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 crc_itu_t_byte(u16 crc,const u8 data)22static 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 29