ref: 4d12d89dcd96bf2a7512b47d1fa3e04d52273ce2
dir: /src/otlayout/otlgsub.c/
#include "otlgsub.h" #include "otlcommn.h" /************************************************************************/ /************************************************************************/ /***** *****/ /***** GSUB LOOKUP TYPE 1 *****/ /***** *****/ /************************************************************************/ /************************************************************************/ static void otl_gsub_lookup1_validate( OTL_Bytes table, OTL_Validator valid ) { OTL_Bytes p = table; OTL_UInt format; OTL_CHECK( 2 ); format = OTL_NEXT_USHORT( p ); switch ( format ) { case 1: { OTL_UInt coverage; OTL_CHECK( 4 ); coverage = OTL_NEXT_USHORT( p ); otl_coverage_validate( table + coverage, valid ); } break; case 2: { 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 ); } break; default: OTL_INVALID_DATA; } } /************************************************************************/ /************************************************************************/ /***** *****/ /***** GSUB LOOKUP TYPE 2 *****/ /***** *****/ /************************************************************************/ /************************************************************************/ static void otl_seq_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 ); /* check glyph indices */ } static void otl_gsub_lookup2_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, seq_count; OTL_CHECK( 4 ); coverage = OTL_NEXT_USHORT( p ); seq_count = OTL_NEXT_USHORT( p ); otl_coverage_validate( table + coverage, valid ); OTL_CHECK( seq_count*2 ); for ( ; seq_count > 0; seq_count-- ) otl_seq_validate( table + OTL_NEXT_USHORT( p ), valid ); } break; default: OTL_INVALID_DATA; } } /************************************************************************/ /************************************************************************/ /***** *****/ /***** GSUB LOOKUP TYPE 3 *****/ /***** *****/ /************************************************************************/ /************************************************************************/ static void otl_alternate_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 ); /* XXX: check glyph indices */ } static void otl_gsub_lookup3_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_alternate_set_validate( table + OTL_NEXT_USHORT( p ), valid ); } break; default: OTL_INVALID_DATA; } } /************************************************************************/ /************************************************************************/ /***** *****/ /***** GSUB LOOKUP TYPE 4 *****/ /***** *****/ /************************************************************************/ /************************************************************************/ static void otl_ligature_validate( OTL_Bytes table, OTL_Validator valid ) { OTL_UInt glyph_id, count; OTL_CHECK( 4 ); glyph_id = OTL_NEXT_USHORT( p ); count = OTL_NEXT_USHORT( p ); if ( count == 0 ) OTL_INVALID_DATA; OTL_CHECK( 2*(count-1) ); /* XXX: check glyph indices */ } static void otl_ligature_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_ligature_validate( table + OTL_NEXT_USHORT( p ), valid ); } static void otl_gsub_lookup4_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_ligature_set_validate( table + OTL_NEXT_USHORT( p ), valid ); } break; default: OTL_INVALID_DATA; } } /************************************************************************/ /************************************************************************/ /***** *****/ /***** GSUB LOOKUP TYPE 5 *****/ /***** *****/ /************************************************************************/ /************************************************************************/ static void otl_sub_rule_validate( OTL_Bytes table, OTL_Validator valid ) { OTL_Bytes p = table; OTL_UInt glyph_count, subst_count; OTL_CHECK( 4 ); glyph_count = OTL_NEXT_USHORT( p ); subst_count = OTL_NEXT_USHORT( p ); if ( glyph_count == 0 ) OTL_INVALID_DATA; OTL_CHECK( (glyph_count-1)*2 + substcount*4 ); /* XXX: check glyph indices and subst lookups */ } static void otl_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_sub_rule_validate( table + OTL_NEXT_USHORT( p ), valid ); } static void otl_sub_class_rule_validate( OTL_Bytes table, OTL_Validator valid ) { OTL_UInt glyph_count, subst_count; OTL_CHECK( 4 ); glyph_count = OTL_NEXT_USHORT( p ); subst_count = OTL_NEXT_USHORT( p ); if ( glyph_count == 0 ) OTL_INVALID_DATA; OTL_CHECK( (glyph_count-1)*2 + substcount*4 ); /* XXX: check glyph indices and subst lookups */ } static void otl_sub_class_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_sub_class_rule_validate( table + OTL_NEXT_USHORT( p ), valid ); } static void otl_gsub_lookup5_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_sub_rule_set_validate( table + coverage, valid ); } break; case 2: { OTL_UInt coverage, class_def, count; OTL_CHECK( 6 ); coverage = OTL_NEXT_USHORT( p ); class_def = OTL_NEXT_USHORT( p ); count = OTL_NEXT_USHORT( p ); otl_coverage_validate ( table + coverage, valid ); otl_class_definition_validate( table + class_def, valid ); OTL_CHECK( 2*count ); for ( ; count > 0; count-- ) otl_sub_class_rule_set_validate( table + coveragen valid ); } break; case 3: { OTL_UInt glyph_count, subst_count, count; OTL_CHECK( 4 ); glyph_count = OTL_NEXT_USHORT( p ); subst_count = OTL_NEXT_USHORT( p ); OTL_CHECK( 2*glyph_count + 4*subst_count ); for ( count = glyph_count; count > 0; count-- ) otl_coverage_validate( table + OTL_NEXT_USHORT( p ), valid ); } break; default: OTL_INVALID_DATA; } } /************************************************************************/ /************************************************************************/ /***** *****/ /***** GSUB LOOKUP TYPE 6 *****/ /***** *****/ /************************************************************************/ /************************************************************************/ static void otl_chain_sub_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 glyph indices and subst lookups */ } static void 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 ); }