bch/libcrc-2.0/include/checksum.h

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/*
 * Library: libcrc
 * File:    include/checksum.h
 * Author:  Lammert Bies
 *
 * This file is licensed under the MIT License as stated below
 *
 * Copyright (c) 1999-2016 Lammert Bies
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * Description
 * -----------
 * The headerfile include/checksum.h contains the definitions and prototypes
 * for routines that can be used to calculate several kinds of checksums.
 */

#ifndef DEF_LIBCRC_CHECKSUM_H
#define DEF_LIBCRC_CHECKSUM_H

#include <stdint.h>

/*
 * #define CRC_POLY_xxxx
 *
 * The constants of the form CRC_POLY_xxxx define the polynomials for some well
 * known CRC calculations.
 */

#define         CRC_POLY_16             0xA001
#define         CRC_POLY_32             0xEDB88320L
#define         CRC_POLY_CCITT          0x1021
#define         CRC_POLY_DNP            0xA6BC
#define         CRC_POLY_KERMIT         0x8408
#define         CRC_POLY_SICK           0x8005

/*
 * #define CRC_START_xxxx
 *
 * The constants of the form CRC_START_xxxx define the values that are used for
 * initialization of a CRC value for common used calculation methods.
 */

#define         CRC_START_8             0x00
#define         CRC_START_16            0x0000
#define         CRC_START_MODBUS        0xFFFF
#define         CRC_START_XMODEM        0x0000
#define         CRC_START_CCITT_1D0F    0x1D0F
#define         CRC_START_CCITT_FFFF    0xFFFF
#define         CRC_START_KERMIT        0x0000
#define         CRC_START_SICK          0x0000
#define         CRC_START_DNP           0x0000
#define         CRC_START_32            0xFFFFFFFFL

/*
 * Prototype list of global functions
 */

unsigned char *         checksum_NMEA(     const unsigned char *input_str, unsigned char *result  );
uint8_t                 crc_8(             const unsigned char *input_str, size_t num_bytes       );
uint16_t                crc_16(            const unsigned char *input_str, size_t num_bytes       );
uint32_t                crc_32(            const unsigned char *input_str, size_t num_bytes       );
uint16_t                crc_ccitt_1d0f(    const unsigned char *input_str, size_t num_bytes       );
uint16_t                crc_ccitt_ffff(    const unsigned char *input_str, size_t num_bytes       );
uint16_t                crc_dnp(           const unsigned char *input_str, size_t num_bytes       );
uint16_t                crc_kermit(        const unsigned char *input_str, size_t num_bytes       );
uint16_t                crc_modbus(        const unsigned char *input_str, size_t num_bytes       );
uint16_t                crc_sick(          const unsigned char *input_str, size_t num_bytes       );
uint16_t                crc_xmodem(        const unsigned char *input_str, size_t num_bytes       );
uint8_t                 update_crc_8(      uint8_t  crc, unsigned char c                          );
uint16_t                update_crc_16(     uint16_t crc, unsigned char c                          );
uint32_t                update_crc_32(     uint32_t crc, unsigned char c                          );
uint16_t                update_crc_ccitt(  uint16_t crc, unsigned char c                          );
uint16_t                update_crc_dnp(    uint16_t crc, unsigned char c                          );
uint16_t                update_crc_kermit( uint16_t crc, unsigned char c                          );
uint16_t                update_crc_sick(   uint16_t crc, unsigned char c, unsigned char prev_byte );

#endif  // DEF_LIBCRC_CHECKSUM_H