src/fccache.c

   1 /*
   2  * $XFree86: xc/lib/fontconfig/src/fccache.c,v 1.11 2002/08/19 19:32:05 keithp Exp $
   3  *
   4  * Copyright © 2000 Keith Packard, member of The XFree86 Project, Inc.
   5  *
   6  * Permission to use, copy, modify, distribute, and sell this software and its
   7  * documentation for any purpose is hereby granted without fee, provided that
   8  * the above copyright notice appear in all copies and that both that
   9  * copyright notice and this permission notice appear in supporting
  10  * documentation, and that the name of Keith Packard not be used in
  11  * advertising or publicity pertaining to distribution of the software without
  12  * specific, written prior permission.  Keith Packard makes no
  13  * representations about the suitability of this software for any purpose.  It
  14  * is provided "as is" without express or implied warranty.
  15  *
  16  * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  17  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  18  * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  19  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  20  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  21  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  22  * PERFORMANCE OF THIS SOFTWARE.
  23  */
  24
  25 #include "fcint.h"
  26
  27 /*
  28  * POSIX has broken stdio so that getc must do thread-safe locking,
  29  * this is a serious performance problem for applications doing large
  30  * amounts of IO with getc (as is done here).  If available, use
  31  * the getc_unlocked varient instead.
  32  */
  33
  34 #if defined(getc_unlocked) || defined(_IO_getc_unlocked)
  35 #define GETC(f) getc_unlocked(f)
  36 #define PUTC(c,f) putc_unlocked(c,f)
  37 #else
  38 #define GETC(f) getc(f)
  39 #define PUTC(c,f) putc(c,f)
  40 #endif
  41
  42 #define FC_DBG_CACHE_REF    1024
  43
  44 static FcChar8 *
  45 FcCacheReadString (FILE *f, FcChar8 *dest, int len)
  46 {
  47     int         c;
  48     FcBool      escape;
  49     FcChar8     *d;
  50     int         size;
  51     int         i;
  52
  53     while ((c = GETC (f)) != EOF)
  54         if (c == '"')
  55             break;
  56     if (c == EOF)
  57         return FcFalse;
  58     if (len == 0)
  59         return FcFalse;
  60
  61     size = len;
  62     i = 0;
  63     d = dest;
  64     escape = FcFalse;
  65     while ((c = GETC (f)) != EOF)
  66     {
  67         if (!escape)
  68         {
  69             switch (c) {
  70             case '"':
  71                 c = '\0';
  72                 break;
  73             case '\\':
  74                 escape = FcTrue;
  75                 continue;
  76             }
  77         }
  78         if (i == size)
  79         {
  80             FcChar8 *new = malloc (size * 2);
  81             if (!new)
  82                 break;
  83             memcpy (new, d, size);
  84             size *= 2;
  85             if (d != dest)
  86                 free (d);
  87             d = new;
  88         }
  89         d[i++] = c;
  90         if (c == '\0')
  91             return d;
  92         escape = FcFalse;
  93     }
  94     if (d != dest)
  95         free (d);
  96     return 0;
  97 }
  98
  99 static FcBool
 100 FcCacheReadUlong (FILE *f, unsigned long *dest)
 101 {
 102     unsigned long   t;
 103     int             c;
 104
 105     while ((c = GETC (f)) != EOF)
 106     {
 107         if (!isspace (c))
 108             break;
 109     }
 110     if (c == EOF)
 111         return FcFalse;
 112     t = 0;
 113     for (;;)
 114     {
 115         if (c == EOF || isspace (c))
 116             break;
 117         if (!isdigit (c))
 118             return FcFalse;
 119         t = t * 10 + (c - '0');
 120         c = GETC (f);
 121     }
 122     *dest = t;
 123     return FcTrue;
 124 }
 125
 126 static FcBool
 127 FcCacheReadInt (FILE *f, int *dest)
 128 {
 129     unsigned long   t;
 130     FcBool          ret;
 131
 132     ret = FcCacheReadUlong (f, &t);
 133     if (ret)
 134         *dest = (int) t;
 135     return ret;
 136 }
 137
