1 /***************************************************************************/ 2 /* */ 3 /* psmodule.c */ 4 /* */ 5 /* PSNames module implementation (body). */ 6 /* */ 7 /* Copyright 1996-2018 by */ 8 /* David Turner, Robert Wilhelm, and Werner Lemberg. */ 9 /* */ 10 /* This file is part of the FreeType project, and may only be used, */ 11 /* modified, and distributed under the terms of the FreeType project */ 12 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ 13 /* this file you indicate that you have read the license and */ 14 /* understand and accept it fully. */ 15 /* */ 16 /***************************************************************************/ 17 18 19 #include <ft2build.h> 20 #include FT_INTERNAL_DEBUG_H 21 #include FT_INTERNAL_OBJECTS_H 22 #include FT_SERVICE_POSTSCRIPT_CMAPS_H 23 24 #include "psmodule.h" 25 26 /* 27 * The file `pstables.h' with its arrays and its function 28 * `ft_get_adobe_glyph_index' is useful for other projects also (for 29 * example, `pdfium' is using it). However, if used as a C++ header, 30 * including it in two different source files makes it necessary to use 31 * `extern const' for the declaration of its arrays, otherwise the data 32 * would be duplicated as mandated by the C++ standard. 33 * 34 * For this reason, we use `DEFINE_PS_TABLES' to guard the function 35 * definitions, and `DEFINE_PS_TABLES_DATA' to provide both proper array 36 * declarations and definitions. 37 */ 38 #include "pstables.h" 39 #define DEFINE_PS_TABLES 40 #define DEFINE_PS_TABLES_DATA 41 #include "pstables.h" 42 43 #include "psnamerr.h" 44 #include "pspic.h" 45 46 47 #ifdef FT_CONFIG_OPTION_POSTSCRIPT_NAMES 48 49 50 #ifdef FT_CONFIG_OPTION_ADOBE_GLYPH_LIST 51 52 53 #define VARIANT_BIT 0x80000000UL 54 #define BASE_GLYPH( code ) ( (FT_UInt32)( (code) & ~VARIANT_BIT ) ) 55 56 57 /* Return the Unicode value corresponding to a given glyph. Note that */ 58 /* we do deal with glyph variants by detecting a non-initial dot in */ 59 /* the name, as in `A.swash' or `e.final'; in this case, the */ 60 /* VARIANT_BIT is set in the return value. */ 61 /* */ 62 static FT_UInt32 63 ps_unicode_value( const char* glyph_name ) 64 { 65 /* If the name begins with `uni', then the glyph name may be a */ 66 /* hard-coded unicode character code. */ 67 if ( glyph_name[0] == 'u' && 68 glyph_name[1] == 'n' && 69 glyph_name[2] == 'i' ) 70 { 71 /* determine whether the next four characters following are */ 72 /* hexadecimal. */ 73 74 /* XXX: Add code to deal with ligatures, i.e. glyph names like */ 75 /* `uniXXXXYYYYZZZZ'... */ 76 77 FT_Int count; 78 FT_UInt32 value = 0; 79 const char* p = glyph_name + 3; 80 81 82 for ( count = 4; count > 0; count--, p++ ) 83 { 84 char c = *p; 85 unsigned int d; 86 87 88 d = (unsigned char)c - '0'; 89 if ( d >= 10 ) 90 { 91 d = (unsigned char)c - 'A'; 92 if ( d >= 6 ) 93 d = 16; 94 else 95 d += 10; 96 } 97 98 /* Exit if a non-uppercase hexadecimal