kc3-lang/freetype/src/sfnt/ttcmap0.c
-
Show log
Commit
-
Hash : 3d780173
Author :
Date : 2004-01-11T10:01:08
Make `FT_Get_CMap_Language_ID' work with CFF. Bug reported by Steve Hartwell <shspamsink@comcast.net>. * src/cff/cffdrivr.c: Include FT_SERVICE_TT_CMAP_H. (cff_services): Added an entry for FT_SERVICE_ID_TT_CMAP. (cff_get_cmap_info): New function. (cff_service_get_cmap_info) New entry for cff_services. * src/sfnt/ttcmap0.c: Exit loop after a format match has been found. Suggested by Steve Hartwell <shspamsink@comcast.net>.
-
src/sfnt/ttcmap0.c
-
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991
/***************************************************************************/ /* */ /* ttcmap0.c */ /* */ /* TrueType new character mapping table (cmap) support (body). */ /* */ /* Copyright 2002, 2003 by */ /* David Turner, Robert Wilhelm, and Werner Lemberg. */ /* */ /* This file is part of the FreeType project, and may only be used, */ /* modified, and distributed under the terms of the FreeType project */ /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ /* this file you indicate that you have read the license and */ /* understand and accept it fully. */ /* */ /***************************************************************************/ #include <ft2build.h> #include FT_INTERNAL_DEBUG_H #include FT_INTERNAL_OBJECTS_H #include FT_INTERNAL_STREAM_H #include "ttload.h" #include "ttcmap0.h" #include "sferrors.h" /*************************************************************************/ /* */ /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ /* messages during execution. */ /* */ #undef FT_COMPONENT #define FT_COMPONENT trace_ttcmap #define TT_PEEK_SHORT FT_PEEK_SHORT #define TT_PEEK_USHORT FT_PEEK_USHORT #define TT_PEEK_LONG FT_PEEK_LONG #define TT_PEEK_ULONG FT_PEEK_ULONG #define TT_NEXT_SHORT FT_NEXT_SHORT #define TT_NEXT_USHORT FT_NEXT_USHORT #define TT_NEXT_LONG FT_NEXT_LONG #define TT_NEXT_ULONG FT_NEXT_ULONG FT_CALLBACK_DEF( FT_Error ) tt_cmap_init( TT_CMap cmap, FT_Byte* table ) { cmap->data = table; return 0; } /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** FORMAT 0 *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /* */ /* TABLE OVERVIEW */ /* -------------- */ /* */ /* NAME OFFSET TYPE DESCRIPTION */ /* */ /* format 0 USHORT must be 0 */ /* length 2 USHORT table length in bytes */ /* language 4 USHORT Mac language code */ /* glyph_ids 6 BYTE[256] array of glyph indices */ /* 262 */ /* */ #ifdef TT_CONFIG_CMAP_FORMAT_0 FT_CALLBACK_DEF( void ) tt_cmap0_validate( FT_Byte* table, FT_Validator valid ) { FT_Byte* p = table + 2; FT_UInt length = TT_NEXT_USHORT( p ); if ( table + length > valid->limit || length < 262 ) FT_INVALID_TOO_SHORT; /* check glyph indices whenever necessary */ if ( valid->level >= FT_VALIDATE_TIGHT ) { FT_UInt n, idx; p = table + 6; for ( n = 0; n < 256; n++ ) { idx = *p++; if ( idx >= TT_VALID_GLYPH_COUNT( valid ) ) FT_INVALID_GLYPH_ID; } } } FT_CALLBACK_DEF( FT_UInt ) tt_cmap0_char_index( TT_CMap cmap, FT_UInt32 char_code ) { FT_Byte* table = cmap->data; return char_code < 256 ? table[6 + char_code] : 0; } FT_CALLBACK_DEF( FT_UInt ) tt_cmap0_char_next( TT_CMap cmap, FT_UInt32 *pchar_code ) { FT_Byte* table = cmap->data; FT_UInt32 charcode = *pchar_code; FT_UInt32 result = 0; FT_UInt gindex = 0; table += 6; /* go to glyph ids */ while ( ++charcode < 256 ) { gindex = table[charcode]; if ( gindex != 0 ) { result = charcode; break; } } *pchar_code = result; return gindex; } FT_CALLBACK_DEF( FT_Error ) tt_cmap0_get_info( TT_CMap cmap, TT_CMapInfo *cmap_info ) { FT_Byte* p = cmap->data + 4; cmap_info->language = (FT_ULong)TT_PEEK_USHORT( p ); return FT_Err_Ok; } FT_CALLBACK_TABLE_DEF const TT_CMap_ClassRec tt_cmap0_class_rec = { { sizeof( TT_CMapRec ), (FT_CMap_InitFunc) tt_cmap_init, (FT_CMap_DoneFunc) NULL, (FT_CMap_CharIndexFunc)tt_cmap0_char_index, (FT_CMap_CharNextFunc) tt_cmap0_char_next }, 0, (TT_CMap_ValidateFunc) tt_cmap0_validate, (TT_CMap_Info_GetFunc) tt_cmap0_get_info }; #endif /* TT_CONFIG_CMAP_FORMAT_0 */ /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** FORMAT 2 *****/ /***** *****/ /***** This is used for certain CJK encodings that encode text in a *****/ /***** mixed 8/16 bits encoding along the following lines: *****/ /***** *****/ /***** * Certain byte values correspond to an 8-bit character code *****/ /***** (typically in the range 0..127 for ASCII compatibility). *****/ /***** *****/ /***** * Certain byte values signal the first byte of a 2-byte *****/ /***** character code (but these values are also valid as the *****/ /***** second byte of a 2-byte character). *****/ /***** *****/ /***** The following charmap lookup and iteration functions all *****/ /***** assume that the value "charcode" correspond to following: *****/ /***** *****/ /***** - For one byte characters, "charcode" is simply the *****/ /***** character code. *****/ /***** *****/ /***** - For two byte characters, "charcode" is