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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
// MurmurHash3 was written by Austin Appleby, and is placed in the public
// domain. The author hereby disclaims copyright to this source code.
#ifndef BUTIL_THIRD_PARTY_MURMURHASH3_MURMURHASH3_H
#define BUTIL_THIRD_PARTY_MURMURHASH3_MURMURHASH3_H
// ======= Platform-specific functions and macros =======
// Microsoft Visual Studio
#if defined(_MSC_VER) && (_MSC_VER < 1600)
typedef unsigned char uint8_t;
typedef unsigned int uint32_t;
typedef unsigned __int64 uint64_t;
// Other compilers
#else // defined(_MSC_VER)
#include <stdint.h>
#endif // !defined(_MSC_VER)
#if defined(_MSC_VER)
#define MURMURHASH_FORCE_INLINE __forceinline
#define BIG_CONSTANT(x) (x)
#else
#define MURMURHASH_FORCE_INLINE inline __attribute__((always_inline))
#define BIG_CONSTANT(x) (x##LLU)
#endif
namespace butil {
// Finalization mix - force all bits of a hash block to avalanche
MURMURHASH_FORCE_INLINE uint32_t fmix32 (uint32_t h) {
h ^= h >> 16;
h *= 0x85ebca6b;
h ^= h >> 13;
h *= 0xc2b2ae35;
h ^= h >> 16;
return h;
}
MURMURHASH_FORCE_INLINE uint64_t fmix64 (uint64_t k) {
k ^= k >> 33;
k *= BIG_CONSTANT(0xff51afd7ed558ccd);
k ^= k >> 33;
k *= BIG_CONSTANT(0xc4ceb9fe1a85ec53);
k ^= k >> 33;
return k;
}
// ========= Original version ===========
void MurmurHash3_x86_32(const void* key, int len, uint32_t seed, void* out);
void MurmurHash3_x86_128(const void* key, int len, uint32_t seed, void* out);
void MurmurHash3_x64_128(const void* key, int len, uint32_t seed, void* out);
// ========= Iterative version ==========
// for computing hashcode for very large inputs, say file contents. The API are
// similar with iterative MD5 API.
// Notice: |ctx| must be non-NULL and valid, otherwise the behavior is undefined.
struct MurmurHash3_x86_32_Context {
uint32_t h1;
int total_len;
int tail_len;
uint8_t tail[4];
};
void MurmurHash3_x86_32_Init(MurmurHash3_x86_32_Context* ctx, uint32_t seed);
void MurmurHash3_x86_32_Update(MurmurHash3_x86_32_Context* ctx, const void* key, int len);
void MurmurHash3_x86_32_Final(void* out, const MurmurHash3_x86_32_Context* ctx);
struct MurmurHash3_x86_128_Context {
uint32_t h1;
uint32_t h2;
uint32_t h3;
uint32_t h4;
// Notice: may overflow, but fine.
int total_len;
int tail_len;
uint8_t tail[16];
};
void MurmurHash3_x86_128_Init(MurmurHash3_x86_128_Context* ctx, uint32_t seed);
void MurmurHash3_x86_128_Update(MurmurHash3_x86_128_Context* ctx, const void* key, int len);
void MurmurHash3_x86_128_Final(void* out, const MurmurHash3_x86_128_Context* ctx);
struct MurmurHash3_x64_128_Context {
uint64_t h1;
uint64_t h2;
// Notice:
// different from MurmurHash3_x86_128_Context where total_len is int.
// When total_len >= 2^31, this is also (slightly) different from
// MurmurHash3_x64_128() because len in the function is int.
uint64_t total_len;
int tail_len;
uint8_t tail[16];
};
void MurmurHash3_x64_128_Init(MurmurHash3_x64_128_Context* ctx, uint32_t seed);
void MurmurHash3_x64_128_Update(MurmurHash3_x64_128_Context* ctx, const void* key, int len);
void MurmurHash3_x64_128_Final(void* out, const MurmurHash3_x64_128_Context* ctx);
} // namespace butil
#endif // BUTIL_THIRD_PARTY_MURMURHASH3_MURMURHASH3_H