pfrload.c (28988B)
1 /**************************************************************************** 2 * 3 * pfrload.c 4 * 5 * FreeType PFR loader (body). 6 * 7 * Copyright (C) 2002-2025 by 8 * David Turner, Robert Wilhelm, and Werner Lemberg. 9 * 10 * This file is part of the FreeType project, and may only be used, 11 * modified, and distributed under the terms of the FreeType project 12 * license, LICENSE.TXT. By continuing to use, modify, or distribute 13 * this file you indicate that you have read the license and 14 * understand and accept it fully. 15 * 16 */ 17 18 19 #include "pfrload.h" 20 #include <freetype/internal/ftdebug.h> 21 #include <freetype/internal/ftstream.h> 22 23 #include "pfrerror.h" 24 25 #undef FT_COMPONENT 26 #define FT_COMPONENT pfr 27 28 29 /* 30 * The overall structure of a PFR file is as follows. 31 * 32 * PFR header 33 * 58 bytes (contains nPhysFonts) 34 * 35 * Logical font directory (size at most 2^16 bytes) 36 * 2 bytes (nLogFonts) 37 * + nLogFonts * 5 bytes 38 * 39 * ==> nLogFonts <= 13106 40 * 41 * Logical font section (size at most 2^24 bytes) 42 * nLogFonts * logFontRecord 43 * 44 * logFontRecord (size at most 2^16 bytes) 45 * 12 bytes (fontMatrix) 46 * + 1 byte (flags) 47 * + 0-5 bytes (depending on `flags') 48 * + 0-(1+255*(2+255)) = 0-65536 (depending on `flags') 49 * + 5 bytes (physical font info) 50 * + 0-1 bytes (depending on PFR header) 51 * 52 * ==> minimum size 18 bytes 53 * 54 * Physical font section (size at most 2^24 bytes) 55 * nPhysFonts * (physFontRecord 56 * + nBitmapSizes * nBmapChars * bmapCharRecord) 57 * 58 * physFontRecord (size at most 2^24 bytes) 59 * 14 bytes (font info) 60 * + 1 byte (flags) 61 * + 0-2 (depending on `flags') 62 * + 0-? (structure too complicated to be shown here; depending on 63 * `flags'; contains `nBitmapSizes' and `nBmapChars') 64 * + 3 bytes (nAuxBytes) 65 * + nAuxBytes 66 * + 1 byte (nBlueValues) 67 * + 2 * nBlueValues 68 * + 6 bytes (hinting data) 69 * + 2 bytes (nCharacters) 70 * + nCharacters * (4-10 bytes) (depending on `flags') 71 * 72 * ==> minimum size 27 bytes 73 * 74 * bmapCharRecord 75 * 4-7 bytes 76 * 77 * Glyph program strings (three possible types: simpleGps, compoundGps, 78 * and bitmapGps; size at most 2^24 bytes) 79 * simpleGps (size at most 2^16 bytes) 80 * 1 byte (flags) 81 * 1-2 bytes (n[XY]orus, depending on `flags') 82 * 0-(64+512*2) = 0-1088 bytes (depending on `n[XY]orus') 83 * 0-? (structure too complicated to be shown here; depending on 84 * `flags') 85 * 1-? glyph data (faintly resembling PS Type 1 charstrings) 86 * 87 * ==> minimum size 3 bytes 88 * 89 * compoundGps (size at most 2^16 bytes) 90 * 1 byte (nElements <= 63, flags) 91 * + 0-(1+255*(2+255)) = 0-65536 (depending on `flags') 92 * + nElements * (6-14 bytes) 93 * 94 * bitmapGps (size at most 2^16 bytes) 95 * 1 byte (flags) 96 * 3-13 bytes (position info, depending on `flags') 97 * 0-? bitmap data 98 * 99 * ==> minimum size 4 bytes 100 * 101 * PFR trailer 102 * 8 bytes 103 * 104 * 105 * ==> minimum size of a valid PFR: 106 * 58 (header) 107 * + 2 (nLogFonts) 108 * + 27 (1 physFontRecord) 109 * + 8 (trailer) 110 * ----- 111 * 95 bytes 112 * 113 */ 114 115 116 /*************************************************************************/ 117 /*************************************************************************/ 118 /***** *****/ 119 /***** EXTRA ITEMS *****/ 120 /***** *****/ 121 /*************************************************************************/ 122 /*************************************************************************/ 123 124 125 FT_LOCAL_DEF( FT_Error ) 126 pfr_extra_items_skip( FT_Byte* *pp, 127 FT_Byte* limit ) 128 { 129 return pfr_extra_items_parse( pp, limit, NULL, NULL ); 130 } 131 132 133 FT_LOCAL_DEF( FT_Error ) 134 pfr_extra_items_parse( FT_Byte* *pp, 135 FT_Byte* limit, 136 PFR_ExtraItem item_list, 137 FT_Pointer item_data ) 138 { 139 FT_Error error = FT_Err_Ok; 140 FT_Byte* p = *pp; 141 FT_UInt num_items, item_type, item_size; 142 143 144 PFR_CHECK( 1 ); 145 num_items = PFR_NEXT_BYTE( p ); 146 147 for ( ; num_items > 0; num_items-- ) 148 { 149 PFR_CHECK( 2 ); 150 item_size = PFR_NEXT_BYTE( p ); 151 item_type = PFR_NEXT_BYTE( p ); 152 153 PFR_CHECK( item_size ); 154 155 if ( item_list ) 156 { 157 PFR_ExtraItem extra = item_list; 158 159 160 for ( extra = item_list; extra->parser != NULL; extra++ ) 161 { 162 if ( extra->type == item_type ) 163 { 164 error = extra->parser( p, p + item_size, item_data ); 165 if ( error ) 166 goto Exit; 167 168 break; 169 } 170 } 171 } 172 173 p += item_size; 174 } 175 176 Exit: 177 *pp = p; 178 return error; 179 180 Too_Short: 181 FT_ERROR(( "pfr_extra_items_parse: invalid extra items table\n" )); 182 error = FT_THROW( Invalid_Table ); 183 goto Exit; 184 } 185 186 187 /*************************************************************************/ 188 /*************************************************************************/ 189 /***** *****/ 190 /***** PFR HEADER *****/ 191 /***** *****/ 192 /*************************************************************************/ 193 /*************************************************************************/ 194 195 static const FT_Frame_Field pfr_header_fields[] = 196 { 197 #undef FT_STRUCTURE 198 #define FT_STRUCTURE PFR_HeaderRec 199 200 FT_FRAME_START( 58 ), 201 FT_FRAME_ULONG ( signature ), 202 FT_FRAME_USHORT( version ), 203 FT_FRAME_USHORT( signature2 ), 204 FT_FRAME_USHORT( header_size ), 205 206 FT_FRAME_USHORT( log_dir_size ), 207 FT_FRAME_USHORT( log_dir_offset ), 208 209 FT_FRAME_USHORT( log_font_max_size ), 210 FT_FRAME_UOFF3 ( log_font_section_size ), 211 FT_FRAME_UOFF3 ( log_font_section_offset ), 212 213 FT_FRAME_USHORT( phy_font_max_size ), 214 FT_FRAME_UOFF3 ( phy_font_section_size ), 215 FT_FRAME_UOFF3 ( phy_font_section_offset ), 216 217 FT_FRAME_USHORT( gps_max_size ), 218 FT_FRAME_UOFF3 ( gps_section_size ), 219 FT_FRAME_UOFF3 ( gps_section_offset ), 220 221 FT_FRAME_BYTE ( max_blue_values ), 222 FT_FRAME_BYTE ( max_x_orus ), 223 FT_FRAME_BYTE ( max_y_orus ), 224 225 FT_FRAME_BYTE ( phy_font_max_size_high ), 226 FT_FRAME_BYTE ( color_flags ), 227 228 FT_FRAME_UOFF3 ( bct_max_size ), 229 FT_FRAME_UOFF3 ( bct_set_max_size ), 230 FT_FRAME_UOFF3 ( phy_bct_set_max_size ), 231 232 FT_FRAME_USHORT( num_phy_fonts ), 233 FT_FRAME_BYTE ( max_vert_stem_snap ), 234 FT_FRAME_BYTE ( max_horz_stem_snap ), 235 FT_FRAME_USHORT( max_chars ), 236 FT_FRAME_END 237 }; 238 239 240 FT_LOCAL_DEF( FT_Error ) 241 pfr_header_load( PFR_Header