Werner Lemberg | ee95b6f | 2004-09-10 14:39:00 +0000 | [diff] [blame] | 1 | /***************************************************************************/ |
| 2 | /* */ |
| 3 | /* otvcommn.c */ |
| 4 | /* */ |
| 5 | /* OpenType common tables validation (body). */ |
| 6 | /* */ |
Werner Lemberg | be3c981 | 2006-01-27 14:16:16 +0000 | [diff] [blame] | 7 | /* Copyright 2004, 2005, 2006 by */ |
Werner Lemberg | ee95b6f | 2004-09-10 14:39:00 +0000 | [diff] [blame] | 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 "otvcommn.h" |
| 20 | |
| 21 | |
| 22 | /*************************************************************************/ |
| 23 | /* */ |
| 24 | /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ |
| 25 | /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ |
| 26 | /* messages during execution. */ |
| 27 | /* */ |
| 28 | #undef FT_COMPONENT |
| 29 | #define FT_COMPONENT trace_otvcommon |
| 30 | |
| 31 | |
| 32 | /*************************************************************************/ |
| 33 | /*************************************************************************/ |
| 34 | /***** *****/ |
| 35 | /***** COVERAGE TABLE *****/ |
| 36 | /***** *****/ |
| 37 | /*************************************************************************/ |
| 38 | /*************************************************************************/ |
| 39 | |
| 40 | FT_LOCAL_DEF( void ) |
| 41 | otv_Coverage_validate( FT_Bytes table, |
| 42 | OTV_Validator valid ) |
| 43 | { |
| 44 | FT_Bytes p = table; |
| 45 | FT_UInt CoverageFormat; |
| 46 | |
| 47 | |
| 48 | OTV_NAME_ENTER( "Coverage" ); |
| 49 | |
| 50 | OTV_LIMIT_CHECK( 4 ); |
| 51 | CoverageFormat = FT_NEXT_USHORT( p ); |
| 52 | |
| 53 | OTV_TRACE(( " (format %d)\n", CoverageFormat )); |
| 54 | |
| 55 | switch ( CoverageFormat ) |
| 56 | { |
| 57 | case 1: /* CoverageFormat1 */ |
| 58 | { |
| 59 | FT_UInt GlyphCount; |
| 60 | |
| 61 | |
| 62 | GlyphCount = FT_NEXT_USHORT( p ); |
| 63 | |
| 64 | OTV_TRACE(( " (GlyphCount = %d)\n", GlyphCount )); |
| 65 | |
| 66 | OTV_LIMIT_CHECK( GlyphCount * 2 ); /* GlyphArray */ |
| 67 | } |
| 68 | break; |
| 69 | |
| 70 | case 2: /* CoverageFormat2 */ |
| 71 | { |
| 72 | FT_UInt n, RangeCount; |
| 73 | FT_UInt Start, End, StartCoverageIndex, total = 0, last = 0; |
| 74 | |
| 75 | |
| 76 | RangeCount = FT_NEXT_USHORT( p ); |
| 77 | |
| 78 | OTV_TRACE(( " (RangeCount = %d)\n", RangeCount )); |
| 79 | |
| 80 | OTV_LIMIT_CHECK( RangeCount * 6 ); |
| 81 | |
| 82 | /* RangeRecord */ |
| 83 | for ( n = 0; n < RangeCount; n++ ) |
| 84 | { |
| 85 | Start = FT_NEXT_USHORT( p ); |
| 86 | End = FT_NEXT_USHORT( p ); |
| 87 | StartCoverageIndex = FT_NEXT_USHORT( p ); |
| 88 | |
| 89 | if ( Start > End || StartCoverageIndex != total ) |
| 90 | FT_INVALID_DATA; |
| 91 | |
| 92 | if ( n > 0 && Start <= last ) |
| 93 | FT_INVALID_DATA; |
| 94 | |
| 95 | total += End - Start + 1; |
| 96 | last = End; |
| 97 | } |
| 98 | } |
| 99 | break; |
| 100 | |
| 101 | default: |
| 102 | FT_INVALID_FORMAT; |
| 103 | } |
| 104 | |
| 105 | /* no need to check glyph indices used as input to coverage tables */ |
| 106 | /* since even invalid glyph indices return a meaningful result */ |
| 107 | |
| 108 | OTV_EXIT; |
| 109 | } |
| 110 | |
| 111 | |
| 112 | FT_LOCAL_DEF( FT_UInt ) |
| 113 | otv_Coverage_get_first( FT_Bytes table ) |
| 114 | { |
| 115 | FT_Bytes p = table; |
| 116 | |
| 117 | |
| 118 | p += 4; /* skip CoverageFormat and Glyph/RangeCount */ |
| 119 | |
| 120 | return FT_NEXT_USHORT( p ); |
| 121 | } |
| 122 | |
| 123 | |
| 124 | FT_LOCAL_DEF( FT_UInt ) |
| 125 | otv_Coverage_get_last( FT_Bytes table ) |
| 126 | { |
| 127 | FT_Bytes p = table; |
| 128 | FT_UInt CoverageFormat = FT_NEXT_USHORT( p ); |
| 129 | FT_UInt count = FT_NEXT_USHORT( p ); /* Glyph/RangeCount */ |
| 130 | FT_UInt result = 0; |
| 131 | |
| 132 | |
| 133 | switch ( CoverageFormat ) |