 138 static FcBool
 139 FcCacheReadTime (FILE *f, time_t *dest)
 140 {
 141     unsigned long   t;
 142     FcBool          ret;
 143
 144     ret = FcCacheReadUlong (f, &t);
 145     if (ret)
 146         *dest = (time_t) t;
 147     return ret;
 148 }
 149
 150 static FcBool
 151 FcCacheWriteChars (FILE *f, const FcChar8 *chars)
 152 {
 153     FcChar8    c;
 154     while ((c = *chars++))
 155     {
 156         switch (c) {
 157         case '"':
 158         case '\\':
 159             if (PUTC ('\\', f) == EOF)
 160                 return FcFalse;
 161             /* fall through */
 162         default:
 163             if (PUTC (c, f) == EOF)
 164                 return FcFalse;
 165         }
 166     }
 167     return FcTrue;
 168 }
 169
 170 static FcBool
 171 FcCacheWriteString (FILE *f, const FcChar8 *string)
 172 {
 173
 174     if (PUTC ('"', f) == EOF)
 175         return FcFalse;
 176     if (!FcCacheWriteChars (f, string))
 177         return FcFalse;
 178     if (PUTC ('"', f) == EOF)
 179         return FcFalse;
 180     return FcTrue;
 181 }
 182
 183 static FcBool
 184 FcCacheWritePath (FILE *f, const FcChar8 *dir, const FcChar8 *file)
 185 {
 186     if (PUTC ('"', f) == EOF)
 187         return FcFalse;
 188     if (dir)
 189         if (!FcCacheWriteChars (f, dir))
 190             return FcFalse;
 191     if (dir && dir[strlen((const char *) dir) - 1] != '/')
 192         if (PUTC ('/', f) == EOF)
 193             return FcFalse;
 194     if (!FcCacheWriteChars (f, file))
 195         return FcFalse;
 196     if (PUTC ('"', f) == EOF)
 197         return FcFalse;
 198     return FcTrue;
 199 }
 200
 201 static FcBool
 202 FcCacheWriteUlong (FILE *f, unsigned long t)
 203 {
 204     int     pow;
 205     unsigned long   temp, digit;
 206
 207     temp = t;
 208     pow = 1;
 209     while (temp >= 10)
 210     {
 211         temp /= 10;
 212         pow *= 10;
 213     }
 214     temp = t;
 215     while (pow)
 216     {
 217         digit = temp / pow;
 218         if (PUTC ((char) digit + '0', f) == EOF)
 219             return FcFalse;
 220         temp = temp - pow * digit;
 221         pow = pow / 10;
 222     }
 223     return FcTrue;
 224 }
 225
 226 static FcBool
 227 FcCacheWriteInt (FILE *f, int i)
 228 {
 229     return FcCacheWriteUlong (f, (unsigned long) i);
 230 }
 231
 232 static FcBool
 233 FcCacheWriteTime (FILE *f, time_t t)
 234 {
 235     return FcCacheWriteUlong (f, (unsigned long) t);
 236 }
 237
 238 static FcBool
 239 FcCacheFontSetAdd (FcFontSet        *set,
 240                    FcStrSet         *dirs,
 241                    const FcChar8    *dir,
 242                    int              dir_len,
 243                    const FcChar8    *file,
 244                    const FcChar8    *name)
 245 {
 246     FcChar8     path_buf[8192], *path;
 247     int         len;
 248     FcBool      ret = FcFalse;
 249     FcPattern   *font;
 250     FcPattern   *frozen;
 251
 252     path = path_buf;
 253     len = (dir_len + 1 + strlen ((const char *) file) + 1);
 254     if (len > sizeof (path_buf))
 255     {
 256         path = malloc (len);
 257         if (!path)
 258             return FcFalse;
 259     }
 260     strncpy ((char *) path, (const char *) dir, dir_len);
 261     if (dir[dir_len - 1] != '/')
 262         path[dir_len++] = '/';
 263     strcpy ((char *) path + dir_len, (const char *) file);
 264     if (!FcStrCmp (name, FC_FONT_FILE_DIR))
 265     {
 266         if (FcDebug () & FC_DBG_CACHEV)
 267             printf (" dir cache dir \"%s\"\n", path);
 268         ret = FcStrSetAdd (dirs, path);
 269     }
 270     else if (!FcStrCmp (name, FC_FONT_FILE_INVALID))
 271     {
 272         ret = FcTrue;
 273     }
 274     else
 275     {
 276         font = FcNameParse (name);
 277         if (font)
 278         {
 279             if (FcDebug () & FC_DBG_CACHEV)
 280                 printf (" dir cache file \"%s\"\n", file);
 281             ret = FcPatternAddString (font, FC_FILE, path);
 282             if (ret)
 283             {
 284                 frozen = FcPatternFreeze (font);
