| /***************************************************************************/ |
| /* */ |
| /* ttpload.c */ |
| /* */ |
| /* TrueType-specific tables loader (body). */ |
| /* */ |
| /* Copyright 1996-2017 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_OBJECTS_H |
| #include FT_INTERNAL_STREAM_H |
| #include FT_TRUETYPE_TAGS_H |
| |
| #include "ttpload.h" |
| |
| #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT |
| #include "ttgxvar.h" |
| #endif |
| |
| #include "tterrors.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_ttpload |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <Function> */ |
| /* tt_face_load_loca */ |
| /* */ |
| /* <Description> */ |
| /* Load the locations table. */ |
| /* */ |
| /* <InOut> */ |
| /* face :: A handle to the target face object. */ |
| /* */ |
| /* <Input> */ |
| /* stream :: The input stream. */ |
| /* */ |
| /* <Return> */ |
| /* FreeType error code. 0 means success. */ |
| /* */ |
| FT_LOCAL_DEF( FT_Error ) |
| tt_face_load_loca( TT_Face face, |
| FT_Stream stream ) |
| { |
| FT_Error error; |
| FT_ULong table_len; |
| FT_Int shift; |
| |
| |
| /* we need the size of the `glyf' table for malformed `loca' tables */ |
| error = face->goto_table( face, TTAG_glyf, stream, &face->glyf_len ); |
| |
| /* it is possible that a font doesn't have a glyf table at all */ |
| /* or its size is zero */ |
| if ( FT_ERR_EQ( error, Table_Missing ) ) |
| { |
| face->glyf_len = 0; |
| face->glyf_offset = 0; |
| } |
| else if ( error ) |
| goto Exit; |
| else |
| { |
| #ifdef FT_CONFIG_OPTION_INCREMENTAL |
| if ( face->root.internal->incremental_interface ) |
| face->glyf_offset = 0; |
| else |
| #endif |
| face->glyf_offset = FT_STREAM_POS(); |
| } |
| |
| FT_TRACE2(( "Locations " )); |
| error = face->goto_table( face, TTAG_loca, stream, &table_len ); |
| if ( error ) |
| { |
| error = FT_THROW( Locations_Missing ); |
| goto Exit; |
| } |
| |
| if ( face->header.Index_To_Loc_Format != 0 ) |
| { |
| shift = 2; |
| |
| if ( table_len >= 0x40000L ) |
| { |
| FT_TRACE2(( "table too large\n" )); |
| table_len = 0x3FFFFL; |
| } |
| face->num_locations = table_len >> shift; |
| } |
| else |
| { |
| shift = 1; |
| |
| if ( table_len >= 0x20000L ) |
| { |
| FT_TRACE2(( "table too large\n" )); |
| table_len = 0x1FFFFL; |
| } |
| face->num_locations = table_len >> shift; |
| } |
| |
| if ( face->num_locations != (FT_ULong)face->root.num_glyphs + 1 ) |
| { |
| FT_TRACE2(( "glyph count mismatch! loca: %d, maxp: %d\n", |
| face->num_locations - 1, face->root.num_glyphs )); |
| |
| /* we only handle the case where `maxp' gives a larger value */ |
| if ( face->num_locations <= (FT_ULong)face->root.num_glyphs ) |
| { |
| FT_ULong new_loca_len = |
| ( (FT_ULong)face->root.num_glyphs + 1 ) << shift; |
| |
| TT_Table entry = face->dir_tables; |
| TT_Table limit = entry + face->num_tables; |
| |
| FT_Long pos = (FT_Long)FT_STREAM_POS(); |
| FT_Long dist = 0x7FFFFFFFL; |
| FT_Bool found = 0; |
| |
| |
| /* compute the distance to next table in font file */ |
| for ( ; entry < limit; entry++ ) |
| { |
| FT_Long diff = (FT_Long)entry->Offset - pos; |
| |
| |
| if ( diff > 0 && diff < dist ) |
| { |
| dist = diff; |
| found = 1; |
| } |
| } |
| |
| if ( !found ) |
| { |
| /* `loca' is the last table */ |
| dist = (FT_Long)stream->size - pos; |
| } |
| |
| if ( new_loca_len <= (FT_ULong)dist ) |
| { |
| face->num_locations = (FT_ULong)face->root.num_glyphs + 1; |
| table_len = new_loca_len; |
| |
| FT_TRACE2(( "adjusting num_locations to %d\n", |
| face->num_locations )); |
| } |
| else |
