/** @file crc.h * @date April 24, 2009 */ #ifndef CRC_H_ #define CRC_H_ /** Calculate a CRC for a file stream. The function seeks to the start of * the stream and then calculates the CRC until the end of the stream. * * @param file The file pointer. * @param result The CRC output. * * @return EXIT_SUCCESS or EXIT_FAILURE. */ extern int crc_file(FILE * file, u_long * result); /** Returns an initialized CRC value. This should be called before calling * crc_update and finally crc_reslut. * * @return The initialized CRC value. */ extern u_long crc_init(void); /** Return a final value for a CRC. The function should be called after * calling crc_init and crc_update some number of times. * * @param value The last value returned from crc_update. * * @return The final CRC value. */ extern u_long crc_result(u_long value); /** Returns an updated CRC value. The value is updated based on the values in * the buffer. This function should be called after crc_init. * * @param current The current or initial CRC. * @param buffer The buffer of dat. * @param size The size of the buffer. * * @return The updated CRC value. */ extern u_long crc_update(u_long current, const void * buffer, size_t size); #endif /* CRC_H_ */
