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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-21 11:54:28 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-21 11:54:28 +0000 |
commit | e6918187568dbd01842d8d1d2c808ce16a894239 (patch) | |
tree | 64f88b554b444a49f656b6c656111a145cbbaa28 /src/rocksdb/util/murmurhash.h | |
parent | Initial commit. (diff) | |
download | ceph-upstream/18.2.2.tar.xz ceph-upstream/18.2.2.zip |
Adding upstream version 18.2.2.upstream/18.2.2
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/rocksdb/util/murmurhash.h')
-rw-r--r-- | src/rocksdb/util/murmurhash.h | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/src/rocksdb/util/murmurhash.h b/src/rocksdb/util/murmurhash.h new file mode 100644 index 000000000..7ef4cbbec --- /dev/null +++ b/src/rocksdb/util/murmurhash.h @@ -0,0 +1,43 @@ +// 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 +using murmur_t = uint64_t; + +#elif defined(__i386__) +#define MURMUR_HASH MurmurHash2 +unsigned int MurmurHash2(const void* key, int len, unsigned int seed); +#define MurmurHash MurmurHash2 +using murmur_t = unsigned int; + +#else +#define MURMUR_HASH MurmurHashNeutral2 +unsigned int MurmurHashNeutral2(const void* key, int len, unsigned int seed); +#define MurmurHash MurmurHashNeutral2 +using murmur_t = unsigned int; +#endif + +// Allow slice to be hashable by murmur hash. +namespace ROCKSDB_NAMESPACE { +struct murmur_hash { + size_t operator()(const Slice& slice) const { + return MurmurHash(slice.data(), static_cast<int>(slice.size()), 0); + } +}; +} // namespace ROCKSDB_NAMESPACE |