| 134 | { |
| 135 | case 1: |
| 136 | p += ( count - 1 ) * 2; |
| 137 | result = FT_NEXT_USHORT( p ); |
| 138 | break; |
| 139 | |
| 140 | case 2: |
| 141 | p += ( count - 1 ) * 6 + 2; |
| 142 | result = FT_NEXT_USHORT( p ); |
| 143 | break; |
| 144 | |
| 145 | default: |
| 146 | ; |
| 147 | } |
| 148 | |
| 149 | return result; |
| 150 | } |
| 151 | |
| 152 | |
| 153 | FT_LOCAL_DEF( FT_UInt ) |
| 154 | otv_Coverage_get_count( FT_Bytes table ) |
| 155 | { |
| 156 | FT_Bytes p = table; |
| 157 | FT_UInt CoverageFormat = FT_NEXT_USHORT( p ); |
| 158 | FT_UInt count = FT_NEXT_USHORT( p ); /* Glyph/RangeCount */ |
| 159 | FT_UInt result = 0; |
| 160 | |
| 161 | |
| 162 | switch ( CoverageFormat ) |
| 163 | { |
| 164 | case 1: |
| 165 | return count; |
| 166 | |
| 167 | case 2: |
| 168 | { |
| 169 | FT_UInt Start, End; |
| 170 | |
| 171 | |
| 172 | for ( ; count > 0; count-- ) |
| 173 | { |
| 174 | Start = FT_NEXT_USHORT( p ); |
| 175 | End = FT_NEXT_USHORT( p ); |
| 176 | p += 2; /* skip StartCoverageIndex */ |
| 177 | |
| 178 | result += End - Start + 1; |
| 179 | } |
| 180 | } |
| 181 | break; |
| 182 | |
| 183 | default: |
| 184 | ; |
| 185 | } |
| 186 | |
| 187 | return result; |
| 188 | } |
| 189 | |
| 190 | |
| 191 | /*************************************************************************/ |
| 192 | /*************************************************************************/ |
| 193 | /***** *****/ |
| 194 | /***** CLASS DEFINITION TABLE *****/ |
| 195 | /***** *****/ |
| 196 | /*************************************************************************/ |
| 197 | /*************************************************************************/ |
| 198 | |
| 199 | FT_LOCAL_DEF( void ) |
| 200 | otv_ClassDef_validate( FT_Bytes table, |
| 201 | OTV_Validator valid ) |
| 202 | { |
| 203 | FT_Bytes p = table; |
| 204 | FT_UInt ClassFormat; |
| 205 | |
| 206 | |
| 207 | OTV_NAME_ENTER( "ClassDef" ); |
| 208 | |
| 209 | OTV_LIMIT_CHECK( 4 ); |
| 210 | ClassFormat = FT_NEXT_USHORT( p ); |
| 211 | |
| 212 | OTV_TRACE(( " (format %d)\n", ClassFormat )); |
| 213 | |
| 214 | switch ( ClassFormat ) |
| 215 | { |
| 216 | case 1: /* ClassDefFormat1 */ |
| 217 | { |
| 218 | FT_UInt GlyphCount; |
| 219 | |
| 220 | |
| 221 | p += 2; /* skip StartGlyph */ |
| 222 | |
| 223 | OTV_LIMIT_CHECK( 2 ); |
| 224 | |
Werner Lemberg | ee95b6f | 2004-09-10 14:39:00 +0000 | [diff] [blame] | 225 | GlyphCount = FT_NEXT_USHORT( p ); |
| 226 | |
David Turner | 6a681fa | 2006-01-27 12:11:22 +0000 | [diff] [blame] | 227 | OTV_TRACE(( " (GlyphCount = %d)\n", GlyphCount )); |
| 228 | |
Werner Lemberg | ee95b6f | 2004-09-10 14:39:00 +0000 | [diff] [blame] | 229 | OTV_LIMIT_CHECK( GlyphCount * 2 ); /* ClassValueArray */ |
| 230 | } |
| 231 | break; |
| 232 | |
| 233 | case 2: /* ClassDefFormat2 */ |
| 234 | { |
| 235 | FT_UInt n, ClassRangeCount; |
| 236 | FT_UInt Start, End, last = 0; |
| 237 | |
| 238 | |
| 239 | ClassRangeCount = FT_NEXT_USHORT( p ); |
| 240 | |
| 241 | OTV_TRACE(( " (ClassRangeCount = %d)\n", ClassRangeCount )); |
| 242 | |
| 243 | OTV_LIMIT_CHECK( ClassRangeCount * 6 ); |
| 244 | |
| 245 | /* ClassRangeRecord */ |
| 246 | for ( n = 0; n < ClassRangeCount; n++ ) |
| 247 | { |
| 248 | Start = FT_NEXT_USHORT( p ); |
| 249 | End = FT_NEXT_USHORT( p ); |
| 250 | p += 2; /* skip Class */ |
| 251 | |
| 252 | if ( Start > End || ( n > 0 && Start <= last ) ) |
| 253 | FT_INVALID_DATA; |
| 254 | |
| 255 | last = End; |
| 256 | } |
| 257 | } |
| 258 | break; |
| 259 | |
| 260 | default: |
| 261 | FT_INVALID_FORMAT; |
| 262 | } |
| 263 | |
| 264 | /* no need to check glyph indices used as input to class definition */ |
| 265 | /* tables since even invalid glyph indices return a meaningful result */ |
| 266 | |
| 267 | OTV_EXIT; |
| 268 | } |
| 269 | |
| 270 | |
| 271 | /*************************************************************************/ |
