src/fccache.c

   1 /*
   2  * $RCSId: xc/lib/fontconfig/src/fccache.c,v 1.12 2002/08/22 07:36:44 keithp Exp $
   3  *
   4  * Copyright © 2000 Keith Packard
   5  * Copyright © 2005 Patrick Lam
   6  *
   7  * Permission to use, copy, modify, distribute, and sell this software and its
   8  * documentation for any purpose is hereby granted without fee, provided that
   9  * the above copyright notice appear in all copies and that both that
  10  * copyright notice and this permission notice appear in supporting
  11  * documentation, and that the name of Keith Packard not be used in
  12  * advertising or publicity pertaining to distribution of the software without
  13  * specific, written prior permission.  Keith Packard makes no
  14  * representations about the suitability of this software for any purpose.  It
  15  * is provided "as is" without express or implied warranty.
  16  *
  17  * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  18  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  19  * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  20  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  21  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  22  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  23  * PERFORMANCE OF THIS SOFTWARE.
  24  */
  25
  26 #include "fcint.h"
  27 #include <fcntl.h>
  28 #include <dirent.h>
  29 #include <string.h>
  30 #include <sys/types.h>
  31 #if defined(HAVE_MMAP) || defined(__CYGWIN__)
  32 #  include <unistd.h>
  33 #  include <sys/mman.h>
  34 #elif defined(_WIN32)
  35 #  include <windows.h>
  36 #endif
  37
  38 #define ENDIAN_TEST 0x12345678
  39 #define MACHINE_SIGNATURE_SIZE (9 + 5*20 + 1)
  40 /* for when we don't have sysconf: */
  41 #define FC_HARDCODED_PAGESIZE 8192
  42
  43 #ifndef O_BINARY
  44 #define O_BINARY 0
  45 #endif
  46
  47 static int
  48 FcDirCacheOpen (const FcChar8 * dir);
  49
  50 static char *
  51 FcDirCacheHashName (const FcChar8 * dir, int collisions);
  52
  53 static off_t
  54 FcCacheSkipToArch (int fd, const char * arch);
  55
  56 static FcBool
  57 FcCacheCopyOld (int fd, int fd_orig, off_t start);
  58
  59 static void *
  60 FcDirCacheProduce (FcFontSet *set, FcCache * metadata);
  61
  62 static FcBool
  63 FcDirCacheConsume (int fd, const char * dir, FcFontSet *set, FcConfig *config);
  64
  65 static int
  66 FcCacheNextOffset(off_t w);
  67
  68 static char *
  69 FcCacheMachineSignature (void);
  70
  71 static FcBool
  72 FcCacheHaveBank (int bank);
  73
  74 static void
  75 FcCacheAddBankDir (int bank, const char * dir);
  76
  77 struct MD5Context {
  78         FcChar32 buf[4];
  79         FcChar32 bits[2];
  80         unsigned char in[64];
  81 };
  82
  83 static void MD5Init(struct MD5Context *ctx);
  84 static void MD5Update(struct MD5Context *ctx, unsigned char *buf, unsigned len);
  85 static void MD5Final(unsigned char digest[16], struct MD5Context *ctx);
  86 static void MD5Transform(FcChar32 buf[4], FcChar32 in[16]);
  87
  88 #define FC_DBG_CACHE_REF    1024
  89
  90 static char *
  91 FcCacheReadString (int fd, char *dest, int len)
  92 {
  93     int    size;
  94     int    slen;
  95
  96     if (len == 0)
  97         return 0;
  98
  99     size = read (fd, dest, len-1);
 100
 101     if (size > 0)
 102     {
 103         dest[size] = '\0';
 104         slen = strlen (dest);
 105
 106         lseek (fd, slen - size + 1, SEEK_CUR);
 107         return slen < len ? dest : 0;
 108     }
 109
 110     return 0;
 111 }
 112
 113 static void
 114 FcCacheSkipString (int fd)
 115 {
 116     char buf[256];
 117     int  size;
 118     int  slen;
 119
 120     while ( (size = read (fd, buf, sizeof (buf)-1)) > 0)
 121     {
 122         buf [size] = '\0';
 123         slen = strlen (buf);
 124         if (slen < size)
 125         {
 126             lseek (fd, slen - size + 1, SEEK_CUR);
 127             return;
 128         }
 129     }
 130 }
 131
 132 static FcBool
 133 FcCacheWriteString (int fd, const char *chars)
 134 {
 135     if (write (fd, chars, strlen(chars)+1) != strlen(chars)+1)
 136         return FcFalse;
 137     return FcTrue;
 138 }
 139
 140 static void
 141 FcGlobalCacheDirDestroy (FcGlobalCacheDir *d)
 142 {
 143     FcStrSetDestroy (d->subdirs);
 144     FcMemFree (FC_MEM_STRING, strlen (d->name)+1);
 145     free (d->name);
 146     FcMemFree (FC_MEM_CACHE, sizeof (FcGlobalCacheDir));
 147     free (d);
 148 }
 149
 150 FcGlobalCache *
 151 FcGlobalCacheCreate (void)
 152 {
 153     FcGlobalCache   *cache;
 154
 155     cache = malloc (sizeof (FcGlobalCache));
 156     if (!cache)
 157         return 0;
 158     FcMemAlloc (FC_MEM_CACHE, sizeof (FcGlobalCache));
 159     cache->dirs = 0;
 160     cache->updated = FcFalse;
 161     cache->fd = -1;
 162     return cache;
 163 }
 164
 165 void
 166 FcGlobalCacheDestroy (FcGlobalCache *cache)
 167 {
 168     FcGlobalCacheDir    *d, *next;
 169
 170     for (d = cache->dirs; d; d = next)
 171     {
 172         next = d->next;
 173         FcGlobalCacheDirDestroy (d);
 174     }
 175     FcMemFree (FC_MEM_CACHE, sizeof (FcGlobalCache));
 176     free (cache);
 177 }
 178
 179 void
 180 FcGlobalCacheLoad (FcGlobalCache    *cache,
 181                    FcStrSet         *staleDirs,
 182                    const FcChar8    *cache_file,
 183                    FcConfig         *config)
 184 {
 185     char                name_buf[FC_MAX_FILE_LEN];
 186     FcGlobalCacheDir    *d, *next;
 187     FcFileTime          config_time = FcConfigModifiedTime (config);
 188     char                * current_arch_machine_name;
 189     char                candidate_arch_machine_name[MACHINE_SIGNATURE_SIZE + 9];
 190     off_t               current_arch_start;
 191
 192     struct stat         cache_stat, dir_stat;
 193     char                subdirName[FC_MAX_FILE_LEN + 1 + 12 + 1];
 194
 195     if (stat ((char *) cache_file, &cache_stat) < 0)
 196         return;
 197
 198     cache->fd = open ((char *) cache_file, O_RDONLY | O_BINARY);
 199     if (cache->fd == -1)
 200         return;
 201
 202     cache->updated = FcFalse;
 203
 204     if (!FcCacheReadString (cache->fd, name_buf, sizeof (name_buf)))
 205         goto bail_and_destroy;
 206     if (strcmp (name_buf, FC_GLOBAL_MAGIC_COOKIE) != 0)
 207         goto bail_and_destroy;
 208
 209     current_arch_machine_name = FcCacheMachineSignature ();
 210     current_arch_start = FcCacheSkipToArch(cache->fd,
