655 lines
18 KiB
C
655 lines
18 KiB
C
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#include "otlgsub.h"
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#include "otlcommn.h"
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/************************************************************************/
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/************************************************************************/
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/***** *****/
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/***** GSUB LOOKUP TYPE 1 *****/
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/***** *****/
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/************************************************************************/
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/************************************************************************/
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static void
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otl_gsub_lookup1_validate( OTL_Bytes table,
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OTL_Validator valid )
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{
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OTL_Bytes p = table;
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OTL_UInt format;
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OTL_CHECK( 2 );
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format = OTL_NEXT_USHORT( p );
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switch ( format )
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{
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case 1:
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{
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OTL_UInt coverage;
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OTL_CHECK( 4 );
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coverage = OTL_NEXT_USHORT( p );
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otl_coverage_validate( table + coverage, valid );
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}
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break;
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case 2:
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{
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OTL_UInt coverage, count;
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OTL_CHECK( 4 );
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coverage = OTL_NEXT_USHORT( p );
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count = OTL_NEXT_USHORT( p );
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otl_coverage_validate( table + coverage, valid );
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OTL_CHECK( 2*count );
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}
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break;
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default:
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OTL_INVALID_DATA;
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}
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}
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/************************************************************************/
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/************************************************************************/
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/***** *****/
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/***** GSUB LOOKUP TYPE 2 *****/
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/***** *****/
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/************************************************************************/
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/************************************************************************/
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static void
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otl_seq_validate( OTL_Bytes table,
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OTL_Validator valid )
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{
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OTL_Bytes p = table;
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OTL_UInt count;
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OTL_CHECK( 2 );
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count = OTL_NEXT_USHORT( p );
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OTL_CHECK( 2*count );
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/* check glyph indices */
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}
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static void
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otl_gsub_lookup2_validate( OTL_Bytes table,
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OTL_Validator valid )
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{
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OTL_Bytes p = table;
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OTL_UInt format, coverage;
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OTL_CHECK( 2 );
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format = OTL_NEXT_USHORT( p );
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switch ( format )
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{
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case 1:
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{
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OTL_UInt coverage, seq_count;
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OTL_CHECK( 4 );
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coverage = OTL_NEXT_USHORT( p );
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seq_count = OTL_NEXT_USHORT( p );
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otl_coverage_validate( table + coverage, valid );
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OTL_CHECK( seq_count*2 );
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for ( ; seq_count > 0; seq_count-- )
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otl_seq_validate( table + OTL_NEXT_USHORT( p ), valid );
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}
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break;
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default:
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OTL_INVALID_DATA;
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}
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}