| 272 | /*************************************************************************/ |
| 273 | /***** *****/ |
| 274 | /***** DEVICE TABLE *****/ |
| 275 | /***** *****/ |
| 276 | /*************************************************************************/ |
| 277 | /*************************************************************************/ |
| 278 | |
| 279 | FT_LOCAL_DEF( void ) |
| 280 | otv_Device_validate( FT_Bytes table, |
| 281 | OTV_Validator valid ) |
| 282 | { |
| 283 | FT_Bytes p = table; |
| 284 | FT_UInt StartSize, EndSize, DeltaFormat, count; |
| 285 | |
| 286 | |
| 287 | OTV_NAME_ENTER( "Device" ); |
| 288 | |
| 289 | OTV_LIMIT_CHECK( 8 ); |
| 290 | StartSize = FT_NEXT_USHORT( p ); |
| 291 | EndSize = FT_NEXT_USHORT( p ); |
| 292 | DeltaFormat = FT_NEXT_USHORT( p ); |
| 293 | |
| 294 | if ( DeltaFormat < 1 || DeltaFormat > 3 || EndSize < StartSize ) |
| 295 | FT_INVALID_DATA; |
| 296 | |
| 297 | count = EndSize - StartSize + 1; |
| 298 | OTV_LIMIT_CHECK( ( 1 << DeltaFormat ) * count / 8 ); /* DeltaValue */ |
| 299 | |
| 300 | OTV_EXIT; |
| 301 | } |
| 302 | |
| 303 | |
| 304 | /*************************************************************************/ |
| 305 | /*************************************************************************/ |
| 306 | /***** *****/ |
| 307 | /***** LOOKUPS *****/ |
| 308 | /***** *****/ |
| 309 | /*************************************************************************/ |
| 310 | /*************************************************************************/ |
| 311 | |
| 312 | /* uses valid->type_count */ |
| 313 | /* uses valid->type_funcs */ |
| 314 | |
| 315 | FT_LOCAL_DEF( void ) |
| 316 | otv_Lookup_validate( FT_Bytes table, |
| 317 | OTV_Validator valid ) |
| 318 | { |
| 319 | FT_Bytes p = table; |
| 320 | FT_UInt LookupType, SubTableCount; |
| 321 | OTV_Validate_Func validate; |
| 322 | |
| 323 | |
| 324 | OTV_NAME_ENTER( "Lookup" ); |
| 325 | |
| 326 | OTV_LIMIT_CHECK( 6 ); |
| 327 | LookupType = FT_NEXT_USHORT( p ); |
| 328 | p += 2; /* skip LookupFlag */ |
| 329 | SubTableCount = FT_NEXT_USHORT( p ); |
| 330 | |
| 331 | OTV_TRACE(( " (type %d)\n", LookupType )); |
| 332 | |
| 333 | if ( LookupType == 0 || LookupType >= valid->type_count ) |
| 334 | FT_INVALID_DATA; |
| 335 | |
| 336 | validate = valid->type_funcs[LookupType - 1]; |
| 337 | |
| 338 | OTV_TRACE(( " (SubTableCount = %d)\n", SubTableCount )); |
| 339 | |
| 340 | OTV_LIMIT_CHECK( SubTableCount * 2 ); |
| 341 | |
| 342 | /* SubTable */ |
| 343 | for ( ; SubTableCount > 0; SubTableCount-- ) |
| 344 | validate( table + FT_NEXT_USHORT( p ), valid ); |
| 345 | |
| 346 | OTV_EXIT; |
| 347 | } |
| 348 | |
| 349 | |
| 350 | /* uses valid->lookup_count */ |
| 351 | |
| 352 | FT_LOCAL_DEF( void ) |
| 353 | otv_LookupList_validate( FT_Bytes table, |
| 354 | OTV_Validator valid ) |
| 355 | { |
| 356 | FT_Bytes p = table; |
| 357 | FT_UInt LookupCount; |
| 358 | |
| 359 | |
| 360 | OTV_NAME_ENTER( "LookupList" ); |
| 361 | |
| 362 | OTV_LIMIT_CHECK( 2 ); |
| 363 | LookupCount = FT_NEXT_USHORT( p ); |
| 364 | |
| 365 | OTV_TRACE(( " (LookupCount = %d)\n", LookupCount )); |
| 366 | |
| 367 | OTV_LIMIT_CHECK( LookupCount * 2 ); |
| 368 | |
| 369 | valid->lookup_count = LookupCount; |
| 370 | |
| 371 | /* Lookup */ |
| 372 | for ( ; LookupCount > 0; LookupCount-- ) |
| 373 | otv_Lookup_validate( table + FT_NEXT_USHORT( p ), valid ); |
| 374 | |
| 375 | OTV_EXIT; |
| 376 | } |
| 377 | |
| 378 | |
| 379 | static FT_UInt |
| 380 | otv_LookupList_get_count( FT_Bytes table ) |
| 381 | { |
| 382 | return FT_NEXT_USHORT( table ); |
| 383 | } |
| 384 | |
| 385 | |
| 386 | /*************************************************************************/ |
| 387 | /*************************************************************************/ |
| 388 | /***** *****/ |
| 389 | /***** FEATURES *****/ |
| 390 | /***** *****/ |
