kc3-lang/freetype/src/sfnt/ttload.c
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Hash : 274207eb
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Date : 2013-07-18T12:38:57
[sfnt] Ignore invalid magic number in `head' or `bhed'. Other font engines seem to ignore it also. Problem reported by Hin-Tak Leung <htl10@users.sourceforge.net>. * src/sfnt/ttload.c (check_table_dir): Don't abort but warn only if we have an invalid magic number.
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src/sfnt/ttload.c
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/***************************************************************************/ /* */ /* ttload.c */ /* */ /* Load the basic TrueType tables, i.e., tables that can be either in */ /* TTF or OTF fonts (body). */ /* */ /* Copyright 1996-2010, 2012, 2013 by */ /* David Turner, Robert Wilhelm, and Werner Lemberg. */ /* */ /* This file is part of the FreeType project, and may only be used, */ /* modified, and distributed under the terms of the FreeType project */ /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ /* this file you indicate that you have read the license and */ /* understand and accept it fully. */ /* */ /***************************************************************************/ #include <ft2build.h> #include FT_INTERNAL_DEBUG_H #include FT_INTERNAL_STREAM_H #include FT_TRUETYPE_TAGS_H #include "ttload.h" #include "sferrors.h" /*************************************************************************/ /* */ /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ /* messages during execution. */ /* */ #undef FT_COMPONENT #define FT_COMPONENT trace_ttload /*************************************************************************/ /* */ /* <Function> */ /* tt_face_lookup_table */ /* */ /* <Description> */ /* Looks for a TrueType table by name. */ /* */ /* <Input> */ /* face :: A face object handle. */ /* */ /* tag :: The searched tag. */ /* */ /* <Return> */ /* A pointer to the table directory entry. 0 if not found. */ /* */ FT_LOCAL_DEF( TT_Table ) tt_face_lookup_table( TT_Face face, FT_ULong tag ) { TT_Table entry; TT_Table limit; #ifdef FT_DEBUG_LEVEL_TRACE FT_Bool zero_length = FALSE; #endif FT_TRACE4(( "tt_face_lookup_table: %08p, `%c%c%c%c' -- ", face, (FT_Char)( tag >> 24 ), (FT_Char)( tag >> 16 ), (FT_Char)( tag >> 8 ), (FT_Char)( tag ) )); entry = face->dir_tables; limit = entry + face->num_tables; for ( ; entry < limit; entry++ ) { /* For compatibility with Windows, we consider */ /* zero-length tables the same as missing tables. */ if ( entry->Tag == tag ) { if ( entry->Length != 0 ) { FT_TRACE4(( "found table.\n" )); return entry; } #ifdef FT_DEBUG_LEVEL_TRACE zero_length = TRUE; #endif } } #ifdef FT_DEBUG_LEVEL_TRACE if ( zero_length ) FT_TRACE4(( "ignoring empty table\n" )); else FT_TRACE4(( "could not find table\n" )); #endif return NULL; } /*************************************************************************/ /* */ /* <Function> */ /* tt_face_goto_table */ /* */ /* <Description> */ /* Looks for a TrueType table by name, then seek a stream to it. */ /* */ /* <Input> */ /* face :: A face object handle. */ /* */ /* tag :: The searched tag. */ /* */ /* stream :: The stream to seek when the table is found. */ /* */ /* <Output> */ /* length :: The length of the table if found, undefined otherwise. