src/fclang.c

   1 /*
   2  * $RCSId: xc/lib/fontconfig/src/fclang.c,v 1.7 2002/08/26 23:34:31 keithp Exp $
   3  *
   4  * Copyright © 2002 Keith Packard
   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 typedef struct {
  28     const FcChar8       *lang;
  29     const FcCharSet     charset;
  30 } FcLangCharSet;
  31
  32 typedef struct {
  33     int begin;
  34     int end;
  35 } FcLangCharSetRange;
  36
  37 #include "../fc-lang/fclang.h"
  38
  39 struct _FcLangSet {
  40     FcChar32    map[NUM_LANG_SET_MAP];
  41     FcStrSet    *extra;
  42 };
  43
  44 #define FcLangSetBitSet(ls, id) ((ls)->map[(id)>>5] |= ((FcChar32) 1 << ((id) & 0x1f)))
  45 #define FcLangSetBitGet(ls, id) (((ls)->map[(id)>>5] >> ((id) & 0x1f)) & 1)
  46
  47 static FcBool langsets_populated = FcFalse;
  48
  49 FcLangSet *
  50 FcFreeTypeLangSet (const FcCharSet  *charset,
  51                    const FcChar8    *exclusiveLang)
  52 {
  53     int             i, j;
  54     FcChar32        missing;
  55     const FcCharSet *exclusiveCharset = 0;
  56     FcLangSet       *ls;
  57
  58     if (!langsets_populated)
  59     {
  60         FcLangCharSetPopulate ();
  61         langsets_populated = FcTrue;
  62     }
  63
  64     if (exclusiveLang)
  65         exclusiveCharset = FcCharSetForLang (exclusiveLang);
  66     ls = FcLangSetCreate ();
  67     if (!ls)
  68         return 0;
  69     for (i = 0; i < NUM_LANG_CHAR_SET; i++)
  70     {
  71         /*
  72          * Check for Han charsets to make fonts
  73          * which advertise support for a single language
  74          * not support other Han languages
  75          */
  76         if (exclusiveCharset &&
  77             FcFreeTypeIsExclusiveLang (fcLangCharSets[i].lang))
  78         {
  79             if (fcLangCharSets[i].charset.num != exclusiveCharset->num)
  80                 continue;
  81
  82             for (j = 0; j < fcLangCharSets[i].charset.num; j++)
  83                 if (FcCharSetGetLeaf(&fcLangCharSets[i].charset, j) !=
  84                     FcCharSetGetLeaf(exclusiveCharset, j))
  85                     continue;
  86         }
  87         missing = FcCharSetSubtractCount (&fcLangCharSets[i].charset, charset);
  88         if (FcDebug() & FC_DBG_SCANV)
  89         {
  90             if (missing && missing < 10)
  91             {
  92                 FcCharSet   *missed = FcCharSetSubtract (&fcLangCharSets[i].charset,
  93                                                          charset);
  94                 FcChar32    ucs4;
  95                 FcChar32    map[FC_CHARSET_MAP_SIZE];
  96                 FcChar32    next;
  97
  98                 printf ("\n%s(%d) ", fcLangCharSets[i].lang, missing);
  99                 printf ("{");
 100                 for (ucs4 = FcCharSetFirstPage (missed, map, &next);
 101                      ucs4 != FC_CHARSET_DONE;
 102                      ucs4 = FcCharSetNextPage (missed, map, &next))
 103                 {
 104                     int     i, j;
 105                     for (i = 0; i < FC_CHARSET_MAP_SIZE; i++)
 106                         if (map[i])
 107                         {
 108                             for (j = 0; j < 32; j++)
 109                                 if (map[i] & (1 << j))
 110                                     printf (" %04x", ucs4 + i * 32 + j);
 111                         }
 112                 }
 113                 printf (" }\n\t");
 114                 FcCharSetDestroy (missed);
 115             }
 116             else
 117                 printf ("%s(%d) ", fcLangCharSets[i].lang, missing);
 118         }
 119         if (!missing)
 120             FcLangSetBitSet (ls, i);
 121     }
 122
 123     if (FcDebug() & FC_DBG_SCANV)
 124         printf ("\n");
 125
 126
 127     return ls;
 128 }
 129
 130 #define FcLangEnd(c)    ((c) == '-' || (c) == '\0')
 131
 132 FcLangResult
 133 FcLangCompare (const FcChar8 *s1, const FcChar8 *s2)
 134 {
 135     FcChar8         c1, c2;
 136     FcLangResult    result = FcLangDifferentLang;
 137
 138     for (;;)
 139     {
 140         c1 = *s1++;
 141         c2 = *s2++;
 142
 143         c1 = FcToLower (c1);
 144         c2 = FcToLower (c2);
 145         if (c1 != c2)
 146         {
 147             if (FcLangEnd (c1) && FcLangEnd (c2))
 148                 result = FcLangDifferentCountry;
 149             return result;
 150         }
 151         else if (!c1)
 152             return FcLangEqual;
 153         else if (c1 == '-')
 154             result = FcLangDifferentCountry;
 155     }
 156 }
 157
 158 /*
 159  * Return FcTrue when super contains sub.