 285                 ret = (frozen != 0);
 286                 if (ret)
 287                    ret = FcFontSetAdd (set, frozen);
 288             }
 289             FcPatternDestroy (font);
 290         }
 291     }
 292     if (path != path_buf) free (path);
 293     return ret;
 294
 295 }
 296
 297 static unsigned int
 298 FcCacheHash (const FcChar8 *string)
 299 {
 300     unsigned int    h = 0;
 301     FcChar8         c;
 302
 303     while ((c = *string++))
 304         h = (h << 1) ^ c;
 305     return 0;
 306 }
 307
 308 /*
 309  * Verify the saved timestamp for a file
 310  */
 311 FcBool
 312 FcGlobalCacheCheckTime (FcGlobalCacheInfo *info)
 313 {
 314     struct stat     statb;
 315
 316     if (stat ((char *) info->file, &statb) < 0)
 317     {
 318         if (FcDebug () & FC_DBG_CACHE)
 319             printf (" file missing\n");
 320         return FcFalse;
 321     }
 322     if (statb.st_mtime != info->time)
 323     {
 324         if (FcDebug () & FC_DBG_CACHE)
 325             printf (" timestamp mismatch (was %d is %d)\n",
 326                     (int) info->time, (int) statb.st_mtime);
 327         return FcFalse;
 328     }
 329     return FcTrue;
 330 }
 331
 332 void
 333 FcGlobalCacheReferenced (FcGlobalCache      *cache,
 334                          FcGlobalCacheInfo  *info)
 335 {
 336     if (!info->referenced)
 337     {
 338         info->referenced = FcTrue;
 339         cache->referenced++;
 340         if (FcDebug () & FC_DBG_CACHE_REF)
 341             printf ("Reference %d %s\n", cache->referenced, info->file);
 342     }
 343 }
 344
 345 /*
 346  * Break a path into dir/base elements and compute the base hash
 347  * and the dir length.  This is shared between the functions
 348  * which walk the file caches
 349  */
 350
 351 typedef struct _FcFilePathInfo {
 352     const FcChar8   *dir;
 353     int             dir_len;
 354     const FcChar8   *base;
 355     unsigned int    base_hash;
 356 } FcFilePathInfo;
 357
 358 static FcFilePathInfo
 359 FcFilePathInfoGet (const FcChar8    *path)
 360 {
 361     FcFilePathInfo  i;
 362     FcChar8         *slash;
 363
 364     slash = (FcChar8 *) strrchr ((const char *) path, '/');
 365     if (slash)
 366     {
 367         i.dir = path;
 368         i.dir_len = slash - path;
 369         if (!i.dir_len)
 370             i.dir_len = 1;
 371         i.base = slash + 1;
 372     }
 373     else
 374     {
 375         i.dir = (const FcChar8 *) ".";
 376         i.dir_len = 1;
 377         i.base = path;
 378     }
 379     i.base_hash = FcCacheHash (i.base);
 380     return i;
 381 }
 382
 383 FcGlobalCacheDir *
 384 FcGlobalCacheDirGet (FcGlobalCache  *cache,
 385                      const FcChar8  *dir,
 386                      int            len,
 387                      FcBool         create_missing)
 388 {
 389     unsigned int        hash = FcCacheHash (dir);
 390     FcGlobalCacheDir    *d, **prev;
 391
 392     for (prev = &cache->ents[hash % FC_GLOBAL_CACHE_DIR_HASH_SIZE];
 393          (d = *prev);
 394          prev = &(*prev)->next)
 395     {
 396         if (d->info.hash == hash && d->len == len &&
 397             !strncmp ((const char *) d->info.file,
 398                       (const char *) dir, len))
 399             break;
 400     }
 401     if (!(d = *prev))
 402     {
 403         int     i;
 404         if (!create_missing)
 405             return 0;
 406         d = malloc (sizeof (FcGlobalCacheDir) + len + 1);
 407         if (!d)
 408             return 0;
 409         d->next = *prev;
 410         *prev = d;
 411         d->info.hash = hash;
 412         d->info.file = (FcChar8 *) (d + 1);
 413         strncpy ((char *) d->info.file, (const char *) dir, len);
 414         d->info.file[len] = '\0';
 415         d->info.time = 0;
 416         d->info.referenced = FcFalse;
 417         d->len = len;
 418         for (i = 0; i < FC_GLOBAL_CACHE_FILE_HASH_SIZE; i++)
 419             d->ents[i] = 0;
 420         d->subdirs = 0;
 421     }
 422     return d;
 423 }
 424
 425 static FcGlobalCacheInfo *
 426 FcGlobalCacheDirAdd (FcGlobalCache  *cache,