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ FT_LOCAL_DEF( FT_Error ) tt_face_goto_table( TT_Face face, FT_ULong tag, FT_Stream stream, FT_ULong* length ) { TT_Table table; FT_Error error; table = tt_face_lookup_table( face, tag ); if ( table ) { if ( length ) *length = table->Length; if ( FT_STREAM_SEEK( table->Offset ) ) goto Exit; } else error = FT_THROW( Table_Missing ); Exit: return error; } /* Here, we */ /* */ /* - check that `num_tables' is valid (and adjust it if necessary) */ /* */ /* - look for a `head' table, check its size, and parse it to check */ /* whether its `magic' field is correctly set */ /* */ /* - errors (except errors returned by stream handling) */ /* */ /* SFNT_Err_Unknown_File_Format: */ /* no table is defined in directory, it is not sfnt-wrapped */ /* data */ /* SFNT_Err_Table_Missing: */ /* table directory is valid, but essential tables */ /* (head/bhed/SING) are missing */ /* */ static FT_Error check_table_dir( SFNT_Header sfnt, FT_Stream stream ) { FT_Error error; FT_UShort nn, valid_entries = 0; FT_UInt has_head = 0, has_sing = 0, has_meta = 0; FT_ULong offset = sfnt->offset + 12; static const FT_Frame_Field table_dir_entry_fields[] = { #undef FT_STRUCTURE #define FT_STRUCTURE TT_TableRec FT_FRAME_START( 16 ), FT_FRAME_ULONG( Tag ), FT_FRAME_ULONG( CheckSum ), FT_FRAME_ULONG( Offset ), FT_FRAME_ULONG( Length ), FT_FRAME_END }; if ( FT_STREAM_SEEK( offset ) ) goto Exit; for ( nn = 0; nn < sfnt->num_tables; nn++ ) { TT_TableRec table; if ( FT_STREAM_READ_FIELDS( table_dir_entry_fields, &table ) ) { nn--; FT_TRACE2(( "check_table_dir:" " can read only %d table%s in font (instead of %d)\n", nn, nn == 1 ? "" : "s", sfnt->num_tables )); sfnt->num_tables = nn; break; } /* we ignore invalid tables */ if ( table.Offset + table.Length > stream->size ) { FT_TRACE2(( "check_table_dir: table entry %d invalid\n", nn )); continue; } else valid_entries++; if ( table.Tag == TTAG_head || table.Tag == TTAG_bhed ) { FT_UInt32 magic; #ifndef TT_CONFIG_OPTION_EMBEDDED_BITMAPS if ( table.Tag == TTAG_head ) #endif has_head = 1; /* * The table length should be 0x36, but certain font tools make it * 0x38, so we will just check that it is greater. * * Note that according to the specification, the table must be * padded to 32-bit lengths, but this doesn't apply to the value of * its `Length' field! * */ if ( table.Length < 0x36 ) { FT_TRACE2(( "check_table_dir:" " `head' or `bhed' table too small\n" )); error = FT_THROW( Table_Missing ); goto Exit; } if ( FT_STREAM_SEEK( table.Offset + 12 ) || FT_READ_ULONG( magic ) ) goto Exit; if ( magic != 0x5F0F3CF5UL ) FT_TRACE2(( "check_table_dir:" " invalid magic number in `head' or `bhed' table\n")); if ( FT_STREAM_SEEK( offset + ( nn + 1 ) * 16 ) ) goto Exit; } else if ( table.Tag == TTAG_SING ) has_sing = 1; else if ( table.Tag == TTAG_META ) has_meta = 1; } sfnt->num_tables = valid_entries; if ( sfnt->num_tables == 0 ) { FT_TRACE2(( "check_table_dir: no tables found\n" )); error = FT_THROW( Unknown_File_Format ); goto Exit; } /* if `sing' and `meta' tables are present, there is no `head' table */ if ( has_head || ( has_sing && has_meta ) ) { error = FT_Err_Ok; goto Exit; } else { FT_TRACE2(( "check_table_dir:" )); #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS FT_TRACE2(( " neither `head', `bhed', nor `sing' table found\n" )); #else FT_TRACE2(( " neither `head' nor `sing' table found\n" )); #endif error = FT_THROW( Table_Missing ); } Exit: return error; } /*************************************************************************/ /* */ /* <Function> */ /* tt_face_load_font_dir */ /* */ /* <Description> */ /* Loads the header of a SFNT font file. */ /* */ /* <Input> */ /* face :: A handle to the target face object. */ /* */ /* stream :: The input stream. */ /* */ /* <Output> */ /* sfnt :: The SFNT header. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ /* <Note> */ /* The stream cursor must be at the beginning of the font directory. */ /* */ FT_LOCAL_DEF( FT_Error ) tt_face_load_font_dir( TT_Face face, FT_Stream stream ) { SFNT_HeaderRec sfnt; FT_Error error; FT_Memory memory = stream->memory; TT_TableRec* entry; FT_Int nn; static const FT_Frame_Field offset_table_fields[] = { #undef FT_STRUCTURE #define FT_STRUCTURE SFNT_HeaderRec FT_FRAME_START( 8 ), FT_FRAME_USHORT( num_tables ), FT_FRAME_USHORT( search_range ), FT_FRAME_USHORT( entry_selector ), FT_FRAME_USHORT( range_shift ), FT_FRAME_END }; FT_TRACE2(( "tt_face_load_font_dir: %08p\n", face )); /* read the offset table */ sfnt.offset = FT_STREAM_POS(); if ( FT_READ_ULONG( sfnt.format_tag ) || FT_STREAM_READ_FIELDS( offset_table_fields, &sfnt ) ) goto Exit; /* many fonts don't have these fields set correctly */ #if 0 if ( sfnt.search_range != 1 << ( sfnt.entry_selector + 4 ) || sfnt.search_range + sfnt.range_shift != sfnt.num_tables << 4 ) return FT_THROW( Unknown_File_Format ); #endif /* load the table directory */ FT_TRACE2(( "-- Number of tables: %10u\n", sfnt.num_tables )); FT_TRACE2(( "-- Format version: 0x%08lx\n", sfnt.format_tag )); if ( sfnt.format_tag != TTAG_OTTO ) { /* check first */ error = check_table_dir( &sfnt, stream ); if ( error ) { FT_TRACE2(( "tt_face_load_font_dir:" " invalid table directory for TrueType\n" )); goto Exit; } } face->num_tables = sfnt.num_tables; face->format_tag = sfnt.format_tag; if ( FT_QNEW_ARRAY( face->dir_tables, face->num_tables ) ) goto Exit; if ( FT_STREAM_SEEK( sfnt.offset + 12 ) || FT_FRAME_ENTER( face->num_tables * 16L ) ) goto Exit; entry = face->dir_tables; FT_TRACE2(( "\n" " tag offset length checksum\n" " ----------------------------------\n" )); for ( nn = 0; nn < sfnt.num_tables; nn++ ) { entry->Tag = FT_GET_TAG4(); entry->CheckSum = FT_GET_ULONG(); entry->Offset = FT_GET_LONG(); entry->Length = FT_GET_LONG(); /* ignore invalid tables */ if ( entry->Offset + entry->Length > stream->size ) continue; else { FT_TRACE2(( " %c%c%c%c %08lx %08lx %08lx\n", (FT_Char)( entry->Tag >> 24 ), (FT_Char)( entry->Tag >> 16 ), (FT_Char)( entry->Tag >> 8 ), (FT_Char)( entry->Tag ), entry->Offset, entry->Length, entry->CheckSum )); entry++; } } FT_FRAME_EXIT(); FT_TRACE2(( "table directory loaded\n\n" )); Exit: return error; } /*************************************************************************/ /* */ /* <Function> */ /* tt_face_load_any */ /* */ /* <Description> */ /* Loads any font table into client memory. */ /* */ /* <Input> */ /* face :: The face object to look for. */ /* */ /* tag :: The tag of table to load. Use the value 0 if you want */ /* to access the whole font file, else set this parameter */ /* to a valid TrueType table tag that you can forge with */ /* the MAKE_TT_TAG macro. */ /* */ /* offset :: The starting offset in the table (or the file if */ /* tag == 0). */ /* */ /* length :: The address of the decision variable: */ /* */ /* If length == NULL: */ /* Loads the whole table. Returns an error if */ /* `offset' == 0! */ /* */ /* If *length == 0: */ /* Exits immediately; returning the length of the given */ /* table or of the font file, depending on the value of */ /* `tag'. */ /* */ /* If *length != 0: */ /* Loads the next `length' bytes of table or font, */ /* starting at offset `offset' (in table or font too). */ /* */ /* <Output> */ /* buffer :: The address of target buffer. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ FT_LOCAL_DEF( FT_Error ) tt_face_load_any( TT_Face face, FT_ULong tag, FT_Long offset, FT_Byte* buffer, FT_ULong* length ) { FT_Error error; FT_Stream stream; TT_Table table; FT_ULong size; if ( tag != 0 ) { /* look for tag in font directory */ table = tt_face_lookup_table( face, tag ); if ( !table ) { error = FT_THROW( Table_Missing ); goto Exit; } offset += table->Offset; size = table->Length; } else /* tag == 0 -- the user wants to access the font file directly */ size = face->root.stream->size; if ( length && *length == 0 ) { *length = size; return FT_Err_Ok; } if ( length ) size = *length; stream = face->root.stream; /* the `if' is syntactic sugar for picky compilers */ if ( FT_STREAM_READ_AT( offset, buffer, size ) ) goto Exit; Exit: return error; } /*************************************************************************/ /* */ /* <Function> */ /* tt_face_load_generic_header */ /* */ /* <Description> */ /* Loads the TrueType table `head' or `bhed'. */ /* */ /* <Input> */ /* face :: A handle to the target face object. */ /* */ /* stream :: The input stream. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ static FT_Error tt_face_load_generic_header( TT_Face face, FT_Stream stream, FT_ULong tag ) { FT_Error error; TT_Header* header; static const FT_Frame_Field header_fields[] = { #undef FT_STRUCTURE #define FT_STRUCTURE TT_Header FT_FRAME_START( 54 ), FT_FRAME_ULONG ( Table_Version ), FT_FRAME_ULONG ( Font_Revision ), FT_FRAME_LONG ( CheckSum_Adjust ), FT_FRAME_LONG ( Magic_Number ), FT_FRAME_USHORT( Flags ), FT_FRAME_USHORT( Units_Per_EM ), FT_FRAME_LONG ( Created[0] ), FT_FRAME_LONG ( Created[1] ), FT_FRAME_LONG ( Modified[0] ), FT_FRAME_LONG ( Modified[1] ), FT_FRAME_SHORT ( xMin ), FT_FRAME_SHORT ( yMin ), FT_FRAME_SHORT ( xMax ), FT_FRAME_SHORT ( yMax ), FT_FRAME_USHORT( Mac_Style ), FT_FRAME_USHORT( Lowest_Rec_PPEM ), FT_FRAME_SHORT ( Font_Direction ), FT_FRAME_SHORT ( Index_To_Loc_Format ), FT_FRAME_SHORT ( Glyph_Data_Format ), FT_FRAME_END }; error = face->goto_table( face, tag, stream, 0 ); if ( error ) goto Exit; header = &face->header; if ( FT_STREAM_READ_FIELDS( header_fields, header ) ) goto Exit; FT_TRACE3(( "Units per EM: %4u\n", header->Units_Per_EM )); FT_TRACE3(( "IndexToLoc: %4d\n", header->Index_To_Loc_Format )); Exit: return error; } FT_LOCAL_DEF( FT_Error ) tt_face_load_head( TT_Face face, FT_Stream stream ) { return tt_face_load_generic_header( face, stream, TTAG_head ); } #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS FT_LOCAL_DEF( FT_Error ) tt_face_load_bhed( TT_Face face, FT_Stream stream ) { return tt_face_load_generic_header( face, stream, TTAG_bhed ); } #endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */ /*************************************************************************/ /* */ /* <Function> */ /* tt_face_load_max_profile */ /* */ /* <Description> */ /* Loads the maximum profile into a face object. */ /* */ /* <Input> */ /* face :: A handle to the target face object. */ /* */ /* stream :: The input stream. