1*32640292SAndy Fiddaman /*-
2*32640292SAndy Fiddaman * SPDX-License-Identifier: BSD-2-Clause
3*32640292SAndy Fiddaman *
4*32640292SAndy Fiddaman * Copyright (c) 2017, Fedor Uporov
5*32640292SAndy Fiddaman * All rights reserved.
6*32640292SAndy Fiddaman *
7*32640292SAndy Fiddaman * Redistribution and use in source and binary forms, with or without
8*32640292SAndy Fiddaman * modification, are permitted provided that the following conditions
9*32640292SAndy Fiddaman * are met:
10*32640292SAndy Fiddaman * 1. Redistributions of source code must retain the above copyright
11*32640292SAndy Fiddaman * notice, this list of conditions and the following disclaimer.
12*32640292SAndy Fiddaman * 2. Redistributions in binary form must reproduce the above copyright
13*32640292SAndy Fiddaman * notice, this list of conditions and the following disclaimer in the
14*32640292SAndy Fiddaman * documentation and/or other materials provided with the distribution.
15*32640292SAndy Fiddaman *
16*32640292SAndy Fiddaman * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
17*32640292SAndy Fiddaman * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18*32640292SAndy Fiddaman * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19*32640292SAndy Fiddaman * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
20*32640292SAndy Fiddaman * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21*32640292SAndy Fiddaman * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22*32640292SAndy Fiddaman * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23*32640292SAndy Fiddaman * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24*32640292SAndy Fiddaman * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25*32640292SAndy Fiddaman * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26*32640292SAndy Fiddaman * SUCH DAMAGE.
27*32640292SAndy Fiddaman */
28*32640292SAndy Fiddaman
29*32640292SAndy Fiddaman #include <sys/types.h>
30*32640292SAndy Fiddaman
31*32640292SAndy Fiddaman #ifndef _CRC16_H_
32*32640292SAndy Fiddaman #define _CRC16_H_
33*32640292SAndy Fiddaman
34*32640292SAndy Fiddaman extern uint16_t const crc16_table[256];
35*32640292SAndy Fiddaman
36*32640292SAndy Fiddaman static inline uint16_t
crc16(uint16_t crc,const void * buffer,unsigned int len)37*32640292SAndy Fiddaman crc16(uint16_t crc, const void *buffer, unsigned int len)
38*32640292SAndy Fiddaman {
39*32640292SAndy Fiddaman const unsigned char *cp = buffer;
40*32640292SAndy Fiddaman while (len--)
41*32640292SAndy Fiddaman crc = (((crc >> 8) & 0xffU) ^
42*32640292SAndy Fiddaman crc16_table[(crc ^ *cp++) & 0xffU]) & 0x0000ffffU;
43*32640292SAndy Fiddaman return crc;
44*32640292SAndy Fiddaman }
45*32640292SAndy Fiddaman
46*32640292SAndy Fiddaman #endif /* !_CRC16_H_ */
47