1 /**************************************************************************** 2 * 3 * gxvcommn.c 4 * 5 * TrueTypeGX/AAT common tables validation (body). 6 * 7 * Copyright (C) 2004-2021 by 8 * suzuki toshiya, Masatake YAMATO, Red Hat K.K., 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 * gxvalid is derived from both gxlayout module and otvalid module. 22 * Development of gxlayout is supported by the Information-technology 23 * Promotion Agency(IPA), Japan. 24 * 25 */ 26 27 28 #include "gxvcommn.h" 29 30 31 /************************************************************************** 32 * 33 * The macro FT_COMPONENT is used in trace mode. It is an implicit 34 * parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log 35 * messages during execution. 36 */ 37 #undef FT_COMPONENT 38 #define FT_COMPONENT gxvcommon 39 40 41 /*************************************************************************/ 42 /*************************************************************************/ 43 /***** *****/ 44 /***** 16bit offset sorter *****/ 45 /***** *****/ 46 /*************************************************************************/ 47 /*************************************************************************/ 48 49 FT_COMPARE_DEF( int ) gxv_compare_ushort_offset(const void * a,const void * b)50 gxv_compare_ushort_offset( const void* a, 51 const void* b ) 52 { 53 return *(FT_UShort*)a - *(FT_UShort*)b; 54 } 55 56 57 FT_LOCAL_DEF( void ) gxv_set_length_by_ushort_offset(FT_UShort * offset,FT_UShort ** length,FT_UShort * buff,FT_UInt nmemb,FT_UShort limit,GXV_Validator gxvalid)58 gxv_set_length_by_ushort_offset( FT_UShort* offset, 59 FT_UShort** length, 60 FT_UShort* buff, 61 FT_UInt nmemb, 62 FT_UShort limit, 63 GXV_Validator gxvalid ) 64 { 65 FT_UInt i; 66 67 68 for ( i = 0; i < nmemb; i++ ) 69 *(length[i]) = 0; 70 71 for ( i = 0; i < nmemb; i++ ) 72 buff[i] = offset[i]; 73 buff[nmemb] = limit; 74 75 ft_qsort( buff, ( nmemb + 1 ), sizeof ( FT_UShort ), 76 gxv_compare_ushort_offset ); 77 78 if ( buff[nmemb] > limit ) 79 FT_INVALID_OFFSET; 80 81 for ( i = 0; i < nmemb; i++ ) 82 { 83 FT_UInt j; 84 85 86 for ( j = 0; j < nmemb; j++ ) 87 if ( buff[j] == offset[i] ) 88 break; 89 90 if ( j == nmemb ) 91 FT_INVALID_OFFSET; 92 93 *(length[i]) = (FT_UShort)( buff[j + 1] - buff[j] ); 94 95 if ( 0 != offset[i] && 0 == *(length[i]) ) 96 FT_INVALID_OFFSET; 97 } 98 } 99 100 101 /*************************************************************************/ 102 /*************************************************************************/ 103 /***** *****/ 104 /***** 32bit offset sorter *****/ 105 /***** *****/ 106 /*************************************************************************/ 107 /*************************************************************************/ 108 109 FT_COMPARE_DEF( int ) gxv_compare_ulong_offset(const void * a,const void * b)110 gxv_compare_ulong_offset( const void* a, 111 const void* b ) 112 { 113 FT_ULong a_ = *(FT_ULong*)a; 114 FT_ULong b_ = *(FT_ULong*)b; 115 116 117 if ( a_ < b_ ) 118 return -1; 119 else if ( a_ > b_ ) 120 return 1; 121 else 122 return 0; 123 } 124 125 126 FT_LOCAL_DEF( void ) gxv_set_length_by_ulong_offset(FT_ULong * offset,FT_ULong ** length,FT_ULong * buff,FT_UInt nmemb,FT_ULong limit,GXV_Validator gxvalid)127 gxv_set_length_by_ulong_offset( FT_ULong* offset, 128 FT_ULong** length, 129 FT_ULong* buff, 130 FT_UInt nmemb, 131 FT_ULong limit, 132 GXV_Validator gxvalid) 133 { 134 FT_UInt i; 135 136 137 for ( i = 0; i < nmemb; i++ ) 138 *(length[i]) = 0; 139 140 for ( i = 0; i < nmemb; i++ ) 141 buff[i] = offset[i]; 142 buff[nmemb] = limit; 143 144 ft_qsort( buff, ( nmemb + 1 ), sizeof ( FT_ULong ), 145 gxv_compare_ulong_offset ); 146 147 if ( buff[nmemb] > limit ) 148 FT_INVALID_OFFSET; 149 150 for ( i = 0; i < nmemb; i++ ) 151 { 152 FT_UInt j; 153 154 155 for ( j = 0; j < nmemb; j++ ) 156 if ( buff[j] == offset[i] ) 157 break; 158 159 if ( j == nmemb ) 160 FT_INVALID_OFFSET; 161 162 *(length[i]) = buff[j + 1] - buff[j]; 163 164 if ( 0 != offset[i] && 0 == *(length[i]) ) 165 FT_INVALID_OFFSET; 166 } 167 } 168 169 170 /*************************************************************************/ 171 /*************************************************************************/ 172 /***** *****/ 173 /***** scan value array and get min & max *****/ 174 /***** *****/ 175 /*************************************************************************/ 176 /*************************************************************************/ 177 178 179 FT_LOCAL_DEF( void ) gxv_array_getlimits_byte(FT_Bytes table,FT_Bytes limit,FT_Byte * min,FT_Byte * max,GXV_Validator gxvalid)180 gxv_array_getlimits_byte( FT_Bytes table, 181 FT_Bytes limit, 182 FT_Byte* min, 183 FT_Byte* max, 184 GXV_Validator gxvalid ) 185 { 186 FT_Bytes p = table; 187 188 189 *min = 0xFF; 190 *max = 0x00; 191 192 while ( p < limit ) 193 { 194 FT_Byte val; 195 196 197 GXV_LIMIT_CHECK( 1 ); 198 val = FT_NEXT_BYTE( p ); 199 200 *min = (FT_Byte)FT_MIN( *min, val ); 201 *max = (FT_Byte)FT_MAX( *max, val ); 202 } 203 204 gxvalid->subtable_length = (FT_ULong)( p - table ); 205 } 206 207 208 FT_LOCAL_DEF( void ) gxv_array_getlimits_ushort(FT_Bytes table,FT_Bytes limit,FT_UShort * min,FT_UShort * max,GXV_Validator gxvalid)209 gxv_array_getlimits_ushort( FT_Bytes table, 210 FT_Bytes limit, 211 FT_UShort* min, 212 FT_UShort* max, 213 GXV_Validator gxvalid ) 214 { 215 FT_Bytes p = table; 216 217 218 *min = 0xFFFFU; 219 *max = 0x0000; 220 221 while ( p < limit ) 222 { 223 FT_UShort val; 224 225 226 GXV_LIMIT_CHECK( 2 ); 227 val = FT_NEXT_USHORT( p ); 228 229 *min = (FT_Byte)FT_MIN( *min, val ); 230 *max = (FT_Byte)FT_MAX( *max, val ); 231 } 232 233 gxvalid->subtable_length = (FT_ULong)( p - table ); 234 } 235 236 237 /*************************************************************************/ 238 /*************************************************************************/ 239 /***** *****/ 240 /***** BINSEARCHHEADER *****/ 241 /***** *****/ 242 /*************************************************************************/ 243 /*************************************************************************/ 244 245 typedef struct