| { |
| face->root.num_glyphs = face->num_locations |
| ? (FT_Long)face->num_locations - 1 : 0; |
| |
| FT_TRACE2(( "adjusting num_glyphs to %d\n", |
| face->root.num_glyphs )); |
| } |
| } |
| } |
| |
| /* |
| * Extract the frame. We don't need to decompress it since |
| * we are able to parse it directly. |
| */ |
| if ( FT_FRAME_EXTRACT( table_len, face->glyph_locations ) ) |
| goto Exit; |
| |
| FT_TRACE2(( "loaded\n" )); |
| |
| Exit: |
| return error; |
| } |
| |
| |
| FT_LOCAL_DEF( FT_ULong ) |
| tt_face_get_location( TT_Face face, |
| FT_UInt gindex, |
| FT_UInt *asize ) |
| { |
| FT_ULong pos1, pos2; |
| FT_Byte* p; |
| FT_Byte* p_limit; |
| |
| |
| pos1 = pos2 = 0; |
| |
| if ( gindex < face->num_locations ) |
| { |
| if ( face->header.Index_To_Loc_Format != 0 ) |
| { |
| p = face->glyph_locations + gindex * 4; |
| p_limit = face->glyph_locations + face->num_locations * 4; |
| |
| pos1 = FT_NEXT_ULONG( p ); |
| pos2 = pos1; |
| |
| if ( p + 4 <= p_limit ) |
| pos2 = FT_NEXT_ULONG( p ); |
| } |
| else |
| { |
| p = face->glyph_locations + gindex * 2; |
| p_limit = face->glyph_locations + face->num_locations * 2; |
| |
| pos1 = FT_NEXT_USHORT( p ); |
| pos2 = pos1; |
| |
| if ( p + 2 <= p_limit ) |
| pos2 = FT_NEXT_USHORT( p ); |
| |
| pos1 <<= 1; |
| pos2 <<= 1; |
| } |
| } |
| |
| /* Check broken location data. */ |
| if ( pos1 > face->glyf_len ) |
| { |
| FT_TRACE1(( "tt_face_get_location:" |
| " too large offset (0x%08lx) found for glyph index %ld,\n" |
| " " |
| " exceeding the end of `glyf' table (0x%08lx)\n", |
| pos1, gindex, face->glyf_len )); |
| *asize = 0; |
| return 0; |
| } |
| |
| if ( pos2 > face->glyf_len ) |
| { |
| /* We try to sanitize the last `loca' entry. */ |
| if ( gindex == face->num_locations - 2 ) |
| { |
| FT_TRACE1(( "tt_face_get_location:" |
| " too large size (%ld bytes) found for glyph index %ld,\n" |
| " " |
| " truncating at the end of `glyf' table to %ld bytes\n", |
| pos2 - pos1, gindex, face->glyf_len - pos1 )); |
| pos2 = face->glyf_len; |
| } |
| else |
| { |
| FT_TRACE1(( "tt_face_get_location:" |
| " too large offset (0x%08lx) found for glyph index %ld,\n" |
| " " |
| " exceeding the end of `glyf' table (0x%08lx)\n", |
| pos2, gindex + 1, face->glyf_len )); |
| *asize = 0; |
| return 0; |
| } |
| } |
| |
| /* The `loca' table must be ordered; it refers to the length of */ |
| /* an entry as the difference between the current and the next */ |
| /* position. However, there do exist (malformed) fonts which */ |
| /* don't obey this rule, so we are only able to provide an */ |
| /* upper bound for the size. */ |
| /* */ |
| /* We get (intentionally) a wrong, non-zero result in case the */ |
| /* `glyf' table is missing. */ |
| if ( pos2 >= pos1 ) |
| *asize = (FT_UInt)( pos2 - pos1 ); |
| else |
| *asize = (FT_UInt)( face->glyf_len - pos1 ); |
| |
| return pos1; |
| } |
| |
| |
| FT_LOCAL_DEF( void ) |
| tt_face_done_loca( TT_Face face ) |
| { |
| FT_Stream stream = face->root.stream; |
| |
| |
| FT_FRAME_RELEASE( face->glyph_locations ); |
| face->num_locations = 0; |
| } |
| |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <Function> */ |
| /* tt_face_load_cvt */ |
| /* */ |
| /* <Description> */ |
| /* Load the control value table into a face object. */ |
| /* */ |
| /* <InOut> */ |
| /* face :: A handle to the target face object. */ |
| /* */ |
| /* <Input> */ |
| /* stream :: A handle to the input stream. */ |
| /* */ |
| /* <Return> */ |
| /* FreeType error code. 0 means success. */ |
| /* */ |
| FT_LOCAL_DEF( FT_Error ) |
| tt_face_load_cvt( TT_Face face, |