 427                      const FcChar8  *dir,
 428                      time_t         time,
 429                      FcBool         replace)
 430 {
 431     FcGlobalCacheDir    *d;
 432     FcFilePathInfo      i;
 433     FcGlobalCacheSubdir *subdir;
 434     FcGlobalCacheDir    *parent;
 435
 436     /*
 437      * Add this directory to the cache
 438      */
 439     d = FcGlobalCacheDirGet (cache, dir, strlen ((const char *) dir), FcTrue);
 440     if (!d)
 441         return 0;
 442     d->info.time = time;
 443     i = FcFilePathInfoGet (dir);
 444     /*
 445      * Add this directory to the subdirectory list of the parent
 446      */
 447     parent = FcGlobalCacheDirGet (cache, i.dir, i.dir_len, FcTrue);
 448     if (!parent)
 449         return 0;
 450     subdir = malloc (sizeof (FcGlobalCacheSubdir) +
 451                      strlen ((const char *) i.base) + 1);
 452     if (!subdir)
 453         return 0;
 454     subdir->file = (FcChar8 *) (subdir + 1);
 455     strcpy ((char *) subdir->file, (const char *) i.base);
 456     subdir->next = parent->subdirs;
 457     parent->subdirs = subdir;
 458     return &d->info;
 459 }
 460
 461 static void
 462 FcGlobalCacheDirDestroy (FcGlobalCacheDir *d)
 463 {
 464     FcGlobalCacheFile   *f, *next;
 465     int                 h;
 466     FcGlobalCacheSubdir *s, *nexts;
 467
 468     for (h = 0; h < FC_GLOBAL_CACHE_FILE_HASH_SIZE; h++)
 469         for (f = d->ents[h]; f; f = next)
 470         {
 471             next = f->next;
 472             free (f);
 473         }
 474     for (s = d->subdirs; s; s = nexts)
 475     {
 476         nexts = s->next;
 477         free (s);
 478     }
 479     free (d);
 480 }
 481
 482 FcBool
 483 FcGlobalCacheScanDir (FcFontSet         *set,
 484                       FcStrSet          *dirs,
 485                       FcGlobalCache     *cache,
 486                       const FcChar8     *dir)
 487 {
 488     FcGlobalCacheDir    *d = FcGlobalCacheDirGet (cache, dir,
 489                                                   strlen ((const char *) dir),
 490                                                   FcFalse);
 491     FcGlobalCacheFile   *f;
 492     int                 h;
 493     int                 dir_len;
 494     FcGlobalCacheSubdir *subdir;
 495
 496     if (FcDebug() & FC_DBG_CACHE)
 497         printf ("FcGlobalCacheScanDir %s\n", dir);
 498
 499     if (!d)
 500     {
 501         if (FcDebug () & FC_DBG_CACHE)
 502             printf ("\tNo dir cache entry\n");
 503         return FcFalse;
 504     }
 505
 506     if (!FcGlobalCacheCheckTime (&d->info))
 507     {
 508         if (FcDebug () & FC_DBG_CACHE)
 509             printf ("\tdir cache entry time mismatch\n");
 510         return FcFalse;
 511     }
 512
 513     dir_len = strlen ((const char *) dir);
 514     for (h = 0; h < FC_GLOBAL_CACHE_FILE_HASH_SIZE; h++)
 515         for (f = d->ents[h]; f; f = f->next)
 516         {
 517             if (FcDebug() & FC_DBG_CACHEV)
 518                 printf ("FcGlobalCacheScanDir add file %s\n", f->info.file);
 519             if (!FcCacheFontSetAdd (set, dirs, dir, dir_len,
 520                                     f->info.file, f->name))
 521             {
 522                 cache->broken = FcTrue;
 523                 return FcFalse;
 524             }
 525             FcGlobalCacheReferenced (cache, &f->info);
 526         }
 527     for (subdir = d->subdirs; subdir; subdir = subdir->next)
 528     {
 529         if (!FcCacheFontSetAdd (set, dirs, dir, dir_len,
 530                                 subdir->file, FC_FONT_FILE_DIR))
 531         {
 532             cache->broken = FcTrue;
 533             return FcFalse;
 534         }
 535     }
 536
 537     FcGlobalCacheReferenced (cache, &d->info);
 538
 539     return FcTrue;
 540 }
 541
 542 /*
 543  * Locate the cache entry for a particular file
 544  */
 545 FcGlobalCacheFile *
 546 FcGlobalCacheFileGet (FcGlobalCache *cache,
 547                       const FcChar8 *file,
 548                       int           id,
 549                       int           *count)
