docs/reference/ft2-bzip2.html

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  97             FreeType-2.13.2 API Reference
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 103               BZIP2 Streams
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 169     FreeType-2.13.2 API Reference
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 173
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 182       <a href="index.html" class="md-nav__link">
 183         TOC
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 197       <a href="ft2-index.html" class="md-nav__link">
 198         Index
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 218         General Remarks
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 224           General Remarks
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 227
 228
 229
 230
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 232     <li class="md-nav__item">
 233       <a href="ft2-preamble.html" class="md-nav__link">
 234         Preamble
 235       </a>
 236     </li>
 237
 238
 239
 240
 241
 242
 243
 244     <li class="md-nav__item">
 245       <a href="ft2-header_inclusion.html" class="md-nav__link">
 246         FreeType's header inclusion scheme
 247       </a>
 248     </li>
 249
 250
 251
 252
 253
 254
 255
 256     <li class="md-nav__item">
 257       <a href="ft2-user_allocation.html" class="md-nav__link">
 258         User allocation
 259       </a>
 260     </li>
 261
 262
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 264         </ul>
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 282
 283       <label class="md-nav__link" for="__nav_4">
 284         Core API
 285         <span class="md-nav__icon md-icon"></span>
 286       </label>
 287       <nav class="md-nav" aria-label="Core API" data-md-level="1">
 288         <label class="md-nav__title" for="__nav_4">
 289           <span class="md-nav__icon md-icon"></span>
 290           Core API
 291         </label>
 292         <ul class="md-nav__list" data-md-scrollfix>
 293
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 295
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 298     <li class="md-nav__item">
 299       <a href="ft2-basic_types.html" class="md-nav__link">
 300         Basic Data Types
 301       </a>
 302     </li>
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 311       <a href="ft2-library_setup.html" class="md-nav__link">
 312         Library Setup
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 323       <a href="ft2-face_creation.html" class="md-nav__link">
 324         Face Creation
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 326     </li>
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 335       <a href="ft2-font_testing_macros.html" class="md-nav__link">
 336         Font Testing Macros
 337       </a>
 338     </li>
 339
 340
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 342
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 346     <li class="md-nav__item">
 347       <a href="ft2-sizing_and_scaling.html" class="md-nav__link">
 348         Sizing and Scaling
 349       </a>
 350     </li>
 351
 352
 353
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 358     <li class="md-nav__item">
 359       <a href="ft2-glyph_retrieval.html" class="md-nav__link">
 360         Glyph Retrieval
 361       </a>
 362     </li>
 363
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 370     <li class="md-nav__item">
 371       <a href="ft2-character_mapping.html" class="md-nav__link">
 372         Character Mapping
 373       </a>
 374     </li>
 375
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 382     <li class="md-nav__item">
 383       <a href="ft2-information_retrieval.html" class="md-nav__link">
 384         Information Retrieval
 385       </a>
 386     </li>
 387
 388
 389
 390
 391
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 394     <li class="md-nav__item">
 395       <a href="ft2-other_api_data.html" class="md-nav__link">
