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39 lines
1.2 KiB
C
39 lines
1.2 KiB
C
/*
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* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
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* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
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*
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* This file is part of LVM2.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU Lesser General Public License v.2.1.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "lib.h"
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#include "crc.h"
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/* Calculate an endian-independent CRC of supplied buffer */
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uint32_t calc_crc(uint32_t initial, const void *buf, uint32_t size)
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{
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static const uint32_t crctab[] = {
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0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
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0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
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0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
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0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
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};
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uint32_t i, crc = initial;
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const uint8_t *data = (const uint8_t *) buf;
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for (i = 0; i < size; i++) {
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crc ^= *data++;
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crc = (crc >> 4) ^ crctab[crc & 0xf];
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crc = (crc >> 4) ^ crctab[crc & 0xf];
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}
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return crc;
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}
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