 211                                            current_arch_machine_name);
 212     if (current_arch_start < 0)
 213         goto bail1;
 214
 215     lseek (cache->fd, current_arch_start, SEEK_SET);
 216     if (!FcCacheReadString (cache->fd, candidate_arch_machine_name,
 217                             sizeof (candidate_arch_machine_name)))
 218         goto bail_and_destroy;
 219     if (strlen(candidate_arch_machine_name) == 0)
 220         goto bail_and_destroy;
 221
 222     while (1)
 223     {
 224         off_t targ;
 225
 226         if (!FcCacheReadString (cache->fd, name_buf, sizeof (name_buf)) ||
 227             !strlen(name_buf))
 228             break;
 229
 230         /* Directory must be older than the global cache file; also
 231            cache must be newer than the config file. */
 232         if (stat ((char *) name_buf, &dir_stat) < 0 ||
 233             dir_stat.st_mtime > cache_stat.st_mtime ||
 234             (config_time.set && cache_stat.st_mtime < config_time.time))
 235         {
 236             FcCache md;
 237             off_t off;
 238
 239             FcStrSetAdd (staleDirs, (FcChar8 *)name_buf);
 240
 241             /* skip subdirs */
 242             while (FcCacheReadString (cache->fd, subdirName,
 243                                       sizeof (subdirName)) &&
 244                    strlen (subdirName))
 245                 ;
 246
 247             if (read (cache->fd, &md, sizeof (FcCache)) != sizeof(FcCache))
 248             {
 249                 perror ("read metadata");
 250                 goto bail1;
 251             }
 252             off = FcCacheNextOffset (lseek(cache->fd, 0, SEEK_CUR)) + md.count;
 253             if (lseek (cache->fd, off, SEEK_SET) != off)
 254             {
 255                 perror ("lseek");
 256                 goto bail1;
 257             }
 258             continue;
 259         }
 260
 261         d = malloc (sizeof (FcGlobalCacheDir));
 262         if (!d)
 263             goto bail1;
 264
 265         d->next = cache->dirs;
 266         cache->dirs = d;
 267
 268         d->name = (char *)FcStrCopy ((FcChar8 *)name_buf);
 269         d->ent = 0;
 270         d->state = FcGCDirFileRead;
 271
 272         d->subdirs = FcStrSetCreate();
 273         do
 274         {
 275             if (!FcCacheReadString (cache->fd, subdirName,
 276                                     sizeof (subdirName)) ||
 277                 !strlen (subdirName))
 278                 break;
 279             FcStrSetAdd (d->subdirs, (FcChar8 *)subdirName);
 280         } while (1);
 281
 282         d->offset = lseek (cache->fd, 0, SEEK_CUR);
 283         if (read (cache->fd, &d->metadata, sizeof (FcCache)) != sizeof (FcCache))
 284             goto bail1;
 285         targ = FcCacheNextOffset (lseek(cache->fd, 0, SEEK_CUR)) + d->metadata.count;
 286         if (lseek (cache->fd, targ, SEEK_SET) != targ)
 287             goto bail1;
 288     }
 289     return;
 290
 291  bail1:
 292     for (d = cache->dirs; d; d = next)
 293     {
 294         next = d->next;
 295         free (d);
 296     }
 297     cache->dirs = 0;
 298
 299     close (cache->fd);
 300     cache->fd = -1;
 301     return;
 302
 303  bail_and_destroy:
 304     close (cache->fd);
 305     cache->fd = -1;
 306
 307     if (stat ((char *) cache_file, &cache_stat) == 0)
 308         unlink ((char *)cache_file);
 309
 310     return;
 311
 312 }
 313
 314 FcBool
 315 FcGlobalCacheReadDir (FcFontSet *set, FcStrSet *dirs, FcGlobalCache * cache, const char *dir, FcConfig *config)
 316 {
 317     FcGlobalCacheDir    *d;
 318     int                 i;
 319
 320     if (cache->fd == -1)
 321         return FcFalse;
 322
 323     if (config)
 324         if (!(dir = (char *)FcConfigNormalizeFontDir (config, (FcChar8 *)dir)))
 325             return FcFalse; /* non-existing directory */
 326
 327     for (d = cache->dirs; d; d = d->next)
 328     {
 329         if (strcmp (d->name, dir) == 0)
 330         {
 331             if (d->state == FcGCDirDisabled)
 332                 return FcFalse;
 333
 334             if (d->state == FcGCDirFileRead)
 335             {
 336                 lseek (cache->fd, d->offset, SEEK_SET);
 337                 if (!FcDirCacheConsume (cache->fd, d->name, set, config))
 338                     return FcFalse;
 339
 340                 for (i = 0; i < d->subdirs->num; i++)
 341                     FcStrSetAdd (dirs, (FcChar8 *)d->subdirs->strs[i]);
 342
 343                 d->state = FcGCDirConsumed;
 344             }
 345             return FcTrue;
 346         }
 347     }
 348
 349     return FcFalse;
 350 }
 351
 352 static FcGlobalCacheDir *
 353 FcGlobalCacheDirFind (FcGlobalCache *cache, const char *name)
 354 {
 355     FcGlobalCacheDir * d;
 356
 357     if (!cache || !name)
 358         return NULL;
 359
 360     for (d = cache->dirs; d; d = d->next)
 361         if (strcmp((const char *)d->name, (const char *)name) == 0)
 362             return d;
 363
 364     return NULL;
 365  }
 366
 367 FcBool
 368 FcGlobalCacheUpdate (FcGlobalCache  *cache,
 369                      FcStrSet       *dirs,
 370                      const char     *orig_name,
 371                      FcFontSet      *set,
 372                      FcConfig       *config)
 373 {
 374     FcGlobalCacheDir    *d;
 375     int                 i;
 376     const char *name;
 377
 378     name = (char *)FcConfigNormalizeFontDir (config, (FcChar8 *)orig_name);
 379     if (!name)
 380     {
 381         fprintf(stderr, "Invalid directory name %s\n", orig_name);
 382         return FcFalse;
 383     }
 384
 385     d = FcGlobalCacheDirFind (cache, name);
 386
 387     if (!d)
 388     {
 389         d = malloc (sizeof (FcGlobalCacheDir));
 390         if (!d)
 391             return FcFalse;
 392         d->next = cache->dirs;
 393         cache->dirs = d;
 394     } else {
 395         /* free old resources */
 396         FcStrFree ((FcChar8 *)d->name);
 397         free (d->ent);
 398         FcStrSetDestroy (d->subdirs);
 399     }
 400
 401     cache->updated = FcTrue;
 402
 403     d->name = (char *)FcStrCopy ((FcChar8 *)name);
 404     d->ent = FcDirCacheProduce (set, &d->metadata);
 405     d->offset = 0;
 406     d->subdirs = FcStrSetCreate();
 407     d->state = FcGCDirUpdated;
 408     for (i = 0; i < dirs->num; i++)
 409         FcStrSetAdd (d->subdirs, dirs->strs[i]);
 410     return FcTrue;
 411 }
 412
 413 FcBool
