def _parse_unrecognized_segment(self, fptr):
        """Looks like a valid marker, but not sure from reading the specs.
        """
        msg = ("Unrecognized codestream marker 0x{marker_id:x} encountered at "
               "byte offset {offset}.")
        msg = msg.format(marker_id=self._marker_id, offset=fptr.tell())
        warnings.warn(msg, UserWarning)
        cpos = fptr.tell()
        read_buffer = fptr.read(2)
        next_item, = struct.unpack('>H', read_buffer)
        fptr.seek(cpos)
        if ((next_item & 0xff00) >> 8) == 255:
                # No segment associated with this marker, so reset
                # to two bytes after it.
            segment = Segment(id='0x{0:x}'.format(self._marker_id),
                              offset=self._offset, length=0)
        else:
            segment = self._parse_reserved_segment(fptr)
        return segment
Looks like a valid marker, but not sure from reading the specs.