crc-itu-t.h 531 B

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  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^15 + 1)
  8. * Init 0
  9. */
  10. #ifndef CRC_ITU_T_H
  11. #define CRC_ITU_T_H
  12. #include <linux/types.h>
  13. extern u16 const crc_itu_t_table[256];
  14. extern u16 crc_itu_t(u16 crc, const u8 *buffer, size_t len);
  15. static inline u16 crc_itu_t_byte(u16 crc, const u8 data)
  16. {
  17. return (crc << 8) ^ crc_itu_t_table[((crc >> 8) ^ data) & 0xff];
  18. }
  19. #endif /* CRC_ITU_T_H */