uint8_t GetParity( char *string, uint8_t type, int length);
void wiegand_add_parity(char *target, char *source, char length);
+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);