| 391 | /*************************************************************************/ |
| 392 | /*************************************************************************/ |
| 393 | |
| 394 | /* uses valid->lookup_count */ |
| 395 | |
| 396 | FT_LOCAL_DEF( void ) |
| 397 | otv_Feature_validate( FT_Bytes table, |
| 398 | OTV_Validator valid ) |
| 399 | { |
| 400 | FT_Bytes p = table; |
| 401 | FT_UInt LookupCount; |
| 402 | |
| 403 | |
| 404 | OTV_NAME_ENTER( "Feature" ); |
| 405 | |
| 406 | OTV_LIMIT_CHECK( 4 ); |
| 407 | p += 2; /* skip FeatureParams (unused) */ |
| 408 | LookupCount = FT_NEXT_USHORT( p ); |
| 409 | |
| 410 | OTV_TRACE(( " (LookupCount = %d)\n", LookupCount )); |
| 411 | |
| 412 | OTV_LIMIT_CHECK( LookupCount * 2 ); |
| 413 | |
| 414 | /* LookupListIndex */ |
| 415 | for ( ; LookupCount > 0; LookupCount-- ) |
| 416 | if ( FT_NEXT_USHORT( p ) >= valid->lookup_count ) |
| 417 | FT_INVALID_DATA; |
| 418 | |
| 419 | OTV_EXIT; |
| 420 | } |
| 421 | |
| 422 | |
| 423 | static FT_UInt |
| 424 | otv_Feature_get_count( FT_Bytes table ) |
| 425 | { |
| 426 | return FT_NEXT_USHORT( table ); |
| 427 | } |
| 428 | |
| 429 | |
| 430 | /* sets valid->lookup_count */ |
| 431 | |
| 432 | FT_LOCAL_DEF( void ) |
| 433 | otv_FeatureList_validate( FT_Bytes table, |
| 434 | FT_Bytes lookups, |
| 435 | OTV_Validator valid ) |
| 436 | { |
| 437 | FT_Bytes p = table; |
| 438 | FT_UInt FeatureCount; |
| 439 | |
| 440 | |
| 441 | OTV_NAME_ENTER( "FeatureList" ); |
| 442 | |
| 443 | OTV_LIMIT_CHECK( 2 ); |
| 444 | FeatureCount = FT_NEXT_USHORT( p ); |
| 445 | |
| 446 | OTV_TRACE(( " (FeatureCount = %d)\n", FeatureCount )); |
| 447 | |
| 448 | OTV_LIMIT_CHECK( FeatureCount * 2 ); |
| 449 | |
| 450 | valid->lookup_count = otv_LookupList_get_count( lookups ); |
| 451 | |
| 452 | /* FeatureRecord */ |
| 453 | for ( ; FeatureCount > 0; FeatureCount-- ) |
| 454 | { |
| 455 | p += 4; /* skip FeatureTag */ |
| 456 | |
| 457 | /* Feature */ |
| 458 | otv_Feature_validate( table + FT_NEXT_USHORT( p ), valid ); |
| 459 | } |
| 460 | |
| 461 | OTV_EXIT; |
| 462 | } |
| 463 | |
| 464 | |
| 465 | /*************************************************************************/ |
| 466 | /*************************************************************************/ |
| 467 | /***** *****/ |
| 468 | /***** LANGUAGE SYSTEM *****/ |
| 469 | /***** *****/ |
| 470 | /*************************************************************************/ |
| 471 | /*************************************************************************/ |
| 472 | |
| 473 | |
| 474 | /* uses valid->extra1 (number of features) */ |
| 475 | |
| 476 | FT_LOCAL_DEF( void ) |
| 477 | otv_LangSys_validate( FT_Bytes table, |
| 478 | OTV_Validator valid ) |
| 479 | { |
| 480 | FT_Bytes p = table; |
| 481 | FT_UInt ReqFeatureIndex; |
| 482 | FT_UInt FeatureCount; |
| 483 | |
| 484 | |
| 485 | OTV_NAME_ENTER( "LangSys" ); |
| 486 | |
| 487 | OTV_LIMIT_CHECK( 6 ); |
| 488 | p += 2; /* skip LookupOrder (unused) */ |
| 489 | ReqFeatureIndex = FT_NEXT_USHORT( p ); |
| 490 | FeatureCount = FT_NEXT_USHORT( p ); |
| 491 | |
| 492 | OTV_TRACE(( " (ReqFeatureIndex = %d)\n", ReqFeatureIndex )); |
| 493 | OTV_TRACE(( " (FeatureCount = %d)\n", FeatureCount )); |
| 494 | |
| 495 | if ( ReqFeatureIndex != 0xFFFFU && ReqFeatureIndex >= valid->extra1 ) |
| 496 | FT_INVALID_DATA; |
| 497 | |
| 498 | OTV_LIMIT_CHECK( FeatureCount * 2 ); |
| 499 | |
| 500 | /* FeatureIndex */ |
| 501 | for ( ; FeatureCount > 0; FeatureCount-- ) |
| 502 | if ( FT_NEXT_USHORT( p ) >= valid->extra1 ) |
| 503 | FT_INVALID_DATA; |
| 504 | |
| 505 | OTV_EXIT; |
| 506 | } |
| 507 | |
| 508 | |
| 509 | /*************************************************************************/ |
| 510 | /*************************************************************************/ |
| 511 | /***** *****/ |
| 512 | /***** SCRIPTS *****/ |
| 513 | /***** *****/ |
