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