186d7f5d3SJohn Marino /* $NetBSD: crc.c,v 1.1.1.1 2008/12/22 00:18:12 haad Exp $ */
286d7f5d3SJohn Marino
386d7f5d3SJohn Marino /*
486d7f5d3SJohn Marino * Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
586d7f5d3SJohn Marino * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
686d7f5d3SJohn Marino *
786d7f5d3SJohn Marino * This file is part of LVM2.
886d7f5d3SJohn Marino *
986d7f5d3SJohn Marino * This copyrighted material is made available to anyone wishing to use,
1086d7f5d3SJohn Marino * modify, copy, or redistribute it subject to the terms and conditions
1186d7f5d3SJohn Marino * of the GNU Lesser General Public License v.2.1.
1286d7f5d3SJohn Marino *
1386d7f5d3SJohn Marino * You should have received a copy of the GNU Lesser General Public License
1486d7f5d3SJohn Marino * along with this program; if not, write to the Free Software Foundation,
1586d7f5d3SJohn Marino * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
1686d7f5d3SJohn Marino */
1786d7f5d3SJohn Marino
1886d7f5d3SJohn Marino #include "lib.h"
1986d7f5d3SJohn Marino
2086d7f5d3SJohn Marino #include "crc.h"
2186d7f5d3SJohn Marino
2286d7f5d3SJohn Marino /* Calculate an endian-independent CRC of supplied buffer */
calc_crc(uint32_t initial,const void * buf,uint32_t size)2386d7f5d3SJohn Marino uint32_t calc_crc(uint32_t initial, const void *buf, uint32_t size)
2486d7f5d3SJohn Marino {
2586d7f5d3SJohn Marino static const uint32_t crctab[] = {
2686d7f5d3SJohn Marino 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
2786d7f5d3SJohn Marino 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
2886d7f5d3SJohn Marino 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
2986d7f5d3SJohn Marino 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
3086d7f5d3SJohn Marino };
3186d7f5d3SJohn Marino uint32_t i, crc = initial;
3286d7f5d3SJohn Marino const uint8_t *data = (const uint8_t *) buf;
3386d7f5d3SJohn Marino
3486d7f5d3SJohn Marino for (i = 0; i < size; i++) {
3586d7f5d3SJohn Marino crc ^= *data++;
3686d7f5d3SJohn Marino crc = (crc >> 4) ^ crctab[crc & 0xf];
3786d7f5d3SJohn Marino crc = (crc >> 4) ^ crctab[crc & 0xf];
3886d7f5d3SJohn Marino }
3986d7f5d3SJohn Marino return crc;
4086d7f5d3SJohn Marino }
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