private void HandleSegmentDataLength(SegmentHeader segmentHeader)
        {
            short[] buf = new short[4];
            reader.Readbyte(buf);

            int dateLength = BinaryOperation.GetInt32(buf);

            segmentHeader.SetDataLength(dateLength);

            if (JBIG2StreamDecoder.debug)
            {
                Console.WriteLine("dateLength = " + dateLength);
            }
        }