85d8bf5713
This is needed for BTRFS. Signed-off-by: Marek Behun <marek.behun@nic.cz> create mode 100644 lib/crc32c.c
39 lines
960 B
C
39 lines
960 B
C
/*
|
|
* Copied from Linux kernel crypto/crc32c.c
|
|
* Copyright (c) 2004 Cisco Systems, Inc.
|
|
* Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the Free
|
|
* Software Foundation; either version 2 of the License, or (at your option)
|
|
* any later version.
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <compiler.h>
|
|
|
|
uint32_t crc32c_cal(uint32_t crc, const char *data, int length,
|
|
uint32_t *crc32c_table)
|
|
{
|
|
while (length--)
|
|
crc = crc32c_table[(u8)(crc ^ *data++)] ^ (crc >> 8);
|
|
|
|
return crc;
|
|
}
|
|
|
|
void crc32c_init(uint32_t *crc32c_table, uint32_t pol)
|
|
{
|
|
int i, j;
|
|
uint32_t v;
|
|
const uint32_t poly = pol; /* Bit-reflected CRC32C polynomial */
|
|
|
|
for (i = 0; i < 256; i++) {
|
|
v = i;
|
|
for (j = 0; j < 8; j++)
|
|
v = (v >> 1) ^ ((v & 1) ? poly : 0);
|
|
|
|
crc32c_table[i] = v;
|
|
}
|
|
}
|