thin-provisioning-tools/checksum.cc

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// Copyright (C) 2011 Red Hat, Inc. All rights reserved.
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//
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// This file is part of the thin-provisioning-tools source.
//
// thin-provisioning-tools 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 3 of
// the License, or (at your option) any later version.
//
// thin-provisioning-tools is distributed in the hope that it will be
// useful, but WITHOUT ANY WARRANTY; without even the implied warranty
// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with thin-provisioning-tools. If not, see
// <http://www.gnu.org/licenses/>.
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#include "checksum.h"
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#include <boost/crc.hpp>
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using namespace base;
//----------------------------------------------------------------
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crc32c::crc32c(uint32_t xor_value)
: xor_value_(xor_value),
sum_(0)
{
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}
void
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crc32c::append(void const *buffer, unsigned len)
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{
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uint32_t const powers = 0x1EDC6F41;
boost::crc_basic<32> crc(powers, 0xffffffff, 0, true, true);
crc.process_bytes(buffer, len);
sum_ = crc.checksum();
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}
uint32_t
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crc32c::get_sum() const
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{
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return sum_ ^ xor_value_;
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}
//----------------------------------------------------------------