the 2-byte *****/ /***** character code in big endian format. More exactly: *****/ /***** *****/ /***** (charcode >> 8) is the first byte value *****/ /***** (charcode & 0xFF) is the second byte value *****/ /***** *****/ /***** Note that not all values of "charcode" are valid according *****/ /***** to these rules, and the function moderately check the *****/ /***** arguments. *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /* */ /* TABLE OVERVIEW */ /* -------------- */ /* */ /* NAME OFFSET TYPE DESCRIPTION */ /* */ /* format 0 USHORT must be 2 */ /* length 2 USHORT table length in bytes */ /* language 4 USHORT Mac language code */ /* keys 6 USHORT[256] sub-header keys */ /* subs 518 SUBHEAD[NSUBS] sub-headers array */ /* glyph_ids 518+NSUB*8 USHORT[] glyph id array */ /* */ /* The `keys' table is used to map charcode high-bytes to sub-headers. */ /* The value of `NSUBS' is the number of sub-headers defined in the */ /* table and is computed by finding the maximum of the `keys' table. */ /* */ /* Note that for any n, `keys[n]' is a byte offset within the `subs' */ /* table, i.e., it is the corresponding sub-header index multiplied */ /* by 8. */ /* */ /* Each sub-header has the following format: */ /* */ /* NAME OFFSET TYPE DESCRIPTION */ /* */ /* first 0 USHORT first valid low-byte */ /* count 2 USHORT number of valid low-bytes */ /* delta 4 SHORT see below */ /* offset 6 USHORT see below */ /* */ /* A sub-header defines, for each high-byte, the range of valid */ /* low-bytes within the charmap. Note that the range defined by `first' */ /* and `count' must be completely included in the interval [0..255] */ /* according to the specification. */ /* */ /* If a character code is contained within a given sub-header, then */ /* mapping it to a glyph index is done as follows: */ /* */ /* * The value of `offset' is read. This is a _byte_ distance from the */ /* location of the `offset' field itself into a slice of the */ /* `glyph_ids' table. Let's call it `slice' (it's a USHORT[] too). */ /* */ /* * The value `slice[char.lo - first]' is read. If it is 0, there is */ /* no glyph for the charcode. Otherwise, the value of `delta' is */ /* added to it (modulo 65536) to form a new glyph index. */ /* */ /* It is up to the validation routine to check that all offsets fall */ /* within the glyph ids table (and not within the `subs' table itself or */ /* outside of the CMap). */ /* */ #ifdef TT_CONFIG_CMAP_FORMAT_2 FT_CALLBACK_DEF( void ) tt_cmap2_validate( FT_Byte* table, FT_Validator valid ) { FT_Byte* p = table + 2; /* skip format */ FT_UInt length = TT_PEEK_USHORT( p ); FT_UInt n, max_subs; FT_Byte* keys; /* keys table */ FT_Byte* subs; /* sub-headers */ FT_Byte* glyph_ids; /* glyph id array */ if ( table + length > valid->limit || length < 6 + 512 ) FT_INVALID_TOO_SHORT; keys = table + 6; /* parse keys to compute sub-headers count */ p = keys; max_subs = 0; for ( n = 0; n < 256; n++ ) { FT_UInt idx = TT_NEXT_USHORT( p ); /* value must be multiple of 8 */ if ( valid->level >= FT_VALIDATE_PARANOID && ( idx & 7 ) != 0 ) FT_INVALID_DATA; idx >>= 3; if ( idx > max_subs ) max_subs = idx; } FT_ASSERT( p == table + 518 ); subs = p; glyph_ids = subs + (max_subs + 1) * 8; if ( glyph_ids > valid->limit ) FT_INVALID_TOO_SHORT; /* parse sub-headers */ for ( n = 0; n <= max_subs; n++ ) { FT_UInt first_code, code_count, offset; FT_Int delta; FT_Byte* ids; first_code = TT_NEXT_USHORT( p ); code_count = TT_NEXT_USHORT( p ); delta = TT_NEXT_SHORT( p ); offset = TT_NEXT_USHORT( p ); /* check range within 0..255 */ if ( valid->level >= FT_VALIDATE_PARANOID ) { if ( first_code >= 256 || first_code + code_count > 256 ) FT_INVALID_DATA; } /* check offset */ if ( offset != 0 ) { ids = p - 2 + offset; if ( ids < glyph_ids || ids + code_count*2 > table + length ) FT_INVALID_OFFSET; /* check glyph ids */ if ( valid->level >= FT_VALIDATE_TIGHT ) { FT_Byte* limit = p + code_count * 2; FT_UInt idx; for ( ; p < limit; ) { idx = TT_NEXT_USHORT( p ); if ( idx != 0 ) { idx = ( idx + delta ) & 0xFFFFU; if ( idx >= TT_VALID_GLYPH_COUNT( valid ) ) FT_INVALID_GLYPH_ID; } } } } } } /* return sub header corresponding to a given character code */ /* NULL on invalid charcode */ static FT_Byte* tt_cmap2_get_subheader( FT_Byte* table, FT_UInt32 char_code ) { FT_Byte* result = NULL; if ( char_code < 0x10000UL ) { FT_UInt char_lo = (FT_UInt)( char_code & 0xFF ); FT_UInt char_hi = (FT_UInt)( char_code >> 8 ); FT_Byte* p = table + 6; /* keys table */ FT_Byte* subs = table + 518; /* subheaders table */ FT_Byte* sub; if ( char_hi == 0 ) { /* an 8-bit character code -- we use subHeader 0 in this case */ /* to test whether the character code is in the charmap */ /* */ sub = subs; /* jump to first sub-header */ /* check that the sub-header for this byte is 0, which */ /* indicates that it's really a valid one-byte value */ /* Otherwise, return 0 */ /* */ p += char_lo * 2; if ( TT_PEEK_USHORT( p ) != 0 ) goto Exit; } else { /* a 16-bit character code */ /* jump to key entry */ p += char_hi * 2; /* jump to sub-header */ sub = subs + ( FT_PAD_FLOOR( TT_PEEK_USHORT( p ), 8 ) ); /* check that the high byte isn't a valid one-byte value */ if ( sub == subs ) goto Exit; } result = sub; } Exit: return result; } FT_CALLBACK_DEF( FT_UInt ) tt_cmap2_char_index( TT_CMap cmap, FT_UInt32 char_code ) { FT_Byte* table = cmap->data; FT_UInt result = 0; FT_Byte* subheader; subheader = tt_cmap2_get_subheader( table, char_code ); if ( subheader ) { FT_Byte* p = subheader; FT_UInt idx = (FT_UInt)(char_code & 0xFF); FT_UInt start, count; FT_Int delta; FT_UInt offset; start = TT_NEXT_USHORT( p ); count = TT_NEXT_USHORT( p ); delta = TT_NEXT_SHORT ( p ); offset = TT_PEEK_USHORT( p ); idx -= start; if ( idx < count && offset != 0 ) { p += offset + 2 * idx; idx = TT_PEEK_USHORT( p ); if ( idx != 0 ) result = (FT_UInt)( idx + delta ) & 0xFFFFU; } } return result; } FT_CALLBACK_DEF( FT_UInt ) tt_cmap2_char_next( TT_CMap cmap, FT_UInt32 *pcharcode ) { FT_Byte* table = cmap->data; FT_UInt gindex = 0; FT_UInt32 result = 0; FT_UInt32 charcode = *pcharcode + 1; FT_Byte* subheader; while ( charcode < 0x10000UL ) { subheader = tt_cmap2_get_subheader( table, charcode ); if ( subheader ) { FT_Byte* p = subheader; FT_UInt start = TT_NEXT_USHORT( p ); FT_UInt count = TT_NEXT_USHORT( p ); FT_Int delta = TT_NEXT_SHORT ( p ); FT_UInt offset = TT_PEEK_USHORT( p ); FT_UInt char_lo = (FT_UInt)( charcode & 0xFF ); FT_UInt pos, idx; if ( offset == 0 ) goto Next_SubHeader; if ( char_lo < start ) { char_lo = start; pos = 0; } else pos = (FT_UInt)( char_lo - start ); p += offset + pos * 2; charcode = FT_PAD_FLOOR( charcode, 256 ) + char_lo; for ( ; pos < count; pos++, charcode++ ) { idx = TT_NEXT_USHORT( p ); if ( idx != 0 ) { gindex = ( idx + delta ) & 0xFFFFU; if ( gindex != 0 ) { result = charcode; goto Exit; } } } } /* jump to next sub-header, i.e. higher byte value */ Next_SubHeader: charcode = FT_PAD_FLOOR( charcode, 256 ) + 256; } Exit: *pcharcode = result; return gindex; } FT_CALLBACK_DEF( FT_Error ) tt_cmap2_get_info( TT_CMap cmap, TT_CMapInfo *cmap_info ) { FT_Byte* p = cmap->data + 4; cmap_info->language = (FT_ULong)TT_PEEK_USHORT( p ); return FT_Err_Ok; } FT_CALLBACK_TABLE_DEF const TT_CMap_ClassRec tt_cmap2_class_rec = { { sizeof( TT_CMapRec ), (FT_CMap_InitFunc) tt_cmap_init, (FT_CMap_DoneFunc) NULL, (FT_CMap_CharIndexFunc)tt_cmap2_char_index, (FT_CMap_CharNextFunc) tt_cmap2_char_next }, 2, (TT_CMap_ValidateFunc) tt_cmap2_validate, (TT_CMap_Info_GetFunc) tt_cmap2_get_info }; #endif /* TT_CONFIG_CMAP_FORMAT_2 */ /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** FORMAT 4 *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /* */ /* TABLE OVERVIEW */ /* -------------- */ /* */ /* NAME OFFSET TYPE DESCRIPTION */ /* */ /* format 0 USHORT must be 4 */ /* length 2 USHORT table length */ /* in bytes */ /* language 4 USHORT Mac language code */ /* */ /* segCountX2 6 USHORT 2*NUM_SEGS */ /* searchRange 8 USHORT 2*(1 << LOG_SEGS) */ /* entrySelector 10 USHORT LOG_SEGS */ /* rangeShift 12 USHORT segCountX2 - */ /* searchRange */ /* */ /* endCount 14 USHORT[NUM_SEGS] end charcode for */ /* each segment; last */ /* is 0xFFFF */ /* */ /* pad 14+NUM_SEGS*2 USHORT padding */ /* */ /* startCount 16+NUM_SEGS*2 USHORT[NUM_SEGS] first charcode for */ /* each segment */ /* */ /* idDelta 16+NUM_SEGS*4 SHORT[NUM_SEGS] delta for each */ /* segment */ /* idOffset 16+NUM_SEGS*6 SHORT[NUM_SEGS] range offset for */ /* each segment; can be */ /* zero */ /* */ /* glyphIds 16+NUM_SEGS*8 USHORT[] array of glyph id */ /* ranges */ /* */ /* Character codes are modelled by a series of ordered (increasing) */ /* intervals called segments. Each segment has start and end codes, */ /* provided by the `startCount' and `endCount' arrays. Segments must */ /* not be overlapping and the last segment should always contain the */ /* `0xFFFF' endCount. */ /* */ /* The fields `searchRange', `entrySelector' and `rangeShift' are better */ /* ignored (they are traces of over-engineering in the TrueType */ /* specification). */ /* */ /* Each segment also has a signed `delta', as well as an optional offset */ /* within the `glyphIds' table. */ /* */ /* If a segment's idOffset is 0, the glyph index corresponding to any */ /* charcode within the segment is obtained by adding the value of */ /* `idDelta' directly to the charcode, modulo 65536. */ /* */ /* Otherwise, a glyph index is taken from the glyph ids sub-array for */ /* the segment, and the value of `idDelta' is added to it. */ /* */ /* */ /* Finally, note that certain fonts contain invalid charmaps that */ /* contain end=0xFFFF, start=0xFFFF, delta=0x0001, offset=0xFFFF at the */ /* of their charmaps (e.g. opens___.ttf which comes with OpenOffice.org) */ /* we need special code to deal with them correctly... */ /* */ #ifdef TT_CONFIG_CMAP_FORMAT_4 FT_CALLBACK_DEF( void ) tt_cmap4_validate( FT_Byte* table, FT_Validator