redef fun raw_read_byte
	do
		if cursor >= bytes.length then return -1

		var c = bytes[cursor]
		cursor += 1
		return c.to_i
	end

	redef fun raw_read_byte do return stream_in.read_byte

	redef fun raw_read_byte do
		return origin.read_byte
	end

	redef fun raw_read_byte
	do
		var nb = _file.as(not null).io_read(write_buffer, 1)
		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
		if nb == 0 then return -1
		return write_buffer[0].to_i
	end

	redef fun raw_read_byte do
		var rd = native.read(write_buffer, 1)
		if rd < 1 then return -1
		return write_buffer[0].to_i
	end

	redef fun raw_read_byte do
		while not closed and frame_cursor >= frame_length do
			read_frame_info
		end
		if closed then return -1
		var b = origin.read_byte
		if b >= 0 then
			frame_cursor += 1
		end
		return b
	end