code: private void logColumnData(int startIndex, int length)
     {
        if (m_log != null)
        {
           m_log.println();
           m_log.println(FastTrackUtility.hexdump(m_buffer, startIndex, length, true, 16, ""));
           m_log.println();
           m_log.flush();
        }
     }
docs: Log the data for a single column.
  
  @param startIndex offset into buffer
  @param length length