character was found */ 99 /* -- this also catches character codes below `0' since such */ 100 /* negative numbers cast to `unsigned int' are far too big. */ 101 if ( d >= 16 ) 102 break; 103 104 value = ( value << 4 ) + d; 105 } 106 107 /* there must be exactly four hex digits */ 108 if ( count == 0 ) 109 { 110 if ( *p == '\0' ) 111 return value; 112 if ( *p == '.' ) 113 return (FT_UInt32)( value | VARIANT_BIT ); 114 } 115 } 116 117 /* If the name begins with `u', followed by four to six uppercase */ 118 /* hexadecimal digits, it is a hard-coded unicode character code. */ 119 if ( glyph_name[0] == 'u' ) 120 { 121 FT_Int count; 122 FT_UInt32 value = 0; 123 const char* p = glyph_name + 1; 124 125 126 for ( count = 6; count > 0; count--, p++ ) 127 { 128 char c = *p; 129 unsigned int d; 130 131 132 d = (unsigned char)c - '0'; 133 if ( d >= 10 ) 134 { 135 d = (unsigned char)c - 'A'; 136 if ( d >= 6 ) 137 d = 16; 138 else 139 d += 10; 140 } 141 142 if ( d >= 16 ) 143 break; 144 145 value = ( value << 4 ) + d; 146 } 147 148 if ( count <= 2 ) 149 { 150 if ( *p == '\0' ) 151 return value; 152 if ( *p == '.' ) 153 return (FT_UInt32)( value | VARIANT_BIT ); 154 } 155 } 156 157 /* Look for a non-initial dot in the glyph name in order to */ 158 /* find variants like `A.swash', `e.final', etc. */ 159 { 160 const char* p = glyph_name; 161 const char* dot = NULL; 162 163 164 for ( ; *p; p++ ) 165 { 166 if ( *p == '.' && p > glyph_name ) 167 { 168 dot = p; 169 break; 170 } 171 } 172 173 /* now look up the glyph in the Adobe Glyph List */ 174 if ( !dot ) 175 return (FT_UInt32)ft_get_adobe_glyph_index( glyph_name, p ); 176 else 177 return (FT_UInt32)( ft_get_adobe_glyph_index( glyph_name, dot ) | 178 VARIANT_BIT ); 179 } 180 } 181 182 183 /* ft_qsort callback to sort the unicode map */ 184 FT_CALLBACK_DEF( int ) 185 compare_uni_maps( const void* a, 186 const void* b ) 187 { 188 PS_UniMap* map1 = (PS_UniMap*)a; 189 PS_UniMap* map2 = (PS_UniMap*)b; 190 FT_UInt32 unicode1 = BASE_GLYPH( map1->unicode ); 191 FT_UInt32 unicode2 = BASE_GLYPH( map2->unicode ); 192 193 194 /* sort base glyphs before glyph variants */ 195 if ( unicode1 == unicode2 ) 196 { 197 if ( map1->unicode > map2->unicode ) 198 return 1; 199 else if ( map1->unicode < map2->unicode ) 200 return -1; 201 else 202 return 0; 203 } 204 else 205 { 206 if ( unicode1 > unicode2 ) 207 return 1; 208 else if ( unicode1 < unicode2 ) 209 return -1; 210 else 211 return 0; 212 } 213 } 214 215 216 /* support for extra glyphs not handled (well) in AGL; */ 217 /* we add extra mappings for them if necessary */ 218 219 #define EXTRA_GLYPH_LIST_SIZE 10 220 221 static const FT_UInt32 ft_extra_glyph_unicodes[EXTRA_GLYPH_LIST_SIZE] = 222 { 223 /* WGL 4 */ 224 0x0394, 225 0x03A9, 226 0x2215, 227 0x00AD, 228 0x02C9, 229 0x03BC, 230 0x2219, 231 0x00A0, 232 /* Romanian */ 233 0x021A, 234 0x021B 235 }; 236 237 static const char ft_extra_glyph_names[] = 238 { 239 'D','e','l','t','a',0, 240 'O','m','e','g','a',0, 241 'f','r','a','c','t','i','o','n',0, 242 'h','y','p','h','e','n',0, 243 'm','a','c','r','o','n',0, 244 'm','u',0, 245 'p','e','r','i','o','d','c','e','n','t','e','r','e','d',0, 246 's','p','a','c','e',0, 247 'T','c','o','m','m','a','a','c','c','e','n','t',0, 248 't','c','o','m','m','a','a','c','c','e','n','t',0 249 }; 250 251 static const FT_Int 252 ft_extra_glyph_name_offsets[EXTRA_GLYPH_LIST_SIZE] = 253 { 254 0, 255 6, 256 12, 257 21, 258 28, 259 35, 260 38, 261 53, 262 59, 263 72 264 }; 265 266 267 static void 268 ps_check_extra_glyph_name( const char* gname, 269 FT_UInt glyph, 270 FT_UInt* extra_glyphs, 271 FT_UInt *states ) 272 { 273 FT_UInt n; 274 275 276 for ( n = 0; n < EXTRA_GLYPH_LIST_SIZE; n++ ) 277 { 278 if ( ft_strcmp( ft_extra_glyph_names + 279 ft_extra_glyph_name_offsets[n], gname ) == 0 ) 280 { 281 if ( states[n] == 0 ) 282 { 283 /* mark this extra glyph as a candidate for the cmap */ 284 states[n] = 1; 285 extra_glyphs[n] = glyph; 286 } 287 288 return; 289 } 290 } 291 } 292 293 294 static void 295 ps_check_extra_glyph_unicode( FT_UInt32 uni_char, 296 FT_UInt *states ) 297 { 298 FT_UInt n; 299 300 301 for ( n = 0; n < EXTRA_GLYPH_LIST_SIZE; n++ ) 302 { 303 if ( uni_char == ft_extra_glyph_unicodes[n] ) 304 { 305 /* disable this extra glyph from being added to the cmap */ 306 states[n] = 2; 307 308 return; 309 } 310 } 311 } 312 313 314 /* Build a table that maps Unicode values to glyph indices. */ 315 static FT_Error 316 ps_unicodes_init( FT_Memory memory, 317 PS_Unicodes table, 318 FT_UInt num_glyphs, 319 PS_GetGlyphNameFunc get_glyph_name, 320 PS_FreeGlyphNameFunc free_glyph_name, 321 FT_Pointer glyph_data ) 322 { 323 FT_Error error; 324 325 FT_UInt extra_glyph_list_states[] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; 326 FT_UInt extra_glyphs[EXTRA_GLYPH_LIST_SIZE]; 327 328 329 /* we first allocate the table */ 330 table->num_maps = 0; 331 table->maps = NULL; 332 333 if ( !FT_NEW_ARRAY( table->maps, num_glyphs + EXTRA_GLYPH_LIST_SIZE ) ) 334 { 335 FT_UInt n; 336 FT_UInt count; 337 PS_UniMap* map; 338 FT_UInt32 uni_char; 339 340 341 map = table->maps; 342 343 for ( n = 0; n < num_glyphs; n++ ) 344 { 345 const char* gname = get_glyph_name( glyph_data, n ); 346 347 348 if ( gname ) 349 { 350 ps_check_extra_glyph_name( gname, n, 351 extra_glyphs, extra_glyph_list_states ); 352 uni_char = ps_unicode_value( gname ); 353 354 if ( BASE_GLYPH( uni_char ) != 0 ) 355 { 356 ps_check_extra_glyph_unicode( uni_char, 357 extra_glyph_list_states ); 358 map->unicode = uni_char; 359 map->glyph_index = n; 360 map++; 361 } 362 363 if ( free_glyph_name ) 364 free_glyph_name( glyph_data, gname ); 365 } 366 } 367 368 for ( n = 0; n < EXTRA_GLYPH_LIST_SIZE; n++ ) 369 { 370 if ( extra_glyph_list_states[n] == 1 ) 371 { 372 /* This glyph name has an additional representation. */ 373 /* Add it to the cmap. */ 374 375 