char *)d->name, (const char *)name) == 0)
 357             return d;
 358
 359     return NULL;
 360  }
 361
 362 FcBool
 363 FcGlobalCacheUpdate (FcGlobalCache  *cache,
 364                      FcStrSet       *dirs,
 365                      const char     *orig_name,
 366                      FcFontSet      *set,
 367                      FcConfig       *config)
 368 {
 369     FcGlobalCacheDir    *d;
 370     int                 i;
 371     const char *name;
 372
 373     name = (char *)FcConfigNormalizeFontDir (config, (FcChar8 *)orig_name);
 374     if (!name)
 375     {
 376         fprintf(stderr, "Invalid directory name %s\n", orig_name);
 377         return FcFalse;
 378     }
 379
 380     d = FcGlobalCacheDirFind (cache, name);
 381
 382     if (!d)
 383     {
 384         d = malloc (sizeof (FcGlobalCacheDir));
 385         if (!d)
 386             return FcFalse;
 387         d->next = cache->dirs;
 388         cache->dirs = d;
 389     } else {
 390         /* free old resources */
 391         FcStrFree ((FcChar8 *)d->name);
 392         free (d->ent);
 393         FcStrSetDestroy (d->subdirs);
 394     }
 395
 396     cache->updated = FcTrue;
 397
 398     d->name = (char *)FcStrCopy ((FcChar8 *)name);
 399     d->ent = FcDirCacheProduce (set, &d->metadata);
 400     d->offset = 0;
 401     d->subdirs = FcStrSetCreate();
 402     d->state = FcGCDirUpdated;
 403     for (i = 0; i < dirs->num; i++)
 404         FcStrSetAdd (d->subdirs, dirs->strs[i]);
 405     return FcTrue;
 406 }
 407
 408 FcBool
 409 FcGlobalCacheSave (FcGlobalCache    *cache,
 410                    const FcChar8    *cache_file,
 411                    FcConfig         *config)
 412 {
 413     int                 fd, fd_orig;
 414     FcGlobalCacheDir    *dir;
 415     FcAtomic            *atomic;
 416     off_t               current_arch_start = 0, truncate_to;
 417     char                * current_arch_machine_name, * header;
 418
 419     if (!cache->updated)
 420         return FcTrue;
 421
 422 #if defined (HAVE_GETUID) && defined (HAVE_GETEUID)
 423     /* Set-UID programs can't safely update the cache */
 424     if (getuid () != geteuid ())
 425         return FcFalse;
 426 #endif
 427
 428     atomic = FcAtomicCreate (cache_file);
 429     if (!atomic)
 430         return FcFalse;
 431
 432     if (!FcAtomicLock (atomic))
 433         goto bail1;
 434     fd = open ((char *) FcAtomicNewFile(atomic), O_RDWR | O_CREAT | O_BINARY,
 435                S_IRUSR | S_IWUSR);
 436     if (fd == -1)
 437         goto bail2;
 438     FcCacheWriteString (fd, FC_GLOBAL_MAGIC_COOKIE);
 439
 440     fd_orig = open ((char *) FcAtomicOrigFile(atomic), O_RDONLY | O_BINARY);
 441
 442     current_arch_machine_name = FcCacheMachineSignature ();
 443     if (fd_orig == -1)
 444         current_arch_start = 0;
 445     else
 446         current_arch_start = FcCacheSkipToArch (fd_orig,
 447                                                 current_arch_machine_name);
 448
 449     if (current_arch_start < 0)
 450     {
 451         off_t i = lseek(fd_orig, 0, SEEK_END);
 452         if (i < strlen (FC_GLOBAL_MAGIC_COOKIE)+1)
 453             i = strlen (FC_GLOBAL_MAGIC_COOKIE)+1;
 454         current_arch_start = FcCacheNextOffset (i);
 455     }
 456
 457     if (!FcCacheCopyOld(fd, fd_orig, current_arch_start))
 458         goto bail3;
 459
 460     current_arch_start = lseek(fd, 0, SEEK_CUR);
 461     if (ftruncate (fd, current_arch_start) == -1)
 462         goto bail3;
 463
 464     header = malloc (10 + strlen (current_arch_machine_name));
 465     if (!header)
 466         goto bail3;
 467
 468     truncate_to = current_arch_start + strlen(current_arch_machine_name) + 11;
 469     for (dir = cache->dirs; dir; dir = dir->next)
 470     {
 471         int i;
 472
 473         if (dir->state == FcGCDirDisabled)
 474             continue;
 475         truncate_to += strlen(dir->name) + 1;
 476         truncate_to += sizeof (FcCache);
 477         truncate_to = FcCacheNextOffset (truncate_to);
 478         truncate_to += dir->metadata.count;
 479
 480         for (i = 0; i < dir->subdirs->size; i++)
 481             truncate_to += strlen((char *)dir->subdirs->strs[i]) + 1;
 482         truncate_to ++;
 483     }
 484     truncate_to -= current_arch_start;
 485
 486     sprintf (header, "%8x ", (int)truncate_to);
 487     strcat (header, current_arch_machine_name);
 488     if (!FcCacheWriteString (fd, header))
 489         goto bail4;
 490
 491     for (dir = cache->dirs; dir; dir = dir->next)
 492     {
 493         int i;
 494         const char * d;
 495         off_t off;
 496
 497         if (!dir->name || dir->state == FcGCDirDisabled)
 498             continue;
 499         d = (const char *)FcConfigNormalizeFontDir (config, (const FcChar8 *)dir->name);
 500         if (!d)
 501             continue;
 502
 503         if (dir->metadata.count && !dir->ent)
 504         {
 505             if (dir->state == FcGCDirUpdated || fd_orig < 0)
 506             {
 507                 fprintf(stderr, "Invalid metadata entry for %s, skipping...\n", d);
 508                 continue;
 509             }
 510             /* copy the old content */
 511             dir->ent = malloc (dir->metadata.count);
 512             if (!dir->ent)
 513             {
 514                 perror("malloc error");
 515                 continue;
 516             }
 517             off = FcCacheNextOffset (dir->offset + sizeof(FcCache));
 518             if (lseek (fd_orig, off, SEEK_SET) != off)
 519             {
 520                 perror("lseek");
 521                 free(dir->ent);
 522                 continue;
 523             }
 524             if (read (fd_orig, dir->ent, dir->metadata.count)
 525                 != dir->metadata.count)
 526             {
 527                 perror("read");
 528                 free(dir->ent);
 529                 continue;
 530             }
 531         }
 532
 533         FcCacheWriteString (fd, d);
 534
 535         for (i = 0; i < dir->subdirs->size; i++)
 536             FcCacheWriteString (fd, (char *)dir->subdirs->strs[i]);
 537         FcCacheWriteString (fd, "");
 538
 539         if (write (fd, &dir->metadata, sizeof(FcCache)) != sizeof(FcCache))
 540         {
