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Tip revision: fe637231e8206aa05a875fe4cbf6c679ecb398f1 authored by sdong on 31 October 2019, 21:10:18 UTC
[FB Internal] Point to the latest tool chain.
[FB Internal] Point to the latest tool chain.
Tip revision: fe63723
hash.cc
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
#include <string.h>
#include "util/coding.h"
#include "util/hash.h"
namespace leveldb {
uint32_t Hash(const char* data, size_t n, uint32_t seed) {
// Similar to murmur hash
const uint32_t m = 0xc6a4a793;
const uint32_t r = 24;
const char* limit = data + n;
uint32_t h = seed ^ (n * m);
// Pick up four bytes at a time
while (data + 4 <= limit) {
uint32_t w = DecodeFixed32(data);
data += 4;
h += w;
h *= m;
h ^= (h >> 16);
}
// Pick up remaining bytes
switch (limit - data) {
case 3:
h += data[2] << 16;
// fall through
case 2:
h += data[1] << 8;
// fall through
case 1:
h += data[0];
h *= m;
h ^= (h >> r);
break;
}
return h;
}
} // namespace leveldb