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
16 extern u16 const crc_itu_t_table[256];
17
18 extern u16 crc_itu_t(u16 crc, const u8 *buffer, size_t len);
19
20 static 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
27
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