1 /***************************************************************************/ 2 /* */ 3 /* ttpost.c */ 4 /* */ 5 /* Postcript name table processing for TrueType and OpenType fonts */ 6 /* (body). */ 7 /* */ 8 /* Copyright 1996-2003, 2006-2010, 2013 by */ 9 /* David Turner, Robert Wilhelm, and Werner Lemberg. */ 10 /* */ 11 /* This file is part of the FreeType project, and may only be used, */ 12 /* modified, and distributed under the terms of the FreeType project */ 13 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ 14 /* this file you indicate that you have read the license and */ 15 /* understand and accept it fully. */ 16 /* */ 17 /***************************************************************************/ 18 19 /*************************************************************************/ 20 /* */ 21 /* The post table is not completely loaded by the core engine. This */ 22 /* file loads the missing PS glyph names and implements an API to access */ 23 /* them. */ 24 /* */ 25 /*************************************************************************/ 26 27 28 #include <ft2build.h> 29 #include FT_INTERNAL_DEBUG_H 30 #include FT_INTERNAL_STREAM_H 31 #include FT_TRUETYPE_TAGS_H 32 #include "ttpost.h" 33 34 #include "sferrors.h" 35 36 37 /*************************************************************************/ 38 /* */ 39 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ 40 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ 41 /* messages during execution. */ 42 /* */ 43 #undef FT_COMPONENT 44 #define FT_COMPONENT trace_ttpost 45 46 47 /* If this configuration macro is defined, we rely on the `PSNames' */ 48 /* module to grab the glyph names. */ 49 50 #ifdef FT_CONFIG_OPTION_POSTSCRIPT_NAMES 51 52 53 #include FT_SERVICE_POSTSCRIPT_CMAPS_H 54 55 #define MAC_NAME( x ) ( (FT_String*)psnames->macintosh_name( x ) ) 56 57 58 #else /* FT_CONFIG_OPTION_POSTSCRIPT_NAMES */ 59 60 61 /* Otherwise, we ignore the `PSNames' module, and provide our own */ 62 /* table of Mac names. Thus, it is possible to build a version of */ 63 /* FreeType without the Type 1 driver & PSNames module. */ 64 65 #define MAC_NAME( x ) ( (FT_String*)tt_post_default_names[x] ) 66 67 /* the 258 default Mac PS glyph names */ 68 69 static const FT_String* const tt_post_default_names[258] = 70 { 71 /* 0 */ 72 ".notdef", ".null", "CR", "space", "exclam", 73 "quotedbl", "numbersign", "dollar", "percent", "ampersand", 74 /* 10 */ 75 "quotesingle", "parenleft", "parenright", "asterisk", "plus", 76 "comma", "hyphen", "period", "slash", "zero", 77 /* 20 */ 78 "one", "two", "three", "four", "five", 79 "six", "seven", "eight", "nine", "colon", 80 /* 30 */ 81 "semicolon", "less", "equal", "greater", "question", 82 "at", "A", "B", "C", "D", 83 /* 40 */ 84 "E", "F", "G", "H", "I", 85 "J", "K", "L", "M", "N", 86 /* 50 */ 87 "O", "P", "Q", "R", "S", 88 "T", "U", "V", "W", "X", 89 /* 60 */ 90 "Y", "Z", "bracketleft", "backslash", "bracketright", 91 "asciicircum", "underscore", "grave", "a", "b", 92 /* 70 */ 93 "c", "d", "e", "f", "g", 94 "h", "i", "j", "k", "l", 95 /* 80 */ 96 "m", "n", "o", "p", "q", 97 "r", "s", "t", "u", "v", 98 /* 90 */ 99 "w", "x", "y", "z", "braceleft", 100 "bar", "braceright", "asciitilde", "Adieresis", "Aring", 101 /* 100 */ 102 "Ccedilla", "Eacute", "Ntilde", "Odieresis", "Udieresis", 103 "aacute", "agrave", "acircumflex", "adieresis", "atilde", 104 /* 110 */ 105 "aring", "ccedilla", "eacute", "egrave", "ecircumflex", 106 "edieresis", "iacute", "igrave", "icircumflex", "idieresis", 107 /* 120 */ 108 "ntilde", "oacute", "ograve", "ocircumflex", "odieresis", 