code: public void writeNull()
          throws IOException
      {
          int offset = _offset;
          byte[] buffer = _buffer;
  
          if (SIZE <= offset + 16) {
              flushBuffer();
              offset = _offset;
          }
  
          buffer[offset++] = 'N';
  
          _offset = offset;
      }
docs: Writes a null value to the stream.
  The null will be written with the following syntax
  
  <code><pre>
  N
  </pre></code>
  
  @param value the string value to write.