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/************************************************************************/
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/************************************************************************/
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/***** *****/
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/***** GSUB LOOKUP TYPE 3 *****/
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/***** *****/
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/************************************************************************/
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/************************************************************************/
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static void
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otl_alternate_set_validate( OTL_Bytes table,
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OTL_Validator valid )
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{
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OTL_Bytes p = table;
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OTL_UInt count;
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OTL_CHECK( 2 );
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count = OTL_NEXT_USHORT( p );
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OTL_CHECK( 2*count );
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/* XXX: check glyph indices */
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}
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static void
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otl_gsub_lookup3_validate( OTL_Bytes table,
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OTL_Validator valid )
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{
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OTL_Bytes p = table;
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OTL_UInt format, coverage;
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OTL_CHECK( 2 );
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format = OTL_NEXT_USHORT( p );
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switch ( format )
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{
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case 1:
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{
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OTL_UInt coverage, count;
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OTL_CHECK( 4 );
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coverage = OTL_NEXT_USHORT( p );
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count = OTL_NEXT_USHORT( p );
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otl_coverage_validate( table + coverage, valid );
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OTL_CHECK( 2*count );
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for ( ; count > 0; count-- )
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otl_alternate_set_validate( table + OTL_NEXT_USHORT( p ), valid );
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}
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break;
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default:
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OTL_INVALID_DATA;
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}
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}
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/************************************************************************/
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/************************************************************************/
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/***** *****/
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/***** GSUB LOOKUP TYPE 4 *****/
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/***** *****/
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/************************************************************************/
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/************************************************************************/
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static void
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otl_ligature_validate( OTL_Bytes table,
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OTL_Validator valid )
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{
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OTL_UInt glyph_id, count;
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OTL_CHECK( 4 );
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glyph_id = OTL_NEXT_USHORT( p );
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count = OTL_NEXT_USHORT( p );
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if ( count == 0 )
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OTL_INVALID_DATA;
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OTL_CHECK( 2*(count-1) );
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/* XXX: check glyph indices */
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}
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static void
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otl_ligature_set_validate( OTL_Bytes table,
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OTL_Validator valid )
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{
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OTL_Bytes p = table;
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OTL_UInt count;
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OTL_CHECK( 2 );
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count = OTL_NEXT_USHORT( p );
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OTL_CHECK( 2*count );
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for ( ; count > 0; count-- )
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otl_ligature_validate( table + OTL_NEXT_USHORT( p ), valid );
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}
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static void
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otl_gsub_lookup4_validate( OTL_Bytes table,
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OTL_Validator valid )
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{
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OTL_Bytes p = table;
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OTL_UInt format, coverage;
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OTL_CHECK( 2 );