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ FT_LOCAL_DEF( FT_Error ) tt_face_load_maxp( TT_Face face, FT_Stream stream ) { FT_Error error; TT_MaxProfile* maxProfile = &face->max_profile; static const FT_Frame_Field maxp_fields[] = { #undef FT_STRUCTURE #define FT_STRUCTURE TT_MaxProfile FT_FRAME_START( 6 ), FT_FRAME_LONG ( version ), FT_FRAME_USHORT( numGlyphs ), FT_FRAME_END }; static const FT_Frame_Field maxp_fields_extra[] = { FT_FRAME_START( 26 ), FT_FRAME_USHORT( maxPoints ), FT_FRAME_USHORT( maxContours ), FT_FRAME_USHORT( maxCompositePoints ), FT_FRAME_USHORT( maxCompositeContours ), FT_FRAME_USHORT( maxZones ), FT_FRAME_USHORT( maxTwilightPoints ), FT_FRAME_USHORT( maxStorage ), FT_FRAME_USHORT( maxFunctionDefs ), FT_FRAME_USHORT( maxInstructionDefs ), FT_FRAME_USHORT( maxStackElements ), FT_FRAME_USHORT( maxSizeOfInstructions ), FT_FRAME_USHORT( maxComponentElements ), FT_FRAME_USHORT( maxComponentDepth ), FT_FRAME_END }; error = face->goto_table( face, TTAG_maxp, stream, 0 ); if ( error ) goto Exit; if ( FT_STREAM_READ_FIELDS( maxp_fields, maxProfile ) ) goto Exit; maxProfile->maxPoints = 0; maxProfile->maxContours = 0; maxProfile->maxCompositePoints = 0; maxProfile->maxCompositeContours = 0; maxProfile->maxZones = 0; maxProfile->maxTwilightPoints = 0; maxProfile->maxStorage = 0; maxProfile->maxFunctionDefs = 0; maxProfile->maxInstructionDefs = 0; maxProfile->maxStackElements = 0; maxProfile->maxSizeOfInstructions = 0; maxProfile->maxComponentElements = 0; maxProfile->maxComponentDepth = 0; if ( maxProfile->version >= 0x10000L ) { if ( FT_STREAM_READ_FIELDS( maxp_fields_extra, maxProfile ) ) goto Exit; /* XXX: an adjustment that is necessary to load certain */ /* broken fonts like `Keystrokes MT' :-( */ /* */ /* We allocate 64 function entries by default when */ /* the maxFunctionDefs value is smaller. */ if ( maxProfile->maxFunctionDefs < 64 ) maxProfile->maxFunctionDefs = 64; /* we add 4 phantom points later */ if ( maxProfile->maxTwilightPoints > ( 0xFFFFU - 4 ) ) { FT_TRACE0(( "tt_face_load_maxp:" " too much twilight points in `maxp' table;\n" " " " some glyphs might be rendered incorrectly\n" )); maxProfile->maxTwilightPoints = 0xFFFFU - 4; } /* we arbitrarily limit recursion to avoid stack exhaustion */ if ( maxProfile->maxComponentDepth > 100 ) { FT_TRACE0(( "tt_face_load_maxp:" " abnormally large component depth (%d) set to 100\n", maxProfile->maxComponentDepth )); maxProfile->maxComponentDepth = 100; } } FT_TRACE3(( "numGlyphs: %u\n", maxProfile->numGlyphs )); Exit: return error; } /*************************************************************************/ /* */ /* <Function> */ /* tt_face_load_name */ /* */ /* <Description> */ /* Loads the name records. */ /* */ /* <Input> */ /* face :: A handle to the target face object. */ /* */ /* stream :: The input stream. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ FT_LOCAL_DEF( FT_Error ) tt_face_load_name( TT_Face face, FT_Stream stream ) { FT_Error error; FT_Memory memory = stream->memory; FT_ULong table_pos, table_len; FT_ULong storage_start, storage_limit; FT_UInt count; TT_NameTable table; static const FT_Frame_Field name_table_fields[] = { #undef FT_STRUCTURE #define FT_STRUCTURE TT_NameTableRec FT_FRAME_START( 6 ), FT_FRAME_USHORT( format ), FT_FRAME_USHORT( numNameRecords ), FT_FRAME_USHORT( storageOffset ), FT_FRAME_END }; static const FT_Frame_Field name_record_fields[] = { #undef FT_STRUCTURE #define FT_STRUCTURE TT_NameEntryRec /* no FT_FRAME_START */ FT_FRAME_USHORT( platformID ), FT_FRAME_USHORT( encodingID ), FT_FRAME_USHORT( languageID ), FT_FRAME_USHORT( nameID ), FT_FRAME_USHORT( stringLength ), FT_FRAME_USHORT( stringOffset ), FT_FRAME_END }; table = &face->name_table; table->stream = stream; error = face->goto_table( face, TTAG_name, stream, &table_len ); if ( error ) goto Exit; table_pos = FT_STREAM_POS(); if ( FT_STREAM_READ_FIELDS( name_table_fields, table ) ) goto Exit; /* Some popular Asian fonts have an invalid `storageOffset' value */ /* (it should be at least "6 + 12*num_names"). However, the string */ /* offsets, computed as "storageOffset + entry->stringOffset", are */ /* valid pointers within the name table... */ /* */ /* We thus can't check `storageOffset' right now. */ /* */ storage_start = table_pos + 6 + 12*table->numNameRecords; storage_limit = table_pos + table_len; if ( storage_start > storage_limit ) { FT_ERROR(( "tt_face_load_name: invalid `name' table\n" )); error = FT_THROW( Name_Table_Missing ); goto Exit; } /* Allocate the array of name records. */ count = table->numNameRecords; table->numNameRecords = 0; if ( FT_NEW_ARRAY( table->names, count ) || FT_FRAME_ENTER( count * 12 ) ) goto Exit; /* Load the name records and determine how much storage is needed */ /* to hold the strings themselves. */ { TT_NameEntryRec* entry = table->names; for ( ; count > 0; count-- ) { if ( FT_STREAM_READ_FIELDS( name_record_fields, entry ) ) continue; /* check that the name is not empty */ if ( entry->stringLength == 0 ) continue; /* check that the name string is within the table */ entry->stringOffset += table_pos + table->storageOffset; if ( entry->stringOffset < storage_start || entry->stringOffset + entry->stringLength > storage_limit ) { /* invalid entry - ignore it */ entry->stringOffset = 0; entry->stringLength = 0; continue; } entry++; } table->numNameRecords = (FT_UInt)( entry - table->names ); } FT_FRAME_EXIT(); /* everything went well, update face->num_names */ face->num_names = (FT_UShort) table->numNameRecords; Exit: return error; } /*************************************************************************/ /* */ /* <Function> */ /* tt_face_free_names */ /* */ /* <Description> */ /* Frees the name records. */ /* */ /* <Input> */ /* face :: A handle to the target face object. */ /* */ FT_LOCAL_DEF( void ) tt_face_free_name( TT_Face face ) { FT_Memory memory = face->root.driver->root.memory; TT_NameTable table = &face->name_table; TT_NameEntry entry = table->names; FT_UInt count = table->numNameRecords; if ( table->names ) { for ( ; count > 0; count--, entry++ ) { FT_FREE( entry->string ); entry->stringLength = 0; } /* free strings table */ FT_FREE( table->names ); } table->numNameRecords = 0; table->format = 0; table->storageOffset = 0; } /*************************************************************************/ /* */ /* <Function> */ /* tt_face_load_cmap */ /* */ /* <Description> */ /* Loads the cmap directory in a face object. The cmaps themselves */ /* are loaded on demand in the `ttcmap.c' module. */ /* */ /* <Input> */ /* face :: A handle to the target face object. */ /* */ /* stream :: A handle to the input stream. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ FT_LOCAL_DEF( FT_Error ) tt_face_load_cmap( TT_Face face, FT_Stream stream ) { FT_Error error; error = face->goto_table( face, TTAG_cmap, stream, &face->cmap_size ); if ( error ) goto Exit; if ( FT_FRAME_EXTRACT( face->cmap_size, face->cmap_table ) ) face->cmap_size = 0; Exit: return error; } /*************************************************************************/ /* */ /* <Function> */ /* tt_face_load_os2 */ /* */ /* <Description> */ /* Loads the OS2 table. */ /* */ /* <Input> */ /* face :: A handle to the target face object. */ /* */ /* stream :: A handle to the input stream. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ FT_LOCAL_DEF( FT_Error ) tt_face_load_os2( TT_Face face, FT_Stream stream ) { FT_Error error; TT_OS2* os2; static const FT_Frame_Field os2_fields[] = { #undef FT_STRUCTURE #define FT_STRUCTURE TT_OS2 FT_FRAME_START( 78 ), FT_FRAME_USHORT( version ), FT_FRAME_SHORT ( xAvgCharWidth ), FT_FRAME_USHORT( usWeightClass ), FT_FRAME_USHORT( usWidthClass ), FT_FRAME_SHORT ( fsType ), FT_FRAME_SHORT ( ySubscriptXSize ), FT_FRAME_SHORT ( ySubscriptYSize ), FT_FRAME_SHORT ( ySubscriptXOffset ), FT_FRAME_SHORT ( ySubscriptYOffset ), FT_FRAME_SHORT ( ySuperscriptXSize ), FT_FRAME_SHORT ( ySuperscriptYSize ), FT_FRAME_SHORT ( ySuperscriptXOffset ), FT_FRAME_SHORT ( ySuperscriptYOffset ), FT_FRAME_SHORT ( yStrikeoutSize ), FT_FRAME_SHORT ( yStrikeoutPosition ), FT_FRAME_SHORT ( sFamilyClass ), FT_FRAME_BYTE ( panose[0] ), FT_FRAME_BYTE ( panose[1] ), FT_FRAME_BYTE ( panose[2] ), FT_FRAME_BYTE ( panose[3] ), FT_FRAME_BYTE ( panose[4] ), FT_FRAME_BYTE ( panose[5] ), FT_FRAME_BYTE ( panose[6] ), FT_FRAME_BYTE ( panose[7] ), FT_FRAME_BYTE ( panose[8] ), FT_FRAME_BYTE ( panose[9] ), FT_FRAME_ULONG ( ulUnicodeRange1 ), FT_FRAME_ULONG ( ulUnicodeRange2 ), FT_FRAME_ULONG ( ulUnicodeRange3 ), FT_FRAME_ULONG ( ulUnicodeRange4 ), FT_FRAME_BYTE ( achVendID[0] ), FT_FRAME_BYTE ( achVendID[1] ), FT_FRAME_BYTE ( achVendID[2] ), FT_FRAME_BYTE ( achVendID[3] ), FT_FRAME_USHORT( fsSelection ), FT_FRAME_USHORT( usFirstCharIndex ), FT_FRAME_USHORT( usLastCharIndex ), FT_FRAME_SHORT ( sTypoAscender ), FT_FRAME_SHORT ( sTypoDescender ), FT_FRAME_SHORT ( sTypoLineGap ), FT_FRAME_USHORT( usWinAscent ), FT_FRAME_USHORT( usWinDescent ), FT_FRAME_END }; static const FT_Frame_Field os2_fields_extra[] = { FT_FRAME_START( 8 ), FT_FRAME_ULONG( ulCodePageRange1 ), FT_FRAME_ULONG( ulCodePageRange2 ), FT_FRAME_END }; static const FT_Frame_Field os2_fields_extra2[] = { FT_FRAME_START( 10 ), FT_FRAME_SHORT ( sxHeight ), FT_FRAME_SHORT ( sCapHeight ), FT_FRAME_USHORT( usDefaultChar ), FT_FRAME_USHORT( usBreakChar ), FT_FRAME_USHORT( usMaxContext ), FT_FRAME_END }; /* We now support old Mac fonts where the OS/2 table doesn't */ /* exist. Simply put, we set the `version' field to 0xFFFF */ /* and test this value each time we need to access the table. */ error = face->goto_table( face, TTAG_OS2, stream, 0 ); if ( error ) goto Exit; os2 = &face->os2; if ( FT_STREAM_READ_FIELDS( os2_fields, os2 ) ) goto Exit; os2->ulCodePageRange1 = 0; os2->ulCodePageRange2 = 0; os2->sxHeight = 0; os2->sCapHeight = 0; os2->usDefaultChar = 0; os2->usBreakChar = 0; os2->usMaxContext = 0; if ( os2->version >= 0x0001 ) { /* only version 1 tables */ if ( FT_STREAM_READ_FIELDS( os2_fields_extra, os2 ) ) goto Exit; if ( os2->version >= 0x0002 ) { /* only version 2 tables */ if ( FT_STREAM_READ_FIELDS( os2_fields_extra2, os2 ) ) goto Exit; } } FT_TRACE3(( "sTypoAscender: %4d\n", os2->sTypoAscender )); FT_TRACE3(( "sTypoDescender: %4d\n", os2->sTypoDescender )); FT_TRACE3(( "usWinAscent: %4u\n", os2->usWinAscent )); FT_TRACE3(( "usWinDescent: %4u\n", os2->usWinDescent )); FT_TRACE3(( "fsSelection: 0x%2x\n", os2->fsSelection )); Exit: return error; } /*************************************************************************/ /* */ /* <Function> */ /* tt_face_load_postscript */ /* */ /* <Description> */ /* Loads the Postscript table. */ /* */ /* <Input> */ /* face :: A handle to the target face object. */ /* */ /* stream :: A handle to the input stream. