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 crc_itu_t_byte(u16 crc,const u8 data)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 27