| // 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 |