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