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ FT_LOCAL_DEF( FT_Error ) tt_face_load_post( TT_Face face, FT_Stream stream ) { FT_Error error; TT_Postscript* post = &face->postscript; static const FT_Frame_Field post_fields[] = { #undef FT_STRUCTURE #define FT_STRUCTURE TT_Postscript FT_FRAME_START( 32 ), FT_FRAME_ULONG( FormatType ), FT_FRAME_ULONG( italicAngle ), FT_FRAME_SHORT( underlinePosition ), FT_FRAME_SHORT( underlineThickness ), FT_FRAME_ULONG( isFixedPitch ), FT_FRAME_ULONG( minMemType42 ), FT_FRAME_ULONG( maxMemType42 ), FT_FRAME_ULONG( minMemType1 ), FT_FRAME_ULONG( maxMemType1 ), FT_FRAME_END }; error = face->goto_table( face, TTAG_post, stream, 0 ); if ( error ) return error; if ( FT_STREAM_READ_FIELDS( post_fields, post ) ) return error; /* we don't load the glyph names, we do that in another */ /* module (ttpost). */ FT_TRACE3(( "FormatType: 0x%x\n", post->FormatType )); FT_TRACE3(( "isFixedPitch: %s\n", post->isFixedPitch ? " yes" : " no" )); return FT_Err_Ok; } /*************************************************************************/ /* */ /* <Function> */ /* tt_face_load_pclt */ /* */ /* <Description> */ /* Loads the PCL 5 Table. */ /* */ /* <Input> */ /* face :: A handle to the target face object. */ /* */ /* stream :: A handle to the input stream. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ FT_LOCAL_DEF( FT_Error ) tt_face_load_pclt( TT_Face face, FT_Stream stream ) { static const FT_Frame_Field pclt_fields[] = { #undef FT_STRUCTURE #define FT_STRUCTURE TT_PCLT FT_FRAME_START( 54 ), FT_FRAME_ULONG ( Version ), FT_FRAME_ULONG ( FontNumber ), FT_FRAME_USHORT( Pitch ), FT_FRAME_USHORT( xHeight ), FT_FRAME_USHORT( Style ), FT_FRAME_USHORT( TypeFamily ), FT_FRAME_USHORT( CapHeight ), FT_FRAME_BYTES ( TypeFace, 16 ), FT_FRAME_BYTES ( CharacterComplement, 8 ), FT_FRAME_BYTES ( FileName, 6 ), FT_FRAME_CHAR ( StrokeWeight ), FT_FRAME_CHAR ( WidthType ), FT_FRAME_BYTE ( SerifStyle ), FT_FRAME_BYTE ( Reserved ), FT_FRAME_END }; FT_Error error; TT_PCLT* pclt = &face->pclt; /* optional table */ error = face->goto_table( face, TTAG_PCLT, stream, 0 ); if ( error ) goto Exit; if ( FT_STREAM_READ_FIELDS( pclt_fields, pclt ) ) goto Exit; Exit: return error; } /*************************************************************************/ /* */ /* <Function> */ /* tt_face_load_gasp */ /* */ /* <Description> */ /* Loads the `gasp' table into a face object. */ /* */ /* <Input> */ /* face :: A handle to the target face object. */ /* */ /* stream :: The input stream. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ FT_LOCAL_DEF( FT_Error ) tt_face_load_gasp( TT_Face face, FT_Stream stream ) { FT_Error error; FT_Memory memory = stream->memory; FT_UInt j,num_ranges; TT_GaspRange gaspranges = NULL; /* the gasp table is optional */ error = face->goto_table( face, TTAG_gasp, stream, 0 ); if ( error ) goto Exit; if ( FT_FRAME_ENTER( 4L ) ) goto Exit; face->gasp.version = FT_GET_USHORT(); face->gasp.numRanges = FT_GET_USHORT(); FT_FRAME_EXIT(); /* only support versions 0 and 1 of the table */ if ( face->gasp.version >= 2 ) { face->gasp.numRanges = 0; error = FT_THROW( Invalid_Table ); goto Exit; } num_ranges = face->gasp.numRanges; FT_TRACE3(( "numRanges: %u\n", num_ranges )); if ( FT_QNEW_ARRAY( face->gasp.gaspRanges, num_ranges ) || FT_FRAME_ENTER( num_ranges * 4L ) ) goto Exit; gaspranges = face->gasp.gaspRanges; for ( j = 0; j < num_ranges; j++ ) { gaspranges[j].maxPPEM = FT_GET_USHORT(); gaspranges[j].gaspFlag = FT_GET_USHORT(); FT_TRACE3(( "gaspRange %d: rangeMaxPPEM %5d, rangeGaspBehavior 0x%x\n", j, gaspranges[j].maxPPEM, gaspranges[j].gaspFlag )); } FT_FRAME_EXIT(); Exit: return error; } /* END */