1 /***************************************************************************/
5 /* OpenType GDEF table validation (body). */
7 /* Copyright 2004, 2005, 2007 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 /***************************************************************************/
23 /*************************************************************************/
25 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */
26 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
27 /* messages during execution. */
30 #define FT_COMPONENT trace_otvgdef
33 /*************************************************************************/
34 /*************************************************************************/
36 /***** UTILITY FUNCTIONS *****/
38 /*************************************************************************/
39 /*************************************************************************/
41 #define AttachListFunc otv_O_x_Ox
42 #define LigCaretListFunc otv_O_x_Ox
44 /* sets valid->extra1 (0) */
47 otv_O_x_Ox( FT_Bytes table,
53 OTV_Validate_Func func;
59 Coverage = table + FT_NEXT_USHORT( p );
60 GlyphCount = FT_NEXT_USHORT( p );
62 OTV_TRACE(( " (GlyphCount = %d)\n", GlyphCount ));
64 otv_Coverage_validate( Coverage, valid, GlyphCount );
65 if ( GlyphCount != otv_Coverage_get_count( Coverage ) )
68 OTV_LIMIT_CHECK( GlyphCount * 2 );
70 valid->nesting_level++;
71 func = valid->func[valid->nesting_level];
74 for ( ; GlyphCount > 0; GlyphCount-- )
75 func( table + FT_NEXT_USHORT( p ), valid );
77 valid->nesting_level--;
83 /*************************************************************************/
84 /*************************************************************************/
86 /***** LIGATURE CARETS *****/
88 /*************************************************************************/
89 /*************************************************************************/
91 #define CaretValueFunc otv_CaretValue_validate
94 otv_CaretValue_validate( FT_Bytes table,
98 FT_UInt CaretValueFormat;
103 OTV_LIMIT_CHECK( 4 );
105 CaretValueFormat = FT_NEXT_USHORT( p );
107 OTV_TRACE(( " (format = %d)\n", CaretValueFormat ));
109 switch ( CaretValueFormat )
111 case 1: /* CaretValueFormat1 */
112 /* skip Coordinate, no test */
115 case 2: /* CaretValueFormat2 */
116 /* skip CaretValuePoint, no test */
119 case 3: /* CaretValueFormat3 */
120 p += 2; /* skip Coordinate */
122 OTV_LIMIT_CHECK( 2 );
125 otv_Device_validate( table + FT_NEXT_USHORT( p ), valid );
136 /*************************************************************************/
137 /*************************************************************************/
139 /***** GDEF TABLE *****/
141 /*************************************************************************/
142 /*************************************************************************/
144 /* sets valid->glyph_count */
147 otv_GDEF_validate( FT_Bytes table,
151 FT_Validator ftvalid )
153 OTV_ValidatorRec validrec;
154 OTV_Validator valid = &validrec;
157 FT_Bool need_MarkAttachClassDef;
159 OTV_OPTIONAL_TABLE( GlyphClassDef );
160 OTV_OPTIONAL_TABLE( AttachListOffset );
161 OTV_OPTIONAL_TABLE( LigCaretListOffset );
162 OTV_OPTIONAL_TABLE( MarkAttachClassDef );
165 valid->root = ftvalid;
167 FT_TRACE3(( "validating GDEF table\n" ));
170 OTV_LIMIT_CHECK( 12 );
172 if ( FT_NEXT_ULONG( p ) != 0x10000UL ) /* Version */
175 /* MarkAttachClassDef has been added to the OpenType */
176 /* specification without increasing GDEF's version, */
177 /* so we use this ugly hack to find out whether the */
178 /* table is needed actually. */
180 need_MarkAttachClassDef = FT_BOOL(
181 otv_GSUBGPOS_have_MarkAttachmentType_flag( gsub ) ||
182 otv_GSUBGPOS_have_MarkAttachmentType_flag( gpos ) );
184 if ( need_MarkAttachClassDef )
185 table_size = 12; /* OpenType >= 1.2 */
187 table_size = 10; /* OpenType < 1.2 */
189 valid->glyph_count = glyph_count;
191 OTV_OPTIONAL_OFFSET( GlyphClassDef );
192 OTV_SIZE_CHECK( GlyphClassDef );
194 otv_ClassDef_validate( table + GlyphClassDef, valid );
196 OTV_OPTIONAL_OFFSET( AttachListOffset );
197 OTV_SIZE_CHECK( AttachListOffset );
198 if ( AttachListOffset )
200 OTV_NEST2( AttachList, AttachPoint );
201 OTV_RUN( table + AttachListOffset, valid );
204 OTV_OPTIONAL_OFFSET( LigCaretListOffset );
205 OTV_SIZE_CHECK( LigCaretListOffset );
206 if ( LigCaretListOffset )
208 OTV_NEST3( LigCaretList, LigGlyph, CaretValue );
209 OTV_RUN( table + LigCaretListOffset, valid );
212 if ( need_MarkAttachClassDef )
214 OTV_OPTIONAL_OFFSET( MarkAttachClassDef );
215 OTV_SIZE_CHECK( MarkAttachClassDef );
216 if ( MarkAttachClassDef )
217 otv_ClassDef_validate( table + MarkAttachClassDef, valid );