 541             perror ("write metadata");
 542             free (dir->ent);
 543             continue;
 544         }
 545         off = FcCacheNextOffset (lseek(fd, 0, SEEK_CUR));
 546         if (lseek (fd, off, SEEK_SET) != off)
 547         {
 548             perror ("lseek");
 549             free (dir->ent);
 550             continue;
 551         }
 552         if (dir->metadata.count)
 553         {
 554             if (write (fd, dir->ent, dir->metadata.count) != dir->metadata.count)
 555             {
 556                 perror ("write dirent");
 557                 free (dir->ent);
 558                 continue;
 559             }
 560         }
 561         free (dir->ent);
 562     }
 563     FcCacheWriteString (fd, "");
 564
 565     if (close (fd) == -1)
 566         goto bail25;
 567
 568     close (fd_orig);
 569     fd_orig = -1;
 570
 571     if (!FcAtomicReplaceOrig (atomic))
 572         goto bail25;
 573
 574     FcAtomicUnlock (atomic);
 575     FcAtomicDestroy (atomic);
 576
 577     cache->updated = FcFalse;
 578     return FcTrue;
 579
 580  bail4:
 581     free (header);
 582  bail3:
 583     if (fd_orig != -1)
 584         close (fd_orig);
 585
 586     close (fd);
 587  bail25:
 588     FcAtomicDeleteNew (atomic);
 589  bail2:
 590     FcAtomicUnlock (atomic);
 591  bail1:
 592     FcAtomicDestroy (atomic);
 593     return FcFalse;
 594 }
 595
 596 /*
 597  * Find the next presumably-mmapable offset after the supplied file
 598  * position.
 599  */
 600 static int
 601 FcCacheNextOffset(off_t w)
 602 {
 603     static long pagesize = -1;
 604     if (pagesize == -1)
 605         pagesize = sysconf(_SC_PAGESIZE);
 606     if (w % pagesize == 0)
 607         return w;
 608     else
 609         return ((w / pagesize)+1)*pagesize;
 610 }
 611
 612 /* return the address of the segment for the provided arch,
 613  * or -1 if arch not found */
 614 static off_t
 615 FcCacheSkipToArch (int fd, const char * arch)
 616 {
 617     char candidate_arch_machine_name_count[MACHINE_SIGNATURE_SIZE + 9];
 618     char * candidate_arch;
 619     off_t current_arch_start = 0;
 620
 621     lseek (fd, 0, SEEK_SET);
 622     FcCacheSkipString (fd);
 623     current_arch_start = lseek (fd, 0, SEEK_CUR);
 624
 625     /* skip arches that are not the current arch */
 626     while (1)
 627     {
 628         long bs;
 629
 630         if (lseek (fd, current_arch_start, SEEK_SET) != current_arch_start)
 631             return -1;
 632
 633         if (FcCacheReadString (fd, candidate_arch_machine_name_count,
 634                                 sizeof (candidate_arch_machine_name_count)) == 0)
 635             return -1;
 636         if (!strlen(candidate_arch_machine_name_count))
 637             return -1;
 638         bs = strtol(candidate_arch_machine_name_count, &candidate_arch, 16);
 639
 640         /* count = 0 should probably be distinguished from the !bs condition */
 641         if (!bs || bs < strlen (candidate_arch_machine_name_count))
 642             return -1;
 643
 644         candidate_arch++; /* skip leading space */
 645
 646         if (strcmp (candidate_arch, arch)==0)
 647             return current_arch_start;
 648         current_arch_start += bs;
 649         current_arch_start = FcCacheNextOffset (current_arch_start);
 650     }
 651 }
 652
 653 /* Cuts out the segment at the file pointer (moves everything else
 654  * down to cover it), and leaves the file pointer at the end of the
 655  * file. */
 656 static FcBool
 657 FcCacheCopyOld (int fd, int fd_orig, off_t start)
 658 {
 659     char * buf = malloc (8192);
 660     char candidate_arch_machine_name[MACHINE_SIGNATURE_SIZE + 9];
 661     long bs;
 662     int c, bytes_skipped;
 663     off_t loc;
 664
 665     if (!buf)
 666         return FcFalse;
 667
 668     loc = 0;
 669     lseek (fd, 0, SEEK_SET); lseek (fd_orig, 0, SEEK_SET);
 670     FcCacheSkipString (fd); FcCacheSkipString (fd_orig);
 671     do
 672     {
 673         int b = 8192;
 674         if (loc + b > start)
 675             b = start - loc;
 676
 677         if ((c = read (fd_orig, buf, b)) <= 0)
 678             break;
 679         if (write (fd, buf, c) < 0)
 680             goto bail;
 681
 682         loc += c;
 683     }
 684     while (c > 0);
 685
 686     lseek (fd, start, SEEK_SET);
 687     if (FcCacheReadString (fd, candidate_arch_machine_name,
 688                            sizeof (candidate_arch_machine_name)) == 0)
 689         goto done;
 690     if (!strlen(candidate_arch_machine_name))
 691         goto done;
 692
 693     bs = strtol(candidate_arch_machine_name, 0, 16);
 694     if (bs == 0)
 695         goto done;
 696
 697     bytes_skipped = 0;
 698     do
 699     {
 700         lseek (fd, start+bs+bytes_skipped, SEEK_SET);
 701         if ((c = read (fd, buf, 8192)) <= 0)
 702             break;
 703         lseek (fd, start+bytes_skipped, SEEK_SET);
 704         if (write (fd, buf, c) < 0)
 705             goto bail;
 706         bytes_skipped += c;
 707     }
 708     while (c > 0);
 709     lseek (fd, start+bytes_skipped, SEEK_SET);
 710
 711  done:
 712     free (buf);
 713     return FcTrue;
 714
 715  bail:
 716     free (buf);
 717     return FcFalse;
 718 }
 719
 720 /* Does not check that the cache has the appropriate arch section. */
 721 /* Also, this can be fooled if the original location has a stale
 722  * cache, and the hashed location has an up-to-date cache.  Oh well,
 723  * sucks to be you in that case! */
 724 FcBool
 725 FcDirCacheValid (const FcChar8 *dir)
 726 {
 727     struct stat file_stat, dir_stat;
 728     int         fd;
 729
 730     if (stat ((char *) dir, &dir_stat) < 0)
 731         return FcFalse;
 732
 733     fd = FcDirCacheOpen (dir);
 734
 735     if (fd < 0)
 736         return FcFalse;
 737     if (fstat (fd, &file_stat) < 0)
 738         goto bail;
 739
 740     close (fd);
 741
 742     /*
 743      * If the directory has been modified more recently than
 744      * the cache file, the cache is not valid
 745      */
 746     if (dir_stat.st_mtime > file_stat.st_mtime)
 747         return FcFalse;
 748
 749     return FcTrue;
 750
 751  bail:
 752     close (fd);
 753     return FcFalse;
 754 }
 755
 756 /* Assumes that the cache file in 'dir' exists.
