let packet_type = try_read_io!(input.read_u8());
if ![0x00, 0xFF, 0x0A, 0x0B].iter().any(|p| *p == packet_type) {
consume(input, data_size as uint - 1);
let packet_type = try_read_io!(input.read_u8());
if ![0x00, 0xFF, 0x0A, 0x0B].iter().any(|p| *p == packet_type) {
consume(input, data_size as uint - 1);