kc3-lang/freetype/src/sfnt/ttload.c
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Hash : fed59b7c
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Date : 2002-07-17T22:51:06
* src/sfnt/ttload.c (TT_Load_SFNT_Header): fixed a recent bug that prevented OpenType fonts to be recognized by FreeType
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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 1996-2001, 2002 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 "ttcmap.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_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_LookUp_Table( TT_Face face, FT_ULong tag ) { TT_Table entry; TT_Table limit; FT_TRACE3(( "TT_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 0-length */ /* tables the same as missing tables. */ if ( entry->Tag == tag && entry->Length != 0 ) { FT_TRACE3(( "found table.\n" )); return entry; } } FT_TRACE3(( "could not find table!\n" )); return 0; } /*************************************************************************/ /* */ /* <Function> */ /* TT_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_Goto_Table( TT_Face face, FT_ULong tag, FT_Stream stream, FT_ULong* length ) { TT_Table table; FT_Error error; table = TT_LookUp_Table( face, tag ); if ( table ) { if ( length ) *length = table->Length; if ( FT_STREAM_SEEK( table->Offset ) ) goto Exit; } else error = SFNT_Err_Table_Missing; Exit: return error; } /* in theory, we should check the values of `search_range', */ /* `entry_selector' and `range_shift' to detect non-SFNT based files */ /* whose header might also start with 0x100000L (yes, these exist). */ /* */ /* Very unfortunately, many TrueType fonts don't have these fields */ /* set correctly and we must ignore them to support them. An alternative */ /* way to check the font file is thus to: */ /* */ /* - check that `num_tables' is valid */ /* - look for a "head" table, check its size, and parse it to */ /* see if its "magic" field is correctly set to */ /* */ /* Voila, here comes robust though tolerant font format checking :-) */ /* */ static FT_Error sfnt_dir_check( FT_Stream stream, FT_ULong offset, FT_UInt num_tables ) { FT_Error error; FT_UInt nn, has_head = 0; static const FT_Frame_Field sfnt_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 'num_tables' is 0, read the table count from the file */ if ( num_tables == 0 ) { FT_ULong format_tag; if ( FT_STREAM_SEEK( offset ) || FT_READ_ULONG ( format_tag ) || FT_READ_USHORT( num_tables ) || FT_STREAM_SKIP( 6 ) ) goto Bad_Format; if ( offset + 12 + num_tables*16 > stream->size ) goto Bad_Format; } else if ( FT_STREAM_SEEK( offset + 12 ) ) goto Bad_Format; for ( nn = 0; nn < num_tables; nn++ ) { TT_TableRec table; if ( FT_STREAM_READ_FIELDS( sfnt_dir_entry_fields, &table ) ) goto Bad_Format; if ( offset + table.Offset + table.Length > stream->size ) goto Bad_Format; if ( table.Tag == TTAG_head ) { FT_UInt32 magic; has_head = 1; if ( table.Length != 0x36 || FT_STREAM_SEEK( offset + table.Offset + 12 ) || FT_READ_ULONG( magic ) || magic != 0x5F0F3CF5U ) goto Bad_Format; if ( FT_STREAM_SEEK( offset + 28 + 16*nn ) ) goto Bad_Format; } } if ( has_head == 0 ) goto Bad_Format; Exit: return error; Bad_Format: error = FT_Err_Unknown_File_Format; goto Exit; } /*************************************************************************/ /* */ /* <Function> */ /* TT_Load_SFNT_Header */ /* */ /* <Description> */ /* Loads the header of a SFNT font file. Supports collections. */ /* */ /* <Input> */ /* face :: A handle to the target face object. */ /* */ /* stream :: The input stream. */ /* */ /* face_index :: If the font is a collection, the number of the font */ /* in the collection, ignored otherwise. */ /* */ /* <Output> */ /* sfnt :: The SFNT header. