33 lines
1.4 KiB
C
33 lines
1.4 KiB
C
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// Copyright (c) 2013, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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#pragma once
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#ifndef ROCKSDB_LITE
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#include "util/murmurhash.h"
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namespace rocksdb {
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static const unsigned int kMaxNumHashTable = 64;
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unsigned int GetSliceMurmurHash(const Slice& s, unsigned int index,
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unsigned int max_num_buckets) {
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static constexpr unsigned int seeds[kMaxNumHashTable] = {
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816922183, 506425713, 949485004, 22513986, 421427259, 500437285,
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888981693, 847587269, 511007211, 722295391, 934013645, 566947683,
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193618736, 428277388, 770956674, 819994962, 755946528, 40807421,
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263144466, 241420041, 444294464, 731606396, 304158902, 563235655,
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968740453, 336996831, 462831574, 407970157, 985877240, 637708754,
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736932700, 205026023, 755371467, 729648411, 807744117, 46482135,
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847092855, 620960699, 102476362, 314094354, 625838942, 550889395,
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639071379, 834567510, 397667304, 151945969, 443634243, 196618243,
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421986347, 407218337, 964502417, 327741231, 493359459, 452453139,
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692216398, 108161624, 816246924, 234779764, 618949448, 496133787,
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156374056, 316589799, 982915425, 553105889 };
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return MurmurHash(s.data(), s.size(), seeds[index]) % max_num_buckets;
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}
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} // namespace rocksdb
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#endif // ROCKSDB_LITE
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