109 "otilde", "uacute", "ugrave", "ucircumflex", "udieresis", 110 /* 130 */ 111 "dagger", "degree", "cent", "sterling", "section", 112 "bullet", "paragraph", "germandbls", "registered", "copyright", 113 /* 140 */ 114 "trademark", "acute", "dieresis", "notequal", "AE", 115 "Oslash", "infinity", "plusminus", "lessequal", "greaterequal", 116 /* 150 */ 117 "yen", "mu", "partialdiff", "summation", "product", 118 "pi", "integral", "ordfeminine", "ordmasculine", "Omega", 119 /* 160 */ 120 "ae", "oslash", "questiondown", "exclamdown", "logicalnot", 121 "radical", "florin", "approxequal", "Delta", "guillemotleft", 122 /* 170 */ 123 "guillemotright", "ellipsis", "nbspace", "Agrave", "Atilde", 124 "Otilde", "OE", "oe", "endash", "emdash", 125 /* 180 */ 126 "quotedblleft", "quotedblright", "quoteleft", "quoteright", "divide", 127 "lozenge", "ydieresis", "Ydieresis", "fraction", "currency", 128 /* 190 */ 129 "guilsinglleft", "guilsinglright", "fi", "fl", "daggerdbl", 130 "periodcentered", "quotesinglbase", "quotedblbase", "perthousand", "Acircumflex", 131 /* 200 */ 132 "Ecircumflex", "Aacute", "Edieresis", "Egrave", "Iacute", 133 "Icircumflex", "Idieresis", "Igrave", "Oacute", "Ocircumflex", 134 /* 210 */ 135 "apple", "Ograve", "Uacute", "Ucircumflex", "Ugrave", 136 "dotlessi", "circumflex", "tilde", "macron", "breve", 137 /* 220 */ 138 "dotaccent", "ring", "cedilla", "hungarumlaut", "ogonek", 139 "caron", "Lslash", "lslash", "Scaron", "scaron", 140 /* 230 */ 141 "Zcaron", "zcaron", "brokenbar", "Eth", "eth", 142 "Yacute", "yacute", "Thorn", "thorn", "minus", 143 /* 240 */ 144 "multiply", "onesuperior", "twosuperior", "threesuperior", "onehalf", 145 "onequarter", "threequarters", "franc", "Gbreve", "gbreve", 146 /* 250 */ 147 "Idot", "Scedilla", "scedilla", "Cacute", "cacute", 148 "Ccaron", "ccaron", "dmacron", 149 }; 150 151 152 #endif /* FT_CONFIG_OPTION_POSTSCRIPT_NAMES */ 153 154 155 static FT_Error 156 load_format_20( TT_Face face, 157 FT_Stream stream, 158 FT_Long post_limit ) 159 { 160 FT_Memory memory = stream->memory; 161 FT_Error error; 162 163 FT_Int num_glyphs; 164 FT_UShort num_names; 165 166 FT_UShort* glyph_indices = 0; 167 FT_Char** name_strings = 0; 168 169 170 if ( FT_READ_USHORT( num_glyphs ) ) 171 goto Exit; 172 173 /* UNDOCUMENTED! The number of glyphs in this table can be smaller */ 174 /* than the value in the maxp table (cf. cyberbit.ttf). */ 175 176 /* There already exist fonts which have more than 32768 glyph names */ 177 /* in this table, so the test for this threshold has been dropped. */ 178 179 if ( num_glyphs > face->max_profile.numGlyphs ) 180 { 181 error = FT_THROW( Invalid_File_Format ); 182 goto Exit; 183 } 184 185 /* load the indices */ 186 { 187 FT_Int n; 188 189 190 if ( FT_NEW_ARRAY ( glyph_indices, num_glyphs ) || 191 FT_FRAME_ENTER( num_glyphs * 2L ) ) 192 goto Fail; 193 194 for ( n = 0; n < num_glyphs; n++ ) 195 glyph_indices[n] = FT_GET_USHORT(); 196 197 FT_FRAME_EXIT(); 198 } 199 200 /* compute number of names stored in table */ 201 { 202 FT_Int n; 203 204 205 num_names = 0; 206 207 for ( n = 0; n < num_glyphs; n++ ) 208 { 209 FT_Int idx; 210 211 212 idx = glyph_indices[n]; 213 if ( idx >= 258 ) 214 { 215 idx -= 257; 216 if ( idx > num_names ) 217 num_names = (FT_UShort)idx; 218 } 219 } 220 } 221 222 /* now load the name strings */ 223 { 224 FT_UShort n; 225 226 227 if ( FT_NEW_ARRAY( name_strings, num_names ) ) 228 goto Fail; 229 230 for ( n = 0; n < num_names; n++ ) 231 { 232 FT_UInt len; 233 234 235 if ( FT_STREAM_POS() >= post_limit ) 236 break; 237 else 238 { 239 