| /***************************************************************************/ |
| /* */ |
| /* otvmod.c */ |
| /* */ |
| /* FreeType's OpenType validation module implementation (body). */ |
| /* */ |
| /* Copyright 2004, 2005 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_TRUETYPE_TABLES_H |
| #include FT_TRUETYPE_TAGS_H |
| #include FT_OPENTYPE_VALIDATE_H |
| #include FT_INTERNAL_OBJECTS_H |
| #include FT_SERVICE_OPENTYPE_VALIDATE_H |
| |
| #include "otvmod.h" |
| #include "otvalid.h" |
| #include "otvcommn.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_otvmodule |
| |
| |
| static FT_Error |
| otv_load_table( FT_Face face, |
| FT_Tag tag, |
| FT_Byte* *table, |
| FT_ULong *table_len ) |
| { |
| FT_Error error; |
| FT_Memory memory = FT_FACE_MEMORY( face ); |
| |
| |
| error = FT_Load_Sfnt_Table( face, tag, 0, NULL, table_len ); |
| if ( error == OTV_Err_Table_Missing ) |
| return OTV_Err_Ok; |
| if ( error ) |
| goto Exit; |
| |
| if ( FT_ALLOC( *table, *table_len ) ) |
| goto Exit; |
| |
| error = FT_Load_Sfnt_Table( face, tag, 0, *table, table_len ); |
| |
| Exit: |
| return error; |
| } |
| |
| |
| static FT_Error |
| otv_validate( FT_Face face, |
| FT_UInt ot_flags, |
| FT_Bytes *ot_base, |
| FT_Bytes *ot_gdef, |
| FT_Bytes *ot_gpos, |
| FT_Bytes *ot_gsub, |
| FT_Bytes *ot_jstf ) |
| { |
| FT_Error error = OTV_Err_Ok; |
| FT_Byte *base, *gdef, *gpos, *gsub, *jstf; |
| FT_ULong len_base, len_gdef, len_gpos, len_gsub, len_jstf; |
| FT_ValidatorRec valid; |
| |
| |
| base = gdef = gpos = gsub = jstf = NULL; |
| len_base = len_gdef = len_gpos = len_gsub = len_jstf = 0; |
| |
| /* load tables */ |
| |
| if ( ot_flags & FT_VALIDATE_BASE ) |
| { |
| error = otv_load_table( face, TTAG_BASE, &base, &len_base ); |
| if ( error ) |
| goto Exit; |
| } |
| |
| if ( ot_flags & FT_VALIDATE_GDEF ) |
| { |
| error = otv_load_table( face, TTAG_GDEF, &gdef, &len_gdef ); |
| if ( error ) |
| goto Exit; |
| } |
| |
| if ( ot_flags & FT_VALIDATE_GPOS ) |
| { |
| error = otv_load_table( face, TTAG_GPOS, &gpos, &len_gpos ); |
| if ( error ) |
| goto Exit; |
| } |
| |
| if ( ot_flags & FT_VALIDATE_GSUB ) |
| { |
| error = otv_load_table( face, TTAG_GSUB, &gsub, &len_gsub ); |
| if ( error ) |
| goto Exit; |
| } |
| |
| if ( ot_flags & FT_VALIDATE_JSTF ) |
| { |
| error = otv_load_table( face, TTAG_JSTF, &jstf, &len_jstf ); |
| if ( error ) |
| goto Exit; |
| } |
| |
| /* validate tables */ |
| |
| if ( base ) |
| { |
| ft_validator_init( &valid, base, base + len_base, FT_VALIDATE_DEFAULT ); |
| if ( ft_validator_run( &valid ) == 0 ) |
| otv_BASE_validate( base, &valid ); |
| error = valid.error; |
| if ( error ) |
| goto Exit; |
| } |
| |
| if ( gpos ) |
| { |
| ft_validator_init( &valid, gpos, gpos + len_gpos, FT_VALIDATE_DEFAULT ); |
| if ( ft_validator_run( &valid ) == 0 ) |
| otv_GPOS_validate( gpos, face->num_glyphs, &valid ); |
| error = valid.error; |
| if ( error ) |
| goto Exit; |
| } |
| |
| if ( gsub ) |
| { |
| ft_validator_init( &valid, gsub, gsub + len_gsub, FT_VALIDATE_DEFAULT ); |
| if ( ft_validator_run( &valid ) == 0 ) |
| otv_GSUB_validate( gsub, face->num_glyphs, &valid ); |
| error = valid.error; |
| if ( error ) |
| goto Exit; |
| } |
| |
| if ( gdef ) |
| { |
| ft_validator_init( &valid, gdef, gdef + len_gdef, FT_VALIDATE_DEFAULT ); |
| if ( ft_validator_run( &valid ) == 0 ) |
| otv_GDEF_validate( gdef, gsub, gpos, &valid ); |
| error = valid.error; |
| if ( error ) |
| goto Exit; |
| } |
| |
| if ( jstf ) |
| { |
| ft_validator_init( &valid, jstf, jstf + len_jstf, FT_VALIDATE_DEFAULT ); |
| if ( ft_validator_run( &valid ) == 0 ) |
| otv_JSTF_validate( jstf, gsub, gpos, face->num_glyphs, &valid ); |
| error = valid.error; |
| if ( error ) |
| goto Exit; |
| } |
| |
| *ot_base = (FT_Bytes)base; |
| *ot_gdef = (FT_Bytes)gdef; |
| *ot_gpos = (FT_Bytes)gpos; |
| *ot_gsub = (FT_Bytes)gsub; |
| *ot_jstf = (FT_Bytes)jstf; |
| |
| Exit: |
| if ( error ) { |
| FT_Memory memory = FT_FACE_MEMORY( face ); |
| |
| |
| FT_FREE( base ); |
| FT_FREE( gdef ); |
| FT_FREE( gpos ); |
| FT_FREE( gsub ); |
| FT_FREE( jstf ); |
| } |
| |
| return error; |
| } |
| |
| |
| static |
| const FT_Service_OTvalidateRec otvalid_interface = |
| { |
| otv_validate |
| }; |
| |
| |
| static |
| const FT_ServiceDescRec otvalid_services[] = |
| { |
| { FT_SERVICE_ID_OPENTYPE_VALIDATE, &otvalid_interface }, |
| { NULL, NULL } |
| }; |
| |
| |
| static FT_Pointer |
| otvalid_get_service( FT_Module module, |
| const char* service_id ) |
| { |
| FT_UNUSED( module ); |
| |
| return ft_service_list_lookup( otvalid_services, service_id ); |
| } |
| |
| |
| FT_CALLBACK_TABLE_DEF |
| const FT_Module_Class otv_module_class = |
| { |
| 0, |
| sizeof( FT_ModuleRec ), |
| "otvalid", |
| 0x10000L, |
| 0x20000L, |
| |
| 0, /* module-specific interface */ |
| |
| (FT_Module_Constructor)0, |
| (FT_Module_Destructor) 0, |
| (FT_Module_Requester) otvalid_get_service |
| }; |
| |
| |
| /* END */ |