GXV_BinSrchHeader_ 246 { 247 FT_UShort unitSize; 248 FT_UShort nUnits; 249 FT_UShort searchRange; 250 FT_UShort entrySelector; 251 FT_UShort rangeShift; 252 253 } GXV_BinSrchHeader; 254 255 256 static void gxv_BinSrchHeader_check_consistency(GXV_BinSrchHeader * binSrchHeader,GXV_Validator gxvalid)257 gxv_BinSrchHeader_check_consistency( GXV_BinSrchHeader* binSrchHeader, 258 GXV_Validator gxvalid ) 259 { 260 FT_UShort searchRange; 261 FT_UShort entrySelector; 262 FT_UShort rangeShift; 263 264 265 if ( binSrchHeader->unitSize == 0 ) 266 FT_INVALID_DATA; 267 268 if ( binSrchHeader->nUnits == 0 ) 269 { 270 if ( binSrchHeader->searchRange == 0 && 271 binSrchHeader->entrySelector == 0 && 272 binSrchHeader->rangeShift == 0 ) 273 return; 274 else 275 FT_INVALID_DATA; 276 } 277 278 for ( searchRange = 1, entrySelector = 1; 279 ( searchRange * 2 ) <= binSrchHeader->nUnits && 280 searchRange < 0x8000U; 281 searchRange *= 2, entrySelector++ ) 282 ; 283 284 entrySelector--; 285 searchRange = (FT_UShort)( searchRange * binSrchHeader->unitSize ); 286 rangeShift = (FT_UShort)( binSrchHeader->nUnits * binSrchHeader->unitSize 287 - searchRange ); 288 289 if ( searchRange != binSrchHeader->searchRange || 290 entrySelector != binSrchHeader->entrySelector || 291 rangeShift != binSrchHeader->rangeShift ) 292 { 293 GXV_TRACE(( "Inconsistency found in BinSrchHeader\n" )); 294 GXV_TRACE(( "originally: unitSize=%d, nUnits=%d, " 295 "searchRange=%d, entrySelector=%d, " 296 "rangeShift=%d\n", 297 binSrchHeader->unitSize, binSrchHeader->nUnits, 298 binSrchHeader->searchRange, binSrchHeader->entrySelector, 299 binSrchHeader->rangeShift )); 300 GXV_TRACE(( "calculated: unitSize=%d, nUnits=%d, " 301 "searchRange=%d, entrySelector=%d, " 302 "rangeShift=%d\n", 303 binSrchHeader->unitSize, binSrchHeader->nUnits, 304 searchRange, entrySelector, rangeShift )); 305 306 GXV_SET_ERR_IF_PARANOID( FT_INVALID_DATA ); 307 } 308 } 309 310 311 /* 312 * parser & validator of BinSrchHeader 313 * which is used in LookupTable format 2, 4, 6. 314 * 315 * Essential parameters (unitSize, nUnits) are returned by 316 * given pointer, others (searchRange, entrySelector, rangeShift) 317 * can be calculated by essential parameters, so they are just 318 * validated and discarded. 319 * 320 * However, wrong values in searchRange, entrySelector, rangeShift 321 * won't cause fatal errors, because these parameters might be 322 * only used in old m68k font driver in MacOS. 323 * -- suzuki toshiya <mpsuzuki@hiroshima-u.ac.jp> 324 */ 325 326 FT_LOCAL_DEF( void ) gxv_BinSrchHeader_validate(FT_Bytes table,FT_Bytes limit,FT_UShort * unitSize_p,FT_UShort * nUnits_p,GXV_Validator gxvalid)327 gxv_BinSrchHeader_validate( FT_Bytes table, 328 FT_Bytes limit, 329 FT_UShort* unitSize_p, 330 FT_UShort* nUnits_p, 331 GXV_Validator gxvalid ) 332 { 333 FT_Bytes p = table; 334 GXV_BinSrchHeader binSrchHeader; 335 336 337 GXV_NAME_ENTER( "BinSrchHeader validate" ); 338 339 if ( *unitSize_p == 0 ) 340 { 341 GXV_LIMIT_CHECK( 2 ); 342 binSrchHeader.unitSize = FT_NEXT_USHORT( p ); 343 } 344 else 345 binSrchHeader.unitSize = *unitSize_p; 346 347 if ( *nUnits_p == 0 ) 348 { 349 GXV_LIMIT_CHECK( 2 ); 350 binSrchHeader.nUnits = FT_NEXT_USHORT( p ); 351 } 352 else 353 binSrchHeader.nUnits = *nUnits_p; 354 355 GXV_LIMIT_CHECK( 2 + 2 + 2 ); 356 binSrchHeader.searchRange = FT_NEXT_USHORT( p ); 357 binSrchHeader.entrySelector = FT_NEXT_USHORT( p ); 358 binSrchHeader.rangeShift = FT_NEXT_USHORT( p ); 359 GXV_TRACE(( "nUnits %d\n", binSrchHeader.nUnits )); 360 361 gxv_BinSrchHeader_check_consistency( &binSrchHeader, gxvalid ); 362 363 if ( *unitSize_p == 0 ) 364 *unitSize_p = binSrchHeader.unitSize; 365 366 if ( *nUnits_p == 0 ) 367 *nUnits_p = binSrchHeader.nUnits; 368 369 gxvalid->subtable_length = (FT_ULong)( p - table ); 370 GXV_EXIT; 371 } 372 373 374 /*************************************************************************/ 375 /*************************************************************************/ 376 /***** *****/ 377 /***** LOOKUP TABLE *****/ 378 /***** *****/ 379 /*************************************************************************/ 380 /*************************************************************************/ 381 382 #define GXV_LOOKUP_VALUE_LOAD( P, SIGNSPEC ) \ 383 ( P += 2, gxv_lookup_value_load( P - 2, SIGNSPEC ) ) 384 385 static GXV_LookupValueDesc gxv_lookup_value_load(FT_Bytes p,GXV_LookupValue_SignSpec signspec)386 gxv_lookup_value_load( FT_Bytes p, 387 GXV_LookupValue_SignSpec signspec ) 388 { 389 GXV_LookupValueDesc v; 390 391 392 if ( signspec == GXV_LOOKUPVALUE_UNSIGNED ) 393 v.u = FT_NEXT_USHORT( p ); 394 else 395 v.s = FT_NEXT_SHORT( p ); 396 397 return v; 398 } 399 400 401 #define GXV_UNITSIZE_VALIDATE( FORMAT, UNITSIZE, NUNITS, CORRECTSIZE ) \ 402 FT_BEGIN_STMNT \ 403 if ( UNITSIZE != CORRECTSIZE ) \ 404 { \ 405 FT_ERROR(( "unitSize=%d differs from" \ 406 " expected unitSize=%d" \ 407 " in LookupTable %s\n", \ 408 UNITSIZE, CORRECTSIZE, FORMAT )); \ 409 if ( UNITSIZE != 0 && NUNITS != 0 ) \ 410 { \ 411 FT_ERROR(( " cannot validate anymore\n" )); \ 412 FT_INVALID_FORMAT; \ 413 } \ 414 else \ 415 FT_ERROR(( " forcibly continues\n" )); \ 416 } \ 417 FT_END_STMNT 418 419 420 /* ================= Simple Array Format 0 Lookup Table ================ */ 421 static void gxv_LookupTable_fmt0_validate(FT_Bytes table,FT_Bytes limit,GXV_Validator gxvalid)422 gxv_LookupTable_fmt0_validate( FT_Bytes table, 423 FT_Bytes limit, 424 GXV_Validator gxvalid ) 425 { 426 FT_Bytes p = table; 427 FT_UShort i; 428 429 GXV_LookupValueDesc value; 430 431 432 GXV_NAME_ENTER( "LookupTable format 0" ); 433 434 GXV_LIMIT_CHECK( 2 * gxvalid->face->num_glyphs ); 435 436 for ( i = 0; i < gxvalid->face->num_glyphs; i++ ) 437 { 438 GXV_LIMIT_CHECK( 2 ); 439 if ( p + 2 >= limit ) /* some fonts have too-short fmt0 array */ 440 { 441 GXV_TRACE(( "too short, glyphs %d - %ld are missing\n", 442 i, gxvalid->face->num_glyphs )); 443 GXV_SET_ERR_IF_PARANOID( FT_INVALID_GLYPH_ID ); 444 break; 445 } 446 447 value = GXV_LOOKUP_VALUE_LOAD( p, gxvalid->lookupval_sign ); 448 gxvalid->lookupval_func( i, &value, gxvalid ); 449 } 450 451 gxvalid->subtable_length = (FT_ULong)( p - table ); 452 GXV_EXIT; 453 } 454 455 456 /* ================= Segment Single Format 2 Lookup Table ============== */ 457 /* 458 * Apple spec says: 459 * 460 * To guarantee that a binary search terminates, you must include one or 461 * more special `end of search table' values at the end of the data to 462 * be searched. The number of termination values that need to be 463 * included is table-specific. The value that indicates binary search 464 * termination is 0xFFFF. 