map->unicode = ft_extra_glyph_unicodes[n]; 376 map->glyph_index = extra_glyphs[n]; 377 map++; 378 } 379 } 380 381 /* now compress the table a bit */ 382 count = (FT_UInt)( map - table->maps ); 383 384 if ( count == 0 ) 385 { 386 /* No unicode chars here! */ 387 FT_FREE( table->maps ); 388 if ( !error ) 389 error = FT_THROW( No_Unicode_Glyph_Name ); 390 } 391 else 392 { 393 /* Reallocate if the number of used entries is much smaller. */ 394 if ( count < num_glyphs / 2 ) 395 { 396 (void)FT_RENEW_ARRAY( table->maps, num_glyphs, count ); 397 error = FT_Err_Ok; 398 } 399 400 /* Sort the table in increasing order of unicode values, */ 401 /* taking care of glyph variants. */ 402 ft_qsort( table->maps, count, sizeof ( PS_UniMap ), 403 compare_uni_maps ); 404 } 405 406 table->num_maps = count; 407 } 408 409 return error; 410 } 411 412 413 static FT_UInt 414 ps_unicodes_char_index( PS_Unicodes table, 415 FT_UInt32 unicode ) 416 { 417 PS_UniMap *min, *max, *mid, *result = NULL; 418 419 420 /* Perform a binary search on the table. */ 421 422 min = table->maps; 423 max = min + table->num_maps - 1; 424 425 while ( min <= max ) 426 { 427 FT_UInt32 base_glyph; 428 429 430 mid = min + ( ( max - min ) >> 1 ); 431 432 if ( mid->unicode == unicode ) 433 { 434 result = mid; 435 break; 436 } 437 438 base_glyph = BASE_GLYPH( mid->unicode ); 439 440 if ( base_glyph == unicode ) 441 result = mid; /* remember match but continue search for base glyph */ 442 443 if ( min == max ) 444 break; 445 446 if ( base_glyph < unicode ) 447 min = mid + 1; 448 else 449 max = mid - 1; 450 } 451 452 if ( result ) 453 return result->glyph_index; 454 else 455 return 0; 456 } 457 458 459 static FT_UInt32 460 ps_unicodes_char_next( PS_Unicodes table, 461 FT_UInt32 *unicode ) 462 { 463 FT_UInt result = 0; 464 FT_UInt32 char_code = *unicode + 1; 465 466 467 { 468 FT_UInt min = 0; 469 FT_UInt max = table->num_maps; 470 FT_UInt mid; 471 PS_UniMap* map; 472 FT_UInt32 base_glyph; 473 474 475 while ( min < max ) 476 { 477 mid = min + ( ( max - min ) >> 1 ); 478 map = table->maps + mid; 479 480 if ( map->unicode == char_code ) 481 { 482 result = map->glyph_index; 483 goto Exit; 484 } 485 486 base_glyph = BASE_GLYPH( map->unicode ); 487 488 if ( base_glyph == char_code ) 489 result = map->glyph_index; 490 491 if ( base_glyph < char_code ) 492 min = mid + 1; 493 else 494 max = mid; 495 } 496 497 if ( result ) 498 goto Exit; /* we have a variant glyph */ 499 500 /* we didn't find it; check whether we have a map just above it */ 501 char_code = 0; 502 503 if ( min < table->num_maps ) 504 { 505 map = table->maps + min; 506 result = map->glyph_index; 507 char_code = BASE_GLYPH( map->unicode ); 508 } 509 } 510 511 Exit: 512 *unicode = char_code; 513 return result; 514 } 515 516 517 #endif /* FT_CONFIG_OPTION_ADOBE_GLYPH_LIST */ 518 519 520 static const char* 521 ps_get_macintosh_name( FT_UInt name_index ) 522 { 523 if ( name_index >= FT_NUM_MAC_NAMES ) 524 name_index = 0; 525 526 return ft_standard_glyph_names + ft_mac_names[name_index]; 527 } 528 529 530 static const char* 531 ps_get_standard_strings( FT_UInt sid ) 532 { 533 if ( sid >= FT_NUM_SID_NAMES ) 534 return 0; 535 536 return ft_standard_glyph_names + ft_sid_names[sid]; 537 } 538 539 540 #ifdef FT_CONFIG_OPTION_ADOBE_GLYPH_LIST 541 542 FT_DEFINE_SERVICE_PSCMAPSREC( 543 pscmaps_interface, 544 545 (PS_Unicode_ValueFunc) ps_unicode_value, /* unicode_value */ 546 (PS_Unicodes_InitFunc) ps_unicodes_init, /* unicodes_init */ 547 (PS_Unicodes_CharIndexFunc)ps_unicodes_char_index, /* unicodes_char_index */ 548 (PS_Unicodes_CharNextFunc) ps_unicodes_char_next, /* unicodes_char_next */ 549 550 (PS_Macintosh_NameFunc) ps_get_macintosh_name, /* macintosh_name */ 551 (PS_Adobe_Std_StringsFunc) ps_get_standard_strings, /* adobe_std_strings */ 552 553 t1_standard_encoding, /* adobe_std_encoding */ 554 t1_expert_encoding /* adobe_expert_encoding */ 555 ) 556 557 #else 558 559 FT_DEFINE_SERVICE_PSCMAPSREC( 560 pscmaps_interface, 561 562 NULL, /* unicode_value */ 563 NULL, /* unicodes_init */ 564 NULL, /* unicodes_char_index */ 565 NULL, /* unicodes_char_next */ 566 567 (PS_Macintosh_NameFunc) ps_get_macintosh_name, /* macintosh_name */ 568 (PS_Adobe_Std_StringsFunc) ps_get_standard_strings, /* adobe_std_strings */ 569 570 t1_standard_encoding, /* adobe_std_encoding */ 571 t1_expert_encoding /* adobe_expert_encoding */ 572 ) 573 574 #endif /* FT_CONFIG_OPTION_ADOBE_GLYPH_LIST */ 575 576 577 FT_DEFINE_SERVICEDESCREC1( 578 pscmaps_services, 579 580 FT_SERVICE_ID_POSTSCRIPT_CMAPS, &PSCMAPS_INTERFACE_GET ) 581 582 583 static FT_Pointer 584 psnames_get_service( FT_Module module, 585 const char* service_id ) 586 { 587 /* PSCMAPS_SERVICES_GET dereferences `library' in PIC mode */ 588 #ifdef FT_CONFIG_OPTION_PIC 589 FT_Library library; 590 591 592 if ( !module ) 593 return NULL; 594 library = module->library; 595 if ( !library ) 596 return NULL; 597 #else 598 FT_UNUSED( module ); 599 #endif 600 601 return ft_service_list_lookup( PSCMAPS_SERVICES_GET, service_id ); 602 } 603 604 #endif /* FT_CONFIG_OPTION_POSTSCRIPT_NAMES */ 605 606 607 #ifndef FT_CONFIG_OPTION_POSTSCRIPT_NAMES 608 #define PUT_PS_NAMES_SERVICE( a ) NULL 609 #else 610 #define PUT_PS_NAMES_SERVICE( a ) a 611 #endif 612 613 FT_DEFINE_MODULE( 614 psnames_module_class, 615 616 0, /* this is not a font driver, nor a renderer */ 617 sizeof ( FT_ModuleRec ), 618 619 "psnames", /* driver name */ 620 0x10000L, /* driver version */ 621 0x20000L, /* driver requires FreeType 2 or above */ 622 623 PUT_PS_NAMES_SERVICE( 624 (void*)&PSCMAPS_INTERFACE_GET ), /* module specific interface */ 625 626 (FT_Module_Constructor)NULL, /* module_init */ 627 (FT_Module_Destructor) NULL, /* module_done */ 628 (FT_Module_Requester) PUT_PS_NAMES_SERVICE( psnames_get_service ) /* get_interface */ 629 ) 630 631 632 /* END */ 633