 757  * Checks that the cache has the appropriate arch section. */
 758 FcBool
 759 FcDirCacheHasCurrentArch (const FcChar8 *dir)
 760 {
 761     int         fd;
 762     off_t       current_arch_start;
 763     char        *current_arch_machine_name;
 764     FcCache     metadata;
 765     char        subdirName[FC_MAX_FILE_LEN + 1 + 12 + 1];
 766
 767     fd = FcDirCacheOpen (dir);
 768     if (fd < 0)
 769         goto bail;
 770
 771     current_arch_machine_name = FcCacheMachineSignature();
 772     current_arch_start = FcCacheSkipToArch(fd, current_arch_machine_name);
 773
 774     if (current_arch_start >= 0)
 775     {
 776         if (lseek (fd, current_arch_start, SEEK_SET) != current_arch_start)
 777             goto bail1;
 778
 779         FcCacheSkipString (fd);
 780
 781         while (FcCacheReadString (fd, subdirName, sizeof (subdirName)) && strlen (subdirName) > 0)
 782             ;
 783
 784         if (read(fd, &metadata, sizeof(FcCache)) != sizeof(FcCache))
 785             goto bail1;
 786
 787         if (metadata.magic != FC_CACHE_MAGIC)
 788             goto bail1;
 789     }
 790
 791     close (fd);
 792
 793     if (current_arch_start < 0)
 794         return FcFalse;
 795
 796     return FcTrue;
 797
 798  bail1:
 799     close (fd);
 800  bail:
 801     return FcFalse;
 802 }
 803
 804 FcBool
 805 FcDirCacheUnlink (const FcChar8 *dir, FcConfig *config)
 806 {
 807     char        *cache_file;
 808     char        *cache_hashed = 0;
 809     int         fd, collisions;
 810     struct stat cache_stat;
 811     char        name_buf[FC_MAX_FILE_LEN];
 812
 813     dir = FcConfigNormalizeFontDir (config, dir);
 814     cache_file = (char *)FcStrPlus (dir, (FcChar8 *) "/" FC_DIR_CACHE_FILE);
 815     if (!cache_file)
 816         return FcFalse;
 817
 818     /* First remove normal cache file. */
 819     if (stat ((char *) cache_file, &cache_stat) == 0)
 820         unlink ((char *)cache_file);
 821
 822     /* Next remove any applicable hashed files. */
 823     fd = -1; collisions = 0;
 824     do
 825     {
 826         if (cache_hashed)
 827             FcStrFree ((FcChar8 *)cache_hashed);
 828
 829         cache_hashed = FcDirCacheHashName (cache_file, collisions++);
 830         if (!cache_hashed)
 831             goto bail;
 832
 833         if (fd > 0)
 834             close (fd);
 835         fd = open(cache_hashed, O_RDONLY | O_BINARY);
 836         if (fd == -1)
 837         {
 838             FcStrFree ((FcChar8 *)cache_file);
 839             return FcTrue;
 840         }
 841
 842         if (!FcCacheReadString (fd, name_buf, sizeof (name_buf)) || !strlen(name_buf))
 843         {
 844             FcStrFree ((FcChar8 *)cache_hashed);
 845             goto bail;
 846         }
 847     } while (strcmp (name_buf, cache_file) != 0);
 848
 849     close (fd);
 850
 851     if (stat ((char *) cache_hashed, &cache_stat) == 0 &&
 852         unlink ((char *)cache_hashed) != 0)
 853     {
 854         FcStrFree ((FcChar8 *)cache_hashed);
 855         goto bail;
 856     }
 857
 858     FcStrFree ((FcChar8 *)cache_file);
 859     FcStrFree ((FcChar8 *)cache_hashed);
 860     return FcTrue;
 861
 862  bail:
 863     FcStrFree ((FcChar8 *)cache_file);
 864     return FcFalse;
 865 }
 866
 867 static int
 868 FcCacheReadDirs (FcConfig * config, FcGlobalCache * cache,
 869                  FcStrList *list, FcFontSet * set, FcStrSet *processed_dirs)
 870 {
 871     int                 ret = 0;
 872     FcChar8             *dir;
 873     FcStrSet            *subdirs;
 874     FcStrList           *sublist;
 875     struct stat         statb;
 876     FcGlobalCacheDir   *d;
 877
 878     /*
 879      * Read in the results from 'list'.
 880      */
 881     while ((dir = FcStrListNext (list)))
 882     {
 883         if (!FcConfigAcceptFilename (config, dir))
 884             continue;
 885
 886         /* Skip this directory if already updated
 887          * to avoid the looped directories via symlinks
 888          * Clearly a dir not in fonts.conf shouldn't be globally cached.