465 * 466 * The problem is that nUnits does not include this end-marker. It's 467 * quite difficult to discriminate whether the following 0xFFFF comes from 468 * the end-marker or some next data. 469 * 470 * -- suzuki toshiya <mpsuzuki@hiroshima-u.ac.jp> 471 */ 472 static void gxv_LookupTable_fmt2_skip_endmarkers(FT_Bytes table,FT_UShort unitSize,GXV_Validator gxvalid)473 gxv_LookupTable_fmt2_skip_endmarkers( FT_Bytes table, 474 FT_UShort unitSize, 475 GXV_Validator gxvalid ) 476 { 477 FT_Bytes p = table; 478 479 480 while ( ( p + 4 ) < gxvalid->root->limit ) 481 { 482 if ( p[0] != 0xFF || p[1] != 0xFF || /* lastGlyph */ 483 p[2] != 0xFF || p[3] != 0xFF ) /* firstGlyph */ 484 break; 485 p += unitSize; 486 } 487 488 gxvalid->subtable_length = (FT_ULong)( p - table ); 489 } 490 491 492 static void gxv_LookupTable_fmt2_validate(FT_Bytes table,FT_Bytes limit,GXV_Validator gxvalid)493 gxv_LookupTable_fmt2_validate( FT_Bytes table, 494 FT_Bytes limit, 495 GXV_Validator gxvalid ) 496 { 497 FT_Bytes p = table; 498 FT_UShort gid; 499 500 FT_UShort unitSize; 501 FT_UShort nUnits; 502 FT_UShort unit; 503 FT_UShort lastGlyph; 504 FT_UShort firstGlyph; 505 GXV_LookupValueDesc value; 506 507 508 GXV_NAME_ENTER( "LookupTable format 2" ); 509 510 unitSize = nUnits = 0; 511 gxv_BinSrchHeader_validate( p, limit, &unitSize, &nUnits, gxvalid ); 512 p += gxvalid->subtable_length; 513 514 GXV_UNITSIZE_VALIDATE( "format2", unitSize, nUnits, 6 ); 515 516 for ( unit = 0, gid = 0; unit < nUnits; unit++ ) 517 { 518 GXV_LIMIT_CHECK( 2 + 2 + 2 ); 519 lastGlyph = FT_NEXT_USHORT( p ); 520 firstGlyph = FT_NEXT_USHORT( p ); 521 value = GXV_LOOKUP_VALUE_LOAD( p, gxvalid->lookupval_sign ); 522 523 gxv_glyphid_validate( firstGlyph, gxvalid ); 524 gxv_glyphid_validate( lastGlyph, gxvalid ); 525 526 if ( lastGlyph < gid ) 527 { 528 GXV_TRACE(( "reverse ordered segment specification:" 529 " lastGlyph[%d]=%d < lastGlyph[%d]=%d\n", 530 unit, lastGlyph, unit - 1 , gid )); 531 GXV_SET_ERR_IF_PARANOID( FT_INVALID_GLYPH_ID ); 532 } 533 534 if ( lastGlyph < firstGlyph ) 535 { 536 GXV_TRACE(( "reverse ordered range specification at unit %d:" 537 " lastGlyph %d < firstGlyph %d ", 538 unit, lastGlyph, firstGlyph )); 539 GXV_SET_ERR_IF_PARANOID( FT_INVALID_GLYPH_ID ); 540 541 if ( gxvalid->root->level == FT_VALIDATE_TIGHT ) 542 continue; /* ftxvalidator silently skips such an entry */ 543 544 FT_TRACE4(( "continuing with exchanged values\n" )); 545 gid = firstGlyph; 546 firstGlyph = lastGlyph; 547 lastGlyph = gid; 548 } 549 550 for ( gid = firstGlyph; gid <= lastGlyph; gid++ ) 551 gxvalid->lookupval_func( gid, &value, gxvalid ); 552 } 553 554 gxv_LookupTable_fmt2_skip_endmarkers( p, unitSize, gxvalid ); 555 p += gxvalid->subtable_length; 556 557 gxvalid->subtable_length = (FT_ULong)( p - table ); 558 GXV_EXIT; 559 } 560 561 562 /* ================= Segment Array Format 4 Lookup Table =============== */ 563 static void gxv_LookupTable_fmt4_validate(FT_Bytes table,FT_Bytes limit,GXV_Validator gxvalid)564 gxv_LookupTable_fmt4_validate( FT_Bytes table, 565 FT_Bytes limit, 566 GXV_Validator gxvalid ) 567 { 568 FT_Bytes p = table; 569 FT_UShort unit; 570 FT_UShort gid; 571 572 FT_UShort unitSize; 573 FT_UShort nUnits; 574 FT_UShort lastGlyph; 575 FT_UShort firstGlyph; 576 GXV_LookupValueDesc base_value; 577 GXV_LookupValueDesc value; 578 579 580 GXV_NAME_ENTER( "LookupTable format 4" ); 581 582 unitSize = nUnits = 0; 583 gxv_BinSrchHeader_validate( p, limit, &unitSize, &nUnits, gxvalid ); 584 p += gxvalid->subtable_length; 585 586 GXV_UNITSIZE_VALIDATE( "format4", unitSize, nUnits, 6 ); 587 588 for ( unit = 0, gid = 0; unit < nUnits; unit++ ) 589 { 590 GXV_LIMIT_CHECK( 2 + 2 ); 591 lastGlyph = FT_NEXT_USHORT( p ); 592 firstGlyph = FT_NEXT_USHORT( p ); 593 594 gxv_glyphid_validate( firstGlyph, gxvalid ); 595 gxv_glyphid_validate( lastGlyph, gxvalid ); 596 597 if ( lastGlyph < gid ) 598 { 599 GXV_TRACE(( "reverse ordered segment specification:" 600 " lastGlyph[%d]=%d < lastGlyph[%d]=%d\n", 601 unit, lastGlyph, unit - 1 , gid )); 602 GXV_SET_ERR_IF_PARANOID( FT_INVALID_GLYPH_ID ); 603 } 604 605 if ( lastGlyph < firstGlyph ) 606 { 607 GXV_TRACE(( "reverse ordered range specification at unit %d:" 608 " lastGlyph %d < firstGlyph %d ", 609 unit, lastGlyph, firstGlyph )); 610 GXV_SET_ERR_IF_PARANOID( FT_INVALID_GLYPH_ID ); 611 612 if ( gxvalid->root->level == FT_VALIDATE_TIGHT ) 613 continue; /* ftxvalidator silently skips such an entry */ 614 615 FT_TRACE4(( "continuing with exchanged values\n" )); 616 gid = firstGlyph; 617 firstGlyph = lastGlyph; 618 lastGlyph = gid; 619 } 620 621 GXV_LIMIT_CHECK( 2 ); 622 base_value = GXV_LOOKUP_VALUE_LOAD( p, GXV_LOOKUPVALUE_UNSIGNED ); 623 624 for ( gid = firstGlyph; gid <= lastGlyph; gid++ ) 625 { 626 value = gxvalid->lookupfmt4_trans( (FT_UShort)( gid - firstGlyph ), 627 &base_value, 628 limit, 629 gxvalid ); 630 631 gxvalid->lookupval_func( gid, &value, gxvalid ); 632 } 633 } 634 635 gxv_LookupTable_fmt2_skip_endmarkers( p, unitSize, gxvalid ); 636 p += gxvalid->subtable_length; 637 638 gxvalid->subtable_length = (FT_ULong)( p - table ); 639 GXV_EXIT; 640 } 641 642 643 /* ================= Segment Table Format 6 Lookup Table =============== */ 644 static void gxv_LookupTable_fmt6_skip_endmarkers(FT_Bytes table,FT_UShort unitSize,GXV_Validator gxvalid)645 gxv_LookupTable_fmt6_skip_endmarkers( FT_Bytes table, 646 FT_UShort unitSize, 647 GXV_Validator gxvalid ) 648 { 649 FT_Bytes p = table; 650 651 652 while ( p < gxvalid->root->limit ) 653 { 654 if ( p[0] != 0xFF || p[1] != 0xFF ) 655 break; 656 p += unitSize; 657 } 658 659 gxvalid->subtable_length = (FT_ULong)( p - table ); 660 } 661 662 663 static void gxv_LookupTable_fmt6_validate(FT_Bytes