LXR linux/include/linux/crc-itu-t.h

   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  0x1021 (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
  18extern u16 const crc_itu_t_table[256];
  19
  20extern u16 crc_itu_t(u16 crc, const u8 *buffer, size_t len);
  21
  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