| FT_Stream stream ) |
| { |
| #ifdef TT_USE_BYTECODE_INTERPRETER |
| |
| FT_Error error; |
| FT_Memory memory = stream->memory; |
| FT_ULong table_len; |
| |
| |
| FT_TRACE2(( "CVT " )); |
| |
| error = face->goto_table( face, TTAG_cvt, stream, &table_len ); |
| if ( error ) |
| { |
| FT_TRACE2(( "is missing\n" )); |
| |
| face->cvt_size = 0; |
| face->cvt = NULL; |
| error = FT_Err_Ok; |
| |
| goto Exit; |
| } |
| |
| face->cvt_size = table_len / 2; |
| |
| if ( FT_NEW_ARRAY( face->cvt, face->cvt_size ) ) |
| goto Exit; |
| |
| if ( FT_FRAME_ENTER( face->cvt_size * 2L ) ) |
| goto Exit; |
| |
| { |
| FT_Short* cur = face->cvt; |
| FT_Short* limit = cur + face->cvt_size; |
| |
| |
| for ( ; cur < limit; cur++ ) |
| *cur = FT_GET_SHORT(); |
| } |
| |
| FT_FRAME_EXIT(); |
| FT_TRACE2(( "loaded\n" )); |
| |
| #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT |
| if ( face->doblend ) |
| error = tt_face_vary_cvt( face, stream ); |
| #endif |
| |
| Exit: |
| return error; |
| |
| #else /* !TT_USE_BYTECODE_INTERPRETER */ |
| |
| FT_UNUSED( face ); |
| FT_UNUSED( stream ); |
| |
| return FT_Err_Ok; |
| |
| #endif |
| } |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <Function> */ |
| /* tt_face_load_fpgm */ |
| /* */ |
| /* <Description> */ |
| /* Load the font program. */ |
| /* */ |
| /* <InOut> */ |
| /* face :: A handle to the target face object. */ |
| /* */ |
| /* <Input> */ |
| /* stream :: A handle to the input stream. */ |
| /* */ |
| /* <Return> */ |
| /* FreeType error code. 0 means success. */ |
| /* */ |
| FT_LOCAL_DEF( FT_Error ) |
| tt_face_load_fpgm( TT_Face face, |
| FT_Stream stream ) |
| { |
| #ifdef TT_USE_BYTECODE_INTERPRETER |
| |
| FT_Error error; |
| FT_ULong table_len; |
| |
| |
| FT_TRACE2(( "Font program " )); |
| |
| /* The font program is optional */ |
| error = face->goto_table( face, TTAG_fpgm, stream, &table_len ); |
| if ( error ) |
| { |
| face->font_program = NULL; |
| face->font_program_size = 0; |
| error = FT_Err_Ok; |
| |
| FT_TRACE2(( "is missing\n" )); |
| } |
| else |
| { |
| face->font_program_size = table_len; |
| if ( FT_FRAME_EXTRACT( table_len, face->font_program ) ) |
| goto Exit; |
| |
| FT_TRACE2(( "loaded, %12d bytes\n", face->font_program_size )); |
| } |
| |
| Exit: |
| return error; |
| |
| #else /* !TT_USE_BYTECODE_INTERPRETER */ |
| |
| FT_UNUSED( face ); |
| FT_UNUSED( stream ); |
| |
| return FT_Err_Ok; |
| |
| #endif |
| } |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <Function> */ |
| /* tt_face_load_prep */ |
| /* */ |
| /* <Description> */ |
| /* Load the cvt program. */ |
| /* */ |
| /* <InOut> */ |
| /* face :: A handle to the target face object. */ |
| /* */ |
| /* <Input> */ |
| /* stream :: A handle to the input stream. */ |
| /* */ |
| /* <Return> */ |
| /* FreeType error code. 0 means success. */ |
| /* */ |
| FT_LOCAL_DEF( FT_Error ) |
| tt_face_load_prep( TT_Face face, |
| FT_Stream stream ) |
| { |
| #ifdef TT_USE_BYTECODE_INTERPRETER |
| |
| FT_Error error; |
| FT_ULong table_len; |
| |
| |
| FT_TRACE2(( "Prep program " )); |
| |
| error = face->goto_table( face, TTAG_prep, stream, &table_len ); |
| if ( error ) |
| { |
| face->cvt_program = NULL; |
| face->cvt_program_size = 0; |
| error = FT_Err_Ok; |
| |
| FT_TRACE2(( "is missing\n" )); |
| } |
| else |
| { |
| face->cvt_program_size = table_len; |
| if ( FT_FRAME_EXTRACT( table_len, face->cvt_program ) ) |
| goto Exit; |
| |
| FT_TRACE2(( "loaded, %12d bytes\n", face->cvt_program_size )); |
| } |
| |
| Exit: |
| return error; |
| |
| #else /* !TT_USE_BYTECODE_INTERPRETER */ |
