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crc-itu-t.h

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linux-6.19.14/include/linux/crc-itu-t.h C
 1/* SPDX-License-Identifier: GPL-2.0-only */
 2/*
 3 *	crc-itu-t.h - CRC ITU-T V.41 routine
 4 *
 5 * Implements the standard CRC ITU-T V.41:
 6 *   Width 16
 7 *   Poly  0x1021 (x^16 + x^12 + x^5 + 1)
 8 *   Init  0
 9 */
10
11#ifndef CRC_ITU_T_H
12#define CRC_ITU_T_H
13
14#include <linux/types.h>
15
16extern u16 const crc_itu_t_table[256];
17
18extern u16 crc_itu_t(u16 crc, const u8 *buffer, size_t len);
19
20static inline u16 crc_itu_t_byte(u16 crc, const u8 data)
21{
22	return (crc << 8) ^ crc_itu_t_table[((crc >> 8) ^ data) & 0xff];
23}
24
25#endif /* CRC_ITU_T_H */
26
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