 889          */
 890         dir = (FcChar8 *)FcConfigNormalizeFontDir (config, dir);
 891         if (!dir)
 892             continue;
 893
 894         if (FcStrSetMember (processed_dirs, dir))
 895             continue;
 896         if (!FcStrSetAdd (processed_dirs, dir))
 897             continue;
 898
 899         subdirs = FcStrSetCreate ();
 900         if (!subdirs)
 901         {
 902             fprintf (stderr, "Can't create directory set\n");
 903             ret++;
 904             continue;
 905         }
 906
 907         if (access ((char *) dir, X_OK) < 0)
 908         {
 909             switch (errno) {
 910             case ENOENT:
 911             case ENOTDIR:
 912             case EACCES:
 913                 break;
 914             default:
 915                 fprintf (stderr, "\"%s\": ", dir);
 916                 perror ("");
 917                 ret++;
 918             }
 919             FcStrSetDestroy (subdirs);
 920             continue;
 921         }
 922         if (stat ((char *) dir, &statb) == -1)
 923         {
 924             fprintf (stderr, "\"%s\": ", dir);
 925             perror ("");
 926             FcStrSetDestroy (subdirs);
 927             ret++;
 928             continue;
 929         }
 930         if (!S_ISDIR (statb.st_mode))
 931         {
 932             fprintf (stderr, "\"%s\": not a directory, skipping\n", dir);
 933             FcStrSetDestroy (subdirs);
 934             continue;
 935         }
 936         if (FcDirCacheValid (dir) &&
 937             FcDirCacheHasCurrentArch (dir) &&
 938             FcDirCacheRead (set, subdirs, dir, config))
 939         {
 940             /* if an old entry is found in the global cache, disable it */
 941             if ((d = FcGlobalCacheDirFind (cache, (const char *)dir)) != NULL)
 942             {
 943                 d->state = FcGCDirDisabled;
 944                 /* save the updated config later without this entry */
 945                 cache->updated = FcTrue;
 946             }
 947         }
 948         else
 949         {
 950             if (FcDebug () & FC_DBG_FONTSET)
 951                 printf ("cache scan dir %s\n", dir);
 952
 953             FcDirScanConfig (set, subdirs, cache,
 954                              config->blanks, dir, FcFalse, config);
 955         }
 956         sublist = FcStrListCreate (subdirs);
 957         FcStrSetDestroy (subdirs);
 958         if (!sublist)
 959         {
 960             fprintf (stderr, "Can't create subdir list in \"%s\"\n", dir);
 961             ret++;
 962             continue;
 963         }
 964         ret += FcCacheReadDirs (config, cache, sublist, set, processed_dirs);
 965     }
 966     FcStrListDone (list);
 967     return ret;
 968 }
 969
 970 FcFontSet *
 971 FcCacheRead (FcConfig *config, FcGlobalCache * cache)
 972 {
 973     FcFontSet   *s = FcFontSetCreate();
 974     FcStrSet    *processed_dirs;
 975
 976     if (!s)
 977         return 0;
 978
 979     processed_dirs = FcStrSetCreate();
 980     if (!processed_dirs)
 981         goto bail;
 982
 983     if (FcCacheReadDirs (config, cache, FcConfigGetConfigDirs (config), s, processed_dirs))
 984         goto bail1;
 985
 986     FcStrSetDestroy (processed_dirs);
 987     return s;
 988
 989  bail1:
 990     FcStrSetDestroy (processed_dirs);
 991  bail:
 992     FcFontSetDestroy (s);
 993     return 0;
 994 }
 995
 996 static const char bin2hex[] = { '0', '1', '2', '3',
 997                                 '4', '5', '6', '7',
 998                                 '8', '9', 'a', 'b',
 999                                 'c', 'd', 'e', 'f' };
1000
1001 static char *
1002 FcDirCacheHashName (char * cache_file, int collisions)
1003 {
1004     unsigned char       hash[16], hex_hash[33];
1005     char                *cache_hashed;
1006     unsigned char       uscore = '_';
1007     int                 cnt, i;
1008     FcChar8             *tmp;
1009     struct MD5Context   ctx;
1010
1011     MD5Init (&ctx);
1012     MD5Update (&ctx, (unsigned char *)cache_file, strlen (cache_file));
1013
1014     for (i = 0; i < collisions; i++)
1015         MD5Update (&ctx, &uscore, 1);
1016
1017     MD5Final (hash, &ctx);
1018
1019     for (cnt = 0; cnt < 16; ++cnt)
1020     {
1021         hex_hash[2*cnt] = bin2hex[hash[cnt] >> 4];
1022         hex_hash[2*cnt+1] = bin2hex[hash[cnt] & 0xf];
1023     }
1024     hex_hash[32] = 0;
1025
1026     tmp = FcStrPlus ((FcChar8 *)hex_hash, (FcChar8 *)FC_CACHE_SUFFIX);
1027     if (!tmp)
1028         return 0;
1029
1030     cache_hashed = (char *)FcStrPlus ((FcChar8 *)PKGCACHEDIR"/", tmp);
1031     free (tmp);
1032
1033     return cache_hashed;
1034 }
1035
1036 /* Opens the hashed name for cache_file.
