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// *****************************************************************************
// * This file is part of the FreeFileSync project. It is distributed under *
// * GNU General Public License: http://www.gnu.org/licenses/gpl-3.0 *
// * Copyright (C) Zenju (zenju AT freefilesync DOT org) - All Rights Reserved *
// *****************************************************************************
#ifndef CRC_H_23489275827847235
#define CRC_H_23489275827847235
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable: 4245) //'conversion' : conversion from 'int' to 'const boost::detail::mask_uint_t<0x08>::least', signed/unsigned mismatch
#endif
#include <boost/crc.hpp>
#ifdef _MSC_VER
#pragma warning(pop)
#endif
namespace zen
{
uint16_t getCrc16(const std::string& str);
uint32_t getCrc32(const std::string& str);
template <class ByteIterator> uint16_t getCrc16(ByteIterator first, ByteIterator last);
template <class ByteIterator> uint32_t getCrc32(ByteIterator first, ByteIterator last);
//------------------------- implementation -------------------------------
inline uint16_t getCrc16(const std::string& str) { return getCrc16(str.begin(), str.end()); }
inline uint32_t getCrc32(const std::string& str) { return getCrc32(str.begin(), str.end()); }
template <class ByteIterator> inline
uint16_t getCrc16(ByteIterator first, ByteIterator last)
{
static_assert(sizeof(typename std::iterator_traits<ByteIterator>::value_type) == 1, "");
boost::crc_16_type result;
if (first != last)
result.process_bytes(&*first, last - first);
auto rv = result.checksum();
static_assert(sizeof(rv) == sizeof(uint16_t), "");
return rv;
}
template <class ByteIterator> inline
uint32_t getCrc32(ByteIterator first, ByteIterator last)
{
static_assert(sizeof(typename std::iterator_traits<ByteIterator>::value_type) == 1, "");
boost::crc_32_type result;
if (first != last)
result.process_bytes(&*first, last - first);
auto rv = result.checksum();
static_assert(sizeof(rv) == sizeof(uint32_t), "");
return rv;
}
}
#endif //CRC_H_23489275827847235
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