//  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