 550 {
 551     FcFilePathInfo      i = FcFilePathInfoGet (file);
 552     FcGlobalCacheDir    *d = FcGlobalCacheDirGet (cache, i.dir,
 553                                                   i.dir_len, FcFalse);
 554     FcGlobalCacheFile   *f, *match = 0;
 555     int                 max = -1;
 556
 557     if (!d)
 558         return 0;
 559     for (f = d->ents[i.base_hash % FC_GLOBAL_CACHE_FILE_HASH_SIZE]; f; f = f->next)
 560     {
 561         if (f->info.hash == i.base_hash &&
 562             !strcmp ((const char *) f->info.file, (const char *) i.base))
 563         {
 564             if (f->id == id)
 565                 match = f;
 566             if (f->id > max)
 567                 max = f->id;
 568         }
 569     }
 570     if (count)
 571         *count = max;
 572     return match;
 573 }
 574
 575 /*
 576  * Add a file entry to the cache
 577  */
 578 static FcGlobalCacheInfo *
 579 FcGlobalCacheFileAdd (FcGlobalCache *cache,
 580                       const FcChar8 *path,
 581                       int           id,
 582                       time_t        time,
 583                       const FcChar8 *name,
 584                       FcBool        replace)
 585 {
 586     FcFilePathInfo      i = FcFilePathInfoGet (path);
 587     FcGlobalCacheDir    *d = FcGlobalCacheDirGet (cache, i.dir,
 588                                                   i.dir_len, FcTrue);
 589     FcGlobalCacheFile   *f, **prev;
 590
 591     if (!d)
 592         return 0;
 593     for (prev = &d->ents[i.base_hash % FC_GLOBAL_CACHE_FILE_HASH_SIZE];
 594          (f = *prev);
 595          prev = &(*prev)->next)
 596     {
 597         if (f->info.hash == i.base_hash &&
 598             f->id == id &&
 599             !strcmp ((const char *) f->info.file, (const char *) i.base))
 600         {
 601             break;
 602         }
 603     }
 604     if (*prev)
 605     {
 606         if (!replace)
 607             return 0;
 608
 609         f = *prev;
 610         if (f->info.referenced)
 611             cache->referenced--;
 612         *prev = f->next;
 613         free (f);
 614     }
 615     f = malloc (sizeof (FcGlobalCacheFile) +
 616                 strlen ((char *) i.base) + 1 +
 617                 strlen ((char *) name) + 1);
 618     if (!f)
 619         return 0;
 620     f->next = *prev;
 621     *prev = f;
 622     f->info.hash = i.base_hash;
 623     f->info.file = (FcChar8 *) (f + 1);
 624     f->info.time = time;
 625     f->info.referenced = FcFalse;
 626     f->id = id;
 627     f->name = f->info.file + strlen ((char *) i.base) + 1;
 628     strcpy ((char *) f->info.file, (const char *) i.base);
 629     strcpy ((char *) f->name, (const char *) name);
 630     return &f->info;
 631 }
 632
 633 FcGlobalCache *
 634 FcGlobalCacheCreate (void)
 635 {
 636     FcGlobalCache   *cache;
 637     int             h;
 638
 639     cache = malloc (sizeof (FcGlobalCache));
 640     if (!cache)
 641         return 0;
 642     for (h = 0; h < FC_GLOBAL_CACHE_DIR_HASH_SIZE; h++)
 643         cache->ents[h] = 0;
 644     cache->entries = 0;
 645     cache->referenced = 0;
 646     cache->updated = FcFalse;
 647     cache->broken = FcFalse;
 648     return cache;
 649 }
 650
 651 void
 652 FcGlobalCacheDestroy (FcGlobalCache *cache)
 653 {
 654     FcGlobalCacheDir    *d, *next;
 655     int                 h;
 656
 657     for (h = 0; h < FC_GLOBAL_CACHE_DIR_HASH_SIZE; h++)
 658     {
 659         for (d = cache->ents[h]; d; d = next)
 660         {
 661             next = d->next;
 662             FcGlobalCacheDirDestroy (d);
 663         }
 664     }
 665     free (cache);
 666 }
 667
 668 /*
 669  * Cache file syntax is quite simple:
 670  *
 671  * "file_name" id time "font_name" \n
 672  */
 673
 674 void
 675 FcGlobalCacheLoad (FcGlobalCache    *cache,
 676                    const FcChar8    *cache_file)
 677 {
 678     FILE                *f;
 679     FcChar8             file_buf[8192], *file;
 680     int                 id;
 681     time_t              time;
 682     FcChar8             name_buf[8192], *name;
 683     FcGlobalCacheInfo   *info;