 414 FcGlobalCacheSave (FcGlobalCache    *cache,
 415                    const FcChar8    *cache_file,
 416                    FcConfig         *config)
 417 {
 418     int                 fd, fd_orig;
 419     FcGlobalCacheDir    *dir;
 420     FcAtomic            *atomic;
 421     off_t               current_arch_start = 0, truncate_to;
 422     char                * current_arch_machine_name, * header;
 423
 424     if (!cache->updated)
 425         return FcTrue;
 426
 427 #if defined (HAVE_GETUID) && defined (HAVE_GETEUID)
 428     /* Set-UID programs can't safely update the cache */
 429     if (getuid () != geteuid ())
 430         return FcFalse;
 431 #endif
 432
 433     atomic = FcAtomicCreate (cache_file);
 434     if (!atomic)
 435         return FcFalse;
 436
 437     if (!FcAtomicLock (atomic))
 438         goto bail1;
 439     fd = open ((char *) FcAtomicNewFile(atomic), O_RDWR | O_CREAT | O_BINARY,
 440                S_IRUSR | S_IWUSR);
 441     if (fd == -1)
 442         goto bail2;
 443     FcCacheWriteString (fd, FC_GLOBAL_MAGIC_COOKIE);
 444
 445     fd_orig = open ((char *) FcAtomicOrigFile(atomic), O_RDONLY | O_BINARY);
 446
 447     current_arch_machine_name = FcCacheMachineSignature ();
 448     if (fd_orig == -1)
 449         current_arch_start = 0;
 450     else
 451         current_arch_start = FcCacheSkipToArch (fd_orig,
 452                                                 current_arch_machine_name);
 453
 454     if (current_arch_start < 0)
 455     {
 456         off_t i = lseek(fd_orig, 0, SEEK_END);
 457         if (i < strlen (FC_GLOBAL_MAGIC_COOKIE)+1)
 458             i = strlen (FC_GLOBAL_MAGIC_COOKIE)+1;
 459         current_arch_start = FcCacheNextOffset (i);
 460     }
 461
 462     if (!FcCacheCopyOld(fd, fd_orig, current_arch_start))
 463         goto bail3;
 464
 465     current_arch_start = lseek(fd, 0, SEEK_CUR);
 466 #if defined (HAVE_FTRUNCATE)
 467     if (ftruncate (fd, current_arch_start) == -1)
 468         goto bail3;
 469 #else
 470 #if defined (HAVE_CHSIZE)
 471     if (chsize (fd, current_arch_start) == -1)
 472         goto bail3;
 473 #else
 474     goto bail3;
 475 #endif
 476 #endif
 477
 478     header = malloc (10 + strlen (current_arch_machine_name));
 479     if (!header)
 480         goto bail3;
 481
 482     truncate_to = current_arch_start + strlen(current_arch_machine_name) + 11;
 483     for (dir = cache->dirs; dir; dir = dir->next)
 484     {
 485         int i;
 486
 487         if (dir->state == FcGCDirDisabled)
 488             continue;
 489         truncate_to += strlen(dir->name) + 1;
 490         truncate_to += sizeof (FcCache);
 491         truncate_to = FcCacheNextOffset (truncate_to);
 492         truncate_to += dir->metadata.count;
 493
 494         for (i = 0; i < dir->subdirs->size; i++)
 495             truncate_to += strlen((char *)dir->subdirs->strs[i]) + 1;
 496         truncate_to ++;
 497     }
 498     truncate_to -= current_arch_start;
 499
 500     sprintf (header, "%8x ", (int)truncate_to);
 501     strcat (header, current_arch_machine_name);
 502     if (!FcCacheWriteString (fd, header))
 503         goto bail4;
 504
 505     free (header);
 506
 507     for (dir = cache->dirs; dir; dir = dir->next)
 508     {
 509         int i;
 510         const char * d;
 511         off_t off;
 512
 513         if (!dir->name || dir->state == FcGCDirDisabled)
 514             continue;
 515         d = (const char *)FcConfigNormalizeFontDir (config, (const FcChar8 *)dir->name);
 516         if (!d)
 517             continue;
 518
 519         if (dir->metadata.count && !dir->ent)
 520         {
 521             if (dir->state == FcGCDirUpdated || fd_orig < 0)
 522             {
 523                 fprintf(stderr, "Invalid metadata entry for %s, skipping...\n", d);
 524                 continue;
 525             }
 526             /* copy the old content */
 527             dir->ent = malloc (dir->metadata.count);
 528             if (!dir->ent)
 529             {
 530                 perror("malloc error");
 531                 continue;
 532             }
 533             off = FcCacheNextOffset (dir->offset + sizeof(FcCache));
 534             if (lseek (fd_orig, off, SEEK_SET) != off)
 535             {
 536                 perror("lseek");
 537                 free(dir->ent);
 538                 continue;
 539             }
 540             if (read (fd_orig, dir->ent, dir->metadata.count)
 541                 != dir->metadata.count)
 542             {
 543                 perror("read");
 544                 free(dir->ent);
 545                 continue;
 546             }
 547         }
 548
 549         FcCacheWriteString (fd, d);
 550
 551         for (i = 0; i < dir->subdirs->size; i++)
 552             FcCacheWriteString (fd, (char *)dir->subdirs->strs[i]);
 553         FcCacheWriteString (fd, "");
 554
 555         if (write (fd, &dir->metadata, sizeof(FcCache)) != sizeof(FcCache))
 556         {
 557             perror ("write metadata");
 558             free (dir->ent);
 559             continue;
 560         }
 561         off = FcCacheNextOffset (lseek(fd, 0, SEEK_CUR));
 562         if (lseek (fd, off, SEEK_SET) != off)
 563         {
 564             perror ("lseek");
 565             free (dir->ent);
 566             continue;
 567         }
 568         if (dir->metadata.count)
 569         {
 570             if (write (fd, dir->ent, dir->metadata.count) != dir->metadata.count)
 571             {
 572                 perror ("write dirent");
 573                 free (dir->ent);
 574                 continue;
 575             }
 576         }
 577         free (dir->ent);
 578     }
 579     FcCacheWriteString (fd, "");
 580
 581     if (close (fd) == -1)
 582         goto bail25;
 583
 584     close (fd_orig);
 585     fd_orig = -1;
 586
 587     if (!FcAtomicReplaceOrig (atomic))
 588         goto bail25;
 589
 590     FcAtomicUnlock (atomic);
 591     FcAtomicDestroy (atomic);
 592
 593     cache->updated = FcFalse;
 594     return FcTrue;
 595
 596  bail4:
 597     free (header);
 598  bail3:
 599     if (fd_orig != -1)
 600         close (fd_orig);
 601
 602     close (fd);
 603  bail25:
 604     FcAtomicDeleteNew (atomic);
 605  bail2:
 606     FcAtomicUnlock (atomic);
 607  bail1:
 608     FcAtomicDestroy (atomic);
 609     return FcFalse;
 610 }
 611
 612 /*
 613  * Find the next presumably-mmapable offset after the supplied file
 614  * position.