| 514 | /*************************************************************************/ |
| 515 | /*************************************************************************/ |
| 516 | |
| 517 | FT_LOCAL_DEF( void ) |
| 518 | otv_Script_validate( FT_Bytes table, |
| 519 | OTV_Validator valid ) |
| 520 | { |
| 521 | FT_UInt DefaultLangSys, LangSysCount; |
| 522 | FT_Bytes p = table; |
| 523 | |
| 524 | |
| 525 | OTV_NAME_ENTER( "Script" ); |
| 526 | |
| 527 | OTV_LIMIT_CHECK( 4 ); |
| 528 | DefaultLangSys = FT_NEXT_USHORT( p ); |
| 529 | LangSysCount = FT_NEXT_USHORT( p ); |
| 530 | |
| 531 | OTV_TRACE(( " (LangSysCount = %d)\n", LangSysCount )); |
| 532 | |
| 533 | if ( DefaultLangSys != 0 ) |
| 534 | otv_LangSys_validate( table + DefaultLangSys, valid ); |
| 535 | |
| 536 | OTV_LIMIT_CHECK( LangSysCount * 6 ); |
| 537 | |
| 538 | /* LangSysRecord */ |
| 539 | for ( ; LangSysCount > 0; LangSysCount-- ) |
| 540 | { |
| 541 | p += 4; /* skip LangSysTag */ |
| 542 | |
| 543 | /* LangSys */ |
| 544 | otv_LangSys_validate( table + FT_NEXT_USHORT( p ), valid ); |
| 545 | } |
| 546 | |
| 547 | OTV_EXIT; |
| 548 | } |
| 549 | |
| 550 | |
| 551 | /* sets valid->extra1 (number of features) */ |
| 552 | |
| 553 | FT_LOCAL_DEF( void ) |
| 554 | otv_ScriptList_validate( FT_Bytes table, |
| 555 | FT_Bytes features, |
| 556 | OTV_Validator valid ) |
| 557 | { |
| 558 | FT_UInt ScriptCount; |
| 559 | FT_Bytes p = table; |
| 560 | |
| 561 | |
| 562 | OTV_NAME_ENTER( "ScriptList" ); |
| 563 | |
| 564 | OTV_LIMIT_CHECK( 2 ); |
| 565 | ScriptCount = FT_NEXT_USHORT( p ); |
| 566 | |
| 567 | OTV_TRACE(( " (ScriptCount = %d)\n", ScriptCount )); |
| 568 | |
| 569 | OTV_LIMIT_CHECK( ScriptCount * 6 ); |
| 570 | |
| 571 | valid->extra1 = otv_Feature_get_count( features ); |
| 572 | |
| 573 | /* ScriptRecord */ |
| 574 | for ( ; ScriptCount > 0; ScriptCount-- ) |
| 575 | { |
| 576 | p += 4; /* skip ScriptTag */ |
| 577 | |
| 578 | otv_Script_validate( table + FT_NEXT_USHORT( p ), valid ); /* Script */ |
| 579 | } |
| 580 | |
| 581 | OTV_EXIT; |
| 582 | } |
| 583 | |
| 584 | |
| 585 | /*************************************************************************/ |
| 586 | /*************************************************************************/ |
| 587 | /***** *****/ |
| 588 | /***** UTILITY FUNCTIONS *****/ |
| 589 | /***** *****/ |
| 590 | /*************************************************************************/ |
| 591 | /*************************************************************************/ |
| 592 | |
| 593 | /* |
| 594 | u: uint16 |
| 595 | ux: unit16 [x] |
| 596 | |
| 597 | s: struct |
| 598 | sx: struct [x] |
| 599 | sxy: struct [x], using external y count |
| 600 | |
| 601 | x: uint16 x |
| 602 | |
| 603 | C: Coverage |
| 604 | |
| 605 | O: Offset |
| 606 | On: Offset (NULL) |
| 607 | Ox: Offset [x] |
| 608 | Onx: Offset (NULL) [x] |
| 609 | */ |
| 610 | |
| 611 | FT_LOCAL_DEF( void ) |
| 612 | otv_x_Ox( FT_Bytes table, |
| 613 | OTV_Validator valid ) |
| 614 | { |
| 615 | FT_Bytes p = table; |
| 616 | FT_UInt Count; |
| 617 | OTV_Validate_Func func; |
| 618 | |
| 619 | |
| 620 | OTV_ENTER; |
| 621 | |
| 622 | OTV_LIMIT_CHECK( 2 ); |
| 623 | Count = FT_NEXT_USHORT( p ); |
| 624 | |
| 625 | OTV_TRACE(( " (Count = %d)\n", Count )); |
| 626 | |
| 627 | OTV_LIMIT_CHECK( Count * 2 ); |
| 628 | |
| 629 | valid->nesting_level++; |
| 630 | func = valid->func[valid->nesting_level]; |
| 631 | |
| 632 | for ( ; Count > 0; Count-- ) |
| 633 | func( table + FT_NEXT_USHORT( p ), valid ); |
| 634 | |
| 635 | valid->nesting_level--; |
| 636 | |
| 637 | OTV_EXIT; |
| 638 | } |
| 639 | |
| 640 | |
| 641 | FT_LOCAL_DEF( void ) |
| 642 | otv_u_C_x_Ox( FT_Bytes table, |
| 643 | OTV_Validator valid ) |
| 644 | { |
| 645 | FT_Bytes p = table; |
| 646 | FT_UInt Count, Coverage; |
| 647 | OTV_Validate_Func func; |
| 648 | |
| 649 | |