 684
 685     f = fopen ((char *) cache_file, "r");
 686     if (!f)
 687         return;
 688
 689     cache->updated = FcFalse;
 690     file = 0;
 691     name = 0;
 692     while ((file = FcCacheReadString (f, file_buf, sizeof (file_buf))) &&
 693            FcCacheReadInt (f, &id) &&
 694            FcCacheReadTime (f, &time) &&
 695            (name = FcCacheReadString (f, name_buf, sizeof (name_buf))))
 696     {
 697         if (FcDebug () & FC_DBG_CACHEV)
 698             printf ("FcGlobalCacheLoad \"%s\" \"%20.20s\"\n", file, name);
 699         if (!FcStrCmp (name, FC_FONT_FILE_DIR))
 700             info = FcGlobalCacheDirAdd (cache, file, time, FcFalse);
 701         else
 702             info = FcGlobalCacheFileAdd (cache, file, id, time, name, FcFalse);
 703         if (!info)
 704             cache->broken = FcTrue;
 705         else
 706             cache->entries++;
 707         if (FcDebug () & FC_DBG_CACHE_REF)
 708             printf ("FcGlobalCacheLoad entry %d %s\n",
 709                     cache->entries, file);
 710         if (file != file_buf)
 711             free (file);
 712         if (name != name_buf)
 713             free (name);
 714         file = 0;
 715         name = 0;
 716     }
 717     if (file && file != file_buf)
 718         free (file);
 719     if (name && name != name_buf)
 720         free (name);
 721     fclose (f);
 722 }
 723
 724 FcBool
 725 FcGlobalCacheUpdate (FcGlobalCache  *cache,
 726                      const FcChar8  *file,
 727                      int            id,
 728                      const FcChar8  *name)
 729 {
 730     const FcChar8       *match;
 731     struct stat         statb;
 732     FcGlobalCacheInfo   *info;
 733
 734     match = file;
 735
 736     if (stat ((char *) file, &statb) < 0)
 737         return FcFalse;
 738     if (S_ISDIR (statb.st_mode))
 739         info = FcGlobalCacheDirAdd (cache, file, statb.st_mtime,
 740                                    FcTrue);
 741     else
 742         info = FcGlobalCacheFileAdd (cache, file, id, statb.st_mtime,
 743                                     name, FcTrue);
 744     if (info)
 745     {
 746         FcGlobalCacheReferenced (cache, info);
 747         cache->updated = FcTrue;
 748     }
 749     else
 750         cache->broken = FcTrue;
 751     return info != 0;
 752 }
 753
 754 FcBool
 755 FcGlobalCacheSave (FcGlobalCache    *cache,
 756                    const FcChar8    *cache_file)
 757 {
 758     FILE                *f;
 759     int                 dir_hash, file_hash;
 760     FcGlobalCacheDir    *dir;
 761     FcGlobalCacheFile   *file;
 762     FcAtomic            *atomic;
 763
 764     if (!cache->updated && cache->referenced == cache->entries)
 765         return FcTrue;
 766
 767     if (cache->broken)
 768         return FcFalse;
 769
 770     /* Set-UID programs can't safely update the cache */
 771     if (getuid () != geteuid ())
 772         return FcFalse;
 773
 774     atomic = FcAtomicCreate (cache_file);
 775     if (!atomic)
 776         goto bail0;
 777     if (!FcAtomicLock (atomic))
 778         goto bail1;
 779     f = fopen ((char *) FcAtomicNewFile(atomic), "w");
 780     if (!f)
 781         goto bail2;
 782
 783     for (dir_hash = 0; dir_hash < FC_GLOBAL_CACHE_DIR_HASH_SIZE; dir_hash++)
 784     {
 785         for (dir = cache->ents[dir_hash]; dir; dir = dir->next)
 786         {
 787             if (!dir->info.referenced)
 788                 continue;
 789             if (!FcCacheWriteString (f, dir->info.file))
 790                 goto bail4;
 791             if (PUTC (' ', f) == EOF)
 792                 goto bail4;
 793             if (!FcCacheWriteInt (f, 0))
 794                 goto bail4;
 795             if (PUTC (' ', f) == EOF)
 796                 goto bail4;
 797             if (!FcCacheWriteTime (f, dir->info.time))
 798                 goto bail4;
 799             if (PUTC (' ', f) == EOF)
 800                 goto bail4;
 801             if (!FcCacheWriteString (f, (FcChar8 *) FC_FONT_FILE_DIR))
 802                 goto bail4;
