class Gem::Resolv::DNS::Message::MessageDecoder

def get_string
  raise DecodeError.new("limit exceeded") if @limit <= @index
  len = @data.getbyte(@index)
  raise DecodeError.new("limit exceeded") if @limit < @index + 1 + len
  d = @data.byteslice(@index + 1, len)
  @index += 1 + len
  return d
end