 160  *
 161  * super contains sub if super and sub have the same
 162  * language and either the same country or one
 163  * is missing the country
 164  */
 165
 166 static FcBool
 167 FcLangContains (const FcChar8 *super, const FcChar8 *sub)
 168 {
 169     FcChar8         c1, c2;
 170
 171     for (;;)
 172     {
 173         c1 = *super++;
 174         c2 = *sub++;
 175
 176         c1 = FcToLower (c1);
 177         c2 = FcToLower (c2);
 178         if (c1 != c2)
 179         {
 180             /* see if super has a country while sub is mising one */
 181             if (c1 == '-' && c2 == '\0')
 182                 return FcTrue;
 183             /* see if sub has a country while super is mising one */
 184             if (c1 == '\0' && c2 == '-')
 185                 return FcTrue;
 186             return FcFalse;
 187         }
 188         else if (!c1)
 189             return FcTrue;
 190     }
 191 }
 192
 193 const FcCharSet *
 194 FcCharSetForLang (const FcChar8 *lang)
 195 {
 196     int         i;
 197     int         country = -1;
 198
 199     if (!langsets_populated)
 200     {
 201         FcLangCharSetPopulate ();
 202         langsets_populated = FcTrue;
 203     }
 204
 205     for (i = 0; i < NUM_LANG_CHAR_SET; i++)
 206     {
 207         switch (FcLangCompare (lang, fcLangCharSets[i].lang)) {
 208         case FcLangEqual:
 209             return &fcLangCharSets[i].charset;
 210         case FcLangDifferentCountry:
 211             if (country == -1)
 212                 country = i;
 213         default:
 214             break;
 215         }
 216     }
 217     if (country == -1)
 218         return 0;
 219     return &fcLangCharSets[i].charset;
 220 }
 221
 222 FcLangSet *
 223 FcLangSetCreate (void)
 224 {
 225     FcLangSet   *ls;
 226
 227     ls = malloc (sizeof (FcLangSet));
 228     if (!ls)
 229         return 0;
 230     FcMemAlloc (FC_MEM_LANGSET, sizeof (FcLangSet));
 231     memset (ls->map, '\0', sizeof (ls->map));
 232     ls->extra = 0;
 233     return ls;
 234 }
 235
 236 void
 237 FcLangSetDestroy (FcLangSet *ls)
 238 {
 239     if (ls->extra)
 240         FcStrSetDestroy (ls->extra);
 241     FcMemFree (FC_MEM_LANGSET, sizeof (FcLangSet));
 242     free (ls);
 243 }
 244
 245 FcLangSet *
 246 FcLangSetCopy (const FcLangSet *ls)
 247 {
 248     FcLangSet   *new;
 249
 250     new = FcLangSetCreate ();
 251     if (!new)
 252         goto bail0;
 253     memcpy (new->map, ls->map, sizeof (new->map));
 254     if (ls->extra)
 255     {
 256         FcStrList       *list;
 257         FcChar8         *extra;
 258
 259         new->extra = FcStrSetCreate ();
 260         if (!new->extra)
 261             goto bail1;
 262
 263         list = FcStrListCreate (ls->extra);
 264         if (!list)
 265             goto bail1;
 266
 267         while ((extra = FcStrListNext (list)))
 268             if (!FcStrSetAdd (new->extra, extra))
 269             {
 270                 FcStrListDone (list);
 271                 goto bail1;
 272             }
 273         FcStrListDone (list);
 274     }
 275     return new;
 276 bail1:
 277     FcLangSetDestroy (new);
 278 bail0:
 279     return 0;
 280 }
 281
 282 static int
 283 FcLangSetIndex (const FcChar8 *lang)
 284 {
 285     int     low, high, mid = 0;
 286     int     cmp = 0;
 287     FcChar8 firstChar = FcToLower(lang[0]);
 288     FcChar8 secondChar = firstChar ? FcToLower(lang[1]) : '\0';
 289
 290     if (firstChar < 'a')
 291     {
 292         low = 0;
 293         high = fcLangCharSetRanges[0].begin;
 294     }
 295     else if(firstChar > 'z')
 296     {