| |
| FT_UNUSED( face ); |
| FT_UNUSED( stream ); |
| |
| return FT_Err_Ok; |
| |
| #endif |
| } |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <Function> */ |
| /* tt_face_load_hdmx */ |
| /* */ |
| /* <Description> */ |
| /* Load the `hdmx' table into the face object. */ |
| /* */ |
| /* <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_hdmx( TT_Face face, |
| FT_Stream stream ) |
| { |
| FT_Error error; |
| FT_Memory memory = stream->memory; |
| FT_UInt nn, num_records; |
| FT_ULong table_size, record_size; |
| FT_Byte* p; |
| FT_Byte* limit; |
| |
| |
| /* this table is optional */ |
| error = face->goto_table( face, TTAG_hdmx, stream, &table_size ); |
| if ( error || table_size < 8 ) |
| return FT_Err_Ok; |
| |
| if ( FT_FRAME_EXTRACT( table_size, face->hdmx_table ) ) |
| goto Exit; |
| |
| p = face->hdmx_table; |
| limit = p + table_size; |
| |
| /* Given that `hdmx' tables are losing its importance (for example, */ |
| /* variation fonts introduced in OpenType 1.8 must not have this */ |
| /* table) we no longer test for a correct `version' field. */ |
| p += 2; |
| num_records = FT_NEXT_USHORT( p ); |
| record_size = FT_NEXT_ULONG( p ); |
| |
| /* The maximum number of bytes in an hdmx device record is the */ |
| /* maximum number of glyphs + 2; this is 0xFFFF + 2, thus */ |
| /* explaining why `record_size' is a long (which we read as */ |
| /* unsigned long for convenience). In practice, two bytes are */ |
| /* sufficient to hold the size value. */ |
| /* */ |
| /* There are at least two fonts, HANNOM-A and HANNOM-B version */ |
| /* 2.0 (2005), which get this wrong: The upper two bytes of */ |
| /* the size value are set to 0xFF instead of 0x00. We catch */ |
| /* and fix this. */ |
| |
| if ( record_size >= 0xFFFF0000UL ) |
| record_size &= 0xFFFFU; |
| |
| /* The limit for `num_records' is a heuristic value. */ |
| if ( num_records > 255 || |
| ( num_records > 0 && |
| ( record_size > 0x10001L || |
| record_size < 4 ) ) ) |
| { |
| error = FT_THROW( Invalid_File_Format ); |
| goto Fail; |
| } |
| |
| if ( FT_NEW_ARRAY( face->hdmx_record_sizes, num_records ) ) |
| goto Fail; |
| |
| for ( nn = 0; nn < num_records; nn++ ) |
| { |
| if ( p + record_size > limit ) |
| break; |
| |
| face->hdmx_record_sizes[nn] = p[0]; |
| p += record_size; |
| } |
| |
| face->hdmx_record_count = nn; |
| face->hdmx_table_size = table_size; |
| face->hdmx_record_size = record_size; |
| |
| Exit: |
| return error; |
| |
| Fail: |
| FT_FRAME_RELEASE( face->hdmx_table ); |
| face->hdmx_table_size = 0; |
| goto Exit; |
| } |
| |
| |
| FT_LOCAL_DEF( void ) |
| tt_face_free_hdmx( TT_Face face ) |
| { |
| FT_Stream stream = face->root.stream; |
| FT_Memory memory = stream->memory; |
| |
| |
| FT_FREE( face->hdmx_record_sizes ); |
| FT_FRAME_RELEASE( face->hdmx_table ); |
| } |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* Return the advance width table for a given pixel size if it is found */ |
| /* in the font's `hdmx' table (if any). */ |
| /* */ |
| FT_LOCAL_DEF( FT_Byte* ) |
| tt_face_get_device_metrics( TT_Face face, |
| FT_UInt ppem, |
| FT_UInt gindex ) |
| { |
| FT_UInt nn; |
| FT_Byte* result = NULL; |
| FT_ULong record_size = face->hdmx_record_size; |
| FT_Byte* record = face->hdmx_table + 8; |
| |
| |
| for ( nn = 0; nn < face->hdmx_record_count; nn++ ) |
| if ( face->hdmx_record_sizes[nn] == ppem ) |
| { |
| gindex += 2; |
| if ( gindex < record_size ) |
| result = record + nn * record_size + gindex; |
| break; |
| } |
| |
| return result; |
| } |
| |
| |
| /* END */ |