| 650 | OTV_ENTER; |
| 651 | |
| 652 | p += 2; /* skip Format */ |
| 653 | |
| 654 | OTV_LIMIT_CHECK( 4 ); |
| 655 | Coverage = FT_NEXT_USHORT( p ); |
| 656 | Count = FT_NEXT_USHORT( p ); |
| 657 | |
| 658 | OTV_TRACE(( " (Count = %d)\n", Count )); |
| 659 | |
| 660 | otv_Coverage_validate( table + Coverage, valid ); |
| 661 | |
| 662 | OTV_LIMIT_CHECK( Count * 2 ); |
| 663 | |
| 664 | valid->nesting_level++; |
| 665 | func = valid->func[valid->nesting_level]; |
| 666 | |
| 667 | for ( ; Count > 0; Count-- ) |
| 668 | func( table + FT_NEXT_USHORT( p ), valid ); |
| 669 | |
| 670 | valid->nesting_level--; |
| 671 | |
| 672 | OTV_EXIT; |
| 673 | } |
| 674 | |
| 675 | |
| 676 | /* uses valid->extra1 (if > 0: array value limit) */ |
| 677 | |
| 678 | FT_LOCAL_DEF( void ) |
| 679 | otv_x_ux( FT_Bytes table, |
| 680 | OTV_Validator valid ) |
| 681 | { |
| 682 | FT_Bytes p = table; |
| 683 | FT_UInt Count; |
| 684 | |
| 685 | |
| 686 | OTV_ENTER; |
| 687 | |
| 688 | OTV_LIMIT_CHECK( 2 ); |
| 689 | Count = FT_NEXT_USHORT( p ); |
| 690 | |
| 691 | OTV_TRACE(( " (Count = %d)\n", Count )); |
| 692 | |
| 693 | OTV_LIMIT_CHECK( Count * 2 ); |
| 694 | |
| 695 | if ( valid->extra1 ) |
| 696 | { |
| 697 | for ( ; Count > 0; Count-- ) |
| 698 | if ( FT_NEXT_USHORT( p ) >= valid->extra1 ) |
| 699 | FT_INVALID_DATA; |
| 700 | } |
| 701 | |
| 702 | OTV_EXIT; |
| 703 | } |
| 704 | |
| 705 | |
| 706 | /* `ux' in the function's name is not really correct since only x-1 */ |
| 707 | /* elements are tested */ |
| 708 | |
| 709 | /* uses valid->extra1 (array value limit) */ |
| 710 | |
| 711 | FT_LOCAL_DEF( void ) |
| 712 | otv_x_y_ux_sy( FT_Bytes table, |
| 713 | OTV_Validator valid ) |
| 714 | { |
| 715 | FT_Bytes p = table; |
| 716 | FT_UInt Count1, Count2; |
| 717 | |
| 718 | |
| 719 | OTV_ENTER; |
| 720 | |
| 721 | OTV_LIMIT_CHECK( 4 ); |
| 722 | Count1 = FT_NEXT_USHORT( p ); |
| 723 | Count2 = FT_NEXT_USHORT( p ); |
| 724 | |
| 725 | OTV_TRACE(( " (Count1 = %d)\n", Count1 )); |
| 726 | OTV_TRACE(( " (Count2 = %d)\n", Count2 )); |
| 727 | |
| 728 | if ( Count1 == 0 ) |
| 729 | FT_INVALID_DATA; |
| 730 | |
| 731 | OTV_LIMIT_CHECK( ( Count1 - 1 ) * 2 + Count2 * 4 ); |
| 732 | |
| 733 | for ( ; Count2 > 0; Count2-- ) |
| 734 | { |
| 735 | if ( FT_NEXT_USHORT( p ) >= Count1 ) |
| 736 | FT_INVALID_DATA; |
| 737 | |
| 738 | if ( FT_NEXT_USHORT( p ) >= valid->extra1 ) |
| 739 | FT_INVALID_DATA; |
| 740 | } |
| 741 | |
| 742 | OTV_EXIT; |
| 743 | } |
| 744 | |
| 745 | |
| 746 | /* `uy' in the function's name is not really correct since only y-1 */ |
| 747 | /* elements are tested */ |
| 748 | |
| 749 | /* uses valid->extra1 (array value limit) */ |
| 750 | |
| 751 | FT_LOCAL_DEF( void ) |
| 752 | otv_x_ux_y_uy_z_uz_p_sp( FT_Bytes table, |
| 753 | OTV_Validator valid ) |
| 754 | { |
| 755 | FT_Bytes p = table; |
| 756 | FT_UInt BacktrackCount, InputCount, LookaheadCount; |
| 757 | FT_UInt Count; |
| 758 | |
| 759 | |
| 760 | OTV_ENTER; |
| 761 | |
| 762 | OTV_LIMIT_CHECK( 2 ); |
| 763 | BacktrackCount = FT_NEXT_USHORT( p ); |
| 764 | |
| 765 | OTV_TRACE(( " (BacktrackCount = %d)\n", BacktrackCount )); |
| 766 | |
| 767 | OTV_LIMIT_CHECK( BacktrackCount * 2 + 2 ); |
| 768 | p += BacktrackCount * 2; |
| 769 | |
| 770 | InputCount = FT_NEXT_USHORT( p ); |
| 771 | if ( InputCount == 0 ) |
| 772 | FT_INVALID_DATA; |
| 773 | |
| 774 | OTV_TRACE(( " (InputCount = %d)\n", InputCount )); |
| 775 | |
| 776 | OTV_LIMIT_CHECK( InputCount * 2 ); |
| 777 | p += ( InputCount - 1 ) * 2; |
| 778 | |
| 779 | LookaheadCount = FT_NEXT_USHORT( p ); |
| 780 | |
| 781 | OTV_TRACE(( " (LookaheadCount = %d)\n", LookaheadCount )); |
| 782 | |
| 783 | OTV_LIMIT_CHECK( LookaheadCount * 2 + 2 ); |
| 784 | p += LookaheadCount * 2; |
| 785 | |
| 786 | Count = FT_NEXT_USHORT( p ); |
| 787 | |
| 788 | OTV_TRACE(( " (Count = %d)\n", Count )); |
| 789 | |
| 790 | OTV_LIMIT_CHECK( Count * 4 ); |