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format = OTL_NEXT_USHORT( p );
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switch ( format )
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{
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case 1:
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{
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OTL_UInt coverage, count;
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OTL_CHECK( 4 );
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coverage = OTL_NEXT_USHORT( p );
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count = OTL_NEXT_USHORT( p );
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otl_coverage_validate( table + coverage, valid );
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OTL_CHECK( 2*count );
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for ( ; count > 0; count-- )
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otl_ligature_set_validate( table + OTL_NEXT_USHORT( p ), valid );
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}
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break;
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default:
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OTL_INVALID_DATA;
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}
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}
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/************************************************************************/
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/************************************************************************/
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/***** *****/
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/***** GSUB LOOKUP TYPE 5 *****/
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/***** *****/
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/************************************************************************/
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/************************************************************************/
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static void
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otl_sub_rule_validate( OTL_Bytes table,
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OTL_Validator valid )
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{
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OTL_Bytes p = table;
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OTL_UInt glyph_count, subst_count;
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OTL_CHECK( 4 );
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glyph_count = OTL_NEXT_USHORT( p );
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subst_count = OTL_NEXT_USHORT( p );
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if ( glyph_count == 0 )
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OTL_INVALID_DATA;
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OTL_CHECK( (glyph_count-1)*2 + substcount*4 );
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/* XXX: check glyph indices and subst lookups */
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}
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static void
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otl_sub_rule_set_validate( OTL_Bytes table,
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OTL_Validator valid )
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{
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OTL_Bytes p = table;
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OTL_UInt count;
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OTL_CHECK( 2 );
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count = OTL_NEXT_USHORT( p );
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OTL_CHECK( 2*count );
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for ( ; count > 0; count-- )
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otl_sub_rule_validate( table + OTL_NEXT_USHORT( p ), valid );
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}
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static void
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otl_sub_class_rule_validate( OTL_Bytes table,
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OTL_Validator valid )
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{
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OTL_UInt glyph_count, subst_count;
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OTL_CHECK( 4 );
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glyph_count = OTL_NEXT_USHORT( p );
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subst_count = OTL_NEXT_USHORT( p );
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if ( glyph_count == 0 )
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OTL_INVALID_DATA;
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OTL_CHECK( (glyph_count-1)*2 + substcount*4 );
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/* XXX: check glyph indices and subst lookups */
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}
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static void
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otl_sub_class_rule_set_validate( OTL_Bytes table,
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OTL_Validator valid )
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{
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OTL_Bytes p = table;
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OTL_UInt count;
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OTL_CHECK( 2 );
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count = OTL_NEXT_USHORT( p );
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OTL_CHECK( 2*count );
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for ( ; count > 0; count-- )
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otl_sub_class_rule_validate( table + OTL_NEXT_USHORT( p ), valid );
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}
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static void
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otl_gsub_lookup5_validate( OTL_Bytes table,
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OTL_Validator valid )
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{
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OTL_Bytes p = table;
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OTL_UInt format, coverage;
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OTL_CHECK( 2 );