1037  * This would fail in the unlikely event of a collision and subsequent
1038  * removal of the file which originally caused the collision. */
1039 static int
1040 FcDirCacheOpen (const FcChar8 *dir)
1041 {
1042     FcBool      found;
1043     int         fd = -1, collisions = 0;
1044     char        *cache_file, *cache_hashed;
1045     char        name_buf[FC_MAX_FILE_LEN];
1046     struct stat dir_stat;
1047
1048     if (stat ((char *)dir, &dir_stat) == -1)
1049         return -1;
1050
1051     cache_file = (char *)FcStrPlus (dir, (FcChar8 *) "/" FC_DIR_CACHE_FILE);
1052     if (!cache_file)
1053         return -1;
1054
1055     found = FcFalse;
1056     do
1057     {
1058         struct stat     c;
1059         FcChar8         *name_buf_dir;
1060
1061         if (fd >= 0)
1062             close (fd);
1063
1064         cache_hashed = FcDirCacheHashName (cache_file, collisions++);
1065         if (!cache_hashed)
1066         {
1067             FcStrFree ((FcChar8 *)cache_file);
1068             return -1;
1069         }
1070
1071         fd = open(cache_hashed, O_RDONLY | O_BINARY);
1072         FcStrFree ((FcChar8 *)cache_hashed);
1073
1074         if (fd == -1)
1075             break;
1076         if (!FcCacheReadString (fd, name_buf, sizeof (name_buf)) ||
1077             !strlen(name_buf))
1078             break;
1079
1080         name_buf_dir = FcStrDirname ((FcChar8 *)name_buf);
1081         if (stat ((char *)name_buf_dir, &c) == -1)
1082         {
1083             FcStrFree (name_buf_dir);
1084             continue;
1085         }
1086         FcStrFree (name_buf_dir);
1087         found = (c.st_ino == dir_stat.st_ino) && (c.st_dev == dir_stat.st_dev);
1088     } while (!found);
1089
1090     if (!found || fd < 0)
1091     {
1092         if (fd >= 0)
1093             close (fd);
1094         fd = open(cache_file, O_RDONLY | O_BINARY);
1095     }
1096
1097     FcStrFree ((FcChar8 *)cache_file);
1098     return fd;
1099 }
1100
1101 /* read serialized state from the cache file */
1102 FcBool
1103 FcDirCacheRead (FcFontSet * set, FcStrSet * dirs, const FcChar8 *dir, FcConfig *config)
1104 {
1105     int         fd;
1106     char        *current_arch_machine_name;
1107     char        candidate_arch_machine_name[9+MACHINE_SIGNATURE_SIZE];
1108     off_t       current_arch_start = 0;
1109     char        subdirName[FC_MAX_FILE_LEN + 1 + 12 + 1];
1110
1111     fd = FcDirCacheOpen (dir);
1112     if (fd < 0)
1113         goto bail;
1114
1115     current_arch_machine_name = FcCacheMachineSignature();
1116     current_arch_start = FcCacheSkipToArch(fd,
1117                                            current_arch_machine_name);
1118     if (current_arch_start < 0)
1119         goto bail1;
1120
1121     lseek (fd, current_arch_start, SEEK_SET);
1122     if (FcCacheReadString (fd, candidate_arch_machine_name,
1123                            sizeof (candidate_arch_machine_name)) == 0)
1124         goto bail1;
1125
1126     while (FcCacheReadString (fd, subdirName, sizeof (subdirName)) && strlen (subdirName) > 0)
1127         FcStrSetAdd (dirs, (FcChar8 *)subdirName);
1128
1129     if (!FcDirCacheConsume (fd, (const char *)dir, set, config))
1130         goto bail1;
1131
1132     close(fd);
1133     return FcTrue;
1134
1135  bail1:
1136     close (fd);
1137  bail:
1138     return FcFalse;
1139 }
1140
1141 static FcBool
1142 FcDirCacheConsume (int fd, const char * dir, FcFontSet *set, FcConfig *config)
1143 {
1144     FcCache metadata;
1145     void * current_dir_block;
1146     off_t pos;
1147
1148     if (read(fd, &metadata, sizeof(FcCache)) != sizeof(FcCache))
1149         return FcFalse;
1150     if (metadata.magic != FC_CACHE_MAGIC)
1151         return FcFalse;
1152
1153     if (!metadata.count)
1154     {
1155         pos = FcCacheNextOffset (lseek(fd, 0, SEEK_CUR));
1156         lseek (fd, pos, SEEK_SET);
1157         if (config)
1158             FcConfigAddFontDir (config, (FcChar8 *)dir);
1159         return FcTrue;
1160     }
1161
1162     pos = FcCacheNextOffset (lseek(fd, 0, SEEK_CUR));
1163     current_dir_block = mmap (0, metadata.count,
1164                               PROT_READ, MAP_SHARED, fd, pos);
1165     lseek (fd, pos+metadata.count, SEEK_SET);
1166     if (current_dir_block == MAP_FAILED)
1167         return FcFalse;
1168
1169     FcCacheAddBankDir (metadata.bank, dir);
1170     if (config)
1171         FcConfigAddFontDir (config, (FcChar8 *)dir);
1172
1173     if (!FcFontSetUnserialize (&metadata, set, current_dir_block))
1174         return FcFalse;
1175
1176     return FcTrue;
1177 }
1178
1179 static void *
1180 FcDirCacheProduce (FcFontSet *set, FcCache *metadata)
1181 {
1182     void * current_dir_block, * final_dir_block;
1183     static unsigned int rand_state = 0;
1184     int bank, needed_bytes_no_align;
1185
1186     if (!rand_state)
1187         rand_state = time(0L);
1188     bank = rand_r(&rand_state);
1189
1190     while (FcCacheHaveBank(bank))
1191         bank = rand_r(&rand_state);
1192
1193     memset (metadata, 0, sizeof(FcCache));
1194     FcFontSetNewBank();
1195     needed_bytes_no_align = FcFontSetNeededBytes (set);
1196     metadata->count = needed_bytes_no_align +
1197         FcFontSetNeededBytesAlign ();
1198     metadata->magic = FC_CACHE_MAGIC;
1199     metadata->bank = bank;
1200
1201     if (!needed_bytes_no_align) /* not a failure, no fonts to write */
1202     {
1203         /* no, you don't really need to write any bytes at all. */
1204         metadata->count = 0;
1205         return 0;
1206     }
1207
1208     current_dir_block = malloc (metadata->count);
1209     if (!current_dir_block)
