LXR qemu/include/qemu/crc-ccitt.h

   1/*
   2 * CRC16 (CCITT) Checksum Algorithm
   3 *
   4 * Copyright (c) 2021 Wind River Systems, Inc.
   5 *
   6 * Author:
   7 *   Bin Meng <bin.meng@windriver.com>
   8 *
   9 * From Linux kernel v5.10 include/linux/crc-ccitt.h
  10 *
  11 * SPDX-License-Identifier: GPL-2.0
  12 */
  13
  14#ifndef _CRC_CCITT_H
  15#define _CRC_CCITT_H
  16
  17extern uint16_t const crc_ccitt_table[256];
  18extern uint16_t const crc_ccitt_false_table[256];
  19
  20extern uint16_t crc_ccitt(uint16_t crc, const uint8_t *buffer, size_t len);
  21extern uint16_t crc_ccitt_false(uint16_t crc, const uint8_t *buffer, size_t len);
  22
  23static inline uint16_t crc_ccitt_byte(uint16_t crc, const uint8_t c)
  24{
  25    return (crc >> 8) ^ crc_ccitt_table[(crc ^ c) & 0xff];
  26}
  27
  28static inline uint16_t crc_ccitt_false_byte(uint16_t crc, const uint8_t c)
  29{
  30    return (crc << 8) ^ crc_ccitt_false_table[(crc >> 8) ^ c];
  31}
  32
  33#endif /* _CRC_CCITT_H */
  34