redef fun raw_read_bytes(ns, max) do
		if cursor >= bytes.length then return 0

		var copy = max.min(bytes.length - cursor)
		bytes.items.copy_to(ns, copy, cursor, 0)
		cursor += copy
		return copy
	end

	redef fun raw_read_bytes(ns, len) do
		return origin.read_bytes_to_cstring(ns, len)
	end

	redef fun raw_read_bytes(cstr, max)
	do
		var nb = _file.as(not null).io_read(cstr, max)
		if last_error == null and _file.as(not null).ferror then
			last_error = new IOError("Cannot read `{path.as(not null)}`: {sys.errno.strerror}")
		end
		return nb
	end

	redef fun raw_read_bytes(ns, max) do
		var rd = native.read(ns, max)
		print "Read {rd} bytes"
		if rd < 0 then return -1
		return rd
	end

	redef fun raw_read_bytes(ns, len) do
		while not closed and frame_cursor >= frame_length do
			read_frame_info
		end
		if closed then return -1
		var available = frame_length - frame_cursor
		var to_rd = len.min(available)
		var rd = origin.read_bytes_to_cstring(ns, to_rd)
		if rd < 0 then
			close
			return 0
		end
		if has_mask then
			ns.xor(mask, rd, 4, mask_offset)
			mask_offset = rd % 4
		end
		frame_cursor += rd
		return rd
	end