1210         goto bail;
1211     /* shut up valgrind */
1212     memset (current_dir_block, 0, metadata->count);
1213     final_dir_block = FcFontSetDistributeBytes (metadata, current_dir_block);
1214
1215     if ((void *)((char *)current_dir_block+metadata->count) < final_dir_block)
1216         goto bail;
1217
1218     if (!FcFontSetSerialize (bank, set))
1219         goto bail;
1220
1221     return current_dir_block;
1222
1223  bail:
1224     free (current_dir_block);
1225     return 0;
1226 }
1227
1228 /* write serialized state to the cache file */
1229 FcBool
1230 FcDirCacheWrite (FcFontSet *set, FcStrSet *dirs, const FcChar8 *dir)
1231 {
1232     char            *cache_file;
1233     char            *cache_hashed;
1234     int             fd, fd_orig, i, dirs_count;
1235     FcAtomic        *atomic;
1236     FcCache         metadata;
1237     off_t           current_arch_start = 0, truncate_to;
1238     char            name_buf[FC_MAX_FILE_LEN];
1239     int             collisions;
1240
1241     char            *current_arch_machine_name, * header;
1242     void            *current_dir_block = 0;
1243
1244     dir = FcConfigNormalizeFontDir (FcConfigGetCurrent(), dir);
1245     if (!dir)
1246         return FcFalse;
1247
1248     cache_file = (char *)FcStrPlus (dir, (FcChar8 *) "/" FC_DIR_CACHE_FILE);
1249     if (!cache_file)
1250         goto bail;
1251
1252     /* Ensure that we're not trampling a cache for some other dir. */
1253     /* This is slightly different from FcDirCacheOpen, since it
1254      * needs the filename, not the file descriptor. */
1255     fd = -1; collisions = 0;
1256     do
1257     {
1258         cache_hashed = FcDirCacheHashName (cache_file, collisions++);
1259         if (!cache_hashed)
1260             goto bail0;
1261
1262         if (fd > 0)
1263             close (fd);
1264         fd = open(cache_hashed, O_RDONLY | O_BINARY);
1265         if (fd == -1)
1266             break;
1267         if(!FcCacheReadString (fd, name_buf, sizeof (name_buf)) || !strlen(name_buf))
1268         {
1269             close (fd);
1270             continue;
1271         }
1272         close (fd);
1273
1274         if (strcmp (name_buf, cache_file) != 0)
1275             continue;
1276
1277         break;
1278     } while (1);
1279
1280     current_dir_block = FcDirCacheProduce (set, &metadata);
1281
1282     if (metadata.count && !current_dir_block)
1283         goto bail1;
1284
1285     if (FcDebug () & FC_DBG_CACHE)
1286         printf ("FcDirCacheWriteDir cache_file \"%s\"\n", cache_file);
1287
1288     atomic = FcAtomicCreate ((FcChar8 *)cache_hashed);
1289     if (!atomic)
1290         goto bail1;
1291
1292     if (!FcAtomicLock (atomic))
1293     {
1294         /* Now try rewriting the original version of the file. */
1295         FcAtomicDestroy (atomic);
1296
1297         atomic = FcAtomicCreate ((FcChar8 *)cache_file);
1298         fd_orig = open (cache_file, O_RDONLY | O_BINARY);
1299         if (fd_orig == -1)
1300             fd_orig = open((char *)FcAtomicOrigFile (atomic), O_RDONLY | O_BINARY);
1301
1302         fd = open((char *)FcAtomicNewFile (atomic), O_RDWR | O_CREAT | O_BINARY, 0666);
1303         if (fd == -1)
1304             goto bail2;
1305     }
1306
1307     /* In all cases, try opening the real location of the cache file first. */
1308     /* (even if that's not atomic.) */
1309     fd_orig = open (cache_file, O_RDONLY | O_BINARY);
1310     if (fd_orig == -1)
1311         fd_orig = open((char *)FcAtomicOrigFile (atomic), O_RDONLY | O_BINARY);
1312
1313     fd = open((char *)FcAtomicNewFile (atomic), O_RDWR | O_CREAT | O_BINARY, 0666);
1314     if (fd == -1)
1315         goto bail3;
1316
1317     FcCacheWriteString (fd, cache_file);
1318
1319     current_arch_machine_name = FcCacheMachineSignature ();
1320     current_arch_start = 0;
1321
1322     if (fd_orig != -1)
1323         current_arch_start =
1324             FcCacheSkipToArch(fd_orig, current_arch_machine_name);
1325
1326     if (current_arch_start < 0)
1327     {
1328         off_t offset = lseek(fd_orig, 0, SEEK_END);
1329         current_arch_start = FcCacheNextOffset (offset);
1330     }
1331
1332     if (fd_orig != -1 && !FcCacheCopyOld(fd, fd_orig, current_arch_start))
1333         goto bail4;
1334
1335     if (fd_orig != -1)
1336         close (fd_orig);
1337
1338     current_arch_start = lseek(fd, 0, SEEK_CUR);
1339     if (ftruncate (fd, current_arch_start) == -1)
1340         goto bail4;
1341
1342     /* allocate space for subdir names in this block */
1343     dirs_count = 0;
1344     for (i = 0; i < dirs->size; i++)
1345         dirs_count += strlen((char *)dirs->strs[i]) + 1;
1346     dirs_count ++;
1347
1348     /* now write the address of the next offset */
1349     truncate_to = FcCacheNextOffset (FcCacheNextOffset (current_arch_start + sizeof (FcCache) + dirs_count) + metadata.count) - current_arch_start;
1350     header = malloc (10 + strlen (current_arch_machine_name));
1351     if (!header)
1352         goto bail4;
1353     sprintf (header, "%8x ", (int)truncate_to);
1354     strcat (header, current_arch_machine_name);
1355     if (!FcCacheWriteString (fd, header))
1356         goto bail5;
1357
1358     for (i = 0; i < dirs->size; i++)
1359         FcCacheWriteString (fd, (char *)dirs->strs[i]);
1360     FcCacheWriteString (fd, "");
1361
1362     if (write (fd, &metadata, sizeof(FcCache)) != sizeof(FcCache))
1363     {
1364         perror("write metadata");
1365         goto bail5;
1366     }
1367     if (metadata.count)
1368     {
1369         off_t off = FcCacheNextOffset (lseek(fd, 0, SEEK_END));
1370         if (lseek (fd, off, SEEK_SET) != off)