table,FT_Bytes limit,GXV_Validator gxvalid)664 gxv_LookupTable_fmt6_validate( FT_Bytes table, 665 FT_Bytes limit, 666 GXV_Validator gxvalid ) 667 { 668 FT_Bytes p = table; 669 FT_UShort unit; 670 FT_UShort prev_glyph; 671 672 FT_UShort unitSize; 673 FT_UShort nUnits; 674 FT_UShort glyph; 675 GXV_LookupValueDesc value; 676 677 678 GXV_NAME_ENTER( "LookupTable format 6" ); 679 680 unitSize = nUnits = 0; 681 gxv_BinSrchHeader_validate( p, limit, &unitSize, &nUnits, gxvalid ); 682 p += gxvalid->subtable_length; 683 684 GXV_UNITSIZE_VALIDATE( "format6", unitSize, nUnits, 4 ); 685 686 for ( unit = 0, prev_glyph = 0; unit < nUnits; unit++ ) 687 { 688 GXV_LIMIT_CHECK( 2 + 2 ); 689 glyph = FT_NEXT_USHORT( p ); 690 value = GXV_LOOKUP_VALUE_LOAD( p, gxvalid->lookupval_sign ); 691 692 if ( gxv_glyphid_validate( glyph, gxvalid ) ) 693 GXV_TRACE(( " endmarker found within defined range" 694 " (entry %d < nUnits=%d)\n", 695 unit, nUnits )); 696 697 if ( prev_glyph > glyph ) 698 { 699 GXV_TRACE(( "current gid 0x%04x < previous gid 0x%04x\n", 700 glyph, prev_glyph )); 701 GXV_SET_ERR_IF_PARANOID( FT_INVALID_GLYPH_ID ); 702 } 703 prev_glyph = glyph; 704 705 gxvalid->lookupval_func( glyph, &value, gxvalid ); 706 } 707 708 gxv_LookupTable_fmt6_skip_endmarkers( p, unitSize, gxvalid ); 709 p += gxvalid->subtable_length; 710 711 gxvalid->subtable_length = (FT_ULong)( p - table ); 712 GXV_EXIT; 713 } 714 715 716 /* ================= Trimmed Array Format 8 Lookup Table =============== */ 717 static void gxv_LookupTable_fmt8_validate(FT_Bytes table,FT_Bytes limit,GXV_Validator gxvalid)718 gxv_LookupTable_fmt8_validate( FT_Bytes table, 719 FT_Bytes limit, 720 GXV_Validator gxvalid ) 721 { 722 FT_Bytes p = table; 723 FT_UShort i; 724 725 GXV_LookupValueDesc value; 726 FT_UShort firstGlyph; 727 FT_UShort glyphCount; 728 729 730 GXV_NAME_ENTER( "LookupTable format 8" ); 731 732 /* firstGlyph + glyphCount */ 733 GXV_LIMIT_CHECK( 2 + 2 ); 734 firstGlyph = FT_NEXT_USHORT( p ); 735 glyphCount = FT_NEXT_USHORT( p ); 736 737 gxv_glyphid_validate( firstGlyph, gxvalid ); 738 gxv_glyphid_validate( (FT_UShort)( firstGlyph + glyphCount ), gxvalid ); 739 740 /* valueArray */ 741 for ( i = 0; i < glyphCount; i++ ) 742 { 743 GXV_LIMIT_CHECK( 2 ); 744 value = GXV_LOOKUP_VALUE_LOAD( p, gxvalid->lookupval_sign ); 745 gxvalid->lookupval_func( (FT_UShort)( firstGlyph + i ), &value, gxvalid ); 746 } 747 748 gxvalid->subtable_length = (FT_ULong)( p - table ); 749 GXV_EXIT; 750 } 751 752 753 FT_LOCAL_DEF( void ) gxv_LookupTable_validate(FT_Bytes table,FT_Bytes limit,GXV_Validator gxvalid)754 gxv_LookupTable_validate( FT_Bytes table, 755 FT_Bytes limit, 756 GXV_Validator gxvalid ) 757 { 758 FT_Bytes p = table; 759 FT_UShort format; 760 761 GXV_Validate_Func fmt_funcs_table[] = 762 { 763 gxv_LookupTable_fmt0_validate, /* 0 */ 764 NULL, /* 1 */ 765 gxv_LookupTable_fmt2_validate, /* 2 */ 766 NULL, /* 3 */ 767 gxv_LookupTable_fmt4_validate, /* 4 */ 768 NULL, /* 5 */ 769 gxv_LookupTable_fmt6_validate, /* 6 */ 770 NULL, /* 7 */ 771 gxv_LookupTable_fmt8_validate, /* 8 */ 772 }; 773 774 GXV_Validate_Func func; 775 776 777 GXV_NAME_ENTER( "LookupTable" ); 778 779 /* lookuptbl_head may be used in fmt4 transit function. */ 780 gxvalid->lookuptbl_head = table; 781 782 /* format */ 783 GXV_LIMIT_CHECK( 2 ); 784 format = FT_NEXT_USHORT( p ); 785 GXV_TRACE(( " (format %d)\n", format )); 786 787 if ( format > 8 ) 788 FT_INVALID_FORMAT; 789 790 func = fmt_funcs_table[format]; 791 if ( !func ) 792 FT_INVALID_FORMAT; 793 794 func( p, limit, gxvalid ); 795 p += gxvalid->subtable_length; 796 797 gxvalid->subtable_length = (FT_ULong)( p - table ); 798 799 GXV_EXIT; 800 } 801 802 803 /*************************************************************************/ 804 /*************************************************************************/ 805 /***** *****/ 806 /***** Glyph ID *****/ 807 /***** *****/ 808 /*************************************************************************/ 809 /*************************************************************************/ 810 811 FT_LOCAL_DEF( FT_Int ) gxv_glyphid_validate(FT_UShort gid,GXV_Validator gxvalid)812 gxv_glyphid_validate( FT_UShort gid, 813 GXV_Validator gxvalid ) 814 { 815 FT_Face face; 816 817 818 if ( gid == 0xFFFFU ) 819 { 820 GXV_EXIT; 821 return 1; 822 } 823 824 face = gxvalid->face; 825 if ( face->num_glyphs < gid ) 826 { 827 GXV_TRACE(( " gxv_glyphid_check() gid overflow: num_glyphs %ld < %d\n", 828 face->num_glyphs, gid )); 829 GXV_SET_ERR_IF_PARANOID( FT_INVALID_GLYPH_ID ); 830 } 831 832 return 0; 833 } 834 835 836 /*************************************************************************/ 837 /*************************************************************************/ 838 /***** *****/ 839 /***** CONTROL POINT *****/ 840 /***** *****/ 841 /*************************************************************************/ 842 /*************************************************************************/ 843 844 FT_LOCAL_DEF( void ) gxv_ctlPoint_validate(FT_UShort gid,FT_UShort ctl_point,GXV_Validator gxvalid)845 gxv_ctlPoint_validate( FT_UShort gid, 846 FT_UShort ctl_point, 847 GXV_Validator gxvalid ) 848 { 849 FT_Face face; 850 FT_Error error; 851 852 FT_GlyphSlot glyph; 853 FT_Outline outline; 854 FT_UShort n_points; 855 856 857 face = gxvalid->face; 858 859 error = FT_Load_Glyph( face, 860 gid, 861 FT_LOAD_NO_BITMAP | FT_LOAD_IGNORE_TRANSFORM ); 862 if ( error ) 863 FT_INVALID_GLYPH_ID; 864 865 glyph = face->glyph; 866 outline = glyph->outline; 867 n_points = (FT_UShort)outline.n_points; 868 869 if ( !