valid ) { FT_Byte* p = table + 2; /* skip format */ FT_UInt length = TT_NEXT_USHORT( p ); FT_Byte *ends, *starts, *offsets, *deltas, *glyph_ids; FT_UInt num_segs; /* in certain fonts, the `length' field is invalid and goes */ /* out of bound. We try to correct this here... */ if ( length < 16 ) FT_INVALID_TOO_SHORT; if ( table + length > valid->limit ) { if ( valid->level >= FT_VALIDATE_TIGHT ) FT_INVALID_TOO_SHORT; length = (FT_UInt)( valid->limit - table ); } p = table + 6; num_segs = TT_NEXT_USHORT( p ); /* read segCountX2 */ if ( valid->level >= FT_VALIDATE_PARANOID ) { /* check that we have an even value here */ if ( num_segs & 1 ) FT_INVALID_DATA; } num_segs /= 2; /* check the search parameters - even though we never use them */ /* */ if ( valid->level >= FT_VALIDATE_PARANOID ) { /* check the values of 'searchRange', 'entrySelector', 'rangeShift' */ FT_UInt search_range = TT_NEXT_USHORT( p ); FT_UInt entry_selector = TT_NEXT_USHORT( p ); FT_UInt range_shift = TT_NEXT_USHORT( p ); if ( ( search_range | range_shift ) & 1 ) /* must be even values */ FT_INVALID_DATA; search_range /= 2; range_shift /= 2; /* `search range' is the greatest power of 2 that is <= num_segs */ if ( search_range > num_segs || search_range * 2 < num_segs || search_range + range_shift != num_segs || search_range != ( 1U << entry_selector ) ) FT_INVALID_DATA; } ends = table + 14; starts = table + 16 + num_segs * 2; deltas = starts + num_segs * 2; offsets = deltas + num_segs * 2; glyph_ids = offsets + num_segs * 2; if ( glyph_ids > table + length ) FT_INVALID_TOO_SHORT; /* check last segment, its end count must be FFFF */ if ( valid->level >= FT_VALIDATE_PARANOID ) { p = ends + ( num_segs - 1 ) * 2; if ( TT_PEEK_USHORT( p ) != 0xFFFFU ) FT_INVALID_DATA; } /* check that segments are sorted in increasing order and do not */ /* overlap; check also the offsets */ { FT_UInt start, end, last = 0, offset, n; FT_Int delta; for ( n = 0; n < num_segs; n++ ) { p = starts + n * 2; start = TT_PEEK_USHORT( p ); p = ends + n * 2; end = TT_PEEK_USHORT( p ); p = deltas + n * 2; delta = TT_PEEK_SHORT( p ); p = offsets + n * 2; offset = TT_PEEK_USHORT( p ); if ( start > end ) FT_INVALID_DATA; /* this test should be performed at default validation level; */ /* unfortunately, some popular Asian fonts present overlapping */ /* ranges in their charmaps */ /* */ if ( valid->level >= FT_VALIDATE_TIGHT ) { if ( n > 0 && start <= last ) FT_INVALID_DATA; } if ( offset && offset != 0xFFFFU ) { p += offset; /* start of glyph id array */ /* check that we point within the glyph ids table only */ if ( valid->level >= FT_VALIDATE_TIGHT ) { if ( p < glyph_ids || p + ( end - start + 1 ) * 2 > table + length ) FT_INVALID_DATA; } else { if ( p < glyph_ids || p + ( end - start + 1 ) * 2 > valid->limit ) FT_INVALID_DATA; } /* check glyph indices within the segment range */ if ( valid->level >= FT_VALIDATE_TIGHT ) { FT_UInt i, idx; for ( i = start; i < end; i++ ) { idx = FT_NEXT_USHORT( p ); if ( idx != 0 ) { idx = (FT_UInt)( idx + delta ) & 0xFFFFU; if ( idx >= TT_VALID_GLYPH_COUNT( valid ) ) FT_INVALID_GLYPH_ID; } } } } else if ( offset == 0xFFFFU ) { /* Some fonts (erroneously?) use a range offset of 0xFFFF */ /* to mean missing glyph in cmap table */ /* */ if ( valid->level >= FT_VALIDATE_PARANOID || n != num_segs - 1 || !( start == 0xFFFFU && end == 0xFFFFU && delta == 0x1U ) ) FT_INVALID_DATA; } last = end; } } } FT_CALLBACK_DEF( FT_UInt ) tt_cmap4_char_index( TT_CMap cmap, FT_UInt32 char_code ) { FT_Byte* table = cmap->data; FT_UInt result = 0; if ( char_code < 0x10000UL ) { FT_UInt idx, num_segs2; FT_Int delta; FT_UInt code = (FT_UInt)char_code; FT_Byte* p; p = table + 6; num_segs2 = FT_PAD_FLOOR( TT_PEEK_USHORT( p ), 2 ); /* be paranoid! */ #if 1 /* Some fonts have more than 170 segments in their charmaps! */ /* We changed this function to use a more efficient binary */ /* search for improving performance */ { FT_UInt min = 0; FT_UInt max = num_segs2 >> 1; FT_UInt mid, start, end, offset; while ( min < max ) { mid = ( min + max ) >> 1; p = table + 14 + mid * 2; end = TT_NEXT_USHORT( p ); p += num_segs2; start = TT_PEEK_USHORT( p); if ( code < start ) max = mid; else if ( code > end ) min = mid + 1; else { /* we found the segment */ idx = code; p += num_segs2; delta = TT_PEEK_SHORT( p ); p += num_segs2; offset = TT_PEEK_USHORT( p ); if ( offset == 0xFFFFU ) goto Exit; if ( offset != 0 ) { p += offset + 2 * ( idx - start ); idx = TT_PEEK_USHORT( p ); } if ( idx != 0 ) result = (FT_UInt)( idx + delta ) & 0xFFFFU; goto Exit; } } } #else /* 0 - old code */ { FT_UInt n; FT_Byte* q; p = table + 14; /* ends table */ q = table + 16 + num_segs2; /* starts table */ for ( n = 0; n < num_segs2; n += 2 ) { FT_UInt end = TT_NEXT_USHORT( p ); FT_UInt start = TT_NEXT_USHORT( q ); FT_UInt offset; if ( code < start ) break; if ( code <= end ) { idx = code; p = q + num_segs2 - 2; delta = TT_PEEK_SHORT( p ); p += num_segs2; offset = TT_PEEK_USHORT( p ); if ( offset == 0xFFFFU ) goto Exit; if ( offset != 0 ) { p += offset + 2 * ( idx - start ); idx = TT_PEEK_USHORT( p ); } if ( idx != 0 ) result = (FT_UInt)( idx + delta ) & 0xFFFFU; } } } #endif /* 0 */ } Exit: return result; } FT_CALLBACK_DEF( FT_UInt ) tt_cmap4_char_next( TT_CMap cmap, FT_UInt32 *pchar_code ) { FT_Byte* table = cmap->data; FT_UInt32 result = 0; FT_UInt gindex = 0; FT_UInt32 char_code = *pchar_code; FT_Byte* p; FT_UInt code, num_segs2; if ( char_code >= 0xFFFFUL ) goto Exit; code = (FT_UInt)char_code + 1; p = table + 6; num_segs2 = FT_PAD_FLOOR( TT_PEEK_USHORT(p), 2 ); /* ensure even-ness */ #if 1 for (;;) { /* Some fonts have more than 170 segments in their charmaps! */ /* We changed this function to use a more efficient binary */ /* search */ FT_UInt offset; FT_Int delta; FT_UInt min = 0; FT_UInt max = num_segs2 >> 1; FT_UInt mid, start, end; FT_UInt hi; /* we begin by finding the segment which end is closer to our code point */ hi = max + 1; while ( min < max ) { mid = ( min + max ) >> 1; p = table + 14 + mid * 2; end = TT_PEEK_USHORT( p ); if ( end < code ) min = mid + 1; else { hi = mid; max = mid; } } if ( hi > max ) { /* the point is behind the last segment; we will exit right now */ goto Exit; } p = table + 14 + hi * 2; end = TT_PEEK_USHORT( p ); p += 2 + num_segs2; start = TT_PEEK_USHORT( p ); if ( code < start ) code = start; p += num_segs2; delta = TT_PEEK_USHORT( p ); p += num_segs2; offset = TT_PEEK_USHORT( p ); if ( offset != 0 && offset != 0xFFFFU ) { /* parse the glyph ids array for non-zero index */ p += offset + ( code - start ) * 2; while ( code <= end ) { gindex = TT_NEXT_USHORT( p ); if ( gindex != 0 ) { gindex = (FT_UInt)( gindex + delta ) & 0xFFFFU; if ( gindex != 0 ) { result = code; goto Exit; } } code++; } } else if ( offset == 0xFFFFU ) { /* an offset of 0xFFFF means an empty glyph in certain fonts! */ code = end + 1; } else /* offset == 0 */ { gindex = (FT_UInt)( code + delta ) & 0xFFFFU; if ( gindex != 0 ) { result = code; goto Exit; } code++; } } #else /* old code -- kept for reference */ for ( ;; ) { FT_UInt offset, n; FT_Int delta; FT_Byte* q; p = table + 14; /* ends table */ q = table + 16 + num_segs2; /* starts table */ for ( n = 0; n < num_segs2; n += 2 ) { FT_UInt end = TT_NEXT_USHORT( p ); FT_UInt start = TT_NEXT_USHORT( q ); if ( code < start ) code = start; if ( code <= end ) { p = q + num_segs2 - 2; delta = TT_PEEK_SHORT( p ); p += num_segs2; offset = TT_PEEK_USHORT( p ); if ( offset != 0 && offset != 0xFFFFU ) { /* parse the glyph ids array for non-0 index */ p += offset + ( code - start ) * 2; while ( code <= end ) { gindex = TT_NEXT_USHORT( p ); if ( gindex != 0 ) { gindex = (FT_UInt)( gindex + delta ) & 0xFFFFU; if ( gindex != 0 ) break; } code++; } } else if ( offset == 0xFFFFU ) { /* an offset of 0xFFFF means an empty glyph in certain fonts! */ code = end; break; } else gindex = (FT_UInt)( code + delta ) & 0xFFFFU; if ( gindex == 0 ) break; result = code; goto Exit; } } /* loop to next trial charcode */ if ( code >= 0xFFFFU ) break; code++; } #endif /* !1 */ Exit: *pchar_code = result; return gindex; } FT_CALLBACK_DEF( FT_Error ) tt_cmap4_get_info( TT_CMap cmap, TT_CMapInfo *cmap_info ) { FT_Byte* p = cmap->data + 4; cmap_info->language = (FT_ULong)TT_PEEK_USHORT( p ); return FT_Err_Ok; } FT_CALLBACK_TABLE_DEF const TT_CMap_ClassRec tt_cmap4_class_rec = { { sizeof ( TT_CMapRec ), (FT_CMap_InitFunc) tt_cmap_init, (FT_CMap_DoneFunc) NULL, (FT_CMap_CharIndexFunc)tt_cmap4_char_index, (FT_CMap_CharNextFunc) tt_cmap4_char_next }, 4, (TT_CMap_ValidateFunc) tt_cmap4_validate, (TT_CMap_Info_GetFunc) tt_cmap4_get_info }; #endif /* TT_CONFIG_CMAP_FORMAT_4 */ /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** FORMAT 6 *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /* */ /* TABLE OVERVIEW */ /* -------------- */ /* */ /* NAME OFFSET TYPE DESCRIPTION */ /* */ /* format 0 USHORT must be 4 */ /* length 2 USHORT table length in bytes */ /* language 4 USHORT Mac language code */ /* */ /* first 6 USHORT first segment code */ /* count 8 USHORT segment size in chars */ /* glyphIds 10 USHORT[count] glyph ids */ /* */ /* A very simplified segment mapping. */ /* */ #ifdef TT_CONFIG_CMAP_FORMAT_6 FT_CALLBACK_DEF( void ) tt_cmap6_validate( FT_Byte* table, FT_Validator valid ) { FT_Byte* p; FT_UInt length, count; if ( table + 10 > valid->limit ) FT_INVALID_TOO_SHORT; p = table + 2; length = TT_NEXT_USHORT( p ); p = table + 8; /* skip language and start index */ count = TT_NEXT_USHORT( p ); if ( table + length > valid->limit || length < 10 + count * 2 ) FT_INVALID_TOO_SHORT; /* check glyph indices */ if ( valid->level >= FT_VALIDATE_TIGHT ) { FT_UInt gindex; for ( ; count > 0; count-- ) { gindex = TT_NEXT_USHORT( p ); if ( gindex >= TT_VALID_GLYPH_COUNT( valid ) ) FT_INVALID_GLYPH_ID; } } } FT_CALLBACK_DEF( FT_UInt ) tt_cmap6_char_index( TT_CMap cmap, FT_UInt32 char_code ) { FT_Byte* table = cmap->data; FT_UInt