1 /***************************************************************************/
5 /* TrueTypeGX/AAT lcar table validation (body). */
7 /* Copyright 2004, 2005 by suzuki toshiya, Masatake YAMATO, Red Hat K.K., */
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 /***************************************************************************/
18 /***************************************************************************/
20 /* gxvalid is derived from both gxlayout module and otvalid module. */
21 /* Development of gxlayout is supported by the Information-technology */
22 /* Promotion Agency(IPA), Japan. */
24 /***************************************************************************/
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_gxvlcar
41 /*************************************************************************/
42 /*************************************************************************/
44 /***** Data and Types *****/
46 /*************************************************************************/
47 /*************************************************************************/
49 typedef struct GXV_lcar_DataRec_
53 } GXV_lcar_DataRec, *GXV_lcar_Data;
56 #define GXV_LCAR_DATA( FIELD ) GXV_TABLE_DATA( lcar, FIELD )
59 /*************************************************************************/
60 /*************************************************************************/
62 /***** UTILITY FUNCTIONS *****/
64 /*************************************************************************/
65 /*************************************************************************/
68 gxv_lcar_partial_validate( FT_UShort partial,
70 GXV_Validator gxvalid )
72 GXV_NAME_ENTER( "partial" );
74 if ( GXV_LCAR_DATA( format ) != 1 )
77 gxv_ctlPoint_validate( glyph, partial, gxvalid );
85 gxv_lcar_LookupValue_validate( FT_UShort glyph,
86 GXV_LookupValueCPtr value_p,
87 GXV_Validator gxvalid )
89 FT_Bytes p = gxvalid->root->base + value_p->u;
90 FT_Bytes limit = gxvalid->root->limit;
96 GXV_NAME_ENTER( "element in lookupTable" );
99 count = FT_NEXT_USHORT( p );
101 GXV_LIMIT_CHECK( 2 * count );
102 for ( i = 0; i < count; i++ )
104 partial = FT_NEXT_SHORT( p );
105 gxv_lcar_partial_validate( partial, glyph, gxvalid );
113 +------ lcar --------------------+
115 | +===============+ |
117 | +===============+ |
118 | | BinSrchHeader | |
119 | +===============+ |
121 | +---------------+ |
122 | | firstGlyph[0] | | head of lcar sfnt table
123 | +---------------+ | +
124 | | offset[0] | -> | offset [byte]
125 | +===============+ | +
126 | | lastGlyph[1] | | (glyphID - firstGlyph) * 2 [byte]
127 | +---------------+ |
128 | | firstGlyph[1] | |
129 | +---------------+ |
131 | +===============+ |
135 | 16bit value array |
136 | +===============+ |
137 +------| value | <-------+
144 +----> lcar values...handled by lcar callback function
147 static GXV_LookupValueDesc
148 gxv_lcar_LookupFmt4_transit( FT_UShort relative_gindex,
149 GXV_LookupValueCPtr base_value_p,
150 FT_Bytes lookuptbl_limit,
151 GXV_Validator gxvalid )
156 GXV_LookupValueDesc value;
158 FT_UNUSED( lookuptbl_limit );
160 /* XXX: check range? */
161 offset = (FT_UShort)( base_value_p->u +
162 relative_gindex * sizeof ( FT_UShort ) );
163 p = gxvalid->root->base + offset;
164 limit = gxvalid->root->limit;
166 GXV_LIMIT_CHECK ( 2 );
167 value.u = FT_NEXT_USHORT( p );
173 /*************************************************************************/
174 /*************************************************************************/
176 /***** lcar TABLE *****/
178 /*************************************************************************/
179 /*************************************************************************/
182 gxv_lcar_validate( FT_Bytes table,
184 FT_Validator ftvalid )
188 GXV_ValidatorRec gxvalidrec;
189 GXV_Validator gxvalid = &gxvalidrec;
191 GXV_lcar_DataRec lcarrec;
192 GXV_lcar_Data lcar = &lcarrec;
197 gxvalid->root = ftvalid;
198 gxvalid->table_data = lcar;
199 gxvalid->face = face;
201 FT_TRACE3(( "validating `lcar' table\n" ));
204 GXV_LIMIT_CHECK( 4 + 2 );
205 version = FT_NEXT_ULONG( p );
206 GXV_LCAR_DATA( format ) = FT_NEXT_USHORT( p );
208 if ( version != 0x00010000UL)
211 if ( GXV_LCAR_DATA( format ) > 1 )
214 gxvalid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED;
215 gxvalid->lookupval_func = gxv_lcar_LookupValue_validate;
216 gxvalid->lookupfmt4_trans = gxv_lcar_LookupFmt4_transit;
217 gxv_LookupTable_validate( p, limit, gxvalid );