header, 242 FT_Stream stream ) 243 { 244 FT_Error error; 245 246 247 /* read header directly */ 248 if ( !FT_STREAM_SEEK( 0 ) && 249 !FT_STREAM_READ_FIELDS( pfr_header_fields, header ) ) 250 { 251 /* make a few adjustments to the header */ 252 header->phy_font_max_size += 253 (FT_UInt32)header->phy_font_max_size_high << 16; 254 } 255 256 return error; 257 } 258 259 260 FT_LOCAL_DEF( FT_Bool ) 261 pfr_header_check( PFR_Header header ) 262 { 263 FT_Bool result = 1; 264 265 266 /* check signature and header size */ 267 if ( header->signature != 0x50465230L || /* "PFR0" */ 268 header->version > 4 || 269 header->header_size < 58 || 270 header->signature2 != 0x0D0A ) /* CR/LF */ 271 result = 0; 272 273 return result; 274 } 275 276 277 /***********************************************************************/ 278 /***********************************************************************/ 279 /***** *****/ 280 /***** PFR LOGICAL FONTS *****/ 281 /***** *****/ 282 /***********************************************************************/ 283 /***********************************************************************/ 284 285 286 FT_LOCAL_DEF( FT_Error ) 287 pfr_log_font_count( FT_Stream stream, 288 FT_UInt32 section_offset, 289 FT_Long *acount ) 290 { 291 FT_Error error; 292 FT_UInt count; 293 FT_UInt result = 0; 294 295 296 if ( FT_STREAM_SEEK( section_offset ) || 297 FT_READ_USHORT( count ) ) 298 goto Exit; 299 300 /* check maximum value and a rough minimum size: */ 301 /* - no more than 13106 log fonts */ 302 /* - we need 5 bytes for a log header record */ 303 /* - we need at least 18 bytes for a log font record */ 304 /* - the overall size is at least 95 bytes plus the */ 305 /* log header and log font records */ 306 if ( count > ( ( 1 << 16 ) - 2 ) / 5 || 307 2 + count * 5 >= stream->size - section_offset || 308 95 + count * ( 5 + 18 ) >= stream->size ) 309 { 310 FT_ERROR(( "pfr_log_font_count:" 311 " invalid number of logical fonts\n" )); 312 error = FT_THROW( Invalid_Table ); 313 goto Exit; 314 } 315 316 result = count; 317 318 Exit: 319 *acount = (FT_Long)result; 320 return error; 321 } 322 323 324 FT_LOCAL_DEF( FT_Error ) 325 pfr_log_font_load( PFR_LogFont log_font, 326 FT_Stream stream, 327 FT_UInt idx, 328 FT_UInt32 section_offset, 329 FT_Bool size_increment ) 330 { 331 FT_UInt num_log_fonts; 332 FT_UInt flags; 333 FT_UInt32 offset; 334 FT_UInt32 size; 335 FT_Error error; 336 337 338 if ( FT_STREAM_SEEK( section_offset ) || 339 FT_READ_USHORT( num_log_fonts ) ) 340 goto Exit; 341 342 if ( idx >= num_log_fonts ) 343 return FT_THROW( Invalid_Argument ); 344 345 if ( FT_STREAM_SKIP( idx * 5 ) || 346 FT_READ_USHORT( size ) || 347 FT_READ_UOFF3 ( offset ) ) 348 goto Exit; 349 350 /* save logical font size and offset */ 351 log_font->size = size; 352 log_font->offset = offset; 353 354 /* now, check the rest of the table before loading it */ 355 { 356 FT_Byte* p; 357 FT_Byte* limit; 358 FT_UInt local; 359 360 361 if ( FT_STREAM_SEEK( offset ) || 362 FT_FRAME_ENTER( size ) ) 363 goto Exit; 364 365 p = stream->cursor; 366 limit = p + size; 367 368 PFR_CHECK( 13 ); 369 370 log_font->matrix[0] = PFR_NEXT_LONG( p ); 371 log_font->matrix[1] = PFR_NEXT_LONG( p ); 372 log_font->matrix[2] = PFR_NEXT_LONG( p ); 373 