def _parse_cme_segment(self, fptr):
offset = fptr.tell() - <NUM_LIT:2><EOL>read_buffer = fptr.read(<NUM_LIT:4>)<EOL>data = struct.unpack('<STR_LIT>', read_buffer)<EOL>length = data[<NUM_LIT:0>]<EOL>rcme = data[<NUM_LIT:1>]<EOL>ccme = fptr.read(length - <NUM_LIT:4>)<EOL>return CMEsegment(rcme, ccme, length, offset)<EOL>
Parse the CME marker segment.

        Parameters
        ----------
        fptr : file
            Open file object.

        Returns
        -------
        CMESegment
            The current CME segment.