ref: 1018d7a7091fd5e0433f501a3474cdc3fec322cc
dir: /libfreetype/otlbase.c/
#include "otlbase.h" #include "otlcommn.h" static void otl_base_coord_validate( OTL_Bytes table, OTL_Validator valid ) { OTL_Bytes p = table; OTL_UInt format; OTL_CHECK( 4 ); format = OTL_NEXT_USHORT( p ); p += 2; switch ( format ) { case 1: break; case 2: OTL_CHECK( 4 ); break; case 3: OTL_CHECK( 2 ); otl_device_table_validate( table + OTL_PEEK_USHORT( p ) ); break; default: OTL_INVALID_DATA; } } static void otl_base_tag_list_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*4 ); } static void otl_base_values_validate( OTL_Bytes table, OTL_Validator valid ) { OTL_Bytes p = table; OTL_UInt count; OTL_CHECK( 4 ); p += 2; /* skip default index */ count = OTL_NEXT_USHORT( p ); OTL_CHECK( count*2 ); for ( ; count > 0; count-- ) otl_base_coord_validate( table + OTL_NEXT_USHORT( p ), valid ); } static void otl_base_minmax_validate( OTL_Bytes table, OTL_Validator valid ) { OTL_Bytes p = table; OTL_UInt min_coord, max_coord, count; OTL_CHECK(6); min_coord = OTL_NEXT_USHORT( p ); max_coord = OTL_NEXT_USHORT( p ); count = OTL_NEXT_USHORT( p ); if ( min_coord ) otl_base_coord_validate( table + min_coord, valid ); if ( max_coord ) otl_base_coord_validate( table + max_coord, valid ); OTL_CHECK( count*8 ); for ( ; count > 0; count-- ) { p += 4; /* ignore tag */ min_coord = OTL_NEXT_USHORT( p ); max_coord = OTL_NEXT_USHORT( p ); if ( min_coord ) otl_base_coord_validate( table + min_coord, valid ); if ( max_coord ) otl_base_coord_validate( table + max_coord, valid ); } } static void otl_base_script_validate( OTL_Bytes table, OTL_Validator valid ) { OTL_Bytes p = table; OTL_UInt values, default_minmax; OTL_CHECK(6); values = OTL_NEXT_USHORT( p ); default_minmax = OTL_NEXT_USHORT( p ); count = OTL_NEXT_USHORT( p ); if ( values ) otl_base_values_validate( table + values, valid ); if ( default_minmax ) otl_base_minmax_validate( table + default_minmax, valid ); OTL_CHECK( count*6 ); for ( ; count > 0; count-- ) { p += 4; /* ignore tag */ otl_base_minmax_validate( table + OTL_NEXT_USHORT( p ), valid ); } } static void otl_base_script_list_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*6); for ( ; count > 0; count-- ) { p += 4; /* ignore script tag */ otl_base_script_validate( table + OTL_NEXT_USHORT( p ) ); } } static void otl_axis_table_validate( OTL_Bytes table, OTL_Validator valid ) { OTL_Bytes p = table; OTL_UInt tags; OTL_CHECK(4); tags = OTL_NEXT_USHORT( p ); if ( tags ) otl_base_tag_list_validate ( table + tags ); otl_base_script_list_validate( table + OTL_NEXT_USHORT( p ) ); } OTL_LOCALDEF( void ) otl_base_validate( OTL_Bytes table, OTL_Validator valid ) { OTL_Bytes p = table; OTL_CHECK(6); if ( OTL_NEXT_ULONG( p ) != 0x10000UL ) OTL_INVALID_DATA; otl_axis_table_validate( table + OTL_NEXT_USHORT( p ) ); otl_axis_table_validate( table + OTL_NEXT_USHORT( p ) ); }