( ctl_point < n_points ) ) 870 FT_INVALID_DATA; 871 } 872 873 874 /*************************************************************************/ 875 /*************************************************************************/ 876 /***** *****/ 877 /***** SFNT NAME *****/ 878 /***** *****/ 879 /*************************************************************************/ 880 /*************************************************************************/ 881 882 FT_LOCAL_DEF( void ) gxv_sfntName_validate(FT_UShort name_index,FT_UShort min_index,FT_UShort max_index,GXV_Validator gxvalid)883 gxv_sfntName_validate( FT_UShort name_index, 884 FT_UShort min_index, 885 FT_UShort max_index, 886 GXV_Validator gxvalid ) 887 { 888 FT_SfntName name; 889 FT_UInt i; 890 FT_UInt nnames; 891 892 893 GXV_NAME_ENTER( "sfntName" ); 894 895 if ( name_index < min_index || max_index < name_index ) 896 FT_INVALID_FORMAT; 897 898 nnames = FT_Get_Sfnt_Name_Count( gxvalid->face ); 899 for ( i = 0; i < nnames; i++ ) 900 { 901 if ( FT_Get_Sfnt_Name( gxvalid->face, i, &name ) != FT_Err_Ok ) 902 continue; 903 904 if ( name.name_id == name_index ) 905 goto Out; 906 } 907 908 GXV_TRACE(( " nameIndex = %d (UNTITLED)\n", name_index )); 909 FT_INVALID_DATA; 910 goto Exit; /* make compiler happy */ 911 912 Out: 913 FT_TRACE1(( " nameIndex = %d (", name_index )); 914 GXV_TRACE_HEXDUMP_SFNTNAME( name ); 915 FT_TRACE1(( ")\n" )); 916 917 Exit: 918 GXV_EXIT; 919 } 920 921 922 /*************************************************************************/ 923 /*************************************************************************/ 924 /***** *****/ 925 /***** STATE TABLE *****/ 926 /***** *****/ 927 /*************************************************************************/ 928 /*************************************************************************/ 929 930 /* -------------------------- Class Table --------------------------- */ 931 932 /* 933 * highestClass specifies how many classes are defined in this 934 * Class Subtable. Apple spec does not mention whether undefined 935 * holes in the class (e.g.: 0-3 are predefined, 4 is unused, 5 is used) 936 * are permitted. At present, holes in a defined class are not checked. 937 * -- suzuki toshiya <mpsuzuki@hiroshima-u.ac.jp> 938 */ 939 940 static void gxv_ClassTable_validate(FT_Bytes table,FT_UShort * length_p,FT_UShort stateSize,FT_Byte * maxClassID_p,GXV_Validator gxvalid)941 gxv_ClassTable_validate( FT_Bytes table, 942 FT_UShort* length_p, 943 FT_UShort stateSize, 944 FT_Byte* maxClassID_p, 945 GXV_Validator gxvalid ) 946 { 947 FT_Bytes p = table; 948 FT_Bytes limit = table + *length_p; 949 FT_UShort firstGlyph; 950 FT_UShort nGlyphs; 951 952 953 GXV_NAME_ENTER( "ClassTable" ); 954 955 *maxClassID_p = 3; /* Classes 0, 2, and 3 are predefined */ 956 957 GXV_LIMIT_CHECK( 2 + 2 ); 958 firstGlyph = FT_NEXT_USHORT( p ); 959 nGlyphs = FT_NEXT_USHORT( p ); 960 961 GXV_TRACE(( " (firstGlyph = %d, nGlyphs = %d)\n", firstGlyph, nGlyphs )); 962 963 if ( !nGlyphs ) 964 goto Out; 965 966 gxv_glyphid_validate( (FT_UShort)( firstGlyph + nGlyphs ), gxvalid ); 967 968 { 969 FT_Byte nGlyphInClass[256]; 970 FT_Byte classID; 971 FT_UShort i; 972 973 974 FT_MEM_ZERO( nGlyphInClass, 256 ); 975 976 977 for ( i = 0; i < nGlyphs; i++ ) 978 { 979 GXV_LIMIT_CHECK( 1 ); 980 classID = FT_NEXT_BYTE( p ); 981 switch ( classID ) 982 { 983 /* following classes should not appear in class array */ 984 case 0: /* end of text */ 985 case 2: /* out of bounds */ 986 case 3: /* end of line */ 987 FT_INVALID_DATA; 988 break; 989 990 case 1: /* out of bounds */ 991 default: /* user-defined: 4 - ( stateSize - 1 ) */ 992 if ( classID >= stateSize ) 993 FT_INVALID_DATA; /* assign glyph to undefined state */ 994 995 nGlyphInClass[classID]++; 996 break; 997 } 998 } 999 *length_p = (FT_UShort)( p - table ); 1000 1001 /* scan max ClassID in use */ 1002 for ( i = 0; i < stateSize; i++ ) 1003 if ( ( 3 < i ) && ( nGlyphInClass[i] > 0 ) ) 1004 *maxClassID_p = (FT_Byte)i; /* XXX: Check Range? */ 1005 } 1006 1007 Out: 1008 GXV_TRACE(( "Declared stateSize=0x%02x, Used maxClassID=0x%02x\n", 1009 stateSize, *maxClassID_p )); 1010 GXV_EXIT; 1011 } 1012 1013 1014 /* --------------------------- State Array ----------------------------- */ 1015 1016 static void gxv_StateArray_validate(FT_Bytes table,FT_UShort * length_p,FT_Byte maxClassID,FT_UShort stateSize,FT_Byte * maxState_p,FT_Byte * maxEntry_p,GXV_Validator gxvalid)1017 gxv_StateArray_validate( FT_Bytes table, 1018 FT_UShort* length_p, 1019 FT_Byte maxClassID, 1020 FT_UShort stateSize, 1021 FT_Byte* maxState_p, 1022 FT_Byte* maxEntry_p, 1023 GXV_Validator gxvalid ) 1024 { 1025 FT_Bytes p = table; 1026 FT_Bytes limit = table + *length_p; 1027 FT_Byte clazz; 1028 FT_Byte entry; 1029 1030 FT_UNUSED( stateSize ); /* for the non-debugging case */ 1031 1032 1033 GXV_NAME_ENTER( "StateArray" ); 1034 1035 GXV_TRACE(( "parse %d bytes by stateSize=%d maxClassID=%d\n", 1036 (int)(*length_p), stateSize, (int)(maxClassID) )); 1037 1038 /* 1039 * 2 states are predefined and must be described in StateArray: 1040 * state 0 (start of text), 1 (start of line) 1041 */ 1042 GXV_LIMIT_CHECK( ( 1 + maxClassID ) * 2 ); 1043 1044 *maxState_p = 0; 1045 *maxEntry_p = 0; 1046 1047 /* read if enough to read another state */ 1048 while ( p + ( 1 + maxClassID ) <= limit ) 1049 { 1050 (*maxState_p)++; 1051 for ( clazz = 0; clazz <= maxClassID; clazz++ ) 1052 { 1053 entry = FT_NEXT_BYTE( p ); 1054 *maxEntry_p = (FT_Byte)FT_MAX( *maxEntry_p, entry ); 1055 } 1056 } 1057 GXV_TRACE(( "parsed: maxState=%d, maxEntry=%d\n", 1058 *maxState_p, *maxEntry_p )); 1059 1060 *length_p = (FT_UShort)( p - table ); 1061 1062 GXV_EXIT; 1063 } 1064 1065 1066 /* --------------------------- Entry Table ----------------------------- */ 1067 1068 static void gxv_EntryTable_validate(FT_Bytes table,FT_UShort * length_p,FT_Byte maxEntry,FT_UShort stateArray,FT_UShort stateArray_length,FT_Byte maxClassID,FT_Bytes statetable_table,FT_Bytes statetable_limit,GXV_Validator gxvalid)1069 gxv_EntryTable_validate( FT_Bytes table, 1070 FT_UShort* length_p, 1071 FT_Byte maxEntry, 1072 FT_UShort stateArray, 1073 FT_UShort stateArray_length, 1074 FT_Byte maxClassID, 1075 FT_Bytes statetable_table, 1076 FT_Bytes statetable_limit, 1077 GXV_Validator gxvalid ) 1078 { 1079 FT_Bytes p = table; 1080 FT_Bytes limit = table + *length_p; 1081 FT_Byte entry; 1082 FT_Byte state; 1083 FT_Int entrySize = 2 + 2 + GXV_GLYPHOFFSET_SIZE( statetable ); 1084 1085 GXV_XStateTable_GlyphOffsetDesc glyphOffset; 1086 1087 1088 GXV_NAME_ENTER( "EntryTable" ); 1089 1090 GXV_TRACE(( "maxEntry=%d entrySize=%d\n", maxEntry, entrySize )); 1091 1092 if ( ( maxEntry + 1 ) * entrySize > *length_p ) 1093 { 1094 GXV_SET_ERR_IF_PARANOID( FT_INVALID_TOO_SHORT ); 1095 1096 /* ftxvalidator