 297         low = fcLangCharSetRanges[25].begin;
 298         high = NUM_LANG_CHAR_SET - 1;
 299     }
 300     else
 301     {
 302         low = fcLangCharSetRanges[firstChar - 'a'].begin;
 303         high = fcLangCharSetRanges[firstChar - 'a'].end;
 304         /* no matches */
 305         if (low > high)
 306             return -low; /* next entry after where it would be */
 307     }
 308
 309     while (low <= high)
 310     {
 311         mid = (high + low) >> 1;
 312         if(fcLangCharSets[mid].lang[0] != firstChar)
 313             cmp = FcStrCmpIgnoreCase(fcLangCharSets[mid].lang, lang);
 314         else
 315         {   /* fast path for resolving 2-letter languages (by far the most common) after
 316              * finding the first char (probably already true because of the hash table) */
 317             cmp = fcLangCharSets[mid].lang[1] - secondChar;
 318             if (cmp == 0 &&
 319                 (fcLangCharSets[mid].lang[2] != '\0' ||
 320                  lang[2] != '\0'))
 321             {
 322                 cmp = FcStrCmpIgnoreCase(fcLangCharSets[mid].lang+2,
 323                                          lang+2);
 324             }
 325         }
 326         if (cmp == 0)
 327             return mid;
 328         if (cmp < 0)
 329             low = mid + 1;
 330         else
 331             high = mid - 1;
 332     }
 333     if (cmp < 0)
 334         mid++;
 335     return -(mid + 1);
 336 }
 337
 338 FcBool
 339 FcLangSetAdd (FcLangSet *ls, const FcChar8 *lang)
 340 {
 341     int     id;
 342
 343     id = FcLangSetIndex (lang);
 344     if (id >= 0)
 345     {
 346         FcLangSetBitSet (ls, id);
 347         return FcTrue;
 348     }
 349     if (!ls->extra)
 350     {
 351         ls->extra = FcStrSetCreate ();
 352         if (!ls->extra)
 353             return FcFalse;
 354     }
 355     return FcStrSetAdd (ls->extra, lang);
 356 }
 357
 358 FcLangResult
 359 FcLangSetHasLang (const FcLangSet *ls, const FcChar8 *lang)
 360 {
 361     int             id;
 362     FcLangResult    best, r;
 363     int             i;
 364
 365     id = FcLangSetIndex (lang);
 366     if (id < 0)
 367         id = -id - 1;
 368     else if (FcLangSetBitGet (ls, id))
 369         return FcLangEqual;
 370     best = FcLangDifferentLang;
 371     for (i = id - 1; i >= 0; i--)
 372     {
 373         r = FcLangCompare (lang, fcLangCharSets[i].lang);
 374         if (r == FcLangDifferentLang)
 375             break;
 376         if (FcLangSetBitGet (ls, i) && r < best)
 377             best = r;
 378     }
 379     for (i = id; i < NUM_LANG_CHAR_SET; i++)
 380     {
 381         r = FcLangCompare (lang, fcLangCharSets[i].lang);
 382         if (r == FcLangDifferentLang)
 383             break;
 384         if (FcLangSetBitGet (ls, i) && r < best)
 385             best = r;
 386     }
 387     if (ls->extra)
 388     {
 389         FcStrList       *list = FcStrListCreate (ls->extra);
 390         FcChar8         *extra;
 391         FcLangResult    r;
 392
 393         if (list)
 394         {
 395             while (best > FcLangEqual && (extra = FcStrListNext (list)))
 396             {
 397                 r = FcLangCompare (lang, extra);
 398                 if (r < best)
 399                     best = r;
 400             }
 401             FcStrListDone (list);
 402         }
 403     }
 404     return best;
 405 }
 406
 407 static FcLangResult
 408 FcLangSetCompareStrSet (const FcLangSet *ls, FcStrSet *set)
 409 {
 410     FcStrList       *list = FcStrListCreate (set);
 411     FcLangResult    r, best = FcLangDifferentLang;