result = 0; FT_Byte* p = table + 6; FT_UInt start = TT_NEXT_USHORT( p ); FT_UInt count = TT_NEXT_USHORT( p ); FT_UInt idx = (FT_UInt)( char_code - start ); if ( idx < count ) { p += 2 * idx; result = TT_PEEK_USHORT( p ); } return result; } FT_CALLBACK_DEF( FT_UInt ) tt_cmap6_char_next( TT_CMap cmap, FT_UInt32 *pchar_code ) { FT_Byte* table = cmap->data; FT_UInt32 result = 0; FT_UInt32 char_code = *pchar_code + 1; FT_UInt gindex = 0; FT_Byte* p = table + 6; FT_UInt start = TT_NEXT_USHORT( p ); FT_UInt count = TT_NEXT_USHORT( p ); FT_UInt idx; if ( char_code >= 0x10000UL ) goto Exit; if ( char_code < start ) char_code = start; idx = (FT_UInt)( char_code - start ); p += 2 * idx; for ( ; idx < count; idx++ ) { gindex = TT_NEXT_USHORT( p ); if ( gindex != 0 ) { result = char_code; break; } char_code++; } Exit: *pchar_code = result; return gindex; } FT_CALLBACK_DEF( FT_Error ) tt_cmap6_get_info( TT_CMap cmap, TT_CMapInfo *cmap_info ) { FT_Byte* p = cmap->data + 4; cmap_info->language = (FT_ULong)TT_PEEK_USHORT( p ); return FT_Err_Ok; } FT_CALLBACK_TABLE_DEF const TT_CMap_ClassRec tt_cmap6_class_rec = { { sizeof ( TT_CMapRec ), (FT_CMap_InitFunc) tt_cmap_init, (FT_CMap_DoneFunc) NULL, (FT_CMap_CharIndexFunc)tt_cmap6_char_index, (FT_CMap_CharNextFunc) tt_cmap6_char_next }, 6, (TT_CMap_ValidateFunc) tt_cmap6_validate, (TT_CMap_Info_GetFunc) tt_cmap6_get_info }; #endif /* TT_CONFIG_CMAP_FORMAT_6 */ /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** FORMAT 8 *****/ /***** *****/ /***** It's hard to completely understand what the OpenType spec *****/ /***** says about this format, but here is my conclusion. *****/ /***** *****/ /***** The purpose of this format is to easily map UTF-16 text to *****/ /***** glyph indices. Basically, the `char_code' must be in one of *****/ /***** the following formats: *****/ /***** *****/ /***** - A 16-bit value that isn't part of the Unicode Surrogates *****/ /***** Area (i.e. U+D800-U+DFFF). *****/ /***** *****/ /***** - A 32-bit value, made of two surrogate values, i.e.. if *****/ /***** `char_code = (char_hi << 16) | char_lo', then both *****/ /***** `char_hi' and `char_lo' must be in the Surrogates Area. *****/ /***** Area. *****/ /***** *****/ /***** The 'is32' table embedded in the charmap indicates whether a *****/ /***** given 16-bit value is in the surrogates area or not. *****/ /***** *****/ /***** So, for any given `char_code', we can assert the following: *****/ /***** *****/ /***** If `char_hi == 0' then we must have `is32[char_lo] == 0'. *****/ /***** *****/ /***** If `char_hi != 0' then we must have both *****/ /***** `is32[char_hi] != 0' and `is32[char_lo] != 0'. *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /* */ /* TABLE OVERVIEW */ /* -------------- */ /* */ /* NAME OFFSET TYPE DESCRIPTION */ /* */ /* format 0 USHORT must be 8 */ /* reseved 2 USHORT reserved */ /* length 4 ULONG length in bytes */ /* language 8 ULONG Mac language code */ /* is32 12 BYTE[8192] 32-bitness bitmap */ /* count 8204 ULONG number of groups */ /* */ /* This header is followed by 'count' groups of the following format: */ /* */ /* start 0 ULONG first charcode */ /* end 4 ULONG last charcode */ /* startId 8 ULONG start glyph id for the group */ /* */ #ifdef TT_CONFIG_CMAP_FORMAT_8 FT_CALLBACK_DEF( void ) tt_cmap8_validate( FT_Byte* table, FT_Validator valid ) { FT_Byte* p = table + 4; FT_Byte* is32; FT_UInt32 length; FT_UInt32 num_groups; if ( table + 16 + 8192 > valid->limit ) FT_INVALID_TOO_SHORT; length = TT_NEXT_ULONG( p ); if ( table + length > valid->limit || length < 8208 ) FT_INVALID_TOO_SHORT; is32 = table + 12; p = is32 + 8192; /* skip `is32' array */ num_groups = TT_NEXT_ULONG( p ); if ( p + num_groups * 12 > valid->limit ) FT_INVALID_TOO_SHORT; /* check groups, they must be in increasing order */ { FT_UInt32 n, start, end, start_id, count, last = 0; for ( n = 0; n < num_groups; n++ ) { FT_UInt hi, lo; start = TT_NEXT_ULONG( p ); end = TT_NEXT_ULONG( p ); start_id = TT_NEXT_ULONG( p ); if ( start > end ) FT_INVALID_DATA; if ( n > 0 && start <= last ) FT_INVALID_DATA; if ( valid->level >= FT_VALIDATE_TIGHT ) { if ( start_id + end - start >= TT_VALID_GLYPH_COUNT( valid ) ) FT_INVALID_GLYPH_ID; count = (FT_UInt32)( end - start + 1 ); if ( start & ~0xFFFFU ) { /* start_hi != 0; check that is32[i] is 1 for each i in */ /* the `hi' and `lo' of the range [start..end] */ for ( ; count > 0; count--, start++ ) { hi = (FT_UInt)( start >> 16 ); lo = (FT_UInt)( start & 0xFFFFU ); if ( (is32[hi >> 3] & ( 0x80 >> ( hi & 7 ) ) ) == 0 ) FT_INVALID_DATA; if ( (is32[lo >> 3] & ( 0x80 >> ( lo & 7 ) ) ) == 0 ) FT_INVALID_DATA; } } else { /* start_hi == 0; check that is32[i] is 0 for each i in */ /* the range [start..end] */ /* end_hi cannot be != 0! */ if ( end & ~0xFFFFU ) FT_INVALID_DATA; for ( ; count > 0; count--, start++ ) { lo = (FT_UInt)( start & 0xFFFFU ); if ( (is32[lo >> 3] & ( 0x80 >> ( lo & 7 ) ) ) != 0 ) FT_INVALID_DATA; } } } last = end; } } } FT_CALLBACK_DEF( FT_UInt ) tt_cmap8_char_index( TT_CMap cmap, FT_UInt32 char_code ) { FT_Byte* table = cmap->data; FT_UInt result = 0; FT_Byte* p = table + 8204; FT_UInt32 num_groups = TT_NEXT_ULONG( p ); FT_UInt32 start, end, start_id; for ( ; num_groups > 0; num_groups-- ) { start = TT_NEXT_ULONG( p ); end = TT_NEXT_ULONG( p ); start_id = TT_NEXT_ULONG( p ); if ( char_code < start ) break; if ( char_code <= end ) { result = (FT_UInt)( start_id + char_code - start ); break; } } return result; } FT_CALLBACK_DEF( FT_UInt ) tt_cmap8_char_next( TT_CMap cmap, FT_UInt32 *pchar_code ) { FT_UInt32 result = 0; FT_UInt32 char_code = *pchar_code + 1; FT_UInt gindex = 0; FT_Byte* table = cmap->data; FT_Byte* p = table + 8204; FT_UInt32 num_groups = TT_NEXT_ULONG( p ); FT_UInt32 start, end, start_id; p = table + 8208; for ( ; num_groups > 0; num_groups-- ) { start = TT_NEXT_ULONG( p ); end = TT_NEXT_ULONG( p ); start_id = TT_NEXT_ULONG( p ); if ( char_code < start ) char_code = start; if ( char_code <= end ) { gindex = (FT_UInt)( char_code - start + start_id ); if ( gindex != 0 ) { result = char_code; goto Exit; } } } Exit: *pchar_code = result; return gindex; } FT_CALLBACK_DEF( FT_Error ) tt_cmap8_get_info( TT_CMap cmap, TT_CMapInfo *cmap_info ) { FT_Byte* p = cmap->data + 8; cmap_info->language = (FT_ULong)TT_PEEK_ULONG( p ); return FT_Err_Ok; } FT_CALLBACK_TABLE_DEF const TT_CMap_ClassRec tt_cmap8_class_rec = { { sizeof ( TT_CMapRec ), (FT_CMap_InitFunc) tt_cmap_init, (FT_CMap_DoneFunc) NULL, (FT_CMap_CharIndexFunc)tt_cmap8_char_index, (FT_CMap_CharNextFunc) tt_cmap8_char_next }, 8, (TT_CMap_ValidateFunc) tt_cmap8_validate, (TT_CMap_Info_GetFunc) tt_cmap8_get_info }; #endif /* TT_CONFIG_CMAP_FORMAT_8 */ /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** FORMAT 10 *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /* */ /* TABLE OVERVIEW */ /* -------------- */ /* */ /* NAME OFFSET TYPE DESCRIPTION */ /* */ /* format 0 USHORT must be 10 */ /* reserved 2 USHORT reserved */ /* length 4 ULONG length in bytes */ /* language 8 ULONG Mac language code */ /* */ /* start 12 ULONG first char in range */ /* count 16 ULONG number of chars in range */ /* glyphIds 20 USHORT[count] glyph indices covered */ /* */ #ifdef TT_CONFIG_CMAP_FORMAT_10 FT_CALLBACK_DEF( void ) tt_cmap10_validate( FT_Byte* table, FT_Validator valid ) { FT_Byte* p = table + 4; FT_ULong length, count; if ( table + 20 > valid->limit ) FT_INVALID_TOO_SHORT; length = TT_NEXT_ULONG( p ); p = table + 16; count = TT_NEXT_ULONG( p ); if ( table + length > valid->limit || length < 20 + count * 2 ) FT_INVALID_TOO_SHORT; /* check glyph indices */ if ( valid->level >= FT_VALIDATE_TIGHT ) { FT_UInt gindex; for ( ; count > 0; count-- ) { gindex = TT_NEXT_USHORT( p ); if ( gindex >= TT_VALID_GLYPH_COUNT( valid ) ) FT_INVALID_GLYPH_ID; } } } FT_CALLBACK_DEF( FT_UInt ) tt_cmap10_char_index( TT_CMap cmap, FT_UInt32 char_code ) { FT_Byte* table = cmap->data; FT_UInt result = 0; FT_Byte* p = table + 12; FT_UInt32 start = TT_NEXT_ULONG( p ); FT_UInt32 count = TT_NEXT_ULONG( p ); FT_UInt32 idx = (FT_ULong)( char_code - start ); if ( idx < count ) { p += 2 * idx; result = TT_PEEK_USHORT( p ); } return result; } FT_CALLBACK_DEF( FT_UInt ) tt_cmap10_char_next( TT_CMap cmap, FT_UInt32 *pchar_code ) { FT_Byte* table = cmap->data; FT_UInt32 char_code = *pchar_code + 1; FT_UInt gindex = 0; FT_Byte* p = table + 12; FT_UInt32 start = TT_NEXT_ULONG( p ); FT_UInt32 count = TT_NEXT_ULONG( p ); FT_UInt32 idx; if ( char_code < start ) char_code = start; idx = (FT_UInt32)( char_code - start ); p += 2 * idx; for ( ; idx < count; idx++ ) { gindex = TT_NEXT_USHORT( p ); if ( gindex != 0 ) break; char_code++; } *pchar_code = char_code; return gindex; } FT_CALLBACK_DEF( FT_Error ) tt_cmap10_get_info( TT_CMap cmap, TT_CMapInfo *cmap_info ) { FT_Byte* p = cmap->data + 8; cmap_info->language = (FT_ULong)TT_PEEK_ULONG( p ); return FT_Err_Ok; } FT_CALLBACK_TABLE_DEF const TT_CMap_ClassRec tt_cmap10_class_rec = { { sizeof ( TT_CMapRec ), (FT_CMap_InitFunc) tt_cmap_init, (FT_CMap_DoneFunc) NULL, (FT_CMap_CharIndexFunc)tt_cmap10_char_index, (FT_CMap_CharNextFunc) tt_cmap10_char_next }, 10, (TT_CMap_ValidateFunc) tt_cmap10_validate, (TT_CMap_Info_GetFunc) tt_cmap10_get_info }; #endif /* TT_CONFIG_CMAP_FORMAT_10 */ /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** FORMAT 12 *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /* */ /* TABLE OVERVIEW */ /* -------------- */ /* */ /* NAME OFFSET TYPE DESCRIPTION */ /* */ /* format 0 USHORT must be 12 */ /* reserved 2 USHORT reserved */ /* length 4 ULONG length in bytes */ /* language 8 ULONG Mac language code */ /* count 12 ULONG number of groups */ /* 16 */ /* */ /* This header is followed by `count' groups of the following format: */ /* */ /* start 0 ULONG first charcode */ /* end 4 ULONG last charcode */ /* startId 8 ULONG start glyph id for the group */ /* */ #ifdef TT_CONFIG_CMAP_FORMAT_12 FT_CALLBACK_DEF( void ) tt_cmap12_validate( FT_Byte* table, FT_Validator valid ) { FT_Byte* p; FT_ULong length; FT_ULong num_groups; if ( table + 16 > valid->limit ) FT_INVALID_TOO_SHORT; p = table + 4; length = TT_NEXT_ULONG( p ); p = table + 12; num_groups = TT_NEXT_ULONG( p ); if ( table + length > valid->limit || length < 16 + 12 * num_groups ) FT_INVALID_TOO_SHORT; /* check groups, they must be in increasing order */ { FT_ULong n, start, end, start_id, last = 0; for ( n = 0; n < num_groups; n++ ) { start = TT_NEXT_ULONG( p ); end = TT_NEXT_ULONG( p ); start_id = TT_NEXT_ULONG( p ); if ( start > end ) FT_INVALID_DATA; if ( n > 0 && start <= last ) FT_INVALID_DATA; if ( valid->level >= FT_VALIDATE_TIGHT ) { if ( start_id + end - start >= TT_VALID_GLYPH_COUNT( valid ) ) FT_INVALID_GLYPH_ID; } last = end; } } } FT_CALLBACK_DEF( FT_UInt ) tt_cmap12_char_index( TT_CMap cmap, FT_UInt32 char_code ) { FT_UInt result = 0; FT_Byte* table = cmap->data; FT_Byte* p = table + 12; FT_UInt32 num_groups = TT_NEXT_ULONG( p ); FT_UInt32 start, end, start_id; for ( ; num_groups > 0; num_groups-- ) { start = TT_NEXT_ULONG( p ); end = TT_NEXT_ULONG( p ); start_id = TT_NEXT_ULONG( p ); if ( char_code < start ) break; if ( char_code <= end ) { result = (FT_UInt)( start_id + char_code - start ); break; } } return result; } FT_CALLBACK_DEF( FT_UInt ) tt_cmap12_char_next( TT_CMap cmap, FT_UInt32 *pchar_code ) { FT_Byte* table = cmap->data; FT_UInt32 result = 0; FT_UInt32 char_code = *pchar_code + 1; FT_UInt gindex = 0; FT_Byte* p = table + 12; FT_UInt32 num_groups = TT_NEXT_ULONG( p ); FT_UInt32 start, end, start_id; p = table + 16; for ( ; num_groups > 0; num_groups-- ) { start = TT_NEXT_ULONG( p ); end = TT_NEXT_ULONG( p ); start_id = TT_NEXT_ULONG( p ); if ( char_code < start ) char_code = start; if ( char_code <= end ) { gindex = (FT_UInt)(char_code - start + start_id); if ( gindex != 0 ) { result = char_code; goto Exit; } } } Exit: *pchar_code = result; return gindex; } FT_CALLBACK_DEF( FT_Error ) tt_cmap12_get_info( TT_CMap cmap, TT_CMapInfo *cmap_info ) { FT_Byte* p = cmap->data + 8; cmap_info->language = (FT_ULong)TT_PEEK_ULONG( p ); return FT_Err_Ok; } FT_CALLBACK_TABLE_DEF const TT_CMap_ClassRec tt_cmap12_class_rec = { { sizeof ( TT_CMapRec ), (FT_CMap_InitFunc) tt_cmap_init, (FT_CMap_DoneFunc) NULL, (FT_CMap_CharIndexFunc)tt_cmap12_char_index, (FT_CMap_CharNextFunc) tt_cmap12_char_next }, 12, (TT_CMap_ValidateFunc) tt_cmap12_validate, (TT_CMap_Info_GetFunc) tt_cmap12_get_info }; #endif /* TT_CONFIG_CMAP_FORMAT_12 */ static const TT_CMap_Class tt_cmap_classes[] = { #ifdef TT_CONFIG_CMAP_FORMAT_0 &tt_cmap0_class_rec, #endif #ifdef TT_CONFIG_CMAP_FORMAT_2 &tt_cmap2_class_rec, #endif #ifdef TT_CONFIG_CMAP_FORMAT_4 &tt_cmap4_class_rec, #endif #ifdef TT_CONFIG_CMAP_FORMAT_6 &tt_cmap6_class_rec, #endif #ifdef TT_CONFIG_CMAP_FORMAT_8 &tt_cmap8_class_rec, #endif #ifdef TT_CONFIG_CMAP_FORMAT_10 &tt_cmap10_class_rec, #endif #ifdef TT_CONFIG_CMAP_FORMAT_12 &tt_cmap12_class_rec, #endif NULL, }; /* parse the `cmap' table and build the corresponding TT_CMap objects */ /* in the current face */ /* */ FT_LOCAL_DEF( FT_Error ) tt_face_build_cmaps( TT_Face face ) { FT_Byte* table = face->cmap_table; FT_Byte* limit = table + face->cmap_size; FT_UInt volatile num_cmaps; FT_Byte* volatile p = table; if ( p + 4 > limit ) return SFNT_Err_Invalid_Table; /* only recognize format 0 */ if ( TT_NEXT_USHORT( p ) != 0 ) { p -= 2; FT_ERROR(( "tt_face_build_cmaps: unsupported `cmap' table format = %d\n", TT_PEEK_USHORT( p ) )); return SFNT_Err_Invalid_Table; } num_cmaps = TT_NEXT_USHORT( p ); for ( ; num_cmaps > 0 && p + 8 <= limit; num_cmaps-- ) { FT_CharMapRec charmap; FT_UInt32 offset; charmap.platform_id = TT_NEXT_USHORT( p ); charmap.encoding_id = TT_NEXT_USHORT( p ); charmap.face = FT_FACE( face ); charmap.encoding = FT_ENCODING_NONE; /* will be filled later */ offset = TT_NEXT_ULONG( p ); if ( offset && table + offset + 2 < limit ) { FT_Byte* cmap = table + offset; volatile FT_UInt format = TT_PEEK_USHORT( cmap ); const TT_CMap_Class* volatile pclazz = tt_cmap_classes; TT_CMap_Class clazz; for ( ; *pclazz; pclazz++ ) { clazz = *pclazz; if ( clazz->format == format ) { volatile TT_ValidatorRec valid; ft_validator_init( FT_VALIDATOR( &valid ), cmap, limit, FT_VALIDATE_DEFAULT ); valid.num_glyphs = (FT_UInt)face->root.num_glyphs; if ( ft_setjmp( FT_VALIDATOR( &valid )->jump_buffer ) == 0 ) { /* validate this cmap sub-table */ clazz->validate( cmap, FT_VALIDATOR( &valid ) ); } if ( valid.validator.error == 0 ) (void)FT_CMap_New( (FT_CMap_Class)clazz, cmap, &charmap, NULL ); else { FT_ERROR(( "tt_face_build_cmaps:" )); FT_ERROR(( " broken cmap sub-table ignored!\n" )); } break; } } } } return 0; } FT_LOCAL( FT_Error ) tt_get_cmap_info( FT_CharMap charmap, TT_CMapInfo *cmap_info ) { FT_CMap cmap = (FT_CMap)charmap; TT_CMap_Class clazz = (TT_CMap_Class)cmap->clazz; return clazz->get_cmap_info( charmap, cmap_info ); } /* END */