log_font->matrix[3] = PFR_NEXT_LONG( p ); 374 375 flags = PFR_NEXT_BYTE( p ); 376 377 local = 0; 378 if ( flags & PFR_LOG_STROKE ) 379 { 380 local++; 381 if ( flags & PFR_LOG_2BYTE_STROKE ) 382 local++; 383 384 if ( ( flags & PFR_LINE_JOIN_MASK ) == PFR_LINE_JOIN_MITER ) 385 local += 3; 386 } 387 if ( flags & PFR_LOG_BOLD ) 388 { 389 local++; 390 if ( flags & PFR_LOG_2BYTE_BOLD ) 391 local++; 392 } 393 394 PFR_CHECK( local ); 395 396 if ( flags & PFR_LOG_STROKE ) 397 { 398 log_font->stroke_thickness = ( flags & PFR_LOG_2BYTE_STROKE ) 399 ? PFR_NEXT_SHORT( p ) 400 : PFR_NEXT_BYTE( p ); 401 402 if ( ( flags & PFR_LINE_JOIN_MASK ) == PFR_LINE_JOIN_MITER ) 403 log_font->miter_limit = PFR_NEXT_LONG( p ); 404 } 405 406 if ( flags & PFR_LOG_BOLD ) 407 log_font->bold_thickness = ( flags & PFR_LOG_2BYTE_BOLD ) 408 ? PFR_NEXT_SHORT( p ) 409 : PFR_NEXT_BYTE( p ); 410 411 if ( flags & PFR_LOG_EXTRA_ITEMS ) 412 { 413 error = pfr_extra_items_skip( &p, limit ); 414 if ( error ) 415 goto Fail; 416 } 417 418 PFR_CHECK( 5 ); 419 log_font->phys_size = PFR_NEXT_USHORT( p ); 420 log_font->phys_offset = PFR_NEXT_ULONG( p ); 421 if ( size_increment ) 422 { 423 PFR_CHECK( 1 ); 424 log_font->phys_size += (FT_UInt32)PFR_NEXT_BYTE( p ) << 16; 425 } 426 } 427 428 Fail: 429 FT_FRAME_EXIT(); 430 431 Exit: 432 return error; 433 434 Too_Short: 435 FT_ERROR(( "pfr_log_font_load: invalid logical font table\n" )); 436 error = FT_THROW( Invalid_Table ); 437 goto Fail; 438 } 439 440 441 /***********************************************************************/ 442 /***********************************************************************/ 443 /***** *****/ 444 /***** PFR PHYSICAL FONTS *****/ 445 /***** *****/ 446 /***********************************************************************/ 447 /***********************************************************************/ 448 449 450 /* load bitmap strikes lists */ 451 FT_CALLBACK_DEF( FT_Error ) 452 pfr_extra_item_load_bitmap_info( FT_Byte* p, 453 FT_Byte* limit, 454 void* phy_font_ ) 455 { 456 PFR_PhyFont phy_font = (PFR_PhyFont)phy_font_; 457 FT_Memory memory = phy_font->memory; 458 PFR_Strike strike; 459 FT_UInt flags0; 460 FT_UInt n, count, size1; 461 FT_Error error = FT_Err_Ok; 462 463 464 PFR_CHECK( 5 ); 465 466 p += 3; /* skip bctSize */ 467 flags0 = PFR_NEXT_BYTE( p ); 468 count = PFR_NEXT_BYTE( p ); 469 470 /* re-allocate when needed */ 471 if ( phy_font->num_strikes + count > phy_font->max_strikes ) 472 { 473 FT_UInt new_max = FT_PAD_CEIL( phy_font->num_strikes + count, 4 ); 474 475 476 if ( FT_RENEW_ARRAY( phy_font->strikes, 477 phy_font->num_strikes, 478 new_max ) ) 479 goto Exit; 480 481 phy_font->max_strikes = new_max; 482 } 483 484 size1 = 1 + 1 + 1 + 2 + 2 + 1; 485 if ( flags0 & PFR_STRIKE_2BYTE_XPPM ) 486 size1++; 487 488 if ( flags0 & PFR_STRIKE_2BYTE_YPPM ) 489 size1++; 490 491 if ( flags0 & PFR_STRIKE_3BYTE_SIZE ) 492 size1++; 493 494 if ( flags0 & PFR_STRIKE_3BYTE_OFFSET ) 495 size1++; 496 497 if ( flags0 & PFR_STRIKE_2BYTE_COUNT ) 498 size1++; 499 500 strike = phy_font->strikes + phy_font->num_strikes; 501 502 PFR_CHECK( count * size1 ); 503 504 for ( n = 0; n < count; n++, strike++ ) 505 { 506 strike->x_ppm = ( flags0 & PFR_STRIKE_2BYTE_XPPM ) 507 ? PFR_NEXT_USHORT( p ) 508 : PFR_NEXT_BYTE( p ); 509 510 strike->y_ppm = ( flags0 & PFR_STRIKE_2BYTE_YPPM ) 511 ? PFR_NEXT_USHORT( p ) 512 : PFR_NEXT_BYTE( p ); 513 514 strike->flags = PFR_NEXT_BYTE( p ); 515 516 strike->bct_size = ( flags0 & PFR_STRIKE_3BYTE_SIZE ) 517 ? PFR_NEXT_ULONG( p ) 518 : PFR_NEXT_USHORT( p ); 519 520 strike->bct_offset = ( flags0 & PFR_STRIKE_3BYTE_OFFSET ) 521 ? PFR_NEXT_ULONG( p ) 522 : PFR_NEXT_USHORT( p ); 523 524 strike->num_bitmaps = ( flags0 & PFR_STRIKE_2BYTE_COUNT ) 525 ? PFR_NEXT_USHORT( p ) 526 : PFR_NEXT_BYTE( p ); 527 } 528 529 phy_font->num_strikes += count; 530 531 Exit: 532 return error; 533 534 Too_Short: 535 error = FT_THROW( Invalid_Table ); 536 FT_ERROR(( "pfr_extra_item_load_bitmap_info:" 537 " invalid bitmap info table\n" )); 538 goto Exit; 539 } 540 541 542 /* Load font ID. This is a so-called `unique' name that is rather 543 * long and descriptive (like `Tiresias ScreenFont v7.51'). 544 * 545 * Note that a PFR font's family name is contained in an *undocumented* 546 * string of the `auxiliary data' portion of a physical font record. This 547 * may also contain the `real' style name! 548 * 549 * If no family name is present, the font ID is used instead for the 550 * family. 551 */ 552 FT_CALLBACK_DEF( FT_Error ) 553 pfr_extra_item_load_font_id( FT_Byte* p, 554 FT_Byte* limit, 555 void* phy_font_ ) 556 { 557 PFR_PhyFont phy_font = (PFR_PhyFont)phy_font_; 558 FT_Error error = FT_Err_Ok; 559 FT_Memory memory = phy_font->memory; 560 FT_UInt len = (FT_UInt)( limit - p ); 561 562 563 if ( phy_font->font_id ) 564 goto Exit; 565 566 if ( FT_QALLOC( phy_font->font_id, len + 1 ) ) 567 goto Exit; 568 569 /* copy font ID name, and terminate it for safety */ 570 FT_MEM_COPY( phy_font->font_id, p, len ); 571 phy_font->font_id[len] = 0; 572 573 Exit: 574 return error; 575 } 576 577 578 /* load stem snap tables */ 579 FT_CALLBACK_DEF( FT_Error ) 580 pfr_extra_item_load_stem_snaps( FT_Byte* p, 581 FT_Byte* limit, 582 void* phy_font_ ) 583 { 584 PFR_PhyFont phy_font = (PFR_PhyFont)phy_font_; 585 FT_UInt count, num_vert, num_horz; 586 FT_Int* snaps = NULL; 587 FT_Error error = FT_Err_Ok; 588 FT_Memory memory = phy_font->memory; 589 590 591 if ( phy_font->vertical.stem_snaps ) 592 goto Exit; 593 594 PFR_CHECK( 1 ); 595 count = PFR_NEXT_BYTE( p ); 596 597 num_vert = count & 15; 598 num_horz = count >> 4; 599 count = num_vert + num_horz; 600 601 PFR_CHECK( count * 2 ); 602 603 if ( FT_QNEW_ARRAY( snaps, count ) ) 604 goto Exit; 605 606 phy_font->vertical.stem_snaps = snaps; 607 phy_font->horizontal.stem_snaps = snaps + num_vert; 608 609 for ( ; count > 0; count--, snaps++ ) 610 *snaps = FT_NEXT_SHORT( p ); 611 612 Exit: 613 return error; 614 615 Too_Short: 616 error = FT_THROW( Invalid_Table ); 617 FT_ERROR(( "pfr_extra_item_load_stem_snaps:" 618 " invalid stem snaps table\n" )); 619 goto Exit; 620 } 621 622 623 /* load kerning pair data */ 624 FT_CALLBACK_DEF( FT_Error ) 625 pfr_extra_item_load_kerning_pairs( FT_Byte* p, 626 FT_Byte* limit, 627 void* phy_font_ ) 628 { 629 PFR_PhyFont phy_font = (PFR_PhyFont)phy_font_; 630 PFR_KernItem item = NULL; 631 FT_Error error = FT_Err_Ok; 632 FT_Memory memory = phy_font->memory; 633 634 635 if ( FT_NEW( item ) ) 636 goto Exit; 637 638 PFR_CHECK( 4 ); 639 640 