 412     FcChar8         *extra;
 413
 414     if (list)
 415     {
 416         while (best > FcLangEqual && (extra = FcStrListNext (list)))
 417         {
 418             r = FcLangSetHasLang (ls, extra);
 419             if (r < best)
 420                 best = r;
 421         }
 422         FcStrListDone (list);
 423     }
 424     return best;
 425 }
 426
 427 FcLangResult
 428 FcLangSetCompare (const FcLangSet *lsa, const FcLangSet *lsb)
 429 {
 430     int             i, j;
 431     FcLangResult    best, r;
 432
 433     for (i = 0; i < NUM_LANG_SET_MAP; i++)
 434         if (lsa->map[i] & lsb->map[i])
 435             return FcLangEqual;
 436     best = FcLangDifferentLang;
 437     for (j = 0; j < NUM_COUNTRY_SET; j++)
 438         for (i = 0; i < NUM_LANG_SET_MAP; i++)
 439             if ((lsa->map[i] & fcLangCountrySets[j][i]) &&
 440                 (lsb->map[i] & fcLangCountrySets[j][i]))
 441             {
 442                 best = FcLangDifferentCountry;
 443                 break;
 444             }
 445     if (lsa->extra)
 446     {
 447         r = FcLangSetCompareStrSet (lsb, lsa->extra);
 448         if (r < best)
 449             best = r;
 450     }
 451     if (best > FcLangEqual && lsb->extra)
 452     {
 453         r = FcLangSetCompareStrSet (lsa, lsb->extra);
 454         if (r < best)
 455             best = r;
 456     }
 457     return best;
 458 }
 459
 460 /*
 461  * Used in computing values -- mustn't allocate any storage
 462  */
 463 FcLangSet *
 464 FcLangSetPromote (const FcChar8 *lang)
 465 {
 466     static FcLangSet    ls;
 467     static FcStrSet     strs;
 468     static FcChar8      *str;
 469     int                 id;
 470
 471     memset (ls.map, '\0', sizeof (ls.map));
 472     ls.extra = 0;
 473     id = FcLangSetIndex (lang);
 474     if (id > 0)
 475     {
 476         FcLangSetBitSet (&ls, id);
 477     }
 478     else
 479     {
 480         ls.extra = &strs;
 481         strs.num = 1;
 482         strs.size = 1;
 483         strs.strs = &str;
 484         strs.ref = 1;
 485         str = (FcChar8 *) lang;
 486     }
 487     return &ls;
 488 }
 489
 490 FcChar32
 491 FcLangSetHash (const FcLangSet *ls)
 492 {
 493     FcChar32    h = 0;
 494     int         i;
 495
 496     for (i = 0; i < NUM_LANG_SET_MAP; i++)
 497         h ^= ls->map[i];
 498     if (ls->extra)
 499         h ^= ls->extra->num;
 500     return h;
 501 }
 502
 503 FcLangSet *
 504 FcNameParseLangSet (const FcChar8 *string)
 505 {
 506     FcChar8         lang[32],c;
 507     int i;
 508     FcLangSet       *ls;
 509
 510     ls = FcLangSetCreate ();
 511     if (!ls)
 512         goto bail0;
 513
 514     for(;;)
 515     {
 516         for(i = 0; i < 31;i++)
 517         {
 518             c = *string++;
 519             if(c == '\0' || c == '|')
 520                 break; /* end of this code */
 521             lang[i] = c;
 522         }
 523         lang[i] = '\0';
 524         if (!FcLangSetAdd (ls, lang))
 525             goto bail1;
 526         if(c == '\0')
 527             break;
 528     }
 529     return ls;
 530 bail1:
 531     FcLangSetDestroy (ls);
 532 bail0:
 533     return 0;
 534 }
 535
 536 FcBool
 537 FcNameUnparseLangSet (FcStrBuf *buf, const FcLangSet *ls)
 538 {
 539     int         i, bit;
 540     FcChar32    bits;
 541     FcBool      first = FcTrue;
 542
 543     for (i = 0; i < NUM_LANG_SET_MAP; i++)
 544     {
 545         if ((bits = ls->map[i]))
 546         {
 547             for (bit = 0; bit <= 31; bit++)
 548                 if (bits & (1 << bit))
 549                 {
