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Diffstat (limited to 'src/mongo/util/murmur3.h')
| -rw-r--r-- | src/mongo/util/murmur3.h | 114 |
1 files changed, 0 insertions, 114 deletions
diff --git a/src/mongo/util/murmur3.h b/src/mongo/util/murmur3.h deleted file mode 100644 index 9793cf3ae66..00000000000 --- a/src/mongo/util/murmur3.h +++ /dev/null @@ -1,114 +0,0 @@ -/** - * Copyright (C) 2023-present MongoDB, Inc. - * - * This program is free software: you can redistribute it and/or modify - * it under the terms of the Server Side Public License, version 1, - * as published by MongoDB, Inc. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * Server Side Public License for more details. - * - * You should have received a copy of the Server Side Public License - * along with this program. If not, see - * <http://www.mongodb.com/licensing/server-side-public-license>. - * - * As a special exception, the copyright holders give permission to link the - * code of portions of this program with the OpenSSL library under certain - * conditions as described in each individual source file and distribute - * linked combinations including the program with the OpenSSL library. You - * must comply with the Server Side Public License in all respects for - * all of the code used other than as permitted herein. If you modify file(s) - * with this exception, you may extend this exception to your version of the - * file(s), but you are not obligated to do so. If you do not wish to do so, - * delete this exception statement from your version. If you delete this - * exception statement from all source files in the program, then also delete - * it in the license file. - */ - -#pragma once - -#include <third_party/murmurhash3/MurmurHash3.h> - -#include "mongo/base/data_range.h" -#include "mongo/base/data_type_endian.h" -#include "mongo/base/data_view.h" -#include "mongo/base/string_data.h" - -namespace mongo { - -/** - * Wraps the third-party hash function MurmurHash3. Callers should generally prefer this wrapper (or - * one of the other overloads below) rather than calling into the third-party functions directly. - * This interface is intended to be easier to consume safely. - */ -template <int SizeOfOutput> -inline size_t murmur3(StringData str, size_t seed); - -/** - * Template specialization for hashing a 'StringData' to a 32-bit hash code. - */ -template <> -inline size_t murmur3<4>(StringData str, size_t seed) { - char hash[4]; - MurmurHash3_x86_32(str.rawData(), str.size(), seed, &hash); - return ConstDataView(hash).read<LittleEndian<std::uint32_t>>(); -} - -/** - * Template specialization for hashing a 'StringData' to a 64-bit hash code. Returns the first 8 - * bytes of the 128-bit version of MurmurHash, interpreting these 8 bytes as having a little-endian - * byte order. - */ -template <> -inline size_t murmur3<8>(StringData str, size_t seed) { - char hash[16]; - MurmurHash3_x64_128(str.rawData(), str.size(), seed, hash); - return static_cast<size_t>(ConstDataView(hash).read<LittleEndian<std::uint64_t>>()); -} - -/** - * Overload for callers which use a byte-array representation for the data and thus cannot easily - * represent the input as a 'StringData'. - */ -template <int SizeOfOutput> -inline size_t murmur3(ConstDataRange data, size_t seed); - -/** - * Template specialization for hashing a 'ConstDataRange' to a 32-bit hash code. - */ -template <> -inline size_t murmur3<4>(ConstDataRange data, size_t seed) { - char hash[4]; - MurmurHash3_x86_32(data.data(), data.length(), seed, &hash); - return ConstDataView(hash).read<LittleEndian<std::uint32_t>>(); -} - -/** - * Template specialization for hashing a 'ConstDataRange' to a 64-bit hash code. Returns the first 8 - * bytes of the 128-bit version of MurmurHash, interpreting these 8 bytes as having a little-endian - * byte order. - */ -template <> -inline size_t murmur3<8>(ConstDataRange data, size_t seed) { - char hash[16]; - MurmurHash3_x64_128(data.data(), data.length(), seed, hash); - return static_cast<size_t>(ConstDataView(hash).read<LittleEndian<std::uint64_t>>()); -} - -/** - * Writes the full output of the 128-bit version of MurmurHash to the given 'output' array. - */ -inline void murmur3(StringData str, size_t seed, std::array<char, 16>& output) { - MurmurHash3_x64_128(str.rawData(), str.size(), seed, output.data()); -} - -/** - * 128-bit overload where the input is given as a 'ConstDataRange'. - */ -inline void murmur3(ConstDataRange data, size_t seed, std::array<char, 16>& output) { - MurmurHash3_x64_128(data.data(), data.length(), seed, output.data()); -} - -} // namespace mongo |