item->pair_count = PFR_NEXT_BYTE( p ); 641 item->base_adj = PFR_NEXT_SHORT( p ); 642 item->flags = PFR_NEXT_BYTE( p ); 643 item->offset = phy_font->offset + 644 (FT_Offset)( p - phy_font->cursor ); 645 646 #ifndef PFR_CONFIG_NO_CHECKS 647 item->pair_size = 3; 648 649 if ( item->flags & PFR_KERN_2BYTE_CHAR ) 650 item->pair_size += 2; 651 652 if ( item->flags & PFR_KERN_2BYTE_ADJ ) 653 item->pair_size += 1; 654 655 PFR_CHECK( item->pair_count * item->pair_size ); 656 #endif 657 658 /* load first and last pairs into the item to speed up */ 659 /* lookup later... */ 660 if ( item->pair_count > 0 ) 661 { 662 FT_UInt char1, char2; 663 FT_Byte* q; 664 665 666 if ( item->flags & PFR_KERN_2BYTE_CHAR ) 667 { 668 q = p; 669 char1 = PFR_NEXT_USHORT( q ); 670 char2 = PFR_NEXT_USHORT( q ); 671 672 item->pair1 = PFR_KERN_INDEX( char1, char2 ); 673 674 q = p + item->pair_size * ( item->pair_count - 1 ); 675 char1 = PFR_NEXT_USHORT( q ); 676 char2 = PFR_NEXT_USHORT( q ); 677 678 item->pair2 = PFR_KERN_INDEX( char1, char2 ); 679 } 680 else 681 { 682 q = p; 683 char1 = PFR_NEXT_BYTE( q ); 684 char2 = PFR_NEXT_BYTE( q ); 685 686 item->pair1 = PFR_KERN_INDEX( char1, char2 ); 687 688 q = p + item->pair_size * ( item->pair_count - 1 ); 689 char1 = PFR_NEXT_BYTE( q ); 690 char2 = PFR_NEXT_BYTE( q ); 691 692 item->pair2 = PFR_KERN_INDEX( char1, char2 ); 693 } 694 695 /* add new item to the current list */ 696 item->next = NULL; 697 *phy_font->kern_items_tail = item; 698 phy_font->kern_items_tail = &item->next; 699 phy_font->num_kern_pairs += item->pair_count; 700 } 701 else 702 { 703 /* empty item! */ 704 FT_FREE( item ); 705 } 706 707 Exit: 708 return error; 709 710 Too_Short: 711 FT_FREE( item ); 712 713 error = FT_THROW( Invalid_Table ); 714 FT_ERROR(( "pfr_extra_item_load_kerning_pairs:" 715 " invalid kerning pairs table\n" )); 716 goto Exit; 717 } 718 719 720 static const PFR_ExtraItemRec pfr_phy_font_extra_items[] = 721 { 722 { 1, pfr_extra_item_load_bitmap_info }, 723 { 2, pfr_extra_item_load_font_id }, 724 { 3, pfr_extra_item_load_stem_snaps }, 725 { 4, pfr_extra_item_load_kerning_pairs }, 726 { 0, NULL } 727 }; 728 729 730 /* 731 * Load a name from the auxiliary data. Since this extracts undocumented 732 * strings from the font file, we need to be careful here. 733 */ 734 static FT_Error 735 pfr_aux_name_load( FT_Byte* p, 736 FT_UInt len, 737 FT_Memory memory, 738 FT_String* *astring ) 739 { 740 FT_Error error = FT_Err_Ok; 741 FT_String* result = NULL; 742 FT_UInt n, ok; 743 744 745 if ( *astring ) 746 FT_FREE( *astring ); 747 748 if ( len > 0 && p[len - 1] == 0 ) 749 len--; 750 751 /* check that each character is ASCII */ 752 /* for making sure not to load garbage */ 753 ok = ( len > 0 ); 754 for ( n = 0; n < len; n++ ) 755 if ( p[n] < 32 || p[n] > 127 ) 756 { 757 ok = 0; 758 break; 759 } 760 761 if ( ok ) 762 { 763 if ( FT_QALLOC( result, len + 1 ) ) 764 goto Exit; 765 766 FT_MEM_COPY( result, p, len ); 767 result[len] = 0; 768 } 769 770 Exit: 771 *astring = result; 772 return error; 773 } 774 775 776 FT_LOCAL_DEF( void ) 777 pfr_phy_font_done( PFR_PhyFont phy_font, 778 FT_Memory memory ) 779 { 780 FT_FREE( phy_font->font_id ); 781 FT_FREE( phy_font->family_name ); 782 FT_FREE( phy_font->style_name ); 783 784 