 615  */
 616 static int
 617 FcCacheNextOffset(off_t w)
 618 {
 619     static long pagesize = -1;
 620
 621     if (w == -1)
 622         return w;
 623
 624     if (pagesize == -1)
 625 #if defined (HAVE_SYSCONF)
 626         pagesize = sysconf(_SC_PAGESIZE);
 627 #else
 628         pagesize = FC_HARDCODED_PAGESIZE;
 629 #endif
 630     if (w % pagesize == 0)
 631         return w;
 632     else
 633         return ((w / pagesize)+1)*pagesize;
 634 }
 635
 636 /* return the address of the segment for the provided arch,
 637  * or -1 if arch not found */
 638 static off_t
 639 FcCacheSkipToArch (int fd, const char * arch)
 640 {
 641     char candidate_arch_machine_name_count[MACHINE_SIGNATURE_SIZE + 9];
 642     char * candidate_arch;
 643     off_t current_arch_start = 0;
 644
 645     lseek (fd, 0, SEEK_SET);
 646     FcCacheSkipString (fd);
 647     current_arch_start = lseek (fd, 0, SEEK_CUR);
 648
 649     /* skip arches that are not the current arch */
 650     while (1)
 651     {
 652         long bs;
 653
 654         if (lseek (fd, current_arch_start, SEEK_SET) != current_arch_start)
 655             return -1;
 656
 657         if (FcCacheReadString (fd, candidate_arch_machine_name_count,
 658                                 sizeof (candidate_arch_machine_name_count)) == 0)
 659             return -1;
 660         if (!strlen(candidate_arch_machine_name_count))
 661             return -1;
 662         bs = strtol(candidate_arch_machine_name_count, &candidate_arch, 16);
 663
 664         /* count = 0 should probably be distinguished from the !bs condition */
 665         if (!bs || bs < strlen (candidate_arch_machine_name_count))
 666             return -1;
 667
 668         candidate_arch++; /* skip leading space */
 669
 670         if (strcmp (candidate_arch, arch)==0)
 671             return current_arch_start;
 672         current_arch_start += bs;
 673         current_arch_start = FcCacheNextOffset (current_arch_start);
 674     }
 675 }
 676
 677 /* Cuts out the segment at the file pointer (moves everything else
 678  * down to cover it), and leaves the file pointer at the end of the
 679  * file. */
 680 static FcBool
 681 FcCacheCopyOld (int fd, int fd_orig, off_t start)
 682 {
 683     char * buf = malloc (8192);
 684     char candidate_arch_machine_name[MACHINE_SIGNATURE_SIZE + 9];
 685     long bs;
 686     int c, bytes_skipped;
 687     off_t loc;
 688
 689     if (!buf)
 690         return FcFalse;
 691
 692     loc = 0;
 693     lseek (fd, 0, SEEK_SET); lseek (fd_orig, 0, SEEK_SET);
 694     FcCacheSkipString (fd); FcCacheSkipString (fd_orig);
 695     do
 696     {
 697         int b = 8192;
 698         if (loc + b > start)
 699             b = start - loc;
 700
 701         if ((c = read (fd_orig, buf, b)) <= 0)
 702             break;
 703         if (write (fd, buf, c) < 0)
 704             goto bail;
 705
 706         loc += c;
 707     }
 708     while (c > 0);
 709
 710     lseek (fd, start, SEEK_SET);
 711     if (FcCacheReadString (fd, candidate_arch_machine_name,
 712                            sizeof (candidate_arch_machine_name)) == 0)
 713         goto done;
 714     if (!strlen(candidate_arch_machine_name))
 715         goto done;
 716
 717     bs = strtol(candidate_arch_machine_name, 0, 16);
 718     if (bs == 0)
 719         goto done;
 720
 721     bytes_skipped = 0;
 722     do
 723     {
 724         lseek (fd, start+bs+bytes_skipped, SEEK_SET);
 725         if ((c = read (fd, buf, 8192)) <= 0)
 726             break;
 727         lseek (fd, start+bytes_skipped, SEEK_SET);
 728         if (write (fd, buf, c) < 0)
 729             goto bail;
 730         bytes_skipped += c;
 731     }
 732     while (c > 0);
 733     lseek (fd, start+bytes_skipped, SEEK_SET);
 734
 735  done:
 736     free (buf);
 737     return FcTrue;
 738
 739  bail:
 740     free (buf);
 741     return FcFalse;
 742 }
 743
 744 /* Does not check that the cache has the appropriate arch section. */
 745 /* Also, this can be fooled if the original location has a stale
 746  * cache, and the hashed location has an up-to-date cache.  Oh well,
 747  * sucks to be you in that case! */
 748 FcBool
 749 FcDirCacheValid (const FcChar8 *dir)
 750 {
 751     struct stat file_stat, dir_stat;
 752     int         fd;
 753
 754     if (stat ((char *) dir, &dir_stat) < 0)
 755         return FcFalse;
 756
 757     fd = FcDirCacheOpen (dir);
 758
 759     if (fd < 0)
 760         return FcFalse;
 761     if (fstat (fd, &file_stat) < 0)
 762         goto bail;
 763
 764     close (fd);
 765
 766     /*
 767      * If the directory has been modified more recently than
 768      * the cache file, the cache is not valid
 769      */
 770     if (dir_stat.st_mtime > file_stat.st_mtime)
 771         return FcFalse;
 772
 773     return FcTrue;
 774
 775  bail:
 776     close (fd);
 777     return FcFalse;
 778 }
 779
 780 /* Assumes that the cache file in 'dir' exists.
 781  * Checks that the cache has the appropriate arch section. */
 782 FcBool
 783 FcDirCacheHasCurrentArch (const FcChar8 *dir)
 784 {
 785     int         fd;
 786     off_t       current_arch_start;
 787     char        *current_arch_machine_name;
 788     FcCache     metadata;
 789     char        subdirName[FC_MAX_FILE_LEN + 1 + 12 + 1];
 790
 791     fd = FcDirCacheOpen (dir);
 792     if (fd < 0)
 793         goto bail;
 794
 795     current_arch_machine_name = FcCacheMachineSignature();
 796     current_arch_start = FcCacheSkipToArch(fd, current_arch_machine_name);
 797
 798     if (current_arch_start >= 0)
 799     {
 800         if (lseek (fd, current_arch_start, SEEK_SET) != current_arch_start)
 801             goto bail1;
 802
 803         FcCacheSkipString (fd);
 804
 805         while (FcCacheReadString (fd, subdirName, sizeof (subdirName)) && strlen (subdirName) > 0)
 806             ;
 807
 808         if (read(fd, &metadata, sizeof(FcCache)) != sizeof(FcCache))
 809             goto bail1;
 810
 811         if (metadata.magic != FC_CACHE_MAGIC)
 812             goto bail1;
 813     }
 814
 815     close (fd);
 816
 817     if (current_arch_start < 0)
 818         return FcFalse;
 819
 820     return FcTrue;
 821
 822  bail1:
 823     close (fd);
 824  bail:
 825     return FcFalse;
 826 }
 827
 828 FcBool
 829 FcDirCacheUnlink (const FcChar8 *dir, FcConfig *config)
 830 {
 831     char        *cache_hashed = 0;
 832     int         fd, collisions;
 833     struct stat cache_stat;
 834     char        dir_buf[FC_MAX_FILE_LEN];
 835
 836     dir = FcConfigNormalizeFontDir (config, dir);
 837
 838     /* Remove any applicable hashed files. */
 839     fd = -1; collisions = 0;
 840     do
 841     {
 842         if (cache_hashed)
 843             FcStrFree ((FcChar8 *)cache_hashed);
 844
 845         cache_hashed = FcDirCacheHashName (dir, collisions++);
 846         if (!cache_hashed)
 847             goto bail;
 848
 849         if (fd > 0)
 850             close (fd);
 851         fd = open(cache_hashed, O_RDONLY | O_BINARY);
 852         if (fd == -1)
 853         {
 854             FcStrFree ((FcChar8 *)cache_hashed);
 855             return FcTrue;
 856         }
 857
 858         if (!FcCacheReadString (fd, dir_buf, sizeof (dir_buf)) || !strlen(dir_buf))
 859         {
 860             FcStrFree ((FcChar8 *)cache_hashed);
 861             goto bail;
 862         }
 863     } while (strcmp ((char *) dir_buf, (char *) dir) != 0);
 864
 865     close (fd);
 866
 867     if (stat ((char *) cache_hashed, &cache_stat) == 0 &&
 868         unlink ((char *)cache_hashed) != 0)
 869     {
 870         FcStrFree ((FcChar8 *)cache_hashed);
 871         goto bail;
 872     }
 873
 874     FcStrFree ((FcChar8 *)cache_hashed);
 875     return FcTrue;
 876
 877  bail:
 878     return FcFalse;
 879 }
 880
 881 static int
 882 FcCacheReadDirs (FcConfig * config, FcGlobalCache * cache,
 883                  FcStrList *list, FcFontSet * set, FcStrSet *processed_dirs)
 884 {
 885     int                 ret = 0;
 886     FcChar8             *dir;
 887     FcStrSet            *subdirs;
 888     FcStrList           *sublist;
 889     struct stat         statb;
 890     FcGlobalCacheDir   *d;
 891
 892     /*
 893      * Read in the results from 'list'.
 894      */
 895     while ((dir = FcStrListNext (list)))
 896     {
 897         if (!FcConfigAcceptFilename (config, dir))
 898             continue;
 899
 900         /* Skip this directory if already updated
 901          * to avoid the looped directories via symlinks
 902          * Clearly a dir not in fonts.conf shouldn't be globally cached.