and FontValidator both warn and continue */ 1097 maxEntry = (FT_Byte)( *length_p / entrySize - 1 ); 1098 GXV_TRACE(( "too large maxEntry, shrinking to %d fit EntryTable length\n", 1099 maxEntry )); 1100 } 1101 1102 for ( entry = 0; entry <= maxEntry; entry++ ) 1103 { 1104 FT_UShort newState; 1105 FT_UShort flags; 1106 1107 1108 GXV_LIMIT_CHECK( 2 + 2 ); 1109 newState = FT_NEXT_USHORT( p ); 1110 flags = FT_NEXT_USHORT( p ); 1111 1112 1113 if ( newState < stateArray || 1114 stateArray + stateArray_length < newState ) 1115 { 1116 GXV_TRACE(( " newState offset 0x%04x is out of stateArray\n", 1117 newState )); 1118 GXV_SET_ERR_IF_PARANOID( FT_INVALID_OFFSET ); 1119 continue; 1120 } 1121 1122 if ( 0 != ( ( newState - stateArray ) % ( 1 + maxClassID ) ) ) 1123 { 1124 GXV_TRACE(( " newState offset 0x%04x is not aligned to %d-classes\n", 1125 newState, 1 + maxClassID )); 1126 GXV_SET_ERR_IF_PARANOID( FT_INVALID_OFFSET ); 1127 continue; 1128 } 1129 1130 state = (FT_Byte)( ( newState - stateArray ) / ( 1 + maxClassID ) ); 1131 1132 switch ( GXV_GLYPHOFFSET_FMT( statetable ) ) 1133 { 1134 case GXV_GLYPHOFFSET_NONE: 1135 glyphOffset.uc = 0; /* make compiler happy */ 1136 break; 1137 1138 case GXV_GLYPHOFFSET_UCHAR: 1139 glyphOffset.uc = FT_NEXT_BYTE( p ); 1140 break; 1141 1142 case GXV_GLYPHOFFSET_CHAR: 1143 glyphOffset.c = FT_NEXT_CHAR( p ); 1144 break; 1145 1146 case GXV_GLYPHOFFSET_USHORT: 1147 glyphOffset.u = FT_NEXT_USHORT( p ); 1148 break; 1149 1150 case GXV_GLYPHOFFSET_SHORT: 1151 glyphOffset.s = FT_NEXT_SHORT( p ); 1152 break; 1153 1154 case GXV_GLYPHOFFSET_ULONG: 1155 glyphOffset.ul = FT_NEXT_ULONG( p ); 1156 break; 1157 1158 case GXV_GLYPHOFFSET_LONG: 1159 glyphOffset.l = FT_NEXT_LONG( p ); 1160 break; 1161 } 1162 1163 if ( gxvalid->statetable.entry_validate_func ) 1164 gxvalid->statetable.entry_validate_func( state, 1165 flags, 1166 &glyphOffset, 1167 statetable_table, 1168 statetable_limit, 1169 gxvalid ); 1170 } 1171 1172 *length_p = (FT_UShort)( p - table ); 1173 1174 GXV_EXIT; 1175 } 1176 1177 1178 /* =========================== State Table ============================= */ 1179 1180 FT_LOCAL_DEF( void ) gxv_StateTable_subtable_setup(FT_UShort table_size,FT_UShort classTable,FT_UShort stateArray,FT_UShort entryTable,FT_UShort * classTable_length_p,FT_UShort * stateArray_length_p,FT_UShort * entryTable_length_p,GXV_Validator gxvalid)1181 gxv_StateTable_subtable_setup( FT_UShort table_size, 1182 FT_UShort classTable, 1183 FT_UShort stateArray, 1184 FT_UShort entryTable, 1185 FT_UShort* classTable_length_p, 1186 FT_UShort* stateArray_length_p, 1187 FT_UShort* entryTable_length_p, 1188 GXV_Validator gxvalid ) 1189 { 1190 FT_UShort o[3]; 1191 FT_UShort* l[3]; 1192 FT_UShort buff[4]; 1193 1194 1195 o[0] = classTable; 1196 o[1] = stateArray; 1197 o[2] = entryTable; 1198 l[0] = classTable_length_p; 1199 l[1] = stateArray_length_p; 1200 l[2] = entryTable_length_p; 1201 1202 gxv_set_length_by_ushort_offset( o, l, buff, 3, table_size, gxvalid ); 1203 } 1204 1205 1206 FT_LOCAL_DEF( void ) gxv_StateTable_validate(FT_Bytes table,FT_Bytes limit,GXV_Validator gxvalid)1207 gxv_StateTable_validate( FT_Bytes table, 1208 FT_Bytes limit, 1209 GXV_Validator gxvalid ) 1210 { 1211 FT_UShort stateSize; 1212 FT_UShort classTable; /* offset to Class(Sub)Table */ 1213 FT_UShort stateArray; /* offset to StateArray */ 1214 FT_UShort entryTable; /* offset to EntryTable */ 1215 1216 FT_UShort classTable_length; 1217 FT_UShort stateArray_length; 1218 FT_UShort entryTable_length; 1219 FT_Byte maxClassID; 1220 FT_Byte maxState; 1221 FT_Byte maxEntry; 1222 1223 GXV_StateTable_Subtable_Setup_Func setup_func; 1224 1225 FT_Bytes p = table; 1226 1227 1228 GXV_NAME_ENTER( "StateTable" ); 1229 1230 GXV_TRACE(( "StateTable header\n" )); 1231 1232 GXV_LIMIT_CHECK( 2 + 2 + 2 + 2 ); 1233 stateSize = FT_NEXT_USHORT( p ); 1234 classTable = FT_NEXT_USHORT( p ); 1235 stateArray = FT_NEXT_USHORT( p ); 1236 entryTable = FT_NEXT_USHORT( p ); 1237 1238 GXV_TRACE(( "stateSize=0x%04x\n", stateSize )); 1239 GXV_TRACE(( "offset to classTable=0x%04x\n", classTable )); 1240 GXV_TRACE(( "offset to stateArray=0x%04x\n", stateArray )); 1241 GXV_TRACE(( "offset to entryTable=0x%04x\n", entryTable )); 1242 1243 if ( stateSize > 0xFF ) 1244 FT_INVALID_DATA; 1245 1246 if ( gxvalid->statetable.optdata_load_func ) 1247 gxvalid->statetable.optdata_load_func( p, limit, gxvalid ); 1248 1249 if ( gxvalid->statetable.subtable_setup_func ) 1250 setup_func = gxvalid->statetable.subtable_setup_func; 1251 else 1252 setup_func = gxv_StateTable_subtable_setup; 1253 1254 setup_func( (FT_UShort)( limit - table ), 1255 classTable, 1256 stateArray, 1257 entryTable, 1258 &classTable_length, 1259 &stateArray_length, 1260 &entryTable_length, 1261 gxvalid ); 1262 1263 GXV_TRACE(( "StateTable Subtables\n" )); 1264 1265 if ( classTable != 0 ) 1266 gxv_ClassTable_validate( table + classTable, 1267 &classTable_length, 1268 stateSize, 1269 &maxClassID, 1270 gxvalid ); 1271 else 1272 maxClassID = (FT_Byte)( stateSize - 1 ); 1273 1274 if ( stateArray != 0 ) 1275 gxv_StateArray_validate( table + stateArray, 1276 &stateArray_length, 1277 maxClassID, 1278 stateSize, 1279 &maxState, 1280 &maxEntry, 1281 gxvalid ); 1282 else 1283 { 1284 #if 0 1285 maxState = 1; /* 0:start of text, 1:start of line are predefined */ 1286 #endif 1287 maxEntry = 0; 1288 } 1289 1290 if ( maxEntry > 0 && entryTable == 0 ) 1291 FT_INVALID_OFFSET; 1292 1293 if ( entryTable != 0 ) 1294 gxv_EntryTable_validate( table + entryTable, 1295 &entryTable_length, 1296 maxEntry, 1297 stateArray, 1298 stateArray_length, 1299 maxClassID, 1300 table, 1301 limit, 1302 gxvalid ); 1303 1304 GXV_EXIT; 1305 } 1306 1307 1308 /* ================= eXtended State Table (for morx) =================== */ 1309 1310 FT_LOCAL_DEF( void ) gxv_XStateTable_subtable_setup(FT_ULong table_size,FT_ULong classTable,FT_ULong stateArray,FT_ULong entryTable,FT_ULong * classTable_length_p,FT_ULong * stateArray_length_p,FT_ULong * entryTable_length_p,GXV_Validator gxvalid)1311 gxv_XStateTable_subtable_setup( FT_ULong table_size, 1312 FT_ULong classTable, 1313 FT_ULong stateArray, 1314 FT_ULong entryTable, 1315 FT_ULong* classTable_length_p, 