def write_ulong(self, l):
        """
        Writes a 4 byte unsigned integer to the stream.

        @param l: 4 byte unsigned integer
        @type l: C{int}
        @raise TypeError: Unexpected type for int C{l}.
        @raise OverflowError: Not in range.
        """
        if type(l) not in python.int_types:
            raise TypeError('expected an int (got:%r)' % (type(l),))

        if not 0 <= l <= 4294967295:
            raise OverflowError("Not in range, %d" % l)

        self.write(struct.pack("%sL" % self.endian, l))