get_labels

# File lib/resolv.rb, line 1631
        def get_labels
          prev_index = @index
          save_index = nil
          d = []
          while true
            raise DecodeError.new("limit exceeded") if @limit <= @index
            case @data[@index].ord
            when 0
              @index += 1
              if save_index
                @index = save_index
              end
              return d
            when 192..255
              idx = self.get_unpack('n')[0] & 0x3fff
              if prev_index <= idx
                raise DecodeError.new("non-backward name pointer")
              end
              prev_index = idx
              if !save_index
                save_index = @index
              end
              @index = idx
            else
              d << self.get_label
            end
          end
        end