FT_TRACE6(( "load_format_20: %d byte left in post table\n", 240 post_limit - FT_STREAM_POS() )); 241 242 if ( FT_READ_BYTE( len ) ) 243 goto Fail1; 244 } 245 246 if ( (FT_Int)len > post_limit || 247 FT_STREAM_POS() > post_limit - (FT_Int)len ) 248 { 249 FT_ERROR(( "load_format_20:" 250 " exceeding string length (%d)," 251 " truncating at end of post table (%d byte left)\n", 252 len, post_limit - FT_STREAM_POS() )); 253 len = FT_MAX( 0, post_limit - FT_STREAM_POS() ); 254 } 255 256 if ( FT_NEW_ARRAY( name_strings[n], len + 1 ) || 257 FT_STREAM_READ( name_strings[n], len ) ) 258 goto Fail1; 259 260 name_strings[n][len] = '\0'; 261 } 262 263 if ( n < num_names ) 264 { 265 FT_ERROR(( "load_format_20:" 266 " all entries in post table are already parsed," 267 " using NULL names for gid %d - %d\n", 268 n, num_names - 1 )); 269 for ( ; n < num_names; n++ ) 270 if ( FT_NEW_ARRAY( name_strings[n], 1 ) ) 271 goto Fail1; 272 else 273 name_strings[n][0] = '\0'; 274 } 275 } 276 277 /* all right, set table fields and exit successfully */ 278 { 279 TT_Post_20 table = &face->postscript_names.names.format_20; 280 281 282 table->num_glyphs = (FT_UShort)num_glyphs; 283 table->num_names = (FT_UShort)num_names; 284 table->glyph_indices = glyph_indices; 285 table->glyph_names = name_strings; 286 } 287 return FT_Err_Ok; 288 289 Fail1: 290 { 291 FT_UShort n; 292 293 294 for ( n = 0; n < num_names; n++ ) 295 FT_FREE( name_strings[n] ); 296 } 297 298 Fail: 299 FT_FREE( name_strings ); 300 FT_FREE( glyph_indices ); 301 302 Exit: 303 return error; 304 } 305 306 307 static FT_Error 308 load_format_25( TT_Face face, 309 FT_Stream stream, 310 FT_Long post_limit ) 311 { 312 FT_Memory memory = stream->memory; 313 FT_Error error; 314 315 FT_Int num_glyphs; 316 FT_Char* offset_table = 0; 317 318 FT_UNUSED( post_limit ); 319 320 321 /* UNDOCUMENTED! This value appears only in the Apple TT specs. */ 322 if ( FT_READ_USHORT( num_glyphs ) ) 323 goto Exit; 324 325 /* check the number of glyphs */ 326 if ( num_glyphs > face->max_profile.numGlyphs || num_glyphs > 258 ) 327 { 328 error = FT_THROW( Invalid_File_Format ); 329 goto Exit; 330 } 331 332 if ( FT_NEW_ARRAY( offset_table, num_glyphs ) || 333 FT_STREAM_READ( offset_table, num_glyphs ) ) 334 goto Fail; 335 336 /* now check the offset table */ 337 { 338 FT_Int n; 339 340 341 for ( n = 0; n < num_glyphs; n++ ) 342 { 343 FT_Long idx = (FT_Long)n + offset_table[n]; 344 345 346 if ( idx < 0 || idx > num_glyphs ) 347 { 348 error = FT_THROW( Invalid_File_Format ); 349 goto Fail; 350 } 351 } 352 } 353 354 /* OK, set table fields and exit successfully */ 355 { 356 TT_Post_25 table = &face->postscript_names.names.format_25; 357 358 359 table->num_glyphs = (FT_UShort)num_glyphs; 360 table->offsets = offset_table; 361 } 362 363 return FT_Err_Ok; 364 365 Fail: 366 FT_FREE( offset_table ); 367 368 Exit: 369 return error; 370 } 371 372 373 static FT_Error 374 load_post_names( TT_Face face ) 375 { 376 FT_Stream stream; 377 FT_Error error; 378 FT_Fixed format; 379 FT_ULong post_len; 380 FT_Long post_limit; 381 382 383 /* get a stream for the face's resource */ 384 stream = face->root.stream; 385 386 /* seek to the beginning of the PS names table */ 387 error = face->goto_table( face, TTAG_post, stream, &post_len ); 388 if ( error ) 389 goto Exit; 390 391 post_limit = FT_STREAM_POS() + post_len; 392 393 format = face->postscript.FormatType; 394 395 /* go to beginning of subtable */ 396 if ( FT_STREAM_SKIP( 32 ) ) 397 goto Exit; 398 399 /* now read postscript table */ 400 if ( format == 0x00020000L ) 401 error = load_format_20( face, stream, post_limit ); 402 else if ( format == 0x00028000L ) 403 error = load_format_25( face, stream, post_limit ); 404 else 405 error = FT_THROW( Invalid_File_Format ); 406 407 face->postscript_names.loaded = 1; 408 409 Exit: 410 return error; 411 } 412 413 414 FT_LOCAL_DEF( void ) 415 tt_face_free_ps_names( TT_Face face ) 416 { 417 FT_Memory memory = face->root.memory; 418 TT_Post_Names names = &face->postscript_names; 419 FT_Fixed format; 420 421 422 if ( names->loaded ) 423 { 424 format = face->postscript.FormatType; 425 426 if ( format == 0x00020000L ) 427 { 428 TT_Post_20 table = &names->names.format_20; 429 FT_UShort n; 430 431 432 FT_FREE( table->glyph_indices ); 433 table->num_glyphs = 0; 434 435 for ( n = 0; n < table->num_names; n++ ) 436 FT_FREE( table->glyph_names[n] ); 437 438 FT_FREE( table->glyph_names ); 439 table->num_names = 0; 440 } 441 else if ( format == 0x00028000L ) 442 { 443 TT_Post_25 table = &names->names.format_25; 444 445 446 FT_FREE( table->offsets ); 447 table->num_glyphs = 0; 448 } 449 } 450 names->loaded = 0; 451 } 452 453 454 /*************************************************************************/ 455 /* */ 456 /* <Function> */ 457 /* tt_face_get_ps_name */ 458 /* */ 459 /* <Description> */ 460 /* Get the PostScript glyph name of a glyph. */ 461 /* */ 462 /* <Input> */ 463 /* face :: A handle to the parent face. */ 464 /* */ 465 /* idx :: The glyph index. */ 466 /* */ 467 /* <InOut> */ 468 /* PSname :: The address of a string pointer. Will be NULL in case */ 469 /* of error, otherwise it is a pointer to the glyph name. */ 470 /* */ 471 /* You must not modify the returned string! */ 472 /* */ 473 /* <Output> */ 474 /* FreeType error code. 0 means success. */ 475 /* */ 476 FT_LOCAL_DEF( FT_Error ) 477 tt_face_get_ps_name( TT_Face face, 478 FT_UInt idx, 479 FT_String** PSname ) 480 { 481 FT_Error error; 482 TT_Post_Names names; 483 FT_Fixed format; 484 485 #ifdef FT_CONFIG_OPTION_POSTSCRIPT_NAMES 486 FT_Service_PsCMaps psnames; 487 #endif 488 489 490 if ( !face ) 491 return FT_THROW( Invalid_Face_Handle ); 492 493 if ( idx >= (FT_UInt)face->max_profile.numGlyphs ) 494 return FT_THROW( Invalid_Glyph_Index ); 495 496 #ifdef FT_CONFIG_OPTION_POSTSCRIPT_NAMES 497 psnames = (FT_Service_PsCMaps)face->psnames; 498 if ( !psnames ) 499 return FT_THROW( Unimplemented_Feature ); 500 #endif 501 502 names = &face->postscript_names; 503 504 /* `.notdef' by default */ 505 *PSname = MAC_NAME( 0 ); 506 507 format = face->postscript.FormatType; 508 509 if ( format == 0x00010000L ) 510 { 511 if ( idx < 258 ) /* paranoid checking */ 512 *PSname = MAC_NAME( idx ); 513 } 514 else if ( format == 0x00020000L ) 515 { 516 TT_Post_20 table = &names->names.format_20; 517 518 519 if ( !names->loaded ) 520 { 521 error = load_post_names( face ); 522 if ( error ) 523 goto End; 524 } 525 526 if ( idx < (FT_UInt)table->num_glyphs ) 527 { 528 FT_UShort name_index = table->glyph_indices[idx]; 529 530 531 if ( name_index < 258 ) 532 *PSname = MAC_NAME( name_index ); 533 else 534 *PSname = (FT_String*)table->glyph_names[name_index - 258]; 535 } 536 } 537 else if ( format == 0x00028000L ) 538 { 539 TT_Post_25 table = &names->names.format_25; 540 541 542 if ( !names->loaded ) 543 { 544 error = load_post_names( face ); 545 if ( error ) 546 goto End; 547 } 548 549 if ( idx < (FT_UInt)table->num_glyphs ) /* paranoid checking */ 550 { 551 idx += table->offsets[idx]; 552 *PSname = MAC_NAME( idx ); 553 } 554 } 555 556 /* nothing to do for format == 0x00030000L */ 557 558 End: 559 return FT_Err_Ok; 560 } 561 562 563 /* END */ 564