1371             perror("lseek");
1372         else if (write (fd, current_dir_block, metadata.count) !=
1373                  metadata.count)
1374             perror("write current_dir_block");
1375         free (current_dir_block);
1376         current_dir_block = 0;
1377     }
1378
1379     /* this actually serves to pad out the cache file, if needed */
1380     if (ftruncate (fd, current_arch_start + truncate_to) == -1)
1381         goto bail5;
1382
1383     free (header);
1384     close(fd);
1385     if (!FcAtomicReplaceOrig(atomic))
1386         goto bail5;
1387     FcStrFree ((FcChar8 *)cache_hashed);
1388     FcStrFree ((FcChar8 *)cache_file);
1389     FcAtomicUnlock (atomic);
1390     FcAtomicDestroy (atomic);
1391     return FcTrue;
1392
1393  bail5:
1394     free (header);
1395  bail4:
1396     close (fd);
1397  bail3:
1398     FcAtomicUnlock (atomic);
1399  bail2:
1400     FcAtomicDestroy (atomic);
1401  bail1:
1402     FcStrFree ((FcChar8 *)cache_hashed);
1403  bail0:
1404     unlink ((char *)cache_file);
1405     FcStrFree ((FcChar8 *)cache_file);
1406     if (current_dir_block)
1407         free (current_dir_block);
1408  bail:
1409     return FcFalse;
1410 }
1411
1412 static char *
1413 FcCacheMachineSignature ()
1414 {
1415     static char buf[MACHINE_SIGNATURE_SIZE];
1416     int32_t magic = ENDIAN_TEST;
1417     char * m = (char *)&magic;
1418
1419     sprintf (buf, "%2x%2x%2x%2x "
1420              "%4x %4x %4x %4x %4x %4x %4x %4x %4x %4x %4x %4x "
1421              "%4x %4x %4x %4x %4x %4x %4x %4x\n",
1422              m[0], m[1], m[2], m[3],
1423              (unsigned int)sizeof (char),
1424              (unsigned int)sizeof (char *),
1425              (unsigned int)sizeof (int),
1426              (unsigned int)sizeof (FcPattern),
1427              (unsigned int)sizeof (FcPatternEltPtr),
1428              (unsigned int)sizeof (struct _FcPatternElt *),
1429              (unsigned int)sizeof (FcPatternElt),
1430              (unsigned int)sizeof (FcObjectPtr),
1431              (unsigned int)sizeof (FcValueListPtr),
1432              (unsigned int)sizeof (FcValue),
1433              (unsigned int)sizeof (FcValueBinding),
1434              (unsigned int)sizeof (struct _FcValueList *),
1435              (unsigned int)sizeof (FcCharSet),
1436              (unsigned int)sizeof (FcCharLeaf **),
1437              (unsigned int)sizeof (FcChar16 *),
1438              (unsigned int)sizeof (FcChar16),
1439              (unsigned int)sizeof (FcCharLeaf),
1440              (unsigned int)sizeof (FcChar32),
1441              (unsigned int)sizeof (FcCache),
1442              (unsigned int)sysconf(_SC_PAGESIZE));
1443
1444     return buf;
1445 }
1446
1447 static int banks_ptr = 0, banks_alloc = 0;
1448 int * _fcBankId = 0, * _fcBankIdx = 0;
1449 static const char ** bankDirs = 0;
1450
1451 static FcBool
1452 FcCacheHaveBank (int bank)
1453 {
1454     int i;
1455
1456     if (bank < FC_BANK_FIRST)
1457         return FcTrue;
1458
1459     for (i = 0; i < banks_ptr; i++)
1460         if (_fcBankId[i] == bank)
1461             return FcTrue;
1462
1463     return FcFalse;
1464 }
1465
1466 int
1467 FcCacheBankToIndexMTF (int bank)
1468 {
1469     int i, j;
1470
1471     for (i = 0; i < banks_ptr; i++)
1472         if (_fcBankId[_fcBankIdx[i]] == bank)
1473         {
1474             int t = _fcBankIdx[i];
1475
1476             for (j = i; j > 0; j--)
1477                 _fcBankIdx[j] = _fcBankIdx[j-1];
1478             _fcBankIdx[0] = t;
1479             return t;
1480         }
1481
1482     if (banks_ptr >= banks_alloc)
1483     {
1484         int * b, * bidx;
1485         const char ** bds;
1486
1487         b = realloc (_fcBankId, (banks_alloc + 4) * sizeof(int));
1488         if (!b)
1489             return -1;
1490         _fcBankId = b;
1491
1492         bidx = realloc (_fcBankIdx, (banks_alloc + 4) * sizeof(int));
1493         if (!bidx)
1494             return -1;
1495         _fcBankIdx = bidx;
1496
1497         bds = realloc (bankDirs, (banks_alloc + 4) * sizeof (char *));
1498         if (!bds)
1499             return -1;
1500         bankDirs = bds;
1501
1502         banks_alloc += 4;
1503     }
1504
1505     i = banks_ptr++;
1506     _fcBankId[i] = bank;
1507     _fcBankIdx[i] = i;
1508     return i;
1509 }
1510
1511 static void
1512 FcCacheAddBankDir (int bank, const char * dir)
1513 {
1514     int bi = FcCacheBankToIndexMTF (bank);
1515
1516     if (bi < 0)
1517         return;
1518
1519     bankDirs[bi] = (const char *)FcStrCopy ((FcChar8 *)dir);
1520 }
1521
1522 const char *
1523 FcCacheFindBankDir (int bank)
1524 {
1525     int bi = FcCacheBankToIndex (bank);
1526     return bankDirs[bi];
1527 }
1528
1529 /*
1530  * This code implements the MD5 message-digest algorithm.
1531  * The algorithm is due to Ron Rivest.  This code was
1532  * written by Colin Plumb in 1993, no copyright is claimed.
1533  * This code is in the public domain; do with it what you wish.
1534  *
1535  * Equivalent code is available from RSA Data Security, Inc.
1536  * This code has been tested against that, and is equivalent,
1537  * except that you don't need to include two pages of legalese
1538  * with every copy.
1539  *
1540  * To compute the message digest of a chunk of bytes, declare an
1541  * MD5Context structure, pass it to MD5Init, call MD5Update as
1542  * needed on buffers full of bytes, and then call MD5Final, which
1543  * will fill a supplied 16-byte array with the digest.
1544  */
1545
1546 #ifndef HIGHFIRST
1547 #define byteReverse(buf, len)   /* Nothing */
1548 #else
1549 /*
1550  * Note: this code is harmless on little-endian machines.
