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44 lines
1.3 KiB
44 lines
1.3 KiB
1 year ago
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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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//
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/*
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Murmurhash from http://sites.google.com/site/murmurhash/
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All code is released to the public domain. For business purposes, Murmurhash
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is under the MIT license.
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*/
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#pragma once
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#include <stdint.h>
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#include "rocksdb/slice.h"
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#if defined(__x86_64__)
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#define MURMUR_HASH MurmurHash64A
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uint64_t MurmurHash64A(const void* key, int len, unsigned int seed);
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#define MurmurHash MurmurHash64A
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using murmur_t = uint64_t;
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#elif defined(__i386__)
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#define MURMUR_HASH MurmurHash2
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unsigned int MurmurHash2(const void* key, int len, unsigned int seed);
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#define MurmurHash MurmurHash2
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using murmur_t = unsigned int;
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#else
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#define MURMUR_HASH MurmurHashNeutral2
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unsigned int MurmurHashNeutral2(const void* key, int len, unsigned int seed);
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#define MurmurHash MurmurHashNeutral2
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using murmur_t = unsigned int;
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#endif
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// Allow slice to be hashable by murmur hash.
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namespace ROCKSDB_NAMESPACE {
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struct murmur_hash {
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size_t operator()(const Slice& slice) const {
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return MurmurHash(slice.data(), static_cast<int>(slice.size()), 0);
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}
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};
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} // namespace ROCKSDB_NAMESPACE
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