void xor(unsigned char * dst, unsigned char * src, size_t len);
int32_t le24toh (uint8_t data[3]);
uint32_t PackBits(uint8_t start, uint8_t len, uint8_t* bits);
-void rol(uint8_t *data, const size_t len);
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+void rol(uint8_t *data, const size_t len);
+uint32_t SwapBits(uint32_t value, int nrbits);
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