678c259c66
C++ doesn't define overflow on signed types, so use unsigned types instead. Luckily all right shifts were unsigned anyway. Some signed extension was happening (handling remainders after processing 8-byte chunks) but should still be there. Caught by debug build.
51 lines
1.7 KiB
C++
51 lines
1.7 KiB
C++
/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. 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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* Modified by Cloudius Systems.
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* Copyright 2015 Cloudius Systems.
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*/
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#pragma once
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#include <cstdint>
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#include <array>
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#include "database.hh"
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/**
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* This is a very fast, non-cryptographic hash suitable for general hash-based
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* lookup. See http://murmurhash.googlepages.com/ (Murmur Hash 2) and
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* https://code.google.com/p/smhasher/wiki/MurmurHash3.
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*
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* This code is not based on the original Murmur Hash C code, but rather
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* a translation of Cassandra's Java version back to C.
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**/
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namespace utils {
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namespace murmur_hash
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{
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uint32_t hash32(const bytes &data, uint32_t offset, uint32_t length,
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int32_t seed);
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uint64_t hash2_64(const bytes &key, uint32_t offset, uint32_t length,
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uint64_t seed);
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void hash3_x64_128(const bytes &key, uint32_t offset, uint32_t length,
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uint64_t seed, std::array<uint64_t,2> &result);
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};
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} // namespace utils
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