1 /***************************************************************************/
5 /* TrueTypeGX/AAT opbd 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_gxvopbd
41 /*************************************************************************/
42 /*************************************************************************/
44 /***** Data and Types *****/
46 /*************************************************************************/
47 /*************************************************************************/
49 typedef struct GXV_opbd_DataRec_
52 FT_UShort valueOffset_min;
54 } GXV_opbd_DataRec, *GXV_opbd_Data;
57 #define GXV_OPBD_DATA( FIELD ) GXV_TABLE_DATA( opbd, FIELD )
60 /*************************************************************************/
61 /*************************************************************************/
63 /***** UTILITY FUNCTIONS *****/
65 /*************************************************************************/
66 /*************************************************************************/
69 gxv_opbd_LookupValue_validate( FT_UShort glyph,
70 GXV_LookupValueCPtr value_p,
73 /* offset in LookupTable is measured from the head of opbd table */
74 FT_Bytes p = valid->root->base + value_p->u;
75 FT_Bytes limit = valid->root->limit;
80 if ( value_p->u < GXV_OPBD_DATA( valueOffset_min ) )
81 GXV_OPBD_DATA( valueOffset_min ) = value_p->u;
83 for ( i = 0; i < 4; i++ )
86 delta_value = FT_NEXT_SHORT( p );
88 if ( GXV_OPBD_DATA( format ) ) /* format 1, value is ctrl pt. */
90 if ( delta_value == -1 )
93 gxv_ctlPoint_validate( glyph, delta_value, valid );
95 else /* format 0, value is distance */
102 opbd ---------------------+
111 | firstGlyph[0] | | head of opbd sfnt table
112 +---------------+ | +
113 | offset[0] | -> | offset [byte]
114 +===============+ | +
115 | lastGlyph[1] | | (glyphID - firstGlyph) * 4 * sizeof(FT_Short) [byte]
133 static GXV_LookupValueDesc
134 gxv_opbd_LookupFmt4_transit( FT_UShort relative_gindex,
135 GXV_LookupValueCPtr base_value_p,
136 FT_Bytes lookuptbl_limit,
137 GXV_Validator valid )
139 GXV_LookupValueDesc value;
141 FT_UNUSED( lookuptbl_limit );
144 /* XXX: check range? */
145 value.u = (FT_UShort)( base_value_p->u +
146 relative_gindex * 4 * sizeof ( FT_Short ) );
152 /*************************************************************************/
153 /*************************************************************************/
155 /***** opbd TABLE *****/
157 /*************************************************************************/
158 /*************************************************************************/
161 gxv_opbd_validate( FT_Bytes table,
163 FT_Validator ftvalid )
165 GXV_ValidatorRec validrec;
166 GXV_Validator valid = &validrec;
167 GXV_opbd_DataRec opbdrec;
168 GXV_opbd_Data opbd = &opbdrec;
175 valid->root = ftvalid;
176 valid->table_data = opbd;
179 FT_TRACE3(( "validating `opbd' table\n" ));
181 GXV_OPBD_DATA( valueOffset_min ) = 0xFFFFU;
184 GXV_LIMIT_CHECK( 4 + 2 );
185 version = FT_NEXT_ULONG( p );
186 GXV_OPBD_DATA( format ) = FT_NEXT_USHORT( p );
189 /* only 0x00010000 is defined (1996) */
190 GXV_TRACE(( "(version=0x%08x)\n", version ));
191 if ( 0x00010000UL != version )
194 /* only values 0 and 1 are defined (1996) */
195 GXV_TRACE(( "(format=0x%04x)\n", GXV_OPBD_DATA( format ) ));
196 if ( 0x0001 < GXV_OPBD_DATA( format ) )
199 valid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED;
200 valid->lookupval_func = gxv_opbd_LookupValue_validate;
201 valid->lookupfmt4_trans = gxv_opbd_LookupFmt4_transit;
203 gxv_LookupTable_validate( p, limit, valid );
204 p += valid->subtable_length;
206 if ( p > table + GXV_OPBD_DATA( valueOffset_min ) )
209 "found overlap between LookupTable and opbd_value array\n" ));