code: def _parse_qcc_segment(cls, fptr):
          
          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)
docs: Parse the QCC segment.
  
          Parameters
          ----------
          fptr : file object
              The file to parse.
  
          Returns
          -------
          QCCSegment
              The current QCC segment.