2019-06-03 05:44:46 +00:00
|
|
|
/* SPDX-License-Identifier: GPL-2.0-only */
|
2006-06-12 14:17:04 +00:00
|
|
|
/*
|
|
|
|
* crc-itu-t.h - CRC ITU-T V.41 routine
|
|
|
|
*
|
|
|
|
* Implements the standard CRC ITU-T V.41:
|
|
|
|
* Width 16
|
2015-04-28 11:11:28 +00:00
|
|
|
* Poly 0x1021 (x^16 + x^12 + x^15 + 1)
|
2006-06-12 14:17:04 +00:00
|
|
|
* Init 0
|
|
|
|
*/
|
|
|
|
|
|
|
|
#ifndef CRC_ITU_T_H
|
|
|
|
#define CRC_ITU_T_H
|
|
|
|
|
|
|
|
#include <linux/types.h>
|
|
|
|
|
|
|
|
extern u16 const crc_itu_t_table[256];
|
|
|
|
|
|
|
|
extern u16 crc_itu_t(u16 crc, const u8 *buffer, size_t len);
|
|
|
|
|
|
|
|
static inline u16 crc_itu_t_byte(u16 crc, const u8 data)
|
|
|
|
{
|
|
|
|
return (crc << 8) ^ crc_itu_t_table[((crc >> 8) ^ data) & 0xff];
|
|
|
|
}
|
|
|
|
|
|
|
|
#endif /* CRC_ITU_T_H */
|
|
|
|
|