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format = OTL_NEXT_USHORT( p );
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switch ( format )
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{
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case 1:
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{
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OTL_UInt coverage, count;
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OTL_CHECK( 4 );
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coverage = OTL_NEXT_USHORT( p );
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count = OTL_NEXT_USHORT( p );
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otl_coverage_validate( table + coverage, valid );
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OTL_CHECK( 2*count );
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for ( ; count > 0; count-- )
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otl_sub_rule_set_validate( table + coverage, valid );
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}
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break;
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case 2:
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{
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OTL_UInt coverage, class_def, count;
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OTL_CHECK( 6 );
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coverage = OTL_NEXT_USHORT( p );
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class_def = OTL_NEXT_USHORT( p );
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count = OTL_NEXT_USHORT( p );
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otl_coverage_validate ( table + coverage, valid );
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otl_class_definition_validate( table + class_def, valid );
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OTL_CHECK( 2*count );
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for ( ; count > 0; count-- )
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otl_sub_class_rule_set_validate( table + coveragen valid );
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}
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break;
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case 3:
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{
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OTL_UInt glyph_count, subst_count, count;
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OTL_CHECK( 4 );
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glyph_count = OTL_NEXT_USHORT( p );
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subst_count = OTL_NEXT_USHORT( p );
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OTL_CHECK( 2*glyph_count + 4*subst_count );
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for ( count = glyph_count; count > 0; count-- )
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otl_coverage_validate( table + OTL_NEXT_USHORT( p ), valid );
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}
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break;
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default:
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OTL_INVALID_DATA;
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}
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}
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/************************************************************************/
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/************************************************************************/
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/***** *****/
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/***** GSUB LOOKUP TYPE 6 *****/
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/***** *****/
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/************************************************************************/
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/************************************************************************/
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static void
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otl_chain_sub_rule_validate( OTL_Bytes table,
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OTL_Validator valid )
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{
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OTL_Bytes p = table;
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OTL_UInt back_count, input_count, ahead_count, subst_count, count;
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OTL_CHECK( 2 );
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back_count = OTL_NEXT_USHORT( p );
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OTL_CHECK( 2*back_count+2 );
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p += 2*back_count;
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input_count = OTL_NEXT_USHORT( p );
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if ( input_count == 0 )
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OTL_INVALID_DATA;
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OTL_CHECK( 2*input_count );
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p += 2*(input_count-1);
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ahead_count = OTL_NEXT_USHORT( p );
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OTL_CHECK( 2*ahead_count + 2 );
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p += 2*ahead_count;
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count = OTL_NEXT_USHORT( p );
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OTL_CHECK( 4*count );
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/* XXX: check glyph indices and subst lookups */
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}
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static void
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|
|
otl_chain_sub_rule_set_validate( OTL_Bytes table,
|
||
|
|
OTL_Validator valid )
|
||
|
|
{
|
||
|
|
OTL_Bytes p = table;
|
||
|
|
OTL_UInt count;
|
||
|
|
|
||
|
|
OTL_CHECK( 2 );
|
||
|
|
count = OTL_NEXT_USHORT( p );
|
||
|
|
|
||
|
|
OTL_CHECK( 2*count );
|
||
|
|
for ( ; count > 0; count-- )
|
||
|
|
otl_chain_sub_rule_validate( table + OTL_NEXT_USHORT( p ), valid );
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
static void
|
||
|
|
otl_chain_sub_class_rule_validate( OTL_Bytes table,
|
||
|
|
OTL_Validator valid )
|
||
|
|
{
|
||
|