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ /* <Note> */ /* The stream cursor must be at the font file's origin. */ /* */ /* This function recognizes fonts embedded in a `TrueType collection' */ /* */ /* The header will be checked whether it is valid by looking at the */ /* values of `search_range', `entry_selector', and `range_shift'. */ /* */ FT_LOCAL_DEF( FT_Error ) TT_Load_SFNT_Header( TT_Face face, FT_Stream stream, FT_Long face_index, SFNT_Header sfnt ) { FT_Error error; FT_ULong format_tag, offset; FT_Memory memory = stream->memory; static const FT_Frame_Field sfnt_header_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 }; static const FT_Frame_Field ttc_header_fields[] = { #undef FT_STRUCTURE #define FT_STRUCTURE TTC_HeaderRec FT_FRAME_START( 8 ), FT_FRAME_LONG( version ), FT_FRAME_LONG( count ), FT_FRAME_END }; FT_TRACE2(( "TT_Load_SFNT_Header: %08p, %ld\n", face, face_index )); face->ttc_header.tag = 0; face->ttc_header.version = 0; face->ttc_header.count = 0; face->num_tables = 0; /* first of all, read the first 4 bytes. If it is `ttcf', then the */ /* file is a TrueType collection, otherwise it can be any other */ /* kind of font. */ /* */ offset = FT_STREAM_POS(); if ( FT_READ_ULONG( format_tag ) ) goto Exit; if ( format_tag == TTAG_ttcf ) { FT_Int n; FT_TRACE3(( "TT_Load_SFNT_Header: file is a collection\n" )); /* It is a TrueType collection, i.e. a file containing several */ /* font files. Read the font directory now */ if ( FT_STREAM_READ_FIELDS( ttc_header_fields, &face->ttc_header ) ) goto Exit; /* now read the offsets of each font in the file */ if ( FT_NEW_ARRAY( face->ttc_header.offsets, face->ttc_header.count ) || FT_FRAME_ENTER( face->ttc_header.count * 4L ) ) goto Exit; for ( n = 0; n < face->ttc_header.count; n++ ) face->ttc_header.offsets[n] = FT_GET_ULONG(); FT_FRAME_EXIT(); /* check face index */ if ( face_index >= face->ttc_header.count ) { error = SFNT_Err_Bad_Argument; goto Exit; } /* seek to the appropriate TrueType file, then read tag */ offset = face->ttc_header.offsets[ face_index ]; if ( FT_STREAM_SEEK( offset ) || FT_READ_LONG( format_tag ) ) goto Exit; } /* the format tag was read, now check the rest of the header */ sfnt->format_tag = format_tag; sfnt->offset = offset; if ( FT_STREAM_READ_FIELDS( sfnt_header_fields, sfnt ) ) goto Exit; /* now check the sfnt directory */ error = sfnt_dir_check( stream, offset, sfnt->num_tables ); if ( error ) { FT_TRACE2(( "TT_Load_SFNT_Header: file is not SFNT!\n" )); error = SFNT_Err_Unknown_File_Format; } Exit: return error; } /*************************************************************************/ /* */ /* <Function> */ /* TT_Load_Directory */ /* */ /* <Description> */ /* Loads the table directory into a face object. */ /* */ /* <InOut> */ /* face :: A handle to the target face object. */ /* */ /* <Input> */ /* stream :: The input stream. */ /* */ /* sfnt :: The SFNT directory header. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ /* <Note> */ /* The stream cursor must be at the font file's origin. */ /* */ FT_LOCAL_DEF( FT_Error ) TT_Load_Directory( TT_Face face, FT_Stream stream, SFNT_Header sfnt ) { FT_Error error; FT_Memory memory = stream->memory; TT_TableRec *entry, *limit; FT_TRACE2(( "TT_Load_Directory: %08p\n", face )); FT_TRACE2(( "-- Tables count: %12u\n", sfnt->num_tables )); FT_TRACE2(( "-- Format version: %08lx\n", sfnt->format_tag )); face->num_tables = sfnt->num_tables; if ( FT_NEW_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; limit = entry + face->num_tables; for ( ; entry < limit; entry++ ) { /* loop through the tables and get all entries */ entry->Tag = FT_GET_TAG4(); entry->CheckSum = FT_GET_ULONG(); entry->Offset = FT_GET_LONG(); entry->Length = FT_GET_LONG(); FT_TRACE2(( " %c%c%c%c - %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 )); } FT_FRAME_EXIT(); FT_TRACE2(( "Directory loaded\n\n" )); Exit: return error; } /*************************************************************************/ /* */ /* <Function> */ /* TT_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_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_LookUp_Table( face, tag ); if ( !table ) { error = SFNT_Err_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 SFNT_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_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_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 }; FT_TRACE2(( "TT_Load_Generic_Header: " "%08p, looking up font table `%c%c%c%c'.\n", face, (FT_Char)( tag >> 24 ), (FT_Char)( tag >> 16 ), (FT_Char)( tag >> 8 ), (FT_Char)( tag ) )); error = face->goto_table( face, tag, stream, 0 ); if ( error ) { FT_TRACE2(( "TT_Load_Generic_Header: Font table is missing!\n" )); goto Exit; } header = &face->header; if ( FT_STREAM_READ_FIELDS( header_fields, header ) ) goto Exit; FT_TRACE2(( " Units per EM: %8u\n", header->Units_Per_EM )); FT_TRACE2(( " IndexToLoc: %8d\n", header->Index_To_Loc_Format )); FT_TRACE2(( "TT_Load_Generic_Header: Font table loaded.\n" )); Exit: return error; } FT_LOCAL_DEF( FT_Error ) TT_Load_Header( TT_Face face, FT_Stream stream ) { return TT_Load_Generic_Header( face, stream, TTAG_head ); } #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS FT_LOCAL_DEF( FT_Error ) TT_Load_Bitmap_Header( TT_Face face, FT_Stream stream ) { return TT_Load_Generic_Header( face, stream, TTAG_bhed ); } #endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */ /*************************************************************************/ /* */ /* <Function> */ /* TT_Load_MaxProfile */ /* */ /* <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_Load_MaxProfile( TT_Face face, FT_Stream stream ) { FT_Error error; TT_MaxProfile* maxProfile = &face->max_profile; 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 }; 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 }; FT_TRACE2(( "Load_TT_MaxProfile: %08p\n", face )); 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 field is null. */ if ( maxProfile->maxFunctionDefs == 0 ) maxProfile->maxFunctionDefs = 64; face->root.num_glyphs = maxProfile->numGlyphs; face->root.internal->max_points = (FT_UShort)MAX( maxProfile->maxCompositePoints, maxProfile->maxPoints ); face->root.internal->max_contours = (FT_Short)MAX( maxProfile->maxCompositeContours, maxProfile->maxContours ); face->max_components = (FT_ULong)maxProfile->maxComponentElements + maxProfile->maxComponentDepth; /* XXX: some fonts have maxComponents set to 0; we will */ /* then use 16 of them by default. */ if ( face->max_components == 0 ) face->max_components = 16; /* We also increase maxPoints and maxContours in order to support */ /* some broken fonts. */ face->root.internal->max_points += (FT_UShort)8; face->root.internal->max_contours += (FT_Short) 4; } FT_TRACE2(( "MAXP loaded.\n" )); Exit: return error; } /*************************************************************************/ /* */ /* <Function> */ /* TT_Load_Metrics */ /* */ /* <Description> */ /* Loads the horizontal or vertical metrics table into a face object. */ /* */ /* <Input> */ /* face :: A handle to the target face object. */ /* */ /* stream :: The input stream. */ /* */ /* vertical :: A boolean flag. If set, load vertical metrics. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ static FT_Error TT_Load_Metrics( TT_Face face, FT_Stream stream, FT_Bool vertical ) { FT_Error error; FT_Memory memory = stream->memory; FT_ULong table_len; FT_Long num_shorts, num_longs, num_shorts_checked; TT_LongMetrics * longs; TT_ShortMetrics** shorts; FT_TRACE2(( "TT_Load_%s_Metrics: %08p\n", vertical ? "Vertical" : "Horizontal", face )); if ( vertical ) { /* The table is optional, quit silently if it wasn't found */ /* */ /* XXX: Some fonts have a valid vertical header with a non-null */ /* `number_of_VMetrics' fields, but no corresponding `vmtx' */ /* table to get the metrics from (e.g. mingliu). */ /* */ /* For safety, we set the field to 0! */ /* */ error = face->goto_table( face, TTAG_vmtx, stream, &table_len ); if ( error ) { /* Set number_Of_VMetrics to 0! */ FT_TRACE2(( " no vertical header in file.\n" )); face->vertical.number_Of_VMetrics = 0; error = SFNT_Err_Ok; goto Exit; } num_longs = face->vertical.number_Of_VMetrics; longs = (TT_LongMetrics *)&face->vertical.long_metrics; shorts = (TT_ShortMetrics**)&face->vertical.short_metrics; } else { error = face->goto_table( face, TTAG_hmtx, stream, &table_len ); if ( error ) { FT_ERROR(( " no horizontal metrics in file!\n" )); error = SFNT_Err_Hmtx_Table_Missing; goto Exit; } num_longs = face->horizontal.number_Of_HMetrics; longs = (TT_LongMetrics *)&face->horizontal.long_metrics; shorts = (TT_ShortMetrics**)&face->horizontal.short_metrics; } /* never trust derived values */ num_shorts = face->max_profile.numGlyphs - num_longs; num_shorts_checked = ( table_len - num_longs * 4L ) / 2; if ( num_shorts < 0 ) { FT_ERROR(( "TT_Load_%s_Metrics: more metrics than glyphs!\n", vertical ? "Vertical" : "Horizontal" )); error = vertical ? SFNT_Err_Invalid_Vert_Metrics : SFNT_Err_Invalid_Horiz_Metrics; goto Exit; } if ( FT_NEW_ARRAY( *longs, num_longs ) || FT_NEW_ARRAY( *shorts, num_shorts ) ) goto Exit; if ( FT_FRAME_ENTER( table_len ) ) goto Exit; { TT_LongMetrics cur = *longs; TT_LongMetrics limit = cur + num_longs; for ( ; cur < limit; cur++ ) { cur->advance = FT_GET_USHORT(); cur->bearing = FT_GET_SHORT(); } } /* do we have an inconsistent number of metric values? */ { TT_ShortMetrics* cur = *shorts; TT_ShortMetrics* limit = cur + MIN( num_shorts, num_shorts_checked ); for ( ; cur < limit; cur++ ) *cur = FT_GET_SHORT(); /* we fill up the missing left side bearings with the */ /* last valid value. Since this will occur for buggy CJK */ /* fonts usually only, nothing serious will happen */ if ( num_shorts > num_shorts_checked && num_shorts_checked > 0 ) { FT_Short val = (*shorts)[num_shorts_checked - 1]; limit = *shorts + num_shorts; for ( ; cur < limit; cur++ ) *cur = val; } } FT_FRAME_EXIT(); FT_TRACE2(( "loaded\n" )); Exit: return error; } /*************************************************************************/ /* */ /* <Function> */ /* TT_Load_Metrics_Header */ /* */ /* <Description> */ /* Loads the horizontal or vertical header in a face object. */ /* */ /* <Input> */ /* face :: A handle to the target face object. */ /* */ /* stream :: The input stream. */ /* */ /* vertical :: A boolean flag. If set, load vertical metrics. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ FT_LOCAL_DEF( FT_Error ) TT_Load_Metrics_Header( TT_Face face, FT_Stream stream, FT_Bool vertical ) { FT_Error error; TT_HoriHeader* header; const FT_Frame_Field metrics_header_fields[] = { #undef FT_STRUCTURE #define FT_STRUCTURE TT_HoriHeader FT_FRAME_START( 36 ), FT_FRAME_ULONG ( Version ), FT_FRAME_SHORT ( Ascender ), FT_FRAME_SHORT ( Descender ), FT_FRAME_SHORT ( Line_Gap ), FT_FRAME_USHORT( advance_Width_Max ), FT_FRAME_SHORT ( min_Left_Side_Bearing ), FT_FRAME_SHORT ( min_Right_Side_Bearing ), FT_FRAME_SHORT ( xMax_Extent ), FT_FRAME_SHORT ( caret_Slope_Rise ), FT_FRAME_SHORT ( caret_Slope_Run ), FT_FRAME_SHORT ( caret_Offset ), FT_FRAME_SHORT ( Reserved[0] ), FT_FRAME_SHORT ( Reserved[1] ), FT_FRAME_SHORT ( Reserved[2] ), FT_FRAME_SHORT ( Reserved[3] ), FT_FRAME_SHORT ( metric_Data_Format ), FT_FRAME_USHORT( number_Of_HMetrics ), FT_FRAME_END }; FT_TRACE2(( vertical ? "Vertical header " : "Horizontal header " )); if ( vertical ) { face->vertical_info = 0; /* The vertical header table is optional, so return quietly if */ /* we don't find it. */ error = face->goto_table( face, TTAG_vhea, stream, 0 ); if ( error ) { error = SFNT_Err_Ok; goto Exit; } face->vertical_info = 1; header = (TT_HoriHeader*)&face->vertical; } else { /* The horizontal header is mandatory; return an error if we */ /* don't find it. */ error = face->goto_table( face, TTAG_hhea, stream, 0 ); if ( error ) { error = SFNT_Err_Horiz_Header_Missing; goto Exit; } header = &face->horizontal; } if ( FT_STREAM_READ_FIELDS( metrics_header_fields, header ) ) goto Exit; header->long_metrics = NULL; header->short_metrics = NULL; FT_TRACE2(( "loaded\n" )); /* Now try to load the corresponding metrics */ error = TT_Load_Metrics( face, stream, vertical ); Exit: return error; } /*************************************************************************/ /* */ /* <Function> */ /* TT_Load_Names */ /* */ /* <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_Load_Names( 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; FT_TRACE2(( "Names " )); error = face->goto_table( face, TTAG_name, stream, &table_len ); if ( error ) { /* The name table is required so indicate failure. */ FT_TRACE2(( "is missing!\n" )); error = SFNT_Err_Name_Table_Missing; 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_Load_Names: invalid `name' table\n" )); error = SFNT_Err_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 = entry - table->names; } FT_FRAME_EXIT(); FT_TRACE2(( "loaded\n" )); /* everything went well, update face->num_names */ face->num_names = (FT_UShort) table->numNameRecords; Exit: return error; } /*************************************************************************/ /* */ /* <Function> */ /* TT_Free_Names */ /* */ /* <Description> */ /* Frees the name records. */ /* */ /* <Input> */ /* face :: A handle to the target face object. */ /* */ FT_LOCAL_DEF( void ) TT_Free_Names( 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; 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_Load_CMap */ /* */ /* <Description> */ /* Loads the cmap directory in a face object. The cmaps itselves 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_Load_CMap( TT_Face face, FT_Stream stream ) { FT_Error error; error = face->goto_table( face, TTAG_cmap, stream, &face->cmap_size ); if ( error ) { FT_TRACE2(( "No `cmap' table in font !\n" )); error = SFNT_Err_CMap_Table_Missing; goto Exit; } if ( !FT_FRAME_EXTRACT( face->cmap_size, face->cmap_table ) ) FT_TRACE2(( "`cmap' table loaded\n" )); else { FT_ERROR(( "`cmap' table is too short!\n" )); face->cmap_size = 0; } Exit: return error; } /*************************************************************************/ /* */ /* <Function> */ /* TT_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_Load_OS2( TT_Face face, FT_Stream stream ) { FT_Error error; TT_OS2* os2; 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 }; const FT_Frame_Field os2_fields_extra[] = { FT_FRAME_START( 8 ), FT_FRAME_ULONG( ulCodePageRange1 ), FT_FRAME_ULONG( ulCodePageRange2 ), FT_FRAME_END }; 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 }; FT_TRACE2(( "OS/2 Table " )); /* 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 ) { FT_TRACE2(( "is missing!