ref: c8b187f9db503465460d8bafa2d7a758bbcf59ca
dir: /libfreetype/otljstf.c/
#include "otljstf.h" #include "otlcommn.h" #include "otlgpos.h" static void otl_jstf_extender_validate( OTL_Bytes table, OTL_Validator valid ) { OTL_Bytes p = table; OTL_UInt count; OTL_CHECK( 2 ); count = OTL_NEXT_USHORT( p ); OTL_CHECK( count*2 ); } static void otl_jstf_gsub_mods_validate( OTL_Bytes table, OTL_Validator valid ) { OTL_Bytes p = table; OTL_UInt count; OTL_CHECK( 2 ); count = OTL_NEXT_USHORT( p ); OTL_CHECK( count*2 ); /* XXX: check GSUB lookup indices */ } static void otl_jstf_gpos_mods_validate( OTL_Bytes table, OTL_Validator valid ) { OTL_Bytes p = table; OTL_UInt count; OTL_CHECK( 2 ); count = OTL_NEXT_USHORT( p ); OTL_CHECK( count*2 ); /* XXX: check GPOS lookup indices */ } static void otl_jstf_max_validate( OTL_Bytes table, OTL_Validator valid ) { OTL_Bytes p = table; OTL_UInt count; OTL_CHECK( 2 ); count = OTL_NEXT_USHORT( p ); OTL_CHECK( count*2 ); for ( ; count > 0; count-- ) otl_gpos_subtable_check( table + OTL_NEXT_USHORT( p ), valid ); } static void otl_jstf_priority_validate( OTL_Bytes table, OTL_Validator valid ) { OTL_Bytes p = table; OTL_UInt offset; OTL_CHECK( 20 ); /* shrinkage GSUB enable/disable */ val = OTL_NEXT_USHORT( p ); if ( val ) otl_jstf_gsub_mods_validate( table + val, valid ); val = OTL_NEXT_USHORT( p ); if ( val ) otl_jstf_gsub_mods_validate( table + val, valid ); /* shrinkage GPOS enable/disable */ val = OTL_NEXT_USHORT( p ); if ( val ) otl_jstf_gpos_mods_validate( table + val, valid ); val = OTL_NEXT_USHORT( p ); if ( val ) otl_jstf_gpos_mods_validate( table + val, valid ); /* shrinkage JSTF max */ val = OTL_NEXT_USHORT( p ); if ( val ) otl_jstf_max_validate( table + val, valid ); /* extension GSUB enable/disable */ val = OTL_NEXT_USHORT( p ); if ( val ) otl_jstf_gsub_mods_validate( table + val, valid ); val = OTL_NEXT_USHORT( p ); if ( val ) otl_jstf_gsub_mods_validate( table + val, valid ); /* extension GPOS enable/disable */ val = OTL_NEXT_USHORT( p ); if ( val ) otl_jstf_gpos_mods_validate( table + val, valid ); val = OTL_NEXT_USHORT( p ); if ( val ) otl_jstf_gpos_mods_validate( table + val, valid ); /* extension JSTF max */ val = OTL_NEXT_USHORT( p ); if ( val ) otl_jstf_max_validate( table + val, valid ); } static void otl_jstf_lang_validate( OTL_Bytes table, OTL_Validator valid ) { OTL_Bytes p = table; OTL_UInt count; OTL_CHECK( 2 ); count = OTL_NEXT_USHORT( p ); OTL_CHECK( count*2 ); for ( ; count > 0; count-- ) otl_jstf_priority_validate( table + OTL_NEXT_USHORT( p ), valid ); } static void otl_jstf_script_validate( OTL_Bytes table, OTL_Validator valid ) { OTL_Bytes p = table; OTL_UInt count, extender, default_lang; OTL_CHECK( 6 ); extender = OTL_NEXT_USHORT( p ); default_lang = OTL_NEXT_USHORT( p ); count = OTL_NEXT_USHORT( p ); if ( extender ) otl_jstf_extender_validate( table + extender, valid ); if ( default_lang ) otl_jstf_lang_validate( table + default_lang, valid ); OTL_CHECK( 6*count ); for ( ; count > 0; count-- ) { p += 4; /* ignore tag */ otl_jstf_lang_validate( table + OTL_NEXT_USHORT( p ), valid ); } } OTL_LOCALDEF( void ) otl_jstf_validate( OTL_Bytes table, OTL_Validator valid ) { OTL_Bytes p = table; OTL_UInt count; OTL_CHECK( 4 ); if ( OTL_NEXT_ULONG( p ) != 0x10000UL ) OTL_INVALID_DATA; count = OTL_NEXT_USHORT( p ); OTL_CHECK( count*6 ); for ( ; count > 0; count++ ) { p += 4; /* ignore tag */ otl_jstf_script_validate( table + OTL_NEXT_USHORT( p ), valid ); } }