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///\file
/******************************************************************************
The MIT License(MIT)
Embedded Template Library.
https://github.com/ETLCPP/etl
http://www.etlcpp.com
Copyright(c) 2014 jwellbelove
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files(the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions :
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
******************************************************************************/
#ifndef __ETL_CRC32__
#define __ETL_CRC32__
#include <stdint.h>
#include <iterator>
#include "platform.h"
#include "frame_check_sequence.h"
#if defined(ETL_COMPILER_KEIL)
#pragma diag_suppress 1300
#endif
///\defgroup crc32 32 bit CRC calculation
///\ingroup crc
namespace etl
{
//***************************************************************************
/// CRC32 table
/// \ingroup crc32
//***************************************************************************
extern const uint32_t CRC32[];
//***************************************************************************
/// CRC32 policy.
/// Calculates CRC32 using polynomial 0x04C11DB7.
//***************************************************************************
struct crc_policy_32
{
typedef uint32_t value_type;
inline uint32_t initial() const
{
return 0xFFFFFFFF;
}
inline uint32_t add(uint32_t crc, uint8_t value) const
{
return (crc >> 8) ^ CRC32[(crc ^ value) & 0xFF];
}
inline uint32_t final(uint32_t crc) const
{
return crc ^ 0xFFFFFFFF;
}
};
//*************************************************************************
/// CRC32
//*************************************************************************
class crc32 : public etl::frame_check_sequence<etl::crc_policy_32>
{
public:
//*************************************************************************
/// Default constructor.
//*************************************************************************
crc32()
{
this->reset();
}
//*************************************************************************
/// Constructor from range.
/// \param begin Start of the range.
/// \param end End of the range.
//*************************************************************************
template<typename TIterator>
crc32(TIterator begin, const TIterator end)
{
this->reset();
this->add(begin, end);
}
};
}
#endif
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