code: def _parse_reserved_segment(self, fptr):
          
          offset = fptr.tell() - 2
  
          read_buffer = fptr.read(2)
          length, = struct.unpack('>H', read_buffer)
          if length > 0:
              data = fptr.read(length - 2)
          else:
              data = None
  
          segment = Segment(marker_id='0x{0:x}'.format(self._marker_id),
                            offset=offset, length=length, data=data)
          return segment
docs: Parse valid marker segment, segment description is unknown.
  
          Parameters
          ----------
          fptr : file object
              The file to parse.
  
          Returns
          -------
          Segment
              The current segment.