|
OTL_Bytes p = table;
|
||
|
|
OTL_UInt back_count, input_count, ahead_count, subst_count, count;
|
||
|
|
|
||
|
|
OTL_CHECK( 2 );
|
||
|
|
back_count = OTL_NEXT_USHORT( p );
|
||
|
|
|
||
|
|
OTL_CHECK( 2*back_count+2 );
|
||
|
|
p += 2*back_count;
|
||
|
|
|
||
|
|
input_count = OTL_NEXT_USHORT( p );
|
||
|
|
if ( input_count == 0 )
|
||
|
|
OTL_INVALID_DATA;
|
||
|
|
|
||
|
|
OTL_CHECK( 2*input_count );
|
||
|
|
p += 2*(input_count-1);
|
||
|
|
|
||
|
|
ahead_count = OTL_NEXT_USHORT( p );
|
||
|
|
OTL_CHECK( 2*ahead_count + 2 );
|
||
|
|
p += 2*ahead_count;
|
||
|
|
|
||
|
|
count = OTL_NEXT_USHORT( p );
|
||
|
|
OTL_CHECK( 4*count );
|
||
|
|
|
||
|
|
/* XXX: check class indices and subst lookups */
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
static void
|
||
|
|
otl_chain_sub_class_set_validate( OTL_Bytes table,
|
||
|
|
OTL_Validator valid )
|
||
|
|
{
|
||
|
|
OTL_Bytes p = table;
|
||
|
|
OTL_UInt count;
|
||
|
|
|
||
|
|
OTL_CHECK( 2 );
|
||
|
|
count = OTL_NEXT_USHORT( p );
|
||
|
|
|
||
|
|
OTL_CHECK( 2*count );
|
||
|
|
for ( ; count > 0; count-- )
|
||
|
|
otl_chain_sub_rule_validate( table + OTL_NEXT_USHORT( p ), valid );
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
static void
|
||
|
|
otl_gsub_lookup6_validate( OTL_Bytes table,
|
||
|
|
OTL_Validator valid )
|
||
|
|
{
|
||
|
|
OTL_Bytes p = table;
|
||
|
|
OTL_UInt format, coverage;
|
||
|
|
|
||
|
|
OTL_CHECK( 2 );
|
||
|
|
format = OTL_NEXT_USHORT( p );
|
||
|
|
switch ( format )
|
||
|
|
{
|
||
|
|
case 1:
|
||
|
|
{
|
||
|
|
OTL_UInt coverage, count;
|
||
|
|
|
||
|
|
OTL_CHECK( 4 );
|
||
|
|
coverage = OTL_NEXT_USHORT( p );
|
||
|
|
count = OTL_NEXT_USHORT( p );
|
||
|
|
|
||
|
|
otl_coverage_validate( table + coverage, valid );
|
||
|
|
|
||
|
|
OTL_CHECK( 2*count );
|
||
|
|
for ( ; count > 0; count-- )
|
||
|
|
otl_chain_sub_rule_set_validate( table + coverage, valid );
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
case 2:
|
||
|
|
{
|
||
|
|
OTL_UInt coverage, back_class, input_class, ahead_class, count;
|
||
|
|
|
||
|
|
OTL_CHECK( 10 );
|
||
|
|
coverage = OTL_NEXT_USHORT( p );
|
||
|
|
back_class = OTL_NEXT_USHORT( p );
|
||
|
|
input_class = OTL_NEXT_USHORT( p );
|
||
|
|
ahead_class = OTL_NEXT_USHORT( p );
|
||
|
|
count = OTL_NEXT_USHORT( p );
|
||
|
|
|
||
|
|
otl_coverage_validate( table + coverage, valid );
|
||
|
|
|
||
|
|
otl_class_definition_validate( table + back_class, valid );
|
||
|
|
otl_class_definition_validate( table + input_class, valid );
|
||
|
|
otl_class_definition_validate( table + ahead_class, valid );
|
||
|
|
|
||
|
|
OTL_CHECK( 2*count );
|
||
|
|
for ( ; count > 0; count-- )
|
||
|
|
otl_chain_sub_class_set( table + OTL_NEXT_USHORT( p ), valid );
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
case 3:
|
||
|
|
{
|
||
|
|
OTL_UInt back_count, input_count, ahead_count, subst_count, count;
|
||
|
|
|
||
|
|
OTL_CHECK( 2 );
|
||
|
|
back_count = OTL_NEXT_USHORT( p );
|
||
|
|
|
||
|
|
OTL_CHECK( 2*back_count+2 );
|
||
|
|
for ( count = back_count; count > 0; count-- )
|
||
|
|
otl_coverage_validate( table + OTL_NEXT_USHORT( p ), valid );
|
||
|
|
|
||
|
|
input_count = OTL_NEXT_USHORT( p );
|
||
|
|
|
||
|
|
OTL_CHECK( 2*input_count+2 );
|
||
|
|
for ( count = input_count; count > 0; count-- )
|
||
|
|
otl_coverage_validate( table + OTL_NEXT_USHORT( p ), valid );
|
||
|
|
|
||
|
|
ahead_count = OTL_NEXT_USHORT( p );
|
||
|
|
|
||
|
|
OTL_CHECK( 2*ahead_count+2 );
|
||
|
|
for ( count = ahead_count; count > 0; count-- )
|
||
|
|
otl_coverage_validate( table + OTL_NEXT_USHORT( p ), valid );
|
||
|
|
|
||
|
|
subst_count = OTL_NEXT_USHORT( p );
|
||
|
|
OTL_CHECK( subst_count*4 );
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
default:
|
||
|
|
OTL_INVALID_DATA;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/************************************************************************/
|
||
|
|
/************************************************************************/
|
||
|
|
/***** *****/
|
||
|
|
/***** GSUB LOOKUP TYPE 6 *****/
|
||
|
|
/***** *****/
|
||
|
|
/************************************************************************/
|
||
|
|
/************************************************************************/
|
||
|
|
|
||
|
|
static void
|
||
|
|
otl_gsub_lookup7_validate( OTL_Bytes table,
|
||
|
|
OTL_Validator valid )
|
||
|
|
{
|
||
|
|
OTL_Bytes p = table;
|
||
|
|
OTL_UInt format, coverage;
|
||
|
|
|
||
|
|
OTL_CHECK( 2 );
|
||
|
|
format = OTL_NEXT_USHORT( p );
|
||
|
|
switch ( format )
|
||
|
|
{
|
||
|
|
case 1:
|
||
|
|
{
|
||
|
|
OTL_UInt lookup_type, lookup_offset;
|
||
|
|
OTL_ValidateFunc validate;
|
||
|
|
|
||
|
|
OTL_CHECK( 6 );
|
||
|
|
lookup_type = OTL_NEXT_USHORT( p );
|
||
|
|
lookup_offset = OTL_NEXT_ULONG( p );
|
||
|
|
|
||
|
|
if ( lookup_type == 0 || lookup_type >= 7 )
|
||
|
|
OTL_INVALID_DATA;
|
||
|
|
|
||
|
|
validate = otl_gsub_validate_funcs[ lookup_type-1 ];
|
||
|
|
validate( table + lookup_offset, valid );
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
default:
|
||
|
|
OTL_INVALID_DATA;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
static const OTL_ValidateFunc otl_gsub_validate_funcs[ 7 ] =
|
||
|
|
{
|
||
|
|
otl_gsub_lookup1_validate,
|
||
|
|
otl_gsub_lookup2_validate,
|
||
|
|
otl_gsub_lookup3_validate,
|
||
|
|
otl_gsub_lookup4_validate,
|
||
|
|
otl_gsub_lookup5_validate,
|
||
|
|
otl_gsub_lookup6_validate
|
||
|
|
};
|
||
|
|
|
||
|
|
/************************************************************************/
|
||
|
|
/************************************************************************/
|
||
|
|
/***** *****/
|
||
|
|
/***** GSUB TABLE *****/
|
||
|
|
/***** *****/
|
||
|
|
/************************************************************************/
|
||
|
|
/************************************************************************/
|
||
|
|
|
||
|
|
|
||
|
|
OTL_LOCALDEF( void )
|
||
|
|
otl_gsub_validate( OTL_Bytes table,
|
||
|
|
OTL_Validator valid )
|
||
|
|
{
|
||
|
|
OTL_Bytes p = table;
|
||
|
|
OTL_UInt scripts, features, lookups;
|
||
|
|
|
||
|
|
OTL_CHECK( 10 );
|
||
|
|
|
||
|
|
if ( OTL_NEXT_USHORT( p ) != 0x10000UL )
|
||
|
|
OTL_INVALID_DATA;
|
||
|
|
|
||
|
|
scripts = OTL_NEXT_USHORT( p );
|
||
|
|
features = OTL_NEXT_USHORT( p );
|
||
|
|
lookups = OTL_NEXT_USHORT( p );
|
||
|
|
|
||
|
|
otl_script_list_validate ( table + scripts, valid );
|
||
|
|
otl_feature_list_validate( table + features, valid );
|
||
|
|
|
||
|
|
otl_lookup_list_validate( table + lookups, 7, otl_gsub_validate_funcs,
|
||
|
|
valid );
|
||
|
|
}
|