FT_FREE( phy_font->vertical.stem_snaps ); 785 phy_font->vertical.num_stem_snaps = 0; 786 787 phy_font->horizontal.stem_snaps = NULL; 788 phy_font->horizontal.num_stem_snaps = 0; 789 790 FT_FREE( phy_font->strikes ); 791 phy_font->num_strikes = 0; 792 phy_font->max_strikes = 0; 793 794 FT_FREE( phy_font->chars ); 795 phy_font->num_chars = 0; 796 phy_font->chars_offset = 0; 797 798 FT_FREE( phy_font->blue_values ); 799 phy_font->num_blue_values = 0; 800 801 { 802 PFR_KernItem item, next; 803 804 805 item = phy_font->kern_items; 806 while ( item ) 807 { 808 next = item->next; 809 FT_FREE( item ); 810 item = next; 811 } 812 phy_font->kern_items = NULL; 813 phy_font->kern_items_tail = NULL; 814 } 815 816 phy_font->num_kern_pairs = 0; 817 } 818 819 820 FT_LOCAL_DEF( FT_Error ) 821 pfr_phy_font_load( PFR_PhyFont phy_font, 822 FT_Stream stream, 823 FT_UInt32 offset, 824 FT_UInt32 size ) 825 { 826 FT_Error error; 827 FT_Memory memory = stream->memory; 828 FT_UInt flags; 829 FT_ULong num_aux; 830 FT_Byte* p; 831 FT_Byte* limit; 832 833 834 phy_font->memory = memory; 835 phy_font->offset = offset; 836 837 phy_font->kern_items = NULL; 838 phy_font->kern_items_tail = &phy_font->kern_items; 839 840 if ( FT_STREAM_SEEK( offset ) || 841 FT_FRAME_ENTER( size ) ) 842 goto Exit; 843 844 phy_font->cursor = stream->cursor; 845 846 p = stream->cursor; 847 limit = p + size; 848 849 PFR_CHECK( 15 ); 850 phy_font->font_ref_number = PFR_NEXT_USHORT( p ); 851 phy_font->outline_resolution = PFR_NEXT_USHORT( p ); 852 phy_font->metrics_resolution = PFR_NEXT_USHORT( p ); 853 phy_font->bbox.xMin = PFR_NEXT_SHORT( p ); 854 phy_font->bbox.yMin = PFR_NEXT_SHORT( p ); 855 phy_font->bbox.xMax = PFR_NEXT_SHORT( p ); 856 phy_font->bbox.yMax = PFR_NEXT_SHORT( p ); 857 phy_font->flags = flags = PFR_NEXT_BYTE( p ); 858 859 if ( !phy_font->outline_resolution || 860 !phy_font->metrics_resolution ) 861 { 862 error = FT_THROW( Invalid_Table ); 863 FT_ERROR(( "pfr_phy_font_load: invalid resolution\n" )); 864 goto Fail; 865 } 866 867 /* get the standard advance for non-proportional fonts */ 868 if ( !( flags & PFR_PHY_PROPORTIONAL ) ) 869 { 870 PFR_CHECK( 2 ); 871 phy_font->standard_advance = PFR_NEXT_SHORT( p ); 872 } 873 874 /* load the extra items when present */ 875 if ( flags & PFR_PHY_EXTRA_ITEMS ) 876 { 877 error = pfr_extra_items_parse( &p, limit, 878 pfr_phy_font_extra_items, phy_font ); 879 if ( error ) 880 goto Fail; 881 } 882 883 /* In certain fonts, the auxiliary bytes contain interesting */ 884 /* information. These are not in the specification but can be */ 885 /* guessed by looking at the content of a few 'PFR0' fonts. */ 886 PFR_CHECK( 3 ); 887 num_aux = PFR_NEXT_ULONG( p ); 888 889 if ( num_aux > 0 ) 890 { 891 FT_Byte* q = p; 892 FT_Byte* q2; 893 894 895 PFR_CHECK_SIZE( num_aux ); 896 p += num_aux; 897 898 while ( num_aux > 0 ) 899 { 900 FT_UInt length, type; 901 902 903 if ( q + 4 > p ) 904 break; 905 906 length = PFR_NEXT_USHORT( q ); 907 if ( length < 4 || length > num_aux ) 908 break; 909 910 q2 = q + length - 2; 911 type = PFR_NEXT_USHORT( q ); 912 913 switch ( type ) 914 { 915 case 1: 916 /* this seems to correspond to the font's family name, padded to */ 917 /* an even number of bytes with a zero byte appended if needed */ 