libcruft-util/hash/crc.hpp

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/*
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* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
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* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
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* Copyright 2011 Danny Robson <danny@nerdcruft.net>
*/
#ifndef __UTIL_HASH_CRC_HPP
#define __UTIL_HASH_CRC_HPP
#include <cstdint>
#include <cstdlib>
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///////////////////////////////////////////////////////////////////////////////
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namespace util::hash {
// Implements the crc32 checksum (from ethernet, png, etc).
// Adapted from the PNG specification (ISO/IEC 15948:2003), appendix D.
class crc32 {
public:
using digest_t = uint32_t;
crc32 () noexcept;
void reset (void) noexcept;
void update (const void *restrict data, size_t bytes) noexcept;
void update (const uint8_t *restrict first, const uint8_t *restrict last) noexcept;
void finish (void);
digest_t digest (void) const;
private:
digest_t m_digest;
};
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}
#endif