| 791 | |
| 792 | for ( ; Count > 0; Count-- ) |
| 793 | { |
| 794 | if ( FT_NEXT_USHORT( p ) >= InputCount ) |
| 795 | FT_INVALID_DATA; |
| 796 | |
| 797 | if ( FT_NEXT_USHORT( p ) >= valid->extra1 ) |
| 798 | FT_INVALID_DATA; |
| 799 | } |
| 800 | |
| 801 | OTV_EXIT; |
| 802 | } |
| 803 | |
| 804 | |
| 805 | /* sets valid->extra1 (valid->lookup_count) */ |
| 806 | |
| 807 | FT_LOCAL_DEF( void ) |
| 808 | otv_u_O_O_x_Onx( FT_Bytes table, |
| 809 | OTV_Validator valid ) |
| 810 | { |
| 811 | FT_Bytes p = table; |
| 812 | FT_UInt Coverage, ClassDef, ClassSetCount; |
| 813 | OTV_Validate_Func func; |
| 814 | |
| 815 | |
| 816 | OTV_ENTER; |
| 817 | |
| 818 | p += 2; /* skip Format */ |
| 819 | |
| 820 | OTV_LIMIT_CHECK( 6 ); |
| 821 | Coverage = FT_NEXT_USHORT( p ); |
| 822 | ClassDef = FT_NEXT_USHORT( p ); |
| 823 | ClassSetCount = FT_NEXT_USHORT( p ); |
| 824 | |
| 825 | OTV_TRACE(( " (ClassSetCount = %d)\n", ClassSetCount )); |
| 826 | |
| 827 | otv_Coverage_validate( table + Coverage, valid ); |
| 828 | otv_ClassDef_validate( table + ClassDef, valid ); |
| 829 | |
| 830 | OTV_LIMIT_CHECK( ClassSetCount * 2 ); |
| 831 | |
| 832 | valid->nesting_level++; |
| 833 | func = valid->func[valid->nesting_level]; |
| 834 | valid->extra1 = valid->lookup_count; |
| 835 | |
| 836 | for ( ; ClassSetCount > 0; ClassSetCount-- ) |
| 837 | { |
| 838 | FT_UInt offset = FT_NEXT_USHORT( p ); |
| 839 | |
| 840 | |
| 841 | if ( offset ) |
| 842 | func( table + offset, valid ); |
| 843 | } |
| 844 | |
| 845 | valid->nesting_level--; |
| 846 | |
| 847 | OTV_EXIT; |
| 848 | } |
| 849 | |
| 850 | |
| 851 | /* uses valid->lookup_count */ |
| 852 | |
| 853 | FT_LOCAL_DEF( void ) |
| 854 | otv_u_x_y_Ox_sy( FT_Bytes table, |
| 855 | OTV_Validator valid ) |
| 856 | { |
| 857 | FT_Bytes p = table; |
| 858 | FT_UInt GlyphCount, Count, count1; |
| 859 | |
| 860 | |
| 861 | OTV_ENTER; |
| 862 | |
| 863 | p += 2; /* skip Format */ |
| 864 | |
| 865 | OTV_LIMIT_CHECK( 4 ); |
| 866 | GlyphCount = FT_NEXT_USHORT( p ); |
| 867 | Count = FT_NEXT_USHORT( p ); |
| 868 | |
| 869 | OTV_TRACE(( " (GlyphCount = %d)\n", GlyphCount )); |
| 870 | OTV_TRACE(( " (Count = %d)\n", Count )); |
| 871 | |
| 872 | OTV_LIMIT_CHECK( GlyphCount * 2 + Count * 4 ); |
| 873 | |
| 874 | for ( count1 = GlyphCount; count1 > 0; count1-- ) |
| 875 | otv_Coverage_validate( table + FT_NEXT_USHORT( p ), valid ); |
| 876 | |
| 877 | for ( ; Count > 0; Count-- ) |
| 878 | { |
| 879 | if ( FT_NEXT_USHORT( p ) >= GlyphCount ) |
| 880 | FT_INVALID_DATA; |
| 881 | |
| 882 | if ( FT_NEXT_USHORT( p ) >= valid->lookup_count ) |
| 883 | FT_INVALID_DATA; |
| 884 | } |
| 885 | |
| 886 | OTV_EXIT; |
| 887 | } |
| 888 | |
| 889 | |
| 890 | /* sets valid->extra1 (valid->lookup_count) */ |
| 891 | |
| 892 | FT_LOCAL_DEF( void ) |
| 893 | otv_u_O_O_O_O_x_Onx( FT_Bytes table, |
| 894 | OTV_Validator valid ) |
| 895 | { |
| 896 | FT_Bytes p = table; |
| 897 | FT_UInt Coverage; |
| 898 | FT_UInt BacktrackClassDef, InputClassDef, LookaheadClassDef; |
| 899 | FT_UInt ChainClassSetCount; |
| 900 | OTV_Validate_Func func; |
| 901 | |
| 902 | |
| 903 | OTV_ENTER; |
| 904 | |
| 905 | p += 2; /* skip Format */ |
| 906 | |
| 907 | OTV_LIMIT_CHECK( 10 ); |
| 908 | Coverage = FT_NEXT_USHORT( p ); |
| 909 | BacktrackClassDef = FT_NEXT_USHORT( p ); |
| 910 | InputClassDef = FT_NEXT_USHORT( p ); |
| 911 | LookaheadClassDef = FT_NEXT_USHORT( p ); |
| 912 | ChainClassSetCount = FT_NEXT_USHORT( p ); |
| 913 | |
| 914 | OTV_TRACE(( " (ChainClassSetCount = %d)\n", ChainClassSetCount )); |
| 915 | |
| 916 | otv_Coverage_validate( table + Coverage, valid ); |
| 917 | |
| 918 | otv_ClassDef_validate( table + BacktrackClassDef, valid ); |
| 919 | otv_ClassDef_validate( table + InputClassDef, valid ); |
| 920 | otv_ClassDef_validate( table + LookaheadClassDef, valid ); |
| 921 | |
