33 lines
953 B
C++
33 lines
953 B
C++
/*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Copyright 2010 Danny Robson <danny@nerdcruft.net>
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*/
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#include "bsdsum.hpp"
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uint16_t
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bsdsum (const void *restrict _data, size_t size) {
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const uint8_t *restrict data = static_cast<const uint8_t*> (_data);
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uint16_t accum = 0;
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for (size_t i = 0; i < size; ++i) {
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accum = (accum >> 1u) | ((accum & 0x01u) << 15u);
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accum += data[i];
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}
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return accum;
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}
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