pub fn lz_copy(buf: &mut [u8], dst_pos: usize, offset: usize, len: usize) {
if dst_pos < offset {
panic!("Copy offset is before buffer start.");
pub fn lz_copy(buf: &mut [u8], dst_pos: usize, offset: usize, len: usize) {
if dst_pos < offset {
panic!("Copy offset is before buffer start.");