@classmethod<EOL><INDENT>def parse(cls, fptr, offset, length):<DEDENT>
num_bytes = offset + length - fptr.tell()<EOL>raw_data = fptr.read(num_bytes)<EOL>num_associations = int(len(raw_data) / <NUM_LIT:4>)<EOL>lst = struct.unpack('<STR_LIT:>>' + '<STR_LIT:I>' * num_associations, raw_data)<EOL>return cls(lst, length=length, offset=offset)<EOL>
Parse number list box.

        Parameters
        ----------
        fptr : file
            Open file object.
        offset : int
            Start position of box in bytes.
        length : int
            Length of the box in bytes.

        Returns
        -------
        LabelBox
            Instance of the current number list box.