hash.h 1.1 KB
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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

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#ifndef BUTIL_HASH_H_
#define BUTIL_HASH_H_
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#include <limits>
#include <string>

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#include "butil/base_export.h"
#include "butil/basictypes.h"
#include "butil/logging.h"
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namespace butil {
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// WARNING: This hash function should not be used for any cryptographic purpose.
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BUTIL_EXPORT uint32_t SuperFastHash(const char* data, int len);
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// Computes a hash of a memory buffer |data| of a given |length|.
// WARNING: This hash function should not be used for any cryptographic purpose.
inline uint32_t Hash(const char* data, size_t length) {
  if (length > static_cast<size_t>(std::numeric_limits<int>::max())) {
    NOTREACHED();
    return 0;
  }
  return SuperFastHash(data, static_cast<int>(length));
}

// Computes a hash of a string |str|.
// WARNING: This hash function should not be used for any cryptographic purpose.
inline uint32_t Hash(const std::string& str) {
  return Hash(str.data(), str.size());
}

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}  // namespace butil
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#endif  // BUTIL_HASH_H_