 803             if (PUTC ('\n', f) == EOF)
 804                 goto bail4;
 805
 806             for (file_hash = 0; file_hash < FC_GLOBAL_CACHE_FILE_HASH_SIZE; file_hash++)
 807             {
 808                 for (file = dir->ents[file_hash]; file; file = file->next)
 809                 {
 810                     if (!file->info.referenced)
 811                         continue;
 812                     if (!FcCacheWritePath (f, dir->info.file, file->info.file))
 813                         goto bail4;
 814                     if (PUTC (' ', f) == EOF)
 815                         goto bail4;
 816                     if (!FcCacheWriteInt (f, file->id < 0 ? 0 : file->id))
 817                         goto bail4;
 818                     if (PUTC (' ', f) == EOF)
 819                         goto bail4;
 820                     if (!FcCacheWriteTime (f, file->info.time))
 821                         goto bail4;
 822                     if (PUTC (' ', f) == EOF)
 823                         goto bail4;
 824                     if (!FcCacheWriteString (f, file->name))
 825                         goto bail4;
 826                     if (PUTC ('\n', f) == EOF)
 827                         goto bail4;
 828                 }
 829             }
 830         }
 831     }
 832
 833     if (fclose (f) == EOF)
 834         goto bail3;
 835
 836     if (!FcAtomicReplaceOrig (atomic))
 837         goto bail3;
 838
 839     FcAtomicUnlock (atomic);
 840     FcAtomicDestroy (atomic);
 841
 842     cache->updated = FcFalse;
 843     return FcTrue;
 844
 845 bail4:
 846     fclose (f);
 847 bail3:
 848     FcAtomicDeleteNew (atomic);
 849 bail2:
 850     FcAtomicUnlock (atomic);
 851 bail1:
 852     FcAtomicDestroy (atomic);
 853 bail0:
 854     return FcFalse;
 855 }
 856
 857 FcBool
 858 FcDirCacheValid (const FcChar8 *dir)
 859 {
 860     FcChar8     *cache_file = FcStrPlus (dir, (FcChar8 *) "/" FC_DIR_CACHE_FILE);
 861     struct stat file_stat, dir_stat;
 862
 863     if (stat ((char *) dir, &dir_stat) < 0)
 864     {
 865         FcStrFree (cache_file);
 866         return FcFalse;
 867     }
 868     if (stat ((char *) cache_file, &file_stat) < 0)
 869     {
 870         FcStrFree (cache_file);
 871         return FcFalse;
 872     }
 873     FcStrFree (cache_file);
 874     /*
 875      * If the directory has been modified more recently than
 876      * the cache file, the cache is not valid
 877      */
 878     if (dir_stat.st_mtime - file_stat.st_mtime > 0)
 879         return FcFalse;
 880     return FcTrue;
 881 }
 882
 883 FcBool
 884 FcDirCacheReadDir (FcFontSet *set, FcStrSet *dirs, const FcChar8 *dir)
 885 {
 886     FcChar8         *cache_file = FcStrPlus (dir, (FcChar8 *) "/" FC_DIR_CACHE_FILE);
 887     FILE            *f;
 888     FcChar8         *base;
 889     int             id;
 890     int             dir_len;
 891     FcChar8         file_buf[8192], *file;
 892     FcChar8         name_buf[8192], *name;
 893     FcBool          ret = FcFalse;
 894
 895     if (!cache_file)
 896         goto bail0;
 897
 898     if (FcDebug () & FC_DBG_CACHE)
 899         printf ("FcDirCacheReadDir cache_file \"%s\"\n", cache_file);
 900
 901     f = fopen ((char *) cache_file, "r");
 902     if (!f)
 903     {
 904         if (FcDebug () & FC_DBG_CACHE)
 905             printf (" no cache file\n");
 906         goto bail1;
 907     }
 908
 909     if (!FcDirCacheValid (dir))
 910     {
 911         if (FcDebug () & FC_DBG_CACHE)
 912             printf (" cache file older than directory\n");
 913         goto bail2;
 914     }
 915
 916     base = (FcChar8 *) strrchr ((char *) cache_file, '/');
 917     if (!base)
 918         goto bail2;
 919     base++;
 920     dir_len = base - cache_file;
 921
 922     file = 0;
 923     name = 0;
 924     while ((file = FcCacheReadString (f, file_buf, sizeof (file_buf))) &&
 925            FcCacheReadInt (f, &id) &&
 926            (name = FcCacheReadString (f, name_buf, sizeof (name_buf))))
 927     {
 928         if (!FcCacheFontSetAdd (set, dirs, cache_file, dir_len,
 929                                 file, name))
