crc16.h

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/*
 *      crc16.h - CRC-16 routine
 *
 * Implements the standard CRC-16:
 * - Width 16
 * - Poly  0x8005 (x^16 + x^15 + x^2 + 1)
 * - Init  0
 *
 * Copyright (c) 2005 Ben Gardner <bgardner@wabtec.com>
 *
 * This source code is licensed under the GNU General Public License,
 * Version 2. See the file COPYING for more details.
 */
 
#pragma once
 
#include <stdint.h>
 
#include <sys/types.h>
 
extern uint16_t const osmo_crc16_table[256];
 
extern uint16_t osmo_crc16(uint16_t crc, const uint8_t *buffer, size_t len);

static inline uint16_t osmo_crc16_byte(uint16_t crc, const uint8_t data)
{
        return (crc >> 8) ^ osmo_crc16_table[(crc ^ data) & 0xff];
}
 
 
 
extern uint16_t const osmo_crc16_ccitt_table[256];
 
extern uint16_t osmo_crc16_ccitt(uint16_t crc, const uint8_t *buffer, size_t len);

static inline uint16_t osmo_crc16_ccitt_byte(uint16_t crc, const uint8_t data)
{
        return (crc >> 8) ^ osmo_crc16_ccitt_table[(crc ^ data) & 0xff];
}