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109 lines
3.3 KiB
C++
109 lines
3.3 KiB
C++
///\file
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/******************************************************************************
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The MIT License(MIT)
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Embedded Template Library.
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https://github.com/ETLCPP/etl
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http://www.etlcpp.com
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Copyright(c) 2014 jwellbelove
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files(the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions :
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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******************************************************************************/
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#ifndef __ETL_CRC16_CCITT__
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#define __ETL_CRC16_CCITT__
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#include <stdint.h>
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#include <iterator>
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#include "platform.h"
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#include "frame_check_sequence.h"
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#if defined(ETL_COMPILER_KEIL)
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#pragma diag_suppress 1300
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#endif
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///\defgroup crc16_ccitt 16 bit CRC CCITT calculation
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///\ingroup crc
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namespace etl
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{
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//***************************************************************************
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/// CRC-CCITT table
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/// \ingroup crc16_ccitt
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//***************************************************************************
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extern const uint16_t CRC_CCITT[];
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//***************************************************************************
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/// CRC16 CCITT policy.
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/// Calculates CRC16 CCITT using polynomial 0x1021
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//***************************************************************************
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struct crc_policy_16_ccitt
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{
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typedef uint16_t value_type;
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inline uint16_t initial() const
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{
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return 0xFFFF;
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}
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inline uint16_t add(uint16_t crc, uint8_t value) const
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{
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return (crc << 8) ^ CRC_CCITT[((crc >> 8) ^ value) & 0xFF];
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}
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inline uint16_t final(uint16_t crc) const
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{
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return crc;
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}
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};
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//*************************************************************************
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/// CRC16 CCITT
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//*************************************************************************
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class crc16_ccitt : public etl::frame_check_sequence<etl::crc_policy_16_ccitt>
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{
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public:
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//*************************************************************************
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/// Default constructor.
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//*************************************************************************
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crc16_ccitt()
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{
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this->reset();
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}
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//*************************************************************************
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/// Constructor from range.
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/// \param begin Start of the range.
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/// \param end End of the range.
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//*************************************************************************
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template<typename TIterator>
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crc16_ccitt(TIterator begin, const TIterator end)
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{
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this->reset();
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this->add(begin, end);
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}
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};
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}
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#endif
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