def hexadecimal(token):
        """
        Convert a strip of hexadecimal numbers into binary data.

        @type  token: str
        @param token: String to parse.

        @rtype:  str
        @return: Parsed string value.
        """
        token = ''.join([ c for c in token if c.isalnum() ])
        if len(token) % 2 != 0:
            raise ValueError("Missing characters in hex data")
        data = ''
        for i in compat.xrange(0, len(token), 2):
            x = token[i:i+2]
            d = int(x, 16)
            s = struct.pack('<B', d)
            data += s
        return data
Convert a strip of hexadecimal numbers into binary data.

        @type  token: str
        @param token: String to parse.

        @rtype:  str
        @return: Parsed string value.