1 /***************************************************************************/
5 /* FreeType's OpenType validation module implementation (body). */
7 /* Copyright 2004-2008, 2013 by */
8 /* David Turner, Robert Wilhelm, and Werner Lemberg. */
10 /* This file is part of the FreeType project, and may only be used, */
11 /* modified, and distributed under the terms of the FreeType project */
12 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */
13 /* this file you indicate that you have read the license and */
14 /* understand and accept it fully. */
16 /***************************************************************************/
20 #include FT_TRUETYPE_TABLES_H
21 #include FT_TRUETYPE_TAGS_H
22 #include FT_OPENTYPE_VALIDATE_H
23 #include FT_INTERNAL_OBJECTS_H
24 #include FT_SERVICE_OPENTYPE_VALIDATE_H
31 /*************************************************************************/
33 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */
34 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
35 /* messages during execution. */
38 #define FT_COMPONENT trace_otvmodule
42 otv_load_table( FT_Face face,
44 FT_Byte* volatile* table,
48 FT_Memory memory = FT_FACE_MEMORY( face );
51 error = FT_Load_Sfnt_Table( face, tag, 0, NULL, table_len );
52 if ( FT_ERR_EQ( error, Table_Missing ) )
57 if ( FT_ALLOC( *table, *table_len ) )
60 error = FT_Load_Sfnt_Table( face, tag, 0, *table, table_len );
68 otv_validate( FT_Face volatile face,
76 FT_Error error = FT_Err_Ok;
77 FT_Byte* volatile base;
78 FT_Byte* volatile gdef;
79 FT_Byte* volatile gpos;
80 FT_Byte* volatile gsub;
81 FT_Byte* volatile jstf;
82 FT_Byte* volatile math;
83 FT_ULong len_base, len_gdef, len_gpos, len_gsub, len_jstf;
85 FT_UInt num_glyphs = (FT_UInt)face->num_glyphs;
86 FT_ValidatorRec volatile valid;
89 base = gdef = gpos = gsub = jstf = math = NULL;
90 len_base = len_gdef = len_gpos = len_gsub = len_jstf = len_math = 0;
93 * XXX: OpenType tables cannot handle 32-bit glyph index,
94 * although broken TrueType can have 32-bit glyph index.
96 if ( face->num_glyphs > 0xFFFFL )
98 FT_TRACE1(( "otv_validate: Invalid glyphs index (0x0000FFFF - 0x%08x) ",
100 FT_TRACE1(( "are not handled by OpenType tables\n" ));
106 if ( ot_flags & FT_VALIDATE_BASE )
108 error = otv_load_table( face, TTAG_BASE, &base, &len_base );
113 if ( ot_flags & FT_VALIDATE_GDEF )
115 error = otv_load_table( face, TTAG_GDEF, &gdef, &len_gdef );
120 if ( ot_flags & FT_VALIDATE_GPOS )
122 error = otv_load_table( face, TTAG_GPOS, &gpos, &len_gpos );
127 if ( ot_flags & FT_VALIDATE_GSUB )
129 error = otv_load_table( face, TTAG_GSUB, &gsub, &len_gsub );
134 if ( ot_flags & FT_VALIDATE_JSTF )
136 error = otv_load_table( face, TTAG_JSTF, &jstf, &len_jstf );
141 if ( ot_flags & FT_VALIDATE_MATH )
143 error = otv_load_table( face, TTAG_MATH, &math, &len_math );
148 /* validate tables */
152 ft_validator_init( &valid, base, base + len_base, FT_VALIDATE_DEFAULT );
153 if ( ft_setjmp( valid.jump_buffer ) == 0 )
154 otv_BASE_validate( base, &valid );
162 ft_validator_init( &valid, gpos, gpos + len_gpos, FT_VALIDATE_DEFAULT );
163 if ( ft_setjmp( valid.jump_buffer ) == 0 )
164 otv_GPOS_validate( gpos, num_glyphs, &valid );
172 ft_validator_init( &valid, gsub, gsub + len_gsub, FT_VALIDATE_DEFAULT );
173 if ( ft_setjmp( valid.jump_buffer ) == 0 )
174 otv_GSUB_validate( gsub, num_glyphs, &valid );
182 ft_validator_init( &valid, gdef, gdef + len_gdef, FT_VALIDATE_DEFAULT );
183 if ( ft_setjmp( valid.jump_buffer ) == 0 )
184 otv_GDEF_validate( gdef, gsub, gpos, num_glyphs, &valid );
192 ft_validator_init( &valid, jstf, jstf + len_jstf, FT_VALIDATE_DEFAULT );
193 if ( ft_setjmp( valid.jump_buffer ) == 0 )
194 otv_JSTF_validate( jstf, gsub, gpos, num_glyphs, &valid );
202 ft_validator_init( &valid, math, math + len_math, FT_VALIDATE_DEFAULT );
203 if ( ft_setjmp( valid.jump_buffer ) == 0 )
204 otv_MATH_validate( math, num_glyphs, &valid );
210 *ot_base = (FT_Bytes)base;
211 *ot_gdef = (FT_Bytes)gdef;
212 *ot_gpos = (FT_Bytes)gpos;
213 *ot_gsub = (FT_Bytes)gsub;
214 *ot_jstf = (FT_Bytes)jstf;
219 FT_Memory memory = FT_FACE_MEMORY( face );
230 FT_Memory memory = FT_FACE_MEMORY( face );
233 FT_FREE( math ); /* Can't return this as API is frozen */
241 const FT_Service_OTvalidateRec otvalid_interface =
248 const FT_ServiceDescRec otvalid_services[] =
250 { FT_SERVICE_ID_OPENTYPE_VALIDATE, &otvalid_interface },
256 otvalid_get_service( FT_Module module,
257 const char* service_id )
261 return ft_service_list_lookup( otvalid_services, service_id );
265 FT_CALLBACK_TABLE_DEF
266 const FT_Module_Class otv_module_class =
269 sizeof ( FT_ModuleRec ),
274 0, /* module-specific interface */
276 (FT_Module_Constructor)0,
277 (FT_Module_Destructor) 0,
278 (FT_Module_Requester) otvalid_get_service