#define UNSTUFF_BITS(resp,start,size)					\
	({								\
		const unsigned long __mask = (1 << (size)) - 1;			\
		const int __off = 3 - ((start) / 32);			\
		const int __shft = (start) & 31;			\
		unsigned long __res;						\
									\
		__res = resp[__off] >> __shft;				\
		if ((size) + __shft >= 32)				\
			__res |= resp[__off-1] << (32 - __shft);	\
		__res & __mask;						\
	})