 396         Other API Data
 397       </a>
 398     </li>
 399
 400
 401
 402         </ul>
 403       </nav>
 404     </li>
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 420
 421       <label class="md-nav__link" for="__nav_5">
 422         Extended API
 423         <span class="md-nav__icon md-icon"></span>
 424       </label>
 425       <nav class="md-nav" aria-label="Extended API" data-md-level="1">
 426         <label class="md-nav__title" for="__nav_5">
 427           <span class="md-nav__icon md-icon"></span>
 428           Extended API
 429         </label>
 430         <ul class="md-nav__list" data-md-scrollfix>
 431
 432
 433
 434
 435
 436     <li class="md-nav__item">
 437       <a href="ft2-glyph_variants.html" class="md-nav__link">
 438         Unicode Variation Sequences
 439       </a>
 440     </li>
 441
 442
 443
 444
 445
 446
 447
 448     <li class="md-nav__item">
 449       <a href="ft2-color_management.html" class="md-nav__link">
 450         Glyph Color Management
 451       </a>
 452     </li>
 453
 454
 455
 456
 457
 458
 459
 460     <li class="md-nav__item">
 461       <a href="ft2-layer_management.html" class="md-nav__link">
 462         Glyph Layer Management
 463       </a>
 464     </li>
 465
 466
 467
 468
 469
 470
 471
 472     <li class="md-nav__item">
 473       <a href="ft2-glyph_management.html" class="md-nav__link">
 474         Glyph Management
 475       </a>
 476     </li>
 477
 478
 479
 480
 481
 482
 483
 484     <li class="md-nav__item">
 485       <a href="ft2-mac_specific.html" class="md-nav__link">
 486         Mac Specific Interface
 487       </a>
 488     </li>
 489
 490
 491
 492
 493
 494
 495
 496     <li class="md-nav__item">
 497       <a href="ft2-sizes_management.html" class="md-nav__link">
 498         Size Management
 499       </a>
 500     </li>
 501
 502
 503
 504
 505
 506
 507
 508     <li class="md-nav__item">
 509       <a href="ft2-header_file_macros.html" class="md-nav__link">
 510         Header File Macros
 511       </a>
 512     </li>
 513
 514
 515
 516         </ul>
 517       </nav>
 518     </li>
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
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 530     <li class="md-nav__item md-nav__item--nested">
 531
 532
 533         <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_6" type="checkbox" id="__nav_6" >
 534
 535       <label class="md-nav__link" for="__nav_6">
 536         Format-Specific API
 537         <span class="md-nav__icon md-icon"></span>
 538       </label>
 539       <nav class="md-nav" aria-label="Format-Specific API" data-md-level="1">
 540         <label class="md-nav__title" for="__nav_6">
 541           <span class="md-nav__icon md-icon"></span>
 542           Format-Specific API
 543         </label>
 544         <ul class="md-nav__list" data-md-scrollfix>
 545
 546
 547
 548
 549
 550     <li class="md-nav__item">
 551       <a href="ft2-multiple_masters.html" class="md-nav__link">
 552         Multiple Masters
 553       </a>
 554     </li>
 555
 556
 557
 558
 559
 560
 561
 562     <li class="md-nav__item">
 563       <a href="ft2-truetype_tables.html" class="md-nav__link">
 564         TrueType Tables
 565       </a>
 566     </li>
 567
 568
 569
 570
 571
 572
 573
 574     <li class="md-nav__item">
 575       <a href="ft2-type1_tables.html" class="md-nav__link">
 576         Type 1 Tables
 577       </a>
 578     </li>
 579
 580
 581
 582
 583
 584
 585
 586     <li class="md-nav__item">
 587       <a href="ft2-sfnt_names.html" class="md-nav__link">
 588         SFNT Names
 589       </a>
 590     </li>
 591
 592
 593
 594
 595
 596
 597
 598     <li class="md-nav__item">
 599       <a href="ft2-bdf_fonts.html" class="md-nav__link">
 600         BDF and PCF Files
 601       </a>
 602     </li>
 603
 604
 605
 606
 607
 608
 609
 610     <li class="md-nav__item">
 611       <a href="ft2-cid_fonts.html" class="md-nav__link">
 612         CID Fonts
 613       </a>
 614     </li>