 903          */
 904         dir = (FcChar8 *)FcConfigNormalizeFontDir (config, dir);
 905         if (!dir)
 906             continue;
 907
 908         if (FcStrSetMember (processed_dirs, dir))
 909             continue;
 910         if (!FcStrSetAdd (processed_dirs, dir))
 911             continue;
 912
 913         subdirs = FcStrSetCreate ();
 914         if (!subdirs)
 915         {
 916             fprintf (stderr, "Can't create directory set\n");
 917             ret++;
 918             continue;
 919         }
 920
 921         if (access ((char *) dir, X_OK) < 0)
 922         {
 923             switch (errno) {
 924             case ENOENT:
 925             case ENOTDIR:
 926             case EACCES:
 927                 break;
 928             default:
 929                 fprintf (stderr, "\"%s\": ", dir);
 930                 perror ("");
 931                 ret++;
 932             }
 933             FcStrSetDestroy (subdirs);
 934             continue;
 935         }
 936         if (stat ((char *) dir, &statb) == -1)
 937         {
 938             fprintf (stderr, "\"%s\": ", dir);
 939             perror ("");
 940             FcStrSetDestroy (subdirs);
 941             ret++;
 942             continue;
 943         }
 944         if (!S_ISDIR (statb.st_mode))
 945         {
 946             fprintf (stderr, "\"%s\": not a directory, skipping\n", dir);
 947             FcStrSetDestroy (subdirs);
 948             continue;
 949         }
 950         if (FcDirCacheValid (dir) &&
 951             FcDirCacheHasCurrentArch (dir) &&
 952             FcDirCacheRead (set, subdirs, dir, config))
 953         {
 954             /* if an old entry is found in the global cache, disable it */
 955             if ((d = FcGlobalCacheDirFind (cache, (const char *)dir)) != NULL)
 956             {
 957                 d->state = FcGCDirDisabled;
 958                 /* save the updated config later without this entry */
 959                 cache->updated = FcTrue;
 960             }
 961         }
 962         else
 963         {
 964             if (FcDebug () & FC_DBG_FONTSET)
 965                 printf ("cache scan dir %s\n", dir);
 966
 967             FcDirScanConfig (set, subdirs, cache,
 968                              config->blanks, dir, FcFalse, config);
 969         }
 970         sublist = FcStrListCreate (subdirs);
 971         FcStrSetDestroy (subdirs);
 972         if (!sublist)
 973         {
 974             fprintf (stderr, "Can't create subdir list in \"%s\"\n", dir);
 975             ret++;
 976             continue;
 977         }
 978         ret += FcCacheReadDirs (config, cache, sublist, set, processed_dirs);
 979     }
 980     FcStrListDone (list);
 981     return ret;
 982 }
 983
 984 FcFontSet *
 985 FcCacheRead (FcConfig *config, FcGlobalCache * cache)
 986 {
 987     FcFontSet   *s = FcFontSetCreate();
 988     FcStrSet    *processed_dirs;
 989
 990     if (!s)
 991         return 0;
 992
 993     processed_dirs = FcStrSetCreate();
 994     if (!processed_dirs)
 995         goto bail;
 996
 997     if (FcCacheReadDirs (config, cache, FcConfigGetConfigDirs (config), s, processed_dirs))
 998         goto bail1;
 999
1000     FcStrSetDestroy (processed_dirs);
1001     return s;
1002
1003  bail1:
1004     FcStrSetDestroy (processed_dirs);
1005  bail:
1006     FcFontSetDestroy (s);
1007     return 0;
1008 }
1009
1010 static const char bin2hex[] = { '0', '1', '2', '3',
1011                                 '4', '5', '6', '7',
1012                                 '8', '9', 'a', 'b',
1013                                 'c', 'd', 'e', 'f' };
1014
1015 static char *
1016 FcDirCacheHashName (const FcChar8 * dir, int collisions)
1017 {
1018     unsigned char       hash[16], hex_hash[33];
1019     char                *cache_hashed;
1020     unsigned char       uscore = '_';
1021     int                 cnt, i;
1022     FcChar8             *tmp;
1023     struct MD5Context   ctx;
1024
1025     MD5Init (&ctx);
1026     MD5Update (&ctx, (unsigned char *)dir, strlen ((char *) dir));
1027
1028     for (i = 0; i < collisions; i++)
1029         MD5Update (&ctx, &uscore, 1);
1030
1031     MD5Final (hash, &ctx);
1032
1033     for (cnt = 0; cnt < 16; ++cnt)
1034     {
1035         hex_hash[2*cnt] = bin2hex[hash[cnt] >> 4];
1036         hex_hash[2*cnt+1] = bin2hex[hash[cnt] & 0xf];
1037     }
1038     hex_hash[32] = 0;
1039
1040     tmp = FcStrPlus ((FcChar8 *)hex_hash, (FcChar8 *)FC_CACHE_SUFFIX);
1041     if (!tmp)
1042         return 0;
1043
1044     cache_hashed = (char *)FcStrPlus ((FcChar8 *)PKGCACHEDIR"/", tmp);
1045     free (tmp);
1046
1047     return cache_hashed;
1048 }
1049
1050 /* Opens the hashed name for cache_file.
1051  * This would fail in the unlikely event of a collision and subsequent
1052  * removal of the file which originally caused the collision. */
1053 static int
1054 FcDirCacheOpen (const FcChar8 *dir)
1055 {
1056     FcBool      found;
1057     int         fd = -1, collisions = 0;
1058     char        *cache_hashed;
1059     char        dir_buf[FC_MAX_FILE_LEN];
1060     struct stat dir_stat;
1061
1062     if (stat ((char *)dir, &dir_stat) == -1)
1063         return -1;
1064
1065     found = FcFalse;
1066     do
1067     {
1068         struct stat     c;
1069
1070         if (fd >= 0)
1071             close (fd);
1072
1073         cache_hashed = FcDirCacheHashName (dir, collisions++);
1074         if (!cache_hashed)
1075             return -1;
1076
1077         fd = open(cache_hashed, O_RDONLY | O_BINARY);
1078         FcStrFree ((FcChar8 *)cache_hashed);
1079
1080         if (fd == -1)
1081             break;
1082         if (!FcCacheReadString (fd, dir_buf, sizeof (dir_buf)) ||
1083             !strlen(dir_buf))
1084             break;
1085
1086         if (stat ((char *)dir_buf, &c) == -1)
1087             continue;
1088
1089         found = (c.st_ino == dir_stat.st_ino) && (c.st_dev == dir_stat.st_dev);
1090     } while (!found);
1091
1092     return fd;
1093 }
1094
1095 /* read serialized state from the cache file */
1096 FcBool
1097 FcDirCacheRead (FcFontSet * set, FcStrSet * dirs, const FcChar8 *dir, FcConfig *config)
1098 {
1099     int         fd;
1100     char        *current_arch_machine_name;
1101     char        candidate_arch_machine_name[9+MACHINE_SIGNATURE_SIZE];
1102     off_t       current_arch_start = 0;
1103     char        subdirName[FC_MAX_FILE_LEN + 1 + 12 + 1];
1104
1105     fd = FcDirCacheOpen (dir);
1106     if (fd < 0)
1107         goto bail;
1108
1109     current_arch_machine_name = FcCacheMachineSignature();
1110     current_arch_start = FcCacheSkipToArch(fd,
1111                                            current_arch_machine_name);
1112     if (current_arch_start < 0)
1113         goto bail1;
1114
1115     lseek (fd, current_arch_start, SEEK_SET);
1116     if (FcCacheReadString (fd, candidate_arch_machine_name,
1117                            sizeof (candidate_arch_machine_name)) == 0)
1118         goto bail1;
1119
1120     while (FcCacheReadString (fd, subdirName, sizeof (subdirName)) && strlen (subdirName) > 0)
1121         FcStrSetAdd (dirs, (FcChar8 *)subdirName);
1122
1123     if (!FcDirCacheConsume (fd, (const char *)dir, set, config))
1124         goto bail1;
1125