 550                     int id = (i << 5) | bit;
 551                     if (!first)
 552                         if (!FcStrBufChar (buf, '|'))
 553                             return FcFalse;
 554                     if (!FcStrBufString (buf, fcLangCharSets[id].lang))
 555                         return FcFalse;
 556                     first = FcFalse;
 557                 }
 558         }
 559     }
 560     if (ls->extra)
 561     {
 562         FcStrList   *list = FcStrListCreate (ls->extra);
 563         FcChar8     *extra;
 564
 565         if (!list)
 566             return FcFalse;
 567         while ((extra = FcStrListNext (list)))
 568         {
 569             if (!first)
 570                 if (!FcStrBufChar (buf, '|'))
 571                     return FcFalse;
 572             if (!FcStrBufString (buf, extra))
 573                 return FcFalse;
 574             first = FcFalse;
 575         }
 576     }
 577     return FcTrue;
 578 }
 579
 580 FcBool
 581 FcLangSetEqual (const FcLangSet *lsa, const FcLangSet *lsb)
 582 {
 583     int     i;
 584
 585     for (i = 0; i < NUM_LANG_SET_MAP; i++)
 586     {
 587         if (lsa->map[i] != lsb->map[i])
 588             return FcFalse;
 589     }
 590     if (!lsa->extra && !lsb->extra)
 591         return FcTrue;
 592     if (lsa->extra && lsb->extra)
 593         return FcStrSetEqual (lsa->extra, lsb->extra);
 594     return FcFalse;
 595 }
 596
 597 static FcBool
 598 FcLangSetContainsLang (const FcLangSet *ls, const FcChar8 *lang)
 599 {
 600     int             id;
 601     int             i;
 602
 603     id = FcLangSetIndex (lang);
 604     if (id < 0)
 605         id = -id - 1;
 606     else if (FcLangSetBitGet (ls, id))
 607         return FcTrue;
 608     /*
 609      * search up and down among equal languages for a match
 610      */
 611     for (i = id - 1; i >= 0; i--)
 612     {
 613         if (FcLangCompare (fcLangCharSets[i].lang, lang) == FcLangDifferentLang)
 614             break;
 615         if (FcLangSetBitGet (ls, i) &&
 616             FcLangContains (fcLangCharSets[i].lang, lang))
 617             return FcTrue;
 618     }
 619     for (i = id; i < NUM_LANG_CHAR_SET; i++)
 620     {
 621         if (FcLangCompare (fcLangCharSets[i].lang, lang) == FcLangDifferentLang)
 622             break;
 623         if (FcLangSetBitGet (ls, i) &&
 624             FcLangContains (fcLangCharSets[i].lang, lang))
 625             return FcTrue;
 626     }
 627     if (ls->extra)
 628     {
 629         FcStrList       *list = FcStrListCreate (ls->extra);
 630         FcChar8         *extra;
 631
 632         if (list)
 633         {
 634             while ((extra = FcStrListNext (list)))
 635             {
 636                 if (FcLangContains (extra, lang))
 637                     break;
 638             }
 639             FcStrListDone (list);
 640             if (extra)
 641                 return FcTrue;
 642         }
 643     }
 644     return FcFalse;
 645 }
 646
 647 /*
 648  * return FcTrue if lsa contains every language in lsb
 649  */
 650 FcBool
 651 FcLangSetContains (const FcLangSet *lsa, const FcLangSet *lsb)
 652 {
 653     int             i, j;
 654     FcChar32        missing;
 655
 656     if (FcDebug() & FC_DBG_MATCHV)
 657     {
 658         printf ("FcLangSet "); FcLangSetPrint (lsa);
 659         printf (" contains "); FcLangSetPrint (lsb);
 660         printf ("\n");
 661     }
 662     /*
 663      * check bitmaps for missing language support
 664      */
 665     for (i = 0; i < NUM_LANG_SET_MAP; i++)
 666     {
 667         missing = lsb->map[i] & ~lsa->map[i];