 615
 616
 617
 618
 619
 620
 621
 622     <li class="md-nav__item">
 623       <a href="ft2-pfr_fonts.html" class="md-nav__link">
 624         PFR Fonts
 625       </a>
 626     </li>
 627
 628
 629
 630
 631
 632
 633
 634     <li class="md-nav__item">
 635       <a href="ft2-winfnt_fonts.html" class="md-nav__link">
 636         Window FNT Files
 637       </a>
 638     </li>
 639
 640
 641
 642
 643
 644
 645
 646     <li class="md-nav__item">
 647       <a href="ft2-svg_fonts.html" class="md-nav__link">
 648         OpenType SVG Fonts
 649       </a>
 650     </li>
 651
 652
 653
 654
 655
 656
 657
 658     <li class="md-nav__item">
 659       <a href="ft2-font_formats.html" class="md-nav__link">
 660         Font Formats
 661       </a>
 662     </li>
 663
 664
 665
 666
 667
 668
 669
 670     <li class="md-nav__item">
 671       <a href="ft2-gasp_table.html" class="md-nav__link">
 672         Gasp Table
 673       </a>
 674     </li>
 675
 676
 677
 678         </ul>
 679       </nav>
 680     </li>
 681
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 683
 684
 685
 686
 687
 688
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 693
 694
 695         <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_7" type="checkbox" id="__nav_7" >
 696
 697       <label class="md-nav__link" for="__nav_7">
 698         Controlling FreeType Modules
 699         <span class="md-nav__icon md-icon"></span>
 700       </label>
 701       <nav class="md-nav" aria-label="Controlling FreeType Modules" data-md-level="1">
 702         <label class="md-nav__title" for="__nav_7">
 703           <span class="md-nav__icon md-icon"></span>
 704           Controlling FreeType Modules
 705         </label>
 706         <ul class="md-nav__list" data-md-scrollfix>
 707
 708
 709
 710
 711
 712     <li class="md-nav__item">
 713       <a href="ft2-auto_hinter.html" class="md-nav__link">
 714         The auto-hinter
 715       </a>
 716     </li>
 717
 718
 719
 720
 721
 722
 723
 724     <li class="md-nav__item">
 725       <a href="ft2-cff_driver.html" class="md-nav__link">
 726         The CFF driver
 727       </a>
 728     </li>
 729
 730
 731
 732
 733
 734
 735
 736     <li class="md-nav__item">
 737       <a href="ft2-t1_cid_driver.html" class="md-nav__link">
 738         The Type 1 and CID drivers
 739       </a>
 740     </li>
 741
 742
 743
 744
 745
 746
 747
 748     <li class="md-nav__item">
 749       <a href="ft2-tt_driver.html" class="md-nav__link">
 750         The TrueType driver
 751       </a>
 752     </li>
 753
 754
 755
 756
 757
 758
 759
 760     <li class="md-nav__item">
 761       <a href="ft2-pcf_driver.html" class="md-nav__link">
 762         The PCF driver
 763       </a>
 764     </li>
 765
 766
 767
 768
 769
 770
 771
 772     <li class="md-nav__item">
 773       <a href="ft2-ot_svg_driver.html" class="md-nav__link">
 774         The SVG driver
 775       </a>
 776     </li>
 777
 778
 779
 780
 781
 782
 783
 784     <li class="md-nav__item">
 785       <a href="ft2-properties.html" class="md-nav__link">
 786         Driver properties
 787       </a>
 788     </li>
 789
 790
 791
 792
 793
 794
 795
 796     <li class="md-nav__item">
 797       <a href="ft2-parameter_tags.html" class="md-nav__link">
 798         Parameter Tags
 799       </a>
 800     </li>
 801
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 808     <li class="md-nav__item">
 809       <a href="ft2-lcd_rendering.html" class="md-nav__link">
 810         Subpixel Rendering
 811       </a>
 812     </li>
 813
 814
 815
 816         </ul>
 817       </nav>
 818     </li>
 819
 820
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 834
 835       <label class="md-nav__link" for="__nav_8">
 836         Cache Sub-System
 837         <span class="md-nav__icon md-icon"></span>
 838       </label>
 839       <nav class="md-nav" aria-label="Cache Sub-System" data-md-level="1">
 840         <label class="md-nav__title" for="__nav_8">
 841           <span class="md-nav__icon md-icon"></span>
