Function crc16

engine/dlib/src/basis/transcoder/basisu_transcoder.cpp:262–275

	static inline uint8_t mul_8(uint32_t v, uint32_t q) { v = v * q + 128; return (uint8_t)((v + (v >> 8)) >> 8); }

	uint16_t crc16(const void* r, size_t size, uint16_t crc)
	{
		crc = ~crc;

		const uint8_t* p = static_cast<const uint8_t*>(r);
		for (; size; --size)
		{
			const uint16_t q = *p++ ^ (crc >> 8);
			uint16_t k = (q >> 4) ^ q;
			crc = (((crc << 8) ^ k) ^ (k << 5)) ^ (k << 12);
		}

		return static_cast<uint16_t>(~crc);
	}
		
	enum etc_constants
	{