 668         if (missing)
 669         {
 670             for (j = 0; j < 32; j++)
 671                 if (missing & (1 << j))
 672                 {
 673                     if (!FcLangSetContainsLang (lsa,
 674                                                 fcLangCharSets[i*32 + j].lang))
 675                     {
 676                         if (FcDebug() & FC_DBG_MATCHV)
 677                             printf ("\tMissing bitmap %s\n", fcLangCharSets[i*32+j].lang);
 678                         return FcFalse;
 679                     }
 680                 }
 681         }
 682     }
 683     if (lsb->extra)
 684     {
 685         FcStrList   *list = FcStrListCreate (lsb->extra);
 686         FcChar8     *extra;
 687
 688         if (list)
 689         {
 690             while ((extra = FcStrListNext (list)))
 691             {
 692                 if (!FcLangSetContainsLang (lsa, extra))
 693                 {
 694                     if (FcDebug() & FC_DBG_MATCHV)
 695                         printf ("\tMissing string %s\n", extra);
 696                     break;
 697                 }
 698             }
 699             FcStrListDone (list);
 700             if (extra)
 701                 return FcFalse;
 702         }
 703     }
 704     return FcTrue;
 705 }
 706
 707 static FcLangSet ** langsets = 0;
 708 static int langset_bank_count = 0, langset_ptr = 0, langset_count = 0;
 709
 710 void
 711 FcLangSetNewBank (void)
 712 {
 713     langset_count = 0;
 714 }
 715
 716 /* ideally, should only write one copy of any particular FcLangSet */
 717 int
 718 FcLangSetNeededBytes (const FcLangSet *l)
 719 {
 720     langset_count++;
 721     return sizeof (FcLangSet);
 722 }
 723
 724 static FcBool
 725 FcLangSetEnsureBank (int bi)
 726 {
 727     if (!langsets || bi >= langset_bank_count)
 728     {
 729         int new_count = langset_bank_count + 2;
 730         int i;
 731         FcLangSet** tt;
 732         tt = realloc(langsets, new_count * sizeof(FcLangSet *));
 733         if (!tt)
 734             return FcFalse;
 735
 736         langsets = tt;
 737         for (i = langset_bank_count; i < new_count; i++)
 738             langsets[i] = 0;
 739         langset_bank_count = new_count;
 740     }
 741
 742     return FcTrue;
 743 }
 744
 745 void *
 746 FcLangSetDistributeBytes (FcCache * metadata, void * block_ptr)
 747 {
 748     int bi = FcCacheBankToIndex(metadata->bank);
 749     if (!FcLangSetEnsureBank(bi))
 750         return 0;
 751
 752     langsets[bi] = block_ptr;
 753     block_ptr = (void *)((char *)block_ptr +
 754                          langset_count * sizeof(FcLangSet));
 755     langset_ptr = 0;
 756     metadata->langset_count = langset_count;
 757     return block_ptr;
 758 }
 759
 760 FcLangSet *
 761 FcLangSetSerialize(int bank, FcLangSet *l)
 762 {
 763     int p = langset_ptr, bi = FcCacheBankToIndex(bank);
 764
 765     if (!l) return 0;
 766
 767     langsets[bi][langset_ptr] = *l;
 768     langsets[bi][langset_ptr].extra = 0;
 769     langset_ptr++;
 770     return &langsets[bi][p];
 771 }
 772
 773 void *
 774 FcLangSetUnserialize (FcCache metadata, void *block_ptr)
 775 {
 776     int bi = FcCacheBankToIndex(metadata.bank);
 777     if (!FcLangSetEnsureBank(bi))
 778         return 0;
 779
 780     FcMemAlloc (FC_MEM_LANGSET, metadata.langset_count * sizeof(FcLangSet));
 781     langsets[bi] = (FcLangSet *)block_ptr;
 782     block_ptr = (void *)((char *)block_ptr +
 783                          metadata.langset_count * sizeof(FcLangSet));
 784     return block_ptr;
 785 }