 930             goto bail3;
 931         if (file != file_buf)
 932             free (file);
 933         if (name != name_buf)
 934             free (name);
 935         file = name = 0;
 936     }
 937     if (FcDebug () & FC_DBG_CACHE)
 938         printf (" cache loaded\n");
 939
 940     ret = FcTrue;
 941 bail3:
 942     if (file && file != file_buf)
 943         free (file);
 944     if (name && name != name_buf)
 945         free (name);
 946 bail2:
 947     fclose (f);
 948 bail1:
 949     free (cache_file);
 950 bail0:
 951     return ret;
 952 }
 953
 954 /*
 955  * return the path from the directory containing 'cache' to 'file'
 956  */
 957
 958 static const FcChar8 *
 959 FcFileBaseName (const FcChar8 *cache, const FcChar8 *file)
 960 {
 961     const FcChar8   *cache_slash;
 962
 963     cache_slash = (const FcChar8 *) strrchr ((const char *) cache, '/');
 964     if (cache_slash && !strncmp ((const char *) cache, (const char *) file,
 965                                  (cache_slash + 1) - cache))
 966         return file + ((cache_slash + 1) - cache);
 967     return file;
 968 }
 969
 970 FcBool
 971 FcDirCacheWriteDir (FcFontSet *set, FcStrSet *dirs, const FcChar8 *dir)
 972 {
 973     FcChar8         *cache_file = FcStrPlus (dir, (FcChar8 *) "/" FC_DIR_CACHE_FILE);
 974     FcPattern       *font;
 975     FILE            *f;
 976     FcChar8         *name;
 977     const FcChar8   *file, *base;
 978     int             n;
 979     int             id;
 980     FcBool          ret;
 981     FcStrList       *list;
 982
 983     if (!cache_file)
 984         goto bail0;
 985     if (FcDebug () & FC_DBG_CACHE)
 986         printf ("FcDirCacheWriteDir cache_file \"%s\"\n", cache_file);
 987
 988     f = fopen ((char *) cache_file, "w");
 989     if (!f)
 990     {
 991         if (FcDebug () & FC_DBG_CACHE)
 992             printf (" can't create \"%s\"\n", cache_file);
 993         goto bail1;
 994     }
 995
 996     list = FcStrListCreate (dirs);
 997     if (!list)
 998         goto bail2;
 999
1000     while ((dir = FcStrListNext (list)))
1001     {
1002         base = FcFileBaseName (cache_file, dir);
1003         if (!FcCacheWriteString (f, base))
1004             goto bail3;
1005         if (PUTC (' ', f) == EOF)
1006             goto bail3;
1007         if (!FcCacheWriteInt (f, 0))
1008             goto bail3;
1009         if (PUTC (' ', f) == EOF)
1010             goto bail3;
1011         if (!FcCacheWriteString (f, FC_FONT_FILE_DIR))
1012             goto bail3;
1013         if (PUTC ('\n', f) == EOF)
1014             goto bail3;
1015     }
1016
1017     for (n = 0; n < set->nfont; n++)
1018     {
1019         font = set->fonts[n];
1020         if (FcPatternGetString (font, FC_FILE, 0, (FcChar8 **) &file) != FcResultMatch)
1021             goto bail3;
1022         base = FcFileBaseName (cache_file, file);
1023         if (FcPatternGetInteger (font, FC_INDEX, 0, &id) != FcResultMatch)
1024             goto bail3;
1025         if (FcDebug () & FC_DBG_CACHEV)
1026             printf (" write file \"%s\"\n", base);
1027         if (!FcCacheWriteString (f, base))
1028             goto bail3;
1029         if (PUTC (' ', f) == EOF)
1030             goto bail3;
1031         if (!FcCacheWriteInt (f, id))
1032             goto bail3;
1033         if (PUTC (' ', f) == EOF)
1034             goto bail3;
1035         name = FcNameUnparse (font);
1036         if (!name)
1037             goto bail3;
1038         ret = FcCacheWriteString (f, name);
1039         free (name);
1040         if (!ret)
1041             goto bail3;
1042         if (PUTC ('\n', f) == EOF)
1043             goto bail3;
1044     }
1045
1046     FcStrListDone (list);
1047
1048     if (fclose (f) == EOF)
1049         goto bail1;
1050
1051     free (cache_file);
1052
1053     if (FcDebug () & FC_DBG_CACHE)
1054         printf (" cache written\n");
1055     return FcTrue;
1056
1057 bail3:
1058     FcStrListDone (list);
1059 bail2:
1060     fclose (f);
1061 bail1:
1062     unlink ((char *) cache_file);
1063     free (cache_file);
1064 bail0:
1065     return FcFalse;
1066 }