 842           Cache Sub-System
 843         </label>
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 845
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 850     <li class="md-nav__item">
 851       <a href="ft2-cache_subsystem.html" class="md-nav__link">
 852         Cache Sub-System
 853       </a>
 854     </li>
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 880         Support API
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 886           Support API
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 889
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 894     <li class="md-nav__item">
 895       <a href="ft2-computations.html" class="md-nav__link">
 896         Computations
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 898     </li>
 899
 900
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 906     <li class="md-nav__item">
 907       <a href="ft2-list_processing.html" class="md-nav__link">
 908         List Processing
 909       </a>
 910     </li>
 911
 912
 913
 914
 915
 916
 917
 918     <li class="md-nav__item">
 919       <a href="ft2-outline_processing.html" class="md-nav__link">
 920         Outline Processing
 921       </a>
 922     </li>
 923
 924
 925
 926
 927
 928
 929
 930     <li class="md-nav__item">
 931       <a href="ft2-quick_advance.html" class="md-nav__link">
 932         Quick retrieval of advance values
 933       </a>
 934     </li>
 935
 936
 937
 938
 939
 940
 941
 942     <li class="md-nav__item">
 943       <a href="ft2-bitmap_handling.html" class="md-nav__link">
 944         Bitmap Handling
 945       </a>
 946     </li>
 947
 948
 949
 950
 951
 952
 953
 954     <li class="md-nav__item">
 955       <a href="ft2-raster.html" class="md-nav__link">
 956         Scanline Converter
 957       </a>
 958     </li>
 959
 960
 961
 962
 963
 964
 965
 966     <li class="md-nav__item">
 967       <a href="ft2-glyph_stroker.html" class="md-nav__link">
 968         Glyph Stroker
 969       </a>
 970     </li>
 971
 972
 973
 974
 975
 976
 977
 978     <li class="md-nav__item">
 979       <a href="ft2-system_interface.html" class="md-nav__link">
 980         System Interface
 981       </a>
 982     </li>
 983
 984
 985
 986
 987
 988
 989
 990     <li class="md-nav__item">
 991       <a href="ft2-module_management.html" class="md-nav__link">
 992         Module Management
 993       </a>
 994     </li>
 995
 996
 997
 998
 999
1000
1001
1002     <li class="md-nav__item">
1003       <a href="ft2-gzip.html" class="md-nav__link">
1004         GZIP Streams
1005       </a>
1006     </li>
1007
1008
1009
1010
1011
1012
1013
1014     <li class="md-nav__item">
1015       <a href="ft2-lzw.html" class="md-nav__link">
1016         LZW Streams
1017       </a>
1018     </li>
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028     <li class="md-nav__item md-nav__item--active">
1029
1030       <input class="md-nav__toggle md-toggle" data-md-toggle="toc" type="checkbox" id="__toc">
1031
1032
1033
1034
1035
1036         <label class="md-nav__link md-nav__link--active" for="__toc">
1037           BZIP2 Streams
1038           <span class="md-nav__icon md-icon"></span>
1039         </label>
1040
1041       <a href="ft2-bzip2.html" class="md-nav__link md-nav__link--active">
1042         BZIP2 Streams
1043       </a>
1044
1045
1046 <nav class="md-nav md-nav--secondary" aria-label="Table of contents">
1047
1048
1049
1050
1051
1052
1053     <label class="md-nav__title" for="__toc">
1054       <span class="md-nav__icon md-icon"></span>
1055       Table of contents
1056     </label>
1057     <ul class="md-nav__list" data-md-component="toc" data-md-scrollfix>
1058
1059         <li class="md-nav__item">
1060   <a href="#synopsis" class="md-nav__link">
1061     Synopsis
1062   </a>
1063
1064 </li>
1065
1066         <li class="md-nav__item">
1067   <a href="#ft_stream_openbzip2" class="md-nav__link">
1068     FT_Stream_OpenBzip2
1069   </a>
1070
1071 </li>
1072
1073     </ul>
1074
1075 </nav>