1126     close(fd);
1127     return FcTrue;
1128
1129  bail1:
1130     close (fd);
1131  bail:
1132     return FcFalse;
1133 }
1134
1135 static FcBool
1136 FcDirCacheConsume (int fd, const char * dir, FcFontSet *set, FcConfig *config)
1137 {
1138     FcCache metadata;
1139     void * current_dir_block;
1140     off_t pos, endpos;
1141
1142     if (read(fd, &metadata, sizeof(FcCache)) != sizeof(FcCache))
1143         return FcFalse;
1144     if (metadata.magic != FC_CACHE_MAGIC)
1145         return FcFalse;
1146
1147     if (!metadata.count)
1148     {
1149         pos = FcCacheNextOffset (lseek(fd, 0, SEEK_CUR));
1150         lseek (fd, pos, SEEK_SET);
1151         if (config)
1152             FcConfigAddFontDir (config, (FcChar8 *)dir);
1153         return FcTrue;
1154     }
1155
1156     pos = FcCacheNextOffset (lseek(fd, 0, SEEK_CUR));
1157
1158     /* This is not failsafe (multi-arches can break it),
1159      * but fd has got to have at least as many bytes as
1160      * metadata.count, or something's going to go horribly wrong. */
1161     if (pos == (off_t)-1)
1162         return FcFalse;
1163
1164     endpos = lseek (fd, 0, SEEK_END);
1165     if (endpos == (off_t)-1 || endpos - pos < metadata.count)
1166         return FcFalse;
1167     if (lseek (fd, pos, SEEK_SET) == -1)
1168         return FcFalse;
1169
1170 #if defined(HAVE_MMAP) || defined(__CYGWIN__)
1171     current_dir_block = mmap (0, metadata.count,
1172                               PROT_READ, MAP_SHARED, fd, pos);
1173     if (current_dir_block == MAP_FAILED)
1174         return FcFalse;
1175 #elif defined(_WIN32)
1176         {
1177                 HANDLE hFileMap;
1178
1179                 hFileMap = CreateFileMapping((HANDLE) _get_osfhandle(fd), NULL, PAGE_READONLY, 0, 0, NULL);
1180                 if (hFileMap == NULL)
1181                         return FcFalse;
1182
1183                 current_dir_block = MapViewOfFile (hFileMap, FILE_MAP_READ, 0, 0, metadata.count + pos);
1184                 if (current_dir_block == NULL)
1185                 {
1186                         CloseHandle (hFileMap);
1187                         return FcFalse;
1188                 }
1189
1190                 current_dir_block = (void *)((char *)current_dir_block + pos);
1191         }
1192 #else
1193     current_dir_block = malloc (metadata.count);
1194     if (!current_dir_block)
1195         return FcFalse;
1196
1197     /* could also use CreateMappedViewOfFile under MinGW... */
1198     if (read (fd, current_dir_block, metadata.count) != metadata.count)
1199         goto bail;
1200 #endif
1201     lseek (fd, pos+metadata.count, SEEK_SET);
1202
1203     FcCacheAddBankDir (metadata.bank, dir);
1204     if (config)
1205         FcConfigAddFontDir (config, (FcChar8 *)dir);
1206
1207     if (!FcFontSetUnserialize (&metadata, set, current_dir_block))
1208         goto bail;
1209
1210     return FcTrue;
1211  bail:
1212 #if !(defined(HAVE_MMAP) || defined(__CYGWIN__))
1213     free (current_dir_block);
1214 #endif
1215     return FcFalse;
1216 }
1217
1218 static void *
1219 FcDirCacheProduce (FcFontSet *set, FcCache *metadata)
1220 {
1221     void * current_dir_block, * final_dir_block;
1222     static unsigned int rand_state = 0;
1223     int bank, needed_bytes_no_align;
1224
1225 #if defined (HAVE_RAND_R)
1226     if (!rand_state)
1227         rand_state = time(0L);
1228     bank = rand_r(&rand_state);
1229
1230     while (FcCacheHaveBank(bank))
1231         bank = rand_r(&rand_state);
1232 #else
1233     if (!rand_state)
1234     {
1235         rand_state = 1;
1236         srand (time (0L));
1237     }
1238     bank = rand();
1239
1240     while (FcCacheHaveBank(bank))
1241         bank = rand();
1242 #endif
1243
1244     memset (metadata, 0, sizeof(FcCache));
1245     FcFontSetNewBank();
1246     needed_bytes_no_align = FcFontSetNeededBytes (set);
1247     metadata->count = needed_bytes_no_align +
1248         FcFontSetNeededBytesAlign ();
1249     metadata->magic = FC_CACHE_MAGIC;
1250     metadata->bank = bank;
1251
1252     if (!needed_bytes_no_align) /* not a failure, no fonts to write */
1253     {
1254         /* no, you don't really need to write any bytes at all. */
1255         metadata->count = 0;
1256         return 0;
1257     }
1258
1259     current_dir_block = malloc (metadata->count);
1260     if (!current_dir_block)
1261         goto bail;
1262     /* shut up valgrind */
1263     memset (current_dir_block, 0, metadata->count);
1264     final_dir_block = FcFontSetDistributeBytes (metadata, current_dir_block);
1265
1266     if ((void *)((char *)current_dir_block+metadata->count) < final_dir_block)
1267         goto bail;
1268
1269     if (!FcFontSetSerialize (bank, set))
1270         goto bail;
1271
1272     return current_dir_block;
1273
1274  bail:
1275     free (current_dir_block);
1276     return 0;
1277 }
1278
1279 /* write serialized state to the cache file */
1280 FcBool
1281 FcDirCacheWrite (FcFontSet *set, FcStrSet *dirs, const FcChar8 *dir)
1282 {
1283     char            *cache_hashed;
1284     int             fd, fd_orig, i, dirs_count;
1285     FcAtomic        *atomic;
1286     FcCache         metadata;
1287     off_t           current_arch_start = 0, truncate_to;
1288     char            dir_buf[FC_MAX_FILE_LEN];
1289     int             collisions;
1290
1291     char            *current_arch_machine_name, * header;
1292     void            *current_dir_block = 0;
1293
1294     dir = FcConfigNormalizeFontDir (FcConfigGetCurrent(), dir);
1295     if (!dir)
1296         return FcFalse;
1297
1298     /* Ensure that we're not trampling a cache for some other dir. */
1299     /* This is slightly different from FcDirCacheOpen, since it
1300      * needs the filename, not the file descriptor. */
1301     fd = -1; collisions = 0;
1302     do
1303     {
1304         cache_hashed = FcDirCacheHashName (dir, collisions++);
1305         if (!cache_hashed)
1306             goto bail0;
1307
1308         if (fd > 0)
1309             close (fd);
1310         fd = open(cache_hashed, O_RDONLY | O_BINARY);
1311         if (fd == -1)
1312             break;
1313         if(!FcCacheReadString (fd, dir_buf, sizeof (dir_buf)) || !strlen(dir_buf))
1314         {
1315             close (fd);
1316             FcStrFree ((FcChar8 *)cache_hashed);
1317             continue;
1318         }
1319         close (fd);
1320
1321         if (strcmp (dir_buf, (char *) dir) != 0)
1322         {
1323             FcStrFree ((FcChar8 *)cache_hashed);
1324             continue;
1325         }
1326
1327         break;
1328     } while (1);
1329
1330     current_dir_block = FcDirCacheProduce (set, &metadata);
1331
1332     if (metadata.count && !current_dir_block)
1333         goto bail1;
1334
1335     if (FcDebug () & FC_DBG_CACHE)
1336         printf ("FcDirCacheWriteDir dir \"%s\" file \"%s\"\n",
1337                 dir, cache_hashed);
1338
1339     atomic = FcAtomicCreate ((FcChar8 *)cache_hashed);
1340     if (!atomic)
1341         goto bail1;
1342
1343     if (!FcAtomicLock (atomic))
1344         goto bail2;
1345
1346     /* open the original file to save relevant portions */
1347     fd_orig = open((char *)FcAtomicOrigFile (atomic), O_RDONLY | O_BINARY);
1348
