mirror of
git://sourceware.org/git/lvm2.git
synced 2024-10-28 03:27:58 +03:00
29 lines
719 B
C
29 lines
719 B
C
/*
|
|
* Copyright (C) 2001 Sistina Software (UK) Limited.
|
|
*
|
|
* This file is released under the LGPL.
|
|
*/
|
|
|
|
#include "lib.h"
|
|
#include "lvm-types.h"
|
|
|
|
/* Calculate an endian-independent CRC of supplied buffer */
|
|
uint32_t calc_crc(uint32_t initial, void *buf, uint32_t size)
|
|
{
|
|
static const uint32_t crctab[] = {
|
|
0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
|
|
0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
|
|
0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
|
|
0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
|
|
};
|
|
uint32_t i, crc = initial;
|
|
uint8_t *data = (uint8_t *) buf;
|
|
|
|
for (i = 0; i < size; i++) {
|
|
crc ^= *data++;
|
|
crc = (crc >> 4) ^ crctab[crc & 0xf];
|
|
crc = (crc >> 4) ^ crctab[crc & 0xf];
|
|
}
|
|
return crc;
|
|
}
|