\n" )); face->os2.version = 0xFFFFU; error = SFNT_Err_Ok; 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_TRACE2(( "loaded\n" )); Exit: return error; } /*************************************************************************/ /* */ /* <Function> */ /* TT_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_Load_PostScript( 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 }; FT_TRACE2(( "PostScript " )); error = face->goto_table( face, TTAG_post, stream, 0 ); if ( error ) return SFNT_Err_Post_Table_Missing; 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_TRACE2(( "loaded\n" )); return SFNT_Err_Ok; } /*************************************************************************/ /* */ /* <Function> */ /* TT_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_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; FT_TRACE2(( "PCLT " )); /* optional table */ error = face->goto_table( face, TTAG_PCLT, stream, 0 ); if ( error ) { FT_TRACE2(( "missing (optional)\n" )); pclt->Version = 0; return SFNT_Err_Ok; } if ( FT_STREAM_READ_FIELDS( pclt_fields, pclt ) ) goto Exit; FT_TRACE2(( "loaded\n" )); Exit: return error; } /*************************************************************************/ /* */ /* <Function> */ /* TT_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_Load_Gasp( TT_Face face, FT_Stream stream ) { FT_Error error; FT_Memory memory = stream->memory; FT_UInt j,num_ranges; TT_GaspRange gaspranges; FT_TRACE2(( "TT_Load_Gasp: %08p\n", face )); /* the gasp table is optional */ error = face->goto_table( face, TTAG_gasp, stream, 0 ); if ( error ) return SFNT_Err_Ok; if ( FT_FRAME_ENTER( 4L ) ) goto Exit; face->gasp.version = FT_GET_USHORT(); face->gasp.numRanges = FT_GET_USHORT(); FT_FRAME_EXIT(); num_ranges = face->gasp.numRanges; FT_TRACE3(( "number of ranges = %d\n", num_ranges )); if ( FT_NEW_ARRAY( gaspranges, num_ranges ) || FT_FRAME_ENTER( num_ranges * 4L ) ) goto Exit; face->gasp.gaspRanges = gaspranges; for ( j = 0; j < num_ranges; j++ ) { gaspranges[j].maxPPEM = FT_GET_USHORT(); gaspranges[j].gaspFlag = FT_GET_USHORT(); FT_TRACE3(( " [max:%d flag:%d]", gaspranges[j].maxPPEM, gaspranges[j].gaspFlag )); } FT_TRACE3(( "\n" )); FT_FRAME_EXIT(); FT_TRACE2(( "GASP loaded\n" )); Exit: return error; } FT_CALLBACK_DEF( int ) tt_kern_pair_compare( const void* a, const void* b ); /*************************************************************************/ /* */ /* <Function> */ /* TT_Load_Kern */ /* */ /* <Description> */ /* Loads the first kerning table with format 0 in the font. Only */ /* accepts the first horizontal kerning table. Developers should use */ /* the `ftxkern' extension to access other kerning tables in the font */ /* file, if they really want to. */ /* */ /* <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_Load_Kern( TT_Face face, FT_Stream stream ) { FT_Error error; FT_Memory memory = stream->memory; FT_UInt n, num_tables; /* the kern table is optional; exit silently if it is missing */ error = face->goto_table( face, TTAG_kern, stream, 0 ); if ( error ) return SFNT_Err_Ok; if ( FT_FRAME_ENTER( 4L ) ) goto Exit; (void)FT_GET_USHORT(); /* version */ num_tables = FT_GET_USHORT(); FT_FRAME_EXIT(); for ( n = 0; n < num_tables; n++ ) { FT_UInt coverage; FT_UInt length; if ( FT_FRAME_ENTER( 6L ) ) goto Exit; (void)FT_GET_USHORT(); /* version */ length = FT_GET_USHORT() - 6; /* substract header