| 922 | OTV_LIMIT_CHECK( ChainClassSetCount * 2 ); |
| 923 | |
| 924 | valid->nesting_level++; |
| 925 | func = valid->func[valid->nesting_level]; |
| 926 | valid->extra1 = valid->lookup_count; |
| 927 | |
| 928 | for ( ; ChainClassSetCount > 0; ChainClassSetCount-- ) |
| 929 | { |
| 930 | FT_UInt offset = FT_NEXT_USHORT( p ); |
| 931 | |
| 932 | |
| 933 | if ( offset ) |
| 934 | func( table + offset, valid ); |
| 935 | } |
| 936 | |
| 937 | valid->nesting_level--; |
| 938 | |
| 939 | OTV_EXIT; |
| 940 | } |
| 941 | |
| 942 | |
| 943 | /* uses valid->lookup_count */ |
| 944 | |
| 945 | FT_LOCAL_DEF( void ) |
| 946 | otv_u_x_Ox_y_Oy_z_Oz_p_sp( FT_Bytes table, |
| 947 | OTV_Validator valid ) |
| 948 | { |
| 949 | FT_Bytes p = table; |
| 950 | FT_UInt BacktrackGlyphCount, InputGlyphCount, LookaheadGlyphCount; |
| 951 | FT_UInt count1, count2; |
| 952 | |
| 953 | |
| 954 | OTV_ENTER; |
| 955 | |
| 956 | p += 2; /* skip Format */ |
| 957 | |
| 958 | OTV_LIMIT_CHECK( 2 ); |
| 959 | BacktrackGlyphCount = FT_NEXT_USHORT( p ); |
| 960 | |
| 961 | OTV_TRACE(( " (BacktrackGlyphCount = %d)\n", BacktrackGlyphCount )); |
| 962 | |
| 963 | OTV_LIMIT_CHECK( BacktrackGlyphCount * 2 + 2 ); |
| 964 | |
| 965 | for ( ; BacktrackGlyphCount > 0; BacktrackGlyphCount-- ) |
| 966 | otv_Coverage_validate( table + FT_NEXT_USHORT( p ), valid ); |
| 967 | |
| 968 | InputGlyphCount = FT_NEXT_USHORT( p ); |
| 969 | |
| 970 | OTV_TRACE(( " (InputGlyphCount = %d)\n", InputGlyphCount )); |
| 971 | |
| 972 | OTV_LIMIT_CHECK( InputGlyphCount * 2 + 2 ); |
| 973 | |
| 974 | for ( count1 = InputGlyphCount; count1 > 0; count1-- ) |
| 975 | otv_Coverage_validate( table + FT_NEXT_USHORT( p ), valid ); |
| 976 | |
| 977 | LookaheadGlyphCount = FT_NEXT_USHORT( p ); |
| 978 | |
| 979 | OTV_TRACE(( " (LookaheadGlyphCount = %d)\n", LookaheadGlyphCount )); |
| 980 | |
| 981 | OTV_LIMIT_CHECK( LookaheadGlyphCount * 2 + 2 ); |
| 982 | |
| 983 | for ( ; LookaheadGlyphCount > 0; LookaheadGlyphCount-- ) |
| 984 | otv_Coverage_validate( table + FT_NEXT_USHORT( p ), valid ); |
| 985 | |
| 986 | count2 = FT_NEXT_USHORT( p ); |
| 987 | |
| 988 | OTV_TRACE(( " (Count = %d)\n", count2 )); |
| 989 | |
| 990 | OTV_LIMIT_CHECK( count2 * 4 ); |
| 991 | |
| 992 | for ( ; count2 > 0; count2-- ) |
| 993 | { |
| 994 | if ( FT_NEXT_USHORT( p ) >= InputGlyphCount ) |
| 995 | FT_INVALID_DATA; |
| 996 | |
| 997 | if ( FT_NEXT_USHORT( p ) >= valid->lookup_count ) |
| 998 | FT_INVALID_DATA; |
| 999 | } |
| 1000 | |
| 1001 | OTV_EXIT; |
| 1002 | } |
| 1003 | |
| 1004 | |
| 1005 | FT_LOCAL_DEF( FT_UInt ) |
| 1006 | otv_GSUBGPOS_get_Lookup_count( FT_Bytes table ) |
| 1007 | { |
| 1008 | FT_Bytes p = table + 8; |
| 1009 | |
| 1010 | |
| 1011 | return otv_LookupList_get_count( table + FT_NEXT_USHORT( p ) ); |
| 1012 | } |
| 1013 | |
| 1014 | |
| 1015 | FT_LOCAL_DEF( FT_UInt ) |
| 1016 | otv_GSUBGPOS_have_MarkAttachmentType_flag( FT_Bytes table ) |
| 1017 | { |
| 1018 | FT_Bytes p, lookup; |
| 1019 | FT_UInt count; |
| 1020 | |
| 1021 | |
Werner Lemberg | ea5b856 | 2005-04-24 21:50:41 +0000 | [diff] [blame] | 1022 | if ( !table ) |
| 1023 | return 0; |
| 1024 | |
Werner Lemberg | ee95b6f | 2004-09-10 14:39:00 +0000 | [diff] [blame] | 1025 | /* LookupList */ |
| 1026 | p = table + 8; |
| 1027 | table += FT_NEXT_USHORT( p ); |
| 1028 | |
| 1029 | /* LookupCount */ |
| 1030 | p = table; |
| 1031 | count = FT_NEXT_USHORT( p ); |
| 1032 | |
| 1033 | for ( ; count > 0; count-- ) |
| 1034 | { |
| 1035 | FT_Bytes oldp; |
| 1036 | |
| 1037 | |
| 1038 | /* Lookup */ |
| 1039 | lookup = table + FT_NEXT_USHORT( p ); |
| 1040 | |
| 1041 | oldp = p; |
| 1042 | |
| 1043 | /* LookupFlag */ |
| 1044 | p = lookup + 2; |
| 1045 | if ( FT_NEXT_USHORT( p ) & 0xFF00U ) |
| 1046 | return 1; |
| 1047 | |
| 1048 | p = oldp; |
| 1049 | } |
| 1050 | |
| 1051 | return 0; |
| 1052 | } |
| 1053 | |
| 1054 | |
| 1055 | /* END */ |