# Reads up to `max` bytes from source and stores them in `bytes`
	fun read_bytes_to_cstring(bytes: CString, max: Int): Int do
		var llen = lookahead_length
		if llen == 0 then return raw_read_bytes(bytes, max)
		var rd = max.min(llen)
		var lk = lookahead
		lk.copy_to(bytes, rd, 0, 0)
		if rd < llen then
			lk.lshift(rd, llen - rd, rd)
			lookahead_length -= rd
		else
			lookahead_length = 0
		end
		return rd + raw_read_bytes(bytes.fast_cstring(rd), max - rd)
	end