122 lines
3.4 KiB
C
122 lines
3.4 KiB
C
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///\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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https://www.etlcpp.com
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Copyright(c) 2014 John Wellbelove
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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_JENKINS_INCLUDED
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#define ETL_JENKINS_INCLUDED
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#include "platform.h"
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#include "static_assert.h"
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#include "type_traits.h"
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#include "error_handler.h"
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#include "ihash.h"
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#include "frame_check_sequence.h"
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#include "iterator.h"
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#include <stdint.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 jenkins Jenkins 32 hash calculation
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///\ingroup maths
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namespace etl
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{
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//***************************************************************************
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/// Jenkins policy.
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/// Calculates 32 bit Jenkins hash.
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//***************************************************************************
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struct jenkins_policy
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{
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typedef uint32_t value_type;
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uint32_t initial() const
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{
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is_finalised = false;
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return 0;
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}
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uint32_t add(value_type hash, uint8_t value) const
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{
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ETL_ASSERT(!is_finalised, ETL_ERROR(hash_finalised));
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hash += value;
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hash += (hash << 10U);
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hash ^= (hash >> 6U);
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return hash;
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}
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uint32_t final(value_type hash) const
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{
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hash += (hash << 3U);
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hash ^= (hash >> 11U);
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hash += (hash << 15U);
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is_finalised = true;
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return hash;
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}
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mutable bool is_finalised;
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};
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//*************************************************************************
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/// jenkins
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//*************************************************************************
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class jenkins : public etl::frame_check_sequence<etl::jenkins_policy>
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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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jenkins()
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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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jenkins(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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