@classmethod<EOL><INDENT>def parse(cls, fptr, offset, length):<DEDENT>
<EOL>nbytes = offset + length - fptr.tell()<EOL>fptr.read(nbytes)<EOL>return cls(length=length, offset=offset)<EOL>
Parse JPX free box.

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

        Returns
        -------
        FreeBox
            Instance of the current free box.