length */ coverage = FT_GET_USHORT(); FT_FRAME_EXIT(); if ( coverage == 0x0001 ) { FT_UInt num_pairs; TT_Kern0_Pair pair; TT_Kern0_Pair limit; /* found a horizontal format 0 kerning table! */ if ( FT_FRAME_ENTER( 8L ) ) goto Exit; num_pairs = FT_GET_USHORT(); /* skip the rest */ FT_FRAME_EXIT(); /* allocate array of kerning pairs */ if ( FT_NEW_ARRAY( face->kern_pairs, num_pairs ) || FT_FRAME_ENTER( 6L * num_pairs ) ) goto Exit; pair = face->kern_pairs; limit = pair + num_pairs; for ( ; pair < limit; pair++ ) { pair->left = FT_GET_USHORT(); pair->right = FT_GET_USHORT(); pair->value = FT_GET_USHORT(); } FT_FRAME_EXIT(); face->num_kern_pairs = num_pairs; face->kern_table_index = n; /* ensure that the kerning pair table is sorted (yes, some */ /* fonts have unsorted tables!) */ { FT_UInt i; TT_Kern0_Pair pair0; pair0 = face->kern_pairs; for ( i = 1; i < num_pairs; i++, pair0++ ) { if ( tt_kern_pair_compare( pair0, pair0 + 1 ) != -1 ) { ft_qsort( (void*)face->kern_pairs, (int)num_pairs, sizeof ( TT_Kern0_PairRec ), tt_kern_pair_compare ); break; } } } goto Exit; } if ( FT_STREAM_SKIP( length ) ) goto Exit; } /* no kern table found -- doesn't matter */ face->kern_table_index = -1; face->num_kern_pairs = 0; face->kern_pairs = NULL; Exit: return error; } #undef TT_KERN_INDEX #define TT_KERN_INDEX( g1, g2 ) ( ( (FT_ULong)g1 << 16 ) | g2 ) FT_CALLBACK_DEF( int ) tt_kern_pair_compare( const void* a, const void* b ) { TT_Kern0_Pair pair1 = (TT_Kern0_Pair)a; TT_Kern0_Pair pair2 = (TT_Kern0_Pair)b; FT_ULong index1 = TT_KERN_INDEX( pair1->left, pair1->right ); FT_ULong index2 = TT_KERN_INDEX( pair2->left, pair2->right ); return ( index1 < index2 ? -1 : ( index1 > index2 ? 1 : 0 )); } #undef TT_KERN_INDEX /*************************************************************************/ /* */ /* <Function> */ /* TT_Load_Hdmx */ /* */ /* <Description> */ /* Loads the horizontal device metrics 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_Load_Hdmx( TT_Face face, FT_Stream stream ) { FT_Error error; FT_Memory memory = stream->memory; TT_Hdmx hdmx = &face->hdmx; FT_Long num_glyphs; FT_Long record_size; hdmx->version = 0; hdmx->num_records = 0; hdmx->records = 0; /* this table is optional */ error = face->goto_table( face, TTAG_hdmx, stream, 0 ); if ( error ) return SFNT_Err_Ok; if ( FT_FRAME_ENTER( 8L ) ) goto Exit; hdmx->version = FT_GET_USHORT(); hdmx->num_records = FT_GET_SHORT(); record_size = FT_GET_LONG(); FT_FRAME_EXIT(); /* Only recognize format 0 */ if ( hdmx->version != 0 ) goto Exit; if ( FT_NEW_ARRAY( hdmx->records, hdmx->num_records ) ) goto Exit; num_glyphs = face->root.num_glyphs; record_size -= num_glyphs + 2; { TT_HdmxEntry cur = hdmx->records; TT_HdmxEntry limit = cur + hdmx->num_records; for ( ; cur < limit; cur++ ) { /* read record */ if ( FT_READ_BYTE( cur->ppem ) || FT_READ_BYTE( cur->max_width ) ) goto Exit; if ( FT_ALLOC( cur->widths, num_glyphs ) || FT_STREAM_READ( cur->widths, num_glyphs ) ) goto Exit; /* skip padding bytes */ if ( record_size > 0 && FT_STREAM_SKIP( record_size ) ) goto Exit; } } Exit: return error; } /*************************************************************************/ /* */ /* <Function> */ /* TT_Free_Hdmx */ /* */ /* <Description> */ /* Frees the horizontal device metrics table. */ /* */ /* <Input> */ /* face :: A handle to the target face object. */ /* */ FT_LOCAL_DEF( void ) TT_Free_Hdmx( TT_Face face ) { if ( face ) { FT_Int n; FT_Memory memory = face->root.driver->root.memory; for ( n = 0; n < face->hdmx.num_records; n++ ) FT_FREE( face->hdmx.records[n].widths ); FT_FREE( face->hdmx.records ); face->hdmx.num_records = 0; } } /* END */