1076
1077     </li>
1078
1079
1080
1081
1082
1083
1084
1085     <li class="md-nav__item">
1086       <a href="ft2-debugging_apis.html" class="md-nav__link">
1087         External Debugging APIs
1088       </a>
1089     </li>
1090
1091
1092
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1094       </nav>
1095     </li>
1096
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1108
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1111
1112       <label class="md-nav__link" for="__nav_10">
1113         Error Codes
1114         <span class="md-nav__icon md-icon"></span>
1115       </label>
1116       <nav class="md-nav" aria-label="Error Codes" data-md-level="1">
1117         <label class="md-nav__title" for="__nav_10">
1118           <span class="md-nav__icon md-icon"></span>
1119           Error Codes
1120         </label>
1121         <ul class="md-nav__list" data-md-scrollfix>
1122
1123
1124
1125
1126
1127     <li class="md-nav__item">
1128       <a href="ft2-error_enumerations.html" class="md-nav__link">
1129         Error Enumerations
1130       </a>
1131     </li>
1132
1133
1134
1135
1136
1137
1138
1139     <li class="md-nav__item">
1140       <a href="ft2-error_code_values.html" class="md-nav__link">
1141         Error Code Values
1142       </a>
1143     </li>
1144
1145
1146
1147         </ul>
1148       </nav>
1149     </li>
1150
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1162
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1165
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1167         Miscellaneous
1168         <span class="md-nav__icon md-icon"></span>
1169       </label>
1170       <nav class="md-nav" aria-label="Miscellaneous" data-md-level="1">
1171         <label class="md-nav__title" for="__nav_11">
1172           <span class="md-nav__icon md-icon"></span>
1173           Miscellaneous
1174         </label>
1175         <ul class="md-nav__list" data-md-scrollfix>
1176
1177
1178
1179
1180
1181     <li class="md-nav__item">
1182       <a href="ft2-gx_validation.html" class="md-nav__link">
1183         TrueTypeGX/AAT Validation
1184       </a>
1185     </li>
1186
1187
1188
1189
1190
1191
1192
1193     <li class="md-nav__item">
1194       <a href="ft2-incremental.html" class="md-nav__link">
1195         Incremental Loading
1196       </a>
1197     </li>
1198
1199
1200
1201
1202
1203
1204
1205     <li class="md-nav__item">
1206       <a href="ft2-truetype_engine.html" class="md-nav__link">
1207         The TrueType Engine
1208       </a>
1209     </li>
1210
1211
1212
1213
1214
1215
1216
1217     <li class="md-nav__item">
1218       <a href="ft2-ot_validation.html" class="md-nav__link">
1219         OpenType Validation
1220       </a>
1221     </li>
1222
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1224
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1226       </nav>
1227     </li>
1228
1229
1230
1231   </ul>
1232 </nav>
1233                   </div>
1234                 </div>
1235               </div>
1236
1237
1238
1239               <div class="md-sidebar md-sidebar--secondary" data-md-component="sidebar" data-md-type="toc" >
1240                 <div class="md-sidebar__scrollwrap">
1241                   <div class="md-sidebar__inner">
1242
1243 <nav class="md-nav md-nav--secondary" aria-label="Table of contents">
1244
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1248
1249
1250     <label class="md-nav__title" for="__toc">
1251       <span class="md-nav__icon md-icon"></span>
1252       Table of contents
1253     </label>
1254     <ul class="md-nav__list" data-md-component="toc" data-md-scrollfix>
1255
1256         <li class="md-nav__item">
1257   <a href="#synopsis" class="md-nav__link">
1258     Synopsis
1259   </a>
1260
1261 </li>
1262
1263         <li class="md-nav__item">
1264   <a href="#ft_stream_openbzip2" class="md-nav__link">
1265     FT_Stream_OpenBzip2
1266   </a>
1267
1268 </li>
1269
1270     </ul>
1271
1272 </nav>
1273                   </div>
1274                 </div>
