50 lines
1.3 KiB
C++
50 lines
1.3 KiB
C++
// Copyright (C) 20011 Red Hat, Inc. All rights reserved.
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//
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// This file is part of the thin-provisioning-tools source.
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//
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// thin-provisioning-tools is free software: you can redistribute it
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// and/or modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation, either version 3 of
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// the License, or (at your option) any later version.
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//
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// thin-provisioning-tools is distributed in the hope that it will be
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// useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with thin-provisioning-tools. If not, see
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// <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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//----------------------------------------------------------------
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crc32c::crc32c(uint32_t xor_value)
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: xor_value_(xor_value),
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sum_(0)
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{
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}
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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;
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boost::crc_basic<32> crc(powers, 0xffffffff, 0, true, true);
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crc.process_bytes(buffer, len);
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sum_ = crc.checksum();
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}
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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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}
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//----------------------------------------------------------------
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