918 error = pfr_aux_name_load( q, length - 4U, memory, 919 &phy_font->family_name ); 920 if ( error ) 921 goto Exit; 922 break; 923 924 case 2: 925 if ( q + 32 > q2 ) 926 break; 927 928 q += 10; 929 phy_font->ascent = PFR_NEXT_SHORT( q ); 930 phy_font->descent = PFR_NEXT_SHORT( q ); 931 phy_font->leading = PFR_NEXT_SHORT( q ); 932 break; 933 934 case 3: 935 /* this seems to correspond to the font's style name, padded to */ 936 /* an even number of bytes with a zero byte appended if needed */ 937 error = pfr_aux_name_load( q, length - 4U, memory, 938 &phy_font->style_name ); 939 if ( error ) 940 goto Exit; 941 break; 942 943 default: 944 ; 945 } 946 947 q = q2; 948 num_aux -= length; 949 } 950 } 951 952 /* read the blue values */ 953 { 954 FT_UInt n, count; 955 956 957 PFR_CHECK( 1 ); 958 phy_font->num_blue_values = count = PFR_NEXT_BYTE( p ); 959 960 PFR_CHECK( count * 2 ); 961 962 if ( FT_QNEW_ARRAY( phy_font->blue_values, count ) ) 963 goto Fail; 964 965 for ( n = 0; n < count; n++ ) 966 phy_font->blue_values[n] = PFR_NEXT_SHORT( p ); 967 } 968 969 PFR_CHECK( 8 ); 970 phy_font->blue_fuzz = PFR_NEXT_BYTE( p ); 971 phy_font->blue_scale = PFR_NEXT_BYTE( p ); 972 973 phy_font->vertical.standard = PFR_NEXT_USHORT( p ); 974 phy_font->horizontal.standard = PFR_NEXT_USHORT( p ); 975 976 /* read the character descriptors */ 977 { 978 FT_UInt n, count, Size; 979 980 981 phy_font->num_chars = count = PFR_NEXT_USHORT( p ); 982 phy_font->chars_offset = offset + (FT_Offset)( p - stream->cursor ); 983 984 if ( !phy_font->num_chars ) 985 { 986 error = FT_THROW( Invalid_Table ); 987 FT_ERROR(( "pfr_phy_font_load: no glyphs\n" )); 988 goto Fail; 989 } 990 991 Size = 1 + 1 + 2; 992 if ( flags & PFR_PHY_2BYTE_CHARCODE ) 993 Size += 1; 994 995 if ( flags & PFR_PHY_PROPORTIONAL ) 996 Size += 2; 997 998 if ( flags & PFR_PHY_ASCII_CODE ) 999 Size += 1; 1000 1001 if ( flags & PFR_PHY_2BYTE_GPS_SIZE ) 1002 Size += 1; 1003 1004 if ( flags & PFR_PHY_3BYTE_GPS_OFFSET ) 1005 Size += 1; 1006 1007 PFR_CHECK_SIZE( count * Size ); 1008 1009 if ( FT_QNEW_ARRAY( phy_font->chars, count ) ) 1010 goto Fail; 1011 1012 for ( n = 0; n < count; n++ ) 1013 { 1014 PFR_Char cur = &phy_font->chars[n]; 1015 1016 1017 cur->char_code = ( flags & PFR_PHY_2BYTE_CHARCODE ) 1018 ? PFR_NEXT_USHORT( p ) 1019 : PFR_NEXT_BYTE( p ); 1020 1021 cur->advance = ( flags & PFR_PHY_PROPORTIONAL ) 1022 ? PFR_NEXT_SHORT( p ) 1023 : phy_font->standard_advance; 1024 1025 #if 0 1026 cur->ascii = ( flags & PFR_PHY_ASCII_CODE ) 1027 ? PFR_NEXT_BYTE( p ) 1028 : 0; 1029 #else 1030 if ( flags & PFR_PHY_ASCII_CODE ) 1031 p += 1; 1032 #endif 1033 cur->gps_size = ( flags & PFR_PHY_2BYTE_GPS_SIZE ) 1034 ? PFR_NEXT_USHORT( p ) 1035 : PFR_NEXT_BYTE( p ); 1036 1037 cur->gps_offset = ( flags & PFR_PHY_3BYTE_GPS_OFFSET ) 1038 ? PFR_NEXT_ULONG( p ) 1039 : PFR_NEXT_USHORT( p ); 1040 } 1041 } 1042 1043 /* that's it! */ 1044 1045 Fail: 1046 FT_FRAME_EXIT(); 1047 1048 /* save position of bitmap info */ 1049 phy_font->bct_offset = FT_STREAM_POS(); 1050 phy_font->cursor = NULL; 1051 1052 Exit: 1053 return error; 1054 1055 Too_Short: 1056 error = FT_THROW( Invalid_Table ); 1057 FT_ERROR(( "pfr_phy_font_load: invalid physical font table\n" )); 1058 goto Fail; 1059 } 1060 1061 1062 /* END */