1275               </div>
1276
1277
1278           <div class="md-content" data-md-component="content">
1279             <article class="md-content__inner md-typeset">
1280
1281
1282
1283                 <p><a href="https://www.freetype.org">FreeType</a> &raquo; <a href="../">Docs</a> &raquo; <a href="index.html#support-api">Support API</a> &raquo; BZIP2 Streams</p>
1284 <hr />
1285 <h1 id="bzip2-streams">BZIP2 Streams<a class="headerlink" href="#bzip2-streams" title="Permanent link">&para;</a></h1>
1286 <h2 id="synopsis">Synopsis<a class="headerlink" href="#synopsis" title="Permanent link">&para;</a></h2>
1287 <p>In certain builds of the library, bzip2 compression recognition is automatically handled when calling <code><a href="ft2-face_creation.html#ft_new_face">FT_New_Face</a></code> or <code><a href="ft2-face_creation.html#ft_open_face">FT_Open_Face</a></code>. This means that if no font driver is capable of handling the raw compressed file, the library will try to open a bzip2 compressed stream from it and re-open the face with it.</p>
1288 <p>The stream implementation is very basic and resets the decompression process each time seeking backwards is needed within the stream, which significantly undermines the performance.</p>
1289 <p>This section contains the declaration of Bzip2-specific functions.</p>
1290 <h2 id="ft_stream_openbzip2">FT_Stream_OpenBzip2<a class="headerlink" href="#ft_stream_openbzip2" title="Permanent link">&para;</a></h2>
1291 <p>Defined in FT_BZIP2_H (freetype/ftbzip2.h).</p>
1292 <div class = "codehilite"><pre><code>  FT_EXPORT( <a href="ft2-basic_types.html#ft_error">FT_Error</a> )
1293   <b>FT_Stream_OpenBzip2</b>( <a href="ft2-system_interface.html#ft_stream">FT_Stream</a>  stream,
1294                        <a href="ft2-system_interface.html#ft_stream">FT_Stream</a>  source );
1295 </code></pre></div>
1296
1297 <p>Open a new stream to parse bzip2-compressed font files. This is mainly used to support the compressed <code>*.pcf.bz2</code> fonts that come with XFree86.</p>
1298 <h4>input</h4>
1299 <table class="fields">
1300 <tr><td class="val" id="stream">stream</td><td class="desc">
1301 <p>The target embedding stream.</p>
1302 </td></tr>
1303 <tr><td class="val" id="source">source</td><td class="desc">
1304 <p>The source stream.</p>
1305 </td></tr>
1306 </table>
1307
1308 <h4>return</h4>
1309
1310 <p>FreeType error code. 0&nbsp;means success.</p>
1311 <h4>note</h4>
1312
1313 <p>The source stream must be opened <em>before</em> calling this function.</p>
1314 <p>Calling the internal function <code>FT_Stream_Close</code> on the new stream will <strong>not</strong> call <code>FT_Stream_Close</code> on the source stream. None of the stream objects will be released to the heap.</p>
1315 <p>This function may return <code>FT_Err_Unimplemented_Feature</code> if your build of FreeType was not compiled with bzip2 support.</p>
1316 <hr>
1317
1318
1319
1320
1321
1322
1323
1324             </article>
1325           </div>
1326         </div>
1327
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1329
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1331 <footer class="md-footer">
1332
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1334
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1337           <div class="md-footer__button md-icon">
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1373             Copyright 2023 <a href = "https://www.freetype.org/license.html">The FreeType Project</a>.
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1375
1376         Made with
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1385 </footer>
1386
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1388     <div class="md-dialog" data-md-component="dialog">
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1390     </div>
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1394       <script src="assets/javascripts/bundle.82b56eb2.min.js"></script>
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1399   </body>
1400 </html>