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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _parse_qcc_segment(cls, fptr):
 """Parse the QCC segment. Parameters fptr : file object The file to parse. Returns ------- QCCSegment The current QCC segment. """

        offset = fptr.tell() - 2

        read_buffer = fptr.read(2)
        length, = struct.unpack('>H', read_buffer)

        read_buffer = fptr.read(length - 2)
        fmt = '>HB' if cls._csiz > 256 else '>BB'
        mantissa_exponent_offset = 3 if cls._csiz > 256 else 2
        cqcc, sqcc = struct.unpack_from(fmt, read_buffer)
        if cqcc >= cls._csiz:
            msg = ("Invalid QCC component number ({invalid_comp_no}), "
                   "the actual number of components is only {valid_comp_no}.")
            msg = msg.format(invalid_comp_no=cqcc, valid_comp_no=cls._csiz)
            warnings.warn(msg, UserWarning)

        spqcc = read_buffer[mantissa_exponent_offset:]

        return QCCsegment(cqcc, sqcc, spqcc, length, offset)