crc16_ccitt.h

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/*
 * Copyright 2016 Ludwig Knüpfer <ludwig.knuepfer@fu-berlin.de>
 *
 * This file is subject to the terms and conditions of the GNU Lesser
 * General Public License v2.1. See the file LICENSE in the top level
 * directory for more details.
 */
 
#pragma once
 
#include <stdint.h>
#include <stdlib.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
uint16_t crc16_ccitt_kermit_update(uint16_t crc, const unsigned char *buf, size_t len);
 
uint16_t crc16_ccitt_kermit_calc(const unsigned char *buf, size_t len);
 
uint16_t crc16_ccitt_fcs_start(const unsigned char *buf, size_t len);
 
static inline uint16_t crc16_ccitt_fcs_update(uint16_t crc, const unsigned char *buf,
                                                  size_t len)
{
    /* Since CCITT-KERMIT and CCITT-FCS only differ in the starting
     * seed, we wrap around crc16_ccitt_kermit_update() for updating */
    return crc16_ccitt_kermit_update(crc, buf, len);
}
 
uint16_t crc16_ccitt_fcs_finish(uint16_t crc, const unsigned char *buf, size_t len);
 
uint16_t crc16_ccitt_fcs_calc(const unsigned char *buf, size_t len);
 
static inline uint16_t crc16_ccitt_mcrf4xx_update(uint16_t crc, const unsigned char *buf,
                                                  size_t len)
{
    /* Since CCITT-KERMIT and CCITT-MCRF4XX only differ in the starting
     * seed, we wrap around crc16_ccitt_kermit_update() for updating */
    return crc16_ccitt_kermit_update(crc, buf, len);
}
 
uint16_t crc16_ccitt_mcrf4xx_calc(const unsigned char *buf, size_t len);
 
uint16_t crc16_ccitt_false_update(uint16_t crc, const unsigned char *buf, size_t len);
 
uint16_t crc16_ccitt_false_calc(const unsigned char *buf, size_t len);
 
static inline uint16_t crc16_ccitt_aug_update(uint16_t crc, const unsigned char *buf, size_t len)
{
    /* Since CCITT-AUG and CCITT-FALSE only differ in the starting
     * seed, we wrap around crc16_ccitt_false_update() for updating */
    return crc16_ccitt_false_update(crc, buf, len);
}
 
uint16_t crc16_ccitt_aug_calc(const unsigned char *buf, size_t len);
 
#ifdef __cplusplus
}
#endif