1316 FT_ULong* stateArray_length_p, 1317 FT_ULong* entryTable_length_p, 1318 GXV_Validator gxvalid ) 1319 { 1320 FT_ULong o[3]; 1321 FT_ULong* l[3]; 1322 FT_ULong buff[4]; 1323 1324 1325 o[0] = classTable; 1326 o[1] = stateArray; 1327 o[2] = entryTable; 1328 l[0] = classTable_length_p; 1329 l[1] = stateArray_length_p; 1330 l[2] = entryTable_length_p; 1331 1332 gxv_set_length_by_ulong_offset( o, l, buff, 3, table_size, gxvalid ); 1333 } 1334 1335 1336 static void gxv_XClassTable_lookupval_validate(FT_UShort glyph,GXV_LookupValueCPtr value_p,GXV_Validator gxvalid)1337 gxv_XClassTable_lookupval_validate( FT_UShort glyph, 1338 GXV_LookupValueCPtr value_p, 1339 GXV_Validator gxvalid ) 1340 { 1341 FT_UNUSED( glyph ); 1342 1343 if ( value_p->u >= gxvalid->xstatetable.nClasses ) 1344 FT_INVALID_DATA; 1345 if ( value_p->u > gxvalid->xstatetable.maxClassID ) 1346 gxvalid->xstatetable.maxClassID = value_p->u; 1347 } 1348 1349 1350 /* 1351 +===============+ --------+ 1352 | lookup header | | 1353 +===============+ | 1354 | BinSrchHeader | | 1355 +===============+ | 1356 | lastGlyph[0] | | 1357 +---------------+ | 1358 | firstGlyph[0] | | head of lookup table 1359 +---------------+ | + 1360 | offset[0] | -> | offset [byte] 1361 +===============+ | + 1362 | lastGlyph[1] | | (glyphID - firstGlyph) * 2 [byte] 1363 +---------------+ | 1364 | firstGlyph[1] | | 1365 +---------------+ | 1366 | offset[1] | | 1367 +===============+ | 1368 | 1369 .... | 1370 | 1371 16bit value array | 1372 +===============+ | 1373 | value | <-------+ 1374 .... 1375 */ 1376 static GXV_LookupValueDesc gxv_XClassTable_lookupfmt4_transit(FT_UShort relative_gindex,GXV_LookupValueCPtr base_value_p,FT_Bytes lookuptbl_limit,GXV_Validator gxvalid)1377 gxv_XClassTable_lookupfmt4_transit( FT_UShort relative_gindex, 1378 GXV_LookupValueCPtr base_value_p, 1379 FT_Bytes lookuptbl_limit, 1380 GXV_Validator gxvalid ) 1381 { 1382 FT_Bytes p; 1383 FT_Bytes limit; 1384 FT_UShort offset; 1385 GXV_LookupValueDesc value; 1386 1387 /* XXX: check range? */ 1388 offset = (FT_UShort)( base_value_p->u + 1389 relative_gindex * sizeof ( FT_UShort ) ); 1390 1391 p = gxvalid->lookuptbl_head + offset; 1392 limit = lookuptbl_limit; 1393 1394 GXV_LIMIT_CHECK ( 2 ); 1395 value.u = FT_NEXT_USHORT( p ); 1396 1397 return value; 1398 } 1399 1400 1401 static void gxv_XStateArray_validate(FT_Bytes table,FT_ULong * length_p,FT_UShort maxClassID,FT_ULong stateSize,FT_UShort * maxState_p,FT_UShort * maxEntry_p,GXV_Validator gxvalid)1402 gxv_XStateArray_validate( FT_Bytes table, 1403 FT_ULong* length_p, 1404 FT_UShort maxClassID, 1405 FT_ULong stateSize, 1406 FT_UShort* maxState_p, 1407 FT_UShort* maxEntry_p, 1408 GXV_Validator gxvalid ) 1409 { 1410 FT_Bytes p = table; 1411 FT_Bytes limit = table + *length_p; 1412 FT_UShort clazz; 1413 FT_UShort entry; 1414 1415 FT_UNUSED( stateSize ); /* for the non-debugging case */ 1416 1417 1418 GXV_NAME_ENTER( "XStateArray" ); 1419 1420 GXV_TRACE(( "parse % 3d bytes by stateSize=% 3d maxClassID=% 3d\n", 1421 (int)(*length_p), (int)stateSize, (int)(maxClassID) )); 1422 1423 /* 1424 * 2 states are predefined and must be described: 1425 * state 0 (start of text), 1 (start of line) 1426 */ 1427 GXV_LIMIT_CHECK( ( 1 + maxClassID ) * 2 * 2 ); 1428 1429 *maxState_p = 0; 1430 *maxEntry_p = 0; 1431 1432 /* read if enough to read another state */ 1433 while ( p + ( ( 1 + maxClassID ) * 2 ) <= limit ) 1434 { 1435 (*maxState_p)++; 1436 for ( clazz = 0; clazz <= maxClassID; clazz++ ) 1437 { 1438 entry = FT_NEXT_USHORT( p ); 1439 *maxEntry_p = (FT_UShort)FT_MAX( *maxEntry_p, entry ); 1440 } 1441 } 1442 GXV_TRACE(( "parsed: maxState=%d, maxEntry=%d\n", 1443 *maxState_p, *maxEntry_p )); 1444 1445 *length_p = (FT_ULong)( p - table ); 1446 1447 GXV_EXIT; 1448 } 1449 1450 1451 static void gxv_XEntryTable_validate(FT_Bytes table,FT_ULong * length_p,FT_UShort maxEntry,FT_ULong stateArray_length,FT_UShort maxClassID,FT_Bytes xstatetable_table,FT_Bytes xstatetable_limit,GXV_Validator gxvalid)1452 gxv_XEntryTable_validate( FT_Bytes table, 1453 FT_ULong* length_p, 1454 FT_UShort maxEntry, 1455 FT_ULong stateArray_length, 1456 FT_UShort maxClassID, 1457 FT_Bytes xstatetable_table, 1458 FT_Bytes xstatetable_limit, 1459 GXV_Validator gxvalid ) 1460 { 1461 FT_Bytes p = table; 1462 FT_Bytes limit = table + *length_p; 1463 FT_UShort entry; 1464 FT_UShort state; 1465 FT_Int entrySize = 2 + 2 + GXV_GLYPHOFFSET_SIZE( xstatetable ); 1466 1467 1468 GXV_NAME_ENTER( "XEntryTable" ); 1469 GXV_TRACE(( "maxEntry=%d entrySize=%d\n", maxEntry, entrySize )); 1470 1471 if ( ( p + ( maxEntry + 1 ) * entrySize ) > limit ) 1472 FT_INVALID_TOO_SHORT; 1473 1474 for (entry = 0; entry <= maxEntry; entry++ ) 1475 { 1476 FT_UShort newState_idx; 1477 FT_UShort flags; 1478 GXV_XStateTable_GlyphOffsetDesc glyphOffset; 1479 1480 1481 GXV_LIMIT_CHECK( 2 + 2 ); 1482 newState_idx = FT_NEXT_USHORT( p ); 1483 flags = FT_NEXT_USHORT( p ); 1484 1485 if ( stateArray_length < (FT_ULong)( newState_idx * 2 ) ) 1486 { 1487 GXV_TRACE(( " newState index 0x%04x points out of stateArray\n", 1488 newState_idx )); 1489 GXV_SET_ERR_IF_PARANOID( FT_INVALID_OFFSET ); 1490 } 1491 1492 state = (FT_UShort)( newState_idx / ( 1 + maxClassID ) ); 1493 if ( 0 != ( newState_idx % ( 1 + maxClassID ) ) ) 1494 { 1495 FT_TRACE4(( "-> new state = %d (supposed)\n", 1496 state )); 1497 FT_TRACE4(( "but newState index 0x%04x" 1498 " is not aligned to %d-classes\n", 1499 newState_idx, 1 + maxClassID )); 1500 GXV_SET_ERR_IF_PARANOID( FT_INVALID_OFFSET ); 1501 } 1502 1503 switch ( GXV_GLYPHOFFSET_FMT( xstatetable ) ) 1504 { 1505 case GXV_GLYPHOFFSET_NONE: 1506 glyphOffset.uc = 0; /* make compiler happy */ 1507 break; 1508 1509 case GXV_GLYPHOFFSET_UCHAR: 1510 glyphOffset.uc = FT_NEXT_BYTE( p ); 1511 break; 1512 1513 case GXV_GLYPHOFFSET_CHAR: 1514 glyphOffset.c = FT_NEXT_CHAR( p ); 1515 break; 1516 1517 case GXV_GLYPHOFFSET_USHORT: 1518 glyphOffset.u = FT_NEXT_USHORT( p ); 1519 break; 1520 1521 case GXV_GLYPHOFFSET_SHORT: 1522 glyphOffset.s = FT_NEXT_SHORT( p ); 1523 break; 1524 1525 case GXV_GLYPHOFFSET_ULONG: 1526 glyphOffset.ul = FT_NEXT_ULONG( p ); 1527 break; 1528 1529 case GXV_GLYPHOFFSET_LONG: 1530 