xref: /OK3568_Linux_fs/kernel/include/linux/crc16.h (revision 4882a59341e53eb6f0b4789bf948001014eff981) 
1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0-only */
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun  *	crc16.h - CRC-16 routine
4*4882a593Smuzhiyun  *
5*4882a593Smuzhiyun  * Implements the standard CRC-16:
6*4882a593Smuzhiyun  *   Width 16
7*4882a593Smuzhiyun  *   Poly  0x8005 (x^16 + x^15 + x^2 + 1)
8*4882a593Smuzhiyun  *   Init  0
9*4882a593Smuzhiyun  *
10*4882a593Smuzhiyun  * Copyright (c) 2005 Ben Gardner <bgardner@wabtec.com>
11*4882a593Smuzhiyun  */
12*4882a593Smuzhiyun 
13*4882a593Smuzhiyun #ifndef __CRC16_H
14*4882a593Smuzhiyun #define __CRC16_H
15*4882a593Smuzhiyun 
16*4882a593Smuzhiyun #include <linux/types.h>
17*4882a593Smuzhiyun 
18*4882a593Smuzhiyun extern u16 const crc16_table[256];
19*4882a593Smuzhiyun 
20*4882a593Smuzhiyun extern u16 crc16(u16 crc, const u8 *buffer, size_t len);
21*4882a593Smuzhiyun 
crc16_byte(u16 crc,const u8 data)22*4882a593Smuzhiyun static inline u16 crc16_byte(u16 crc, const u8 data)
23*4882a593Smuzhiyun {
24*4882a593Smuzhiyun 	return (crc >> 8) ^ crc16_table[(crc ^ data) & 0xff];
25*4882a593Smuzhiyun }
26*4882a593Smuzhiyun 
27*4882a593Smuzhiyun #endif /* __CRC16_H */
28*4882a593Smuzhiyun 
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