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diff --git a/util/hash.h b/util/hash.h
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+++ b/util/hash.h
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+// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file. See the AUTHORS file for names of contributors.
+//
+// Simple hash function used for internal data structures
+
+#ifndef STORAGE_LEVELDB_UTIL_HASH_H_
+#define STORAGE_LEVELDB_UTIL_HASH_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+namespace leveldb {
+
+extern uint32_t Hash(const char* data, size_t n, uint32_t seed);
+
+}
+
+#endif  // STORAGE_LEVELDB_UTIL_HASH_H_