1551  */
1552 void byteReverse(unsigned char *buf, unsigned longs)
1553 {
1554     FcChar32 t;
1555     do {
1556         t = (FcChar32) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
1557             ((unsigned) buf[1] << 8 | buf[0]);
1558         *(FcChar32 *) buf = t;
1559         buf += 4;
1560     } while (--longs);
1561 }
1562 #endif
1563
1564 /*
1565  * Start MD5 accumulation.  Set bit count to 0 and buffer to mysterious
1566  * initialization constants.
1567  */
1568 static void MD5Init(struct MD5Context *ctx)
1569 {
1570     ctx->buf[0] = 0x67452301;
1571     ctx->buf[1] = 0xefcdab89;
1572     ctx->buf[2] = 0x98badcfe;
1573     ctx->buf[3] = 0x10325476;
1574
1575     ctx->bits[0] = 0;
1576     ctx->bits[1] = 0;
1577 }
1578
1579 /*
1580  * Update context to reflect the concatenation of another buffer full
1581  * of bytes.
1582  */
1583 static void MD5Update(struct MD5Context *ctx, unsigned char *buf, unsigned len)
1584 {
1585     FcChar32 t;
1586
1587     /* Update bitcount */
1588
1589     t = ctx->bits[0];
1590     if ((ctx->bits[0] = t + ((FcChar32) len << 3)) < t)
1591         ctx->bits[1]++;         /* Carry from low to high */
1592     ctx->bits[1] += len >> 29;
1593
1594     t = (t >> 3) & 0x3f;        /* Bytes already in shsInfo->data */
1595
1596     /* Handle any leading odd-sized chunks */
1597
1598     if (t) {
1599         unsigned char *p = (unsigned char *) ctx->in + t;
1600
1601         t = 64 - t;
1602         if (len < t) {
1603             memcpy(p, buf, len);
1604             return;
1605         }
1606         memcpy(p, buf, t);
1607         byteReverse(ctx->in, 16);
1608         MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
1609         buf += t;
1610         len -= t;
1611     }
1612     /* Process data in 64-byte chunks */
1613
1614     while (len >= 64) {
1615         memcpy(ctx->in, buf, 64);
1616         byteReverse(ctx->in, 16);
1617         MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
1618         buf += 64;
1619         len -= 64;
1620     }
1621
1622     /* Handle any remaining bytes of data. */
1623
1624     memcpy(ctx->in, buf, len);
1625 }
1626
1627 /*
1628  * Final wrapup - pad to 64-byte boundary with the bit pattern
1629  * 1 0* (64-bit count of bits processed, MSB-first)
1630  */
1631 static void MD5Final(unsigned char digest[16], struct MD5Context *ctx)
1632 {
1633     unsigned count;
1634     unsigned char *p;
1635
1636     /* Compute number of bytes mod 64 */
1637     count = (ctx->bits[0] >> 3) & 0x3F;
1638
1639     /* Set the first char of padding to 0x80.  This is safe since there is
1640        always at least one byte free */
1641     p = ctx->in + count;
1642     *p++ = 0x80;
1643
1644     /* Bytes of padding needed to make 64 bytes */
1645     count = 64 - 1 - count;
1646
1647     /* Pad out to 56 mod 64 */
1648     if (count < 8) {
1649         /* Two lots of padding:  Pad the first block to 64 bytes */
1650         memset(p, 0, count);
1651         byteReverse(ctx->in, 16);
1652         MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
1653
1654         /* Now fill the next block with 56 bytes */
1655         memset(ctx->in, 0, 56);
1656     } else {
1657         /* Pad block to 56 bytes */
1658         memset(p, 0, count - 8);
1659     }
1660     byteReverse(ctx->in, 14);
1661
1662     /* Append length in bits and transform */
1663     ((FcChar32 *) ctx->in)[14] = ctx->bits[0];
1664     ((FcChar32 *) ctx->in)[15] = ctx->bits[1];
1665
1666     MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
1667     byteReverse((unsigned char *) ctx->buf, 4);
1668     memcpy(digest, ctx->buf, 16);
1669     memset(ctx, 0, sizeof(ctx));        /* In case it's sensitive */
1670 }
1671
1672
1673 /* The four core functions - F1 is optimized somewhat */
1674
1675 /* #define F1(x, y, z) (x & y | ~x & z) */
1676 #define F1(x, y, z) (z ^ (x & (y ^ z)))
1677 #define F2(x, y, z) F1(z, x, y)
1678 #define F3(x, y, z) (x ^ y ^ z)
1679 #define F4(x, y, z) (y ^ (x | ~z))
1680
1681 /* This is the central step in the MD5 algorithm. */
1682 #define MD5STEP(f, w, x, y, z, data, s) \
1683         ( w += f(x, y, z) + data,  w = w<<s | w>>(32-s),  w += x )
1684
1685 /*
1686  * The core of the MD5 algorithm, this alters an existing MD5 hash to
1687  * reflect the addition of 16 longwords of new data.  MD5Update blocks
1688  * the data and converts bytes into longwords for this routine.
1689  */
1690 static void MD5Transform(FcChar32 buf[4], FcChar32 in[16])
1691 {
1692     register FcChar32 a, b, c, d;
1693
1694     a = buf[0];
1695     b = buf[1];
1696     c = buf[2];
1697     d = buf[3];
1698
1699     MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
1700     MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
1701     MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
1702     MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
1703     MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
1704     MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
1705     MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
1706     MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
1707     MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
1708     MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
1709     MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
1710     MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
1711     MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
1712     MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
1713     MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
1714     MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
1715
1716     MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
1717     MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
1718     MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
1719     MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
1720     MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
1721     MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
1722     MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
1723     MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
1724     MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
1725     MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
1726     MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
1727     MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
1728     MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
1729     MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
1730     MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
1731     MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
1732
1733     MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
1734     MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
1735     MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
1736     MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
1737     MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
1738     MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
1739     MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
1740     MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
1741     MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
1742     MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
1743     MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
1744     MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
1745     MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
1746     MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
1747     MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
1748     MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
1749
1750     MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
1751     MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
1752     MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
1753     MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
1754     MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
1755     MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
1756     MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
1757     MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
1758     MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
1759     MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
1760     MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
1761     MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
1762     MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
1763     MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
1764     MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
1765     MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
1766
1767     buf[0] += a;
1768     buf[1] += b;
1769     buf[2] += c;
1770     buf[3] += d;
1771 }