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util: Add CRC16 (CCITT) calculation routines

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Import CRC16 calculation routines from Linux kernel v5.10:

  include/linux/crc-ccitt.h
  lib/crc-ccitt.c

to QEMU:

  include/qemu/crc-ccitt.h
  util/crc-ccitt.c

Signed-off-by: Bin Meng <bin.meng@windriver.com>
Acked-by: Alistair Francis <alistair.francis@wdc.com>
Message-Id: <20210123104016.17485-7-bmeng.cn@gmail.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
[PMD: Restrict compilation to system emulation]
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
This commit is contained in:
Bin Meng 2021-01-23 18:39:57 +08:00 • committed by Philippe Mathieu-Daudé
parent e9d28020d2
commit 0b73ce3060
3 changed files with 161 additions and 0 deletions
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33
include/qemu/crc-ccitt.h Normal file
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/*
* CRC16 (CCITT) Checksum Algorithm
*
* Copyright (c) 2021 Wind River Systems, Inc.
*
* Author:
* Bin Meng <bin.meng@windriver.com>
*
* From Linux kernel v5.10 include/linux/crc-ccitt.h
*
* SPDX-License-Identifier: GPL-2.0
*/
#ifndef _CRC_CCITT_H
#define _CRC_CCITT_H
extern uint16_t const crc_ccitt_table[256];
extern uint16_t const crc_ccitt_false_table[256];
extern uint16_t crc_ccitt(uint16_t crc, const uint8_t *buffer, size_t len);
extern uint16_t crc_ccitt_false(uint16_t crc, const uint8_t *buffer, size_t len);
static inline uint16_t crc_ccitt_byte(uint16_t crc, const uint8_t c)
{
return (crc >> 8) ^ crc_ccitt_table[(crc ^ c) & 0xff];
}
static inline uint16_t crc_ccitt_false_byte(uint16_t crc, const uint8_t c)
{
return (crc << 8) ^ crc_ccitt_false_table[(crc >> 8) ^ c];
}
#endif /* _CRC_CCITT_H */