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crc-itu-t.h
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1 /*
2  * crc-itu-t.h - CRC ITU-T V.41 routine
3  *
4  * Implements the standard CRC ITU-T V.41:
5  * Width 16
6  * Poly 0x0x1021 (x^16 + x^12 + x^15 + 1)
7  * Init 0
8  *
9  * This source code is licensed under the GNU General Public License,
10  * Version 2. See the file COPYING for more details.
11  */
12 
13 #ifndef CRC_ITU_T_H
14 #define CRC_ITU_T_H
15 
16 #include <linux/types.h>
17 
18 extern u16 const crc_itu_t_table[256];
19 
20 extern u16 crc_itu_t(u16 crc, const u8 *buffer, size_t len);
21 
22 static inline u16 crc_itu_t_byte(u16 crc, const u8 data)
23 {
24  return (crc << 8) ^ crc_itu_t_table[((crc >> 8) ^ data) & 0xff];
25 }
26 
27 #endif /* CRC_ITU_T_H */
28