6189230202
Summary: Closes https://github.com/facebook/rocksdb/pull/2589 Differential Revision: D5431502 Pulled By: siying fbshipit-source-id: 8ebf8c87883daa9daa54b2303d11ce01ab1f6f75
43 lines
1.3 KiB
C++
43 lines
1.3 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
|
|
// This source code is licensed under both the GPLv2 (found in the
|
|
// COPYING file in the root directory) and Apache 2.0 License
|
|
// (found in the LICENSE.Apache file in the root directory).
|
|
//
|
|
/*
|
|
Murmurhash from http://sites.google.com/site/murmurhash/
|
|
|
|
All code is released to the public domain. For business purposes, Murmurhash is
|
|
under the MIT license.
|
|
*/
|
|
#pragma once
|
|
#include <stdint.h>
|
|
#include "rocksdb/slice.h"
|
|
|
|
#if defined(__x86_64__)
|
|
#define MURMUR_HASH MurmurHash64A
|
|
uint64_t MurmurHash64A ( const void * key, int len, unsigned int seed );
|
|
#define MurmurHash MurmurHash64A
|
|
typedef uint64_t murmur_t;
|
|
|
|
#elif defined(__i386__)
|
|
#define MURMUR_HASH MurmurHash2
|
|
unsigned int MurmurHash2 ( const void * key, int len, unsigned int seed );
|
|
#define MurmurHash MurmurHash2
|
|
typedef unsigned int murmur_t;
|
|
|
|
#else
|
|
#define MURMUR_HASH MurmurHashNeutral2
|
|
unsigned int MurmurHashNeutral2 ( const void * key, int len, unsigned int seed );
|
|
#define MurmurHash MurmurHashNeutral2
|
|
typedef unsigned int murmur_t;
|
|
#endif
|
|
|
|
// Allow slice to be hashable by murmur hash.
|
|
namespace rocksdb {
|
|
struct murmur_hash {
|
|
size_t operator()(const Slice& slice) const {
|
|
return MurmurHash(slice.data(), static_cast<int>(slice.size()), 0);
|
|
}
|
|
};
|
|
} // rocksdb
|