glyphOffset.l = FT_NEXT_LONG( p ); 1531 break; 1532 1533 default: 1534 GXV_SET_ERR_IF_PARANOID( FT_INVALID_FORMAT ); 1535 goto Exit; 1536 } 1537 1538 if ( gxvalid->xstatetable.entry_validate_func ) 1539 gxvalid->xstatetable.entry_validate_func( state, 1540 flags, 1541 &glyphOffset, 1542 xstatetable_table, 1543 xstatetable_limit, 1544 gxvalid ); 1545 } 1546 1547 Exit: 1548 *length_p = (FT_ULong)( p - table ); 1549 1550 GXV_EXIT; 1551 } 1552 1553 1554 FT_LOCAL_DEF( void ) gxv_XStateTable_validate(FT_Bytes table,FT_Bytes limit,GXV_Validator gxvalid)1555 gxv_XStateTable_validate( FT_Bytes table, 1556 FT_Bytes limit, 1557 GXV_Validator gxvalid ) 1558 { 1559 /* StateHeader members */ 1560 FT_ULong classTable; /* offset to Class(Sub)Table */ 1561 FT_ULong stateArray; /* offset to StateArray */ 1562 FT_ULong entryTable; /* offset to EntryTable */ 1563 1564 FT_ULong classTable_length; 1565 FT_ULong stateArray_length; 1566 FT_ULong entryTable_length; 1567 FT_UShort maxState; 1568 FT_UShort maxEntry; 1569 1570 GXV_XStateTable_Subtable_Setup_Func setup_func; 1571 1572 FT_Bytes p = table; 1573 1574 1575 GXV_NAME_ENTER( "XStateTable" ); 1576 1577 GXV_TRACE(( "XStateTable header\n" )); 1578 1579 GXV_LIMIT_CHECK( 4 + 4 + 4 + 4 ); 1580 gxvalid->xstatetable.nClasses = FT_NEXT_ULONG( p ); 1581 classTable = FT_NEXT_ULONG( p ); 1582 stateArray = FT_NEXT_ULONG( p ); 1583 entryTable = FT_NEXT_ULONG( p ); 1584 1585 GXV_TRACE(( "nClasses =0x%08lx\n", gxvalid->xstatetable.nClasses )); 1586 GXV_TRACE(( "offset to classTable=0x%08lx\n", classTable )); 1587 GXV_TRACE(( "offset to stateArray=0x%08lx\n", stateArray )); 1588 GXV_TRACE(( "offset to entryTable=0x%08lx\n", entryTable )); 1589 1590 if ( gxvalid->xstatetable.nClasses > 0xFFFFU ) 1591 FT_INVALID_DATA; 1592 1593 GXV_TRACE(( "StateTable Subtables\n" )); 1594 1595 if ( gxvalid->xstatetable.optdata_load_func ) 1596 gxvalid->xstatetable.optdata_load_func( p, limit, gxvalid ); 1597 1598 if ( gxvalid->xstatetable.subtable_setup_func ) 1599 setup_func = gxvalid->xstatetable.subtable_setup_func; 1600 else 1601 setup_func = gxv_XStateTable_subtable_setup; 1602 1603 setup_func( (FT_ULong)( limit - table ), 1604 classTable, 1605 stateArray, 1606 entryTable, 1607 &classTable_length, 1608 &stateArray_length, 1609 &entryTable_length, 1610 gxvalid ); 1611 1612 if ( classTable != 0 ) 1613 { 1614 gxvalid->xstatetable.maxClassID = 0; 1615 gxvalid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED; 1616 gxvalid->lookupval_func = gxv_XClassTable_lookupval_validate; 1617 gxvalid->lookupfmt4_trans = gxv_XClassTable_lookupfmt4_transit; 1618 gxv_LookupTable_validate( table + classTable, 1619 table + classTable + classTable_length, 1620 gxvalid ); 1621 #if 0 1622 if ( gxvalid->subtable_length < classTable_length ) 1623 classTable_length = gxvalid->subtable_length; 1624 #endif 1625 } 1626 else 1627 { 1628 /* XXX: check range? */ 1629 gxvalid->xstatetable.maxClassID = 1630 (FT_UShort)( gxvalid->xstatetable.nClasses - 1 ); 1631 } 1632 1633 if ( stateArray != 0 ) 1634 gxv_XStateArray_validate( table + stateArray, 1635 &stateArray_length, 1636 gxvalid->xstatetable.maxClassID, 1637 gxvalid->xstatetable.nClasses, 1638 &maxState, 1639 &maxEntry, 1640 gxvalid ); 1641 else 1642 { 1643 #if 0 1644 maxState = 1; /* 0:start of text, 1:start of line are predefined */ 1645 #endif 1646 maxEntry = 0; 1647 } 1648 1649 if ( maxEntry > 0 && entryTable == 0 ) 1650 FT_INVALID_OFFSET; 1651 1652 if ( entryTable != 0 ) 1653 gxv_XEntryTable_validate( table + entryTable, 1654 &entryTable_length, 1655 maxEntry, 1656 stateArray_length, 1657 gxvalid->xstatetable.maxClassID, 1658 table, 1659 limit, 1660 gxvalid ); 1661 1662 GXV_EXIT; 1663 } 1664 1665 1666 /*************************************************************************/ 1667 /*************************************************************************/ 1668 /***** *****/ 1669 /***** Table overlapping *****/ 1670 /***** *****/ 1671 /*************************************************************************/ 1672 /*************************************************************************/ 1673 1674 static int gxv_compare_ranges(FT_Bytes table1_start,FT_ULong table1_length,FT_Bytes table2_start,FT_ULong table2_length)1675 gxv_compare_ranges( FT_Bytes table1_start, 1676 FT_ULong table1_length, 1677 FT_Bytes table2_start, 1678 FT_ULong table2_length ) 1679 { 1680 if ( table1_start == table2_start ) 1681 { 1682 if ( ( table1_length == 0 || table2_length == 0 ) ) 1683 goto Out; 1684 } 1685 else if ( table1_start < table2_start ) 1686 { 1687 if ( ( table1_start + table1_length ) <= table2_start ) 1688 goto Out; 1689 } 1690 else if ( table1_start > table2_start ) 1691 { 1692 if ( ( table1_start >= table2_start + table2_length ) ) 1693 goto Out; 1694 } 1695 return 1; 1696 1697 Out: 1698 return 0; 1699 } 1700 1701 1702 FT_LOCAL_DEF( void ) gxv_odtect_add_range(FT_Bytes start,FT_ULong length,const FT_String * name,GXV_odtect_Range odtect)1703 gxv_odtect_add_range( FT_Bytes start, 1704 FT_ULong length, 1705 const FT_String* name, 1706 GXV_odtect_Range odtect ) 1707 { 1708 odtect->range[odtect->nRanges].start = start; 1709 odtect->range[odtect->nRanges].length = length; 1710 odtect->range[odtect->nRanges].name = (FT_String*)name; 1711 odtect->nRanges++; 1712 } 1713 1714 1715 FT_LOCAL_DEF( void ) gxv_odtect_validate(GXV_odtect_Range odtect,GXV_Validator gxvalid)1716 gxv_odtect_validate( GXV_odtect_Range odtect, 1717 GXV_Validator gxvalid ) 1718 { 1719 FT_UInt i, j; 1720 1721 1722 GXV_NAME_ENTER( "check overlap among multi ranges" ); 1723 1724 for ( i = 0; i < odtect->nRanges; i++ ) 1725 for ( j = 0; j < i; j++ ) 1726 if ( 0 != gxv_compare_ranges( odtect->range[i].start, 1727 odtect->range[i].length, 1728 odtect->range[j].start, 1729 odtect->range[j].length ) ) 1730 { 1731 #ifdef FT_DEBUG_LEVEL_TRACE 1732 if ( odtect->range[i].name || odtect->range[j].name ) 1733 GXV_TRACE(( "found overlap between range %d and range %d\n", 1734 i, j )); 1735 else 1736 GXV_TRACE(( "found overlap between `%s' and `%s\'\n", 1737 odtect->range[i].name, 1738 odtect->range[j].name )); 1739 #endif 1740 FT_INVALID_OFFSET; 1741 } 1742 1743 GXV_EXIT; 1744 } 1745 1746 1747 /* END */ 1748