crc32.hpp

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/*
 * Copyright (C) 2011-2014 Daniel Scharrer
 *
 * This software is provided 'as-is', without any express or implied
 * warranty.  In no event will the author(s) be held liable for any damages
 * arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 *    claim that you wrote the original software. If you use this software
 *    in a product, an acknowledgment in the product documentation would be
 *    appreciated but is not required.
 * 2. Altered source versions must be plainly marked as such, and must not be
 *    misrepresented as being the original software.
 * 3. This notice may not be removed or altered from any source distribution.
 */

#ifndef INNOEXTRACT_CRYPTO_CRC32_HPP
#define INNOEXTRACT_CRYPTO_CRC32_HPP

#include <boost/cstdint.hpp>

#include "crypto/checksum.hpp"

namespace crypto {

struct crc32 : public checksum_base<crc32> {
  
  void init() { crc = CRC32_NEGL; }
  
  void update(const char * data, size_t length);
  
  boost::uint32_t finalize() const { return crc ^ CRC32_NEGL; }
  
private:
  
  static const boost::uint32_t CRC32_NEGL = 0xffffffffl;
  
  boost::uint32_t crc;
};

} // namespace crypto

#endif // INNOEXTRACT_CRYPTO_CRC32_HPP