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lib: Add CRC32-C

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This is needed for BTRFS.

Signed-off-by: Marek Behun <marek.behun@nic.cz>

 create mode 100644 lib/crc32c.c
This commit is contained in:
Marek Behún
2017-09-03 17:00:23 +02:00
committed by Tom Rini
parent 43dd6dacb2
commit 85d8bf5713
4 changed files with 46 additions and 0 deletions
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38
lib/crc32c.c Normal file
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/*
* 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;
}
}