1349     fd = open((char *)FcAtomicNewFile (atomic), O_RDWR | O_CREAT | O_BINARY, 0666);
1350     if (fd == -1)
1351         goto bail3;
1352
1353     FcCacheWriteString (fd, (char *) dir);
1354
1355     current_arch_machine_name = FcCacheMachineSignature ();
1356     current_arch_start = 0;
1357
1358     if (fd_orig != -1)
1359         current_arch_start =
1360             FcCacheSkipToArch(fd_orig, current_arch_machine_name);
1361
1362     if (current_arch_start < 0)
1363     {
1364         off_t offset = lseek(fd_orig, 0, SEEK_END);
1365         current_arch_start = FcCacheNextOffset (offset);
1366     }
1367
1368     if (fd_orig != -1 && !FcCacheCopyOld(fd, fd_orig, current_arch_start))
1369         goto bail4;
1370
1371     if (fd_orig != -1)
1372         close (fd_orig);
1373
1374     current_arch_start = lseek(fd, 0, SEEK_CUR);
1375 #if defined (HAVE_FTRUNCATE)
1376     if (ftruncate (fd, current_arch_start) == -1)
1377         goto bail4;
1378 #else
1379 #if defined (HAVE_CHSIZE)
1380     if (chsize (fd, current_arch_start) == -1)
1381         goto bail4;
1382 #else
1383     goto bail4;
1384 #endif
1385 #endif
1386
1387     /* allocate space for subdir names in this block */
1388     dirs_count = 0;
1389     for (i = 0; i < dirs->size; i++)
1390         dirs_count += strlen((char *)dirs->strs[i]) + 1;
1391     dirs_count ++;
1392
1393     /* now write the address of the next offset */
1394     truncate_to = FcCacheNextOffset (FcCacheNextOffset (current_arch_start + sizeof (FcCache) + dirs_count) + metadata.count) - current_arch_start;
1395     header = malloc (10 + strlen (current_arch_machine_name));
1396     if (!header)
1397         goto bail4;
1398     sprintf (header, "%8x ", (int)truncate_to);
1399     strcat (header, current_arch_machine_name);
1400     if (!FcCacheWriteString (fd, header))
1401         goto bail5;
1402
1403     for (i = 0; i < dirs->size; i++)
1404         FcCacheWriteString (fd, (char *)dirs->strs[i]);
1405     FcCacheWriteString (fd, "");
1406
1407     if (write (fd, &metadata, sizeof(FcCache)) != sizeof(FcCache))
1408     {
1409         perror("write metadata");
1410         goto bail5;
1411     }
1412     if (metadata.count)
1413     {
1414         off_t off = FcCacheNextOffset (lseek(fd, 0, SEEK_END));
1415         if (lseek (fd, off, SEEK_SET) != off)
1416             perror("lseek");
1417         else if (write (fd, current_dir_block, metadata.count) !=
1418                  metadata.count)
1419             perror("write current_dir_block");
1420         free (current_dir_block);
1421         current_dir_block = 0;
1422     }
1423
1424     /* this actually serves to pad out the cache file, if needed */
1425 #if defined (HAVE_FTRUNCATE)
1426     if (ftruncate (fd, current_arch_start + truncate_to) == -1)
1427         goto bail5;
1428 #else
1429 #if defined (HAVE_CHSIZE)
1430     if (chsize (fd, current_arch_start + truncate_to) == -1)
1431         goto bail5;
1432 #else
1433     goto bail5;
1434 #endif
1435 #endif
1436
1437     free (header);
1438     close(fd);
1439     if (!FcAtomicReplaceOrig(atomic))
1440         goto bail3;
1441     FcStrFree ((FcChar8 *)cache_hashed);
1442     FcAtomicUnlock (atomic);
1443     FcAtomicDestroy (atomic);
1444     return FcTrue;
1445
1446  bail5:
1447     free (header);
1448  bail4:
1449     close (fd);
1450  bail3:
1451     FcAtomicUnlock (atomic);
1452  bail2:
1453     FcAtomicDestroy (atomic);
1454  bail1:
1455     FcStrFree ((FcChar8 *)cache_hashed);
1456  bail0:
1457     if (current_dir_block)
1458         free (current_dir_block);
1459     return FcFalse;
1460 }
1461
1462 static char *
1463 FcCacheMachineSignature ()
1464 {
1465     static char buf[MACHINE_SIGNATURE_SIZE];
1466     int32_t magic = ENDIAN_TEST;
1467     char * m = (char *)&magic;
1468
1469     sprintf (buf, "%2x%2x%2x%2x "
1470              "%4x %4x %4x %4x %4x %4x %4x %4x %4x %4x %4x %4x "
1471              "%4x %4x %4x %4x %4x %4x %4x %4x\n",
1472              m[0], m[1], m[2], m[3],
1473              (unsigned int)sizeof (char),
1474              (unsigned int)sizeof (char *),
1475              (unsigned int)sizeof (int),
1476              (unsigned int)sizeof (FcPattern),
1477              (unsigned int)sizeof (FcPatternEltPtr),
1478              (unsigned int)sizeof (struct _FcPatternElt *),
1479              (unsigned int)sizeof (FcPatternElt),
1480              (unsigned int)sizeof (FcObjectPtr),
1481              (unsigned int)sizeof (FcValueListPtr),
1482              (unsigned int)sizeof (FcValue),
1483              (unsigned int)sizeof (FcValueBinding),
1484              (unsigned int)sizeof (struct _FcValueList *),
1485              (unsigned int)sizeof (FcCharSet),
1486              (unsigned int)sizeof (FcCharLeaf **),
1487              (unsigned int)sizeof (FcChar16 *),
1488              (unsigned int)sizeof (FcChar16),
1489              (unsigned int)sizeof (FcCharLeaf),
1490              (unsigned int)sizeof (FcChar32),
1491              (unsigned int)sizeof (FcCache),
1492 #if defined (HAVE_SYSCONF)
1493              (unsigned int)sysconf(_SC_PAGESIZE));
1494 #else
1495              (unsigned int)FC_HARDCODED_PAGESIZE);
1496 #endif
1497
1498     return buf;
1499 }
1500
1501 static int banks_ptr = 0, banks_alloc = 0;
1502 int * _fcBankId = 0, * _fcBankIdx = 0;
1503 static const char ** bankDirs = 0;
1504
1505 static FcBool
1506 FcCacheHaveBank (int bank)
1507 {
1508     int i;
1509
1510     if (bank < FC_BANK_FIRST)
1511         return FcTrue;
1512
1513     for (i = 0; i < banks_ptr; i++)
1514         if (_fcBankId[i] == bank)
1515             return FcTrue;
1516
1517     return FcFalse;
1518 }
1519
1520 int
1521 FcCacheBankToIndexMTF (int bank)
1522 {
1523     int i, j;
1524
1525     for (i = 0; i < banks_ptr; i++)
1526         if (_fcBankId[_fcBankIdx[i]] == bank)
1527         {
1528             int t = _fcBankIdx[i];
1529
1530             for (j = i; j > 0; j--)
1531                 _fcBankIdx[j] = _fcBankIdx[j-1];
1532             _fcBankIdx[0] = t;
1533             return t;
1534         }
1535
1536     if (banks_ptr >= banks_alloc)
1537     {
1538         int * b, * bidx;
1539         const char ** bds;
1540
1541         b = realloc (_fcBankId, (banks_alloc + 4) * sizeof(int));
1542         if (!b)
1543             return -1;
1544         _fcBankId = b;
1545
1546         bidx = realloc (_fcBankIdx, (banks_alloc + 4) * sizeof(int));
1547         if (!bidx)
1548             return -1;
1549         _fcBankIdx = bidx;
1550
1551         bds = realloc (bankDirs, (banks_alloc + 4) * sizeof (char *));
1552         if (!bds)
1553             return -1;
1554         bankDirs = bds;
1555
1556         banks_alloc += 4;
1557     }
1558
1559     i = banks_ptr++;
1560     _fcBankId[i] = bank;
1561     _fcBankIdx[i] = i;
1562     return i;
1563 }
1564
1565 static void
1566 FcCacheAddBankDir (int bank, const char * dir)
1567 {
1568     int bi = FcCacheBankToIndexMTF (bank);
1569
1570     if (bi < 0)
1571         return;
1572
1573     bankDirs[bi] = (const char *)FcStrCopy ((FcChar8 *)dir);
1574 }
1575
1576 const char *
1577 FcCacheFindBankDir (int bank)
1578 {
1579     int bi = FcCacheBankToIndex (bank);
1580     return bankDirs[bi];
1581 }
1582
1583 /*
1584  * This code implements the MD5 message-digest algorithm.
1585  * The algorithm is due to Ron Rivest.  This code was
1586  * written by Colin Plumb in 1993, no copyright is claimed.
1587  * This code is in the public domain; do with it what you wish.
1588  *
1589  * Equivalent code is available from RSA Data Security, Inc.
1590  * This code has been tested against that, and is equivalent,
1591  * except that you don't need to include two pages of legalese
1592  * with every copy.
1593  *
1594  * To compute the message digest of a chunk of bytes, declare an
1595  * MD5Context structure, pass it to MD5Init, call MD5Update as
1596  * needed on buffers full of bytes, and then call MD5Final, which
1597  * will fill a supplied 16-byte array with the digest.
1598  */
1599
1600 #ifndef HIGHFIRST
1601 #define byteReverse(buf, len)   /* Nothing */
1602 #else
1603 /*
1604  * Note: this code is harmless on little-endian machines.
1605  */
1606 void byteReverse(unsigned char *buf, unsigned longs)
1607 {
1608     FcChar32 t;
1609     do {
1610         t = (FcChar32) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
1611             ((unsigned) buf[1] << 8 | buf[0]);
1612         *(FcChar32 *) buf = t;
1613         buf += 4;
1614     } while (--longs);
1615 }
1616 #endif
1617
1618 /*
1619  * Start MD5 accumulation.  Set bit count to 0 and buffer to mysterious
1620  * initialization constants.
1621  */
1622 static void MD5Init(struct MD5Context *ctx)
1623 {
1624     ctx->buf[0] = 0x67452301;
1625     ctx->buf[1] = 0xefcdab89;
1626     ctx->buf[2] = 0x98badcfe;
1627     ctx->buf[3] = 0x10325476;
1628
1629     ctx->bits[0] = 0;
1630     ctx->bits[1] = 0;
1631 }
1632
1633 /*
1634  * Update context to reflect the concatenation of another buffer full
1635  * of bytes.
1636  */
1637 static void MD5Update(struct MD5Context *ctx, unsigned char *buf, unsigned len)
1638 {
1639     FcChar32 t;
1640
1641     /* Update bitcount */
1642
1643     t = ctx->bits[0];
1644     if ((ctx->bits[0] = t + ((FcChar32) len << 3)) < t)
1645         ctx->bits[1]++;         /* Carry from low to high */
1646     ctx->bits[1] += len >> 29;
1647
1648     t = (t >> 3) & 0x3f;        /* Bytes already in shsInfo->data */
1649
1650     /* Handle any leading odd-sized chunks */
1651
1652     if (t) {
1653         unsigned char *p = (unsigned char *) ctx->in + t;
1654
1655         t = 64 - t;
1656         if (len < t) {
1657             memcpy(p, buf, len);
1658             return;
1659         }
1660         memcpy(p, buf, t);
1661         byteReverse(ctx->in, 16);
1662         MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
1663         buf += t;
1664         len -= t;
1665     }
1666     /* Process data in 64-byte chunks */
1667
1668     while (len >= 64) {
1669         memcpy(ctx->in, buf, 64);
1670         byteReverse(ctx->in, 16);
1671         MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
1672         buf += 64;
1673         len -= 64;
1674     }
1675
1676     /* Handle any remaining bytes of data. */
1677
1678     memcpy(ctx->in, buf, len);
1679 }
1680
1681 /*
1682  * Final wrapup - pad to 64-byte boundary with the bit pattern
1683  * 1 0* (64-bit count of bits processed, MSB-first)
1684  */
1685 static void MD5Final(unsigned char digest[16], struct MD5Context *ctx)
1686 {
1687     unsigned count;
1688     unsigned char *p;
1689
1690     /* Compute number of bytes mod 64 */
1691     count = (ctx->bits[0] >> 3) & 0x3F;
1692
1693     /* Set the first char of padding to 0x80.  This is safe since there is
1694        always at least one byte free */
1695     p = ctx->in + count;
1696     *p++ = 0x80;
1697
1698     /* Bytes of padding needed to make 64 bytes */
1699     count = 64 - 1 - count;
1700
1701     /* Pad out to 56 mod 64 */
1702     if (count < 8) {
1703         /* Two lots of padding:  Pad the first block to 64 bytes */
1704         memset(p, 0, count);
1705         byteReverse(ctx->in, 16);
1706         MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
1707
1708         /* Now fill the next block with 56 bytes */
1709         memset(ctx->in, 0, 56);
1710     } else {
1711         /* Pad block to 56 bytes */
1712         memset(p, 0, count - 8);
1713     }
1714     byteReverse(ctx->in, 14);
1715
1716     /* Append length in bits and transform */
1717     ((FcChar32 *) ctx->in)[14] = ctx->bits[0];
1718     ((FcChar32 *) ctx->in)[15] = ctx->bits[1];
1719
1720     MD5Transform(ctx->buf, (FcChar32 *) ctx->in);
1721     byteReverse((unsigned char *) ctx->buf, 4);
1722     memcpy(digest, ctx->buf, 16);
1723     memset(ctx, 0, sizeof(ctx));        /* In case it's sensitive */
1724 }
1725
1726
1727 /* The four core functions - F1 is optimized somewhat */
1728
1729 /* #define F1(x, y, z) (x & y | ~x & z) */
1730 #define F1(x, y, z) (z ^ (x & (y ^ z)))
1731 #define F2(x, y, z) F1(z, x, y)
1732 #define F3(x, y, z) (x ^ y ^ z)
1733 #define F4(x, y, z) (y ^ (x | ~z))
1734
1735 /* This is the central step in the MD5 algorithm. */
1736 #define MD5STEP(f, w, x, y, z, data, s) \
1737         ( w += f(x, y, z) + data,  w = w<<s | w>>(32-s),  w += x )
1738
1739 /*
1740  * The core of the MD5 algorithm, this alters an existing MD5 hash to
1741  * reflect the addition of 16 longwords of new data.  MD5Update blocks
1742  * the data and converts bytes into longwords for this routine.
1743  */
1744 static void MD5Transform(FcChar32 buf[4], FcChar32 in[16])
1745 {
1746     register FcChar32 a, b, c, d;
1747
1748     a = buf[0];
1749     b = buf[1];
1750     c = buf[2];
1751     d = buf[3];
1752
1753     MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
1754     MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
1755     MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
1756     MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
1757     MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
1758     MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
1759     MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
1760     MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
1761     MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
1762     MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
1763     MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
1764     MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
1765     MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
1766     MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
1767     MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
1768     MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
1769
1770     MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
1771     MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
1772     MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
1773     MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
1774     MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
1775     MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
1776     MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
1777     MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
1778     MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
1779     MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
1780     MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
1781     MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
1782     MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
1783     MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
1784     MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
1785     MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
1786
1787     MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
1788     MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
1789     MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
1790     MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
1791     MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
1792     MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
1793     MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
1794     MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
1795     MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
1796     MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
1797     MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
1798     MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
1799     MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
1800     MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
1801     MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
1802     MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
1803
1804     MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
1805     MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
1806     MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
1807     MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
1808     MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
1809     MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
1810     MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
1811     MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
1812     MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
1813     MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
1814     MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
1815     MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
1816     MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
1817     MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
1818     MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
1819     MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
1820
1821     buf[0] += a;
1822     buf[1] += b;
1823     buf[2] += c;
1824     buf[3] += d;
1825 }