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diff --git a/storage/mroonga/vendor/groonga/lib/dat/file.hpp b/storage/mroonga/vendor/groonga/lib/dat/file.hpp
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+++ b/storage/mroonga/vendor/groonga/lib/dat/file.hpp
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+/* -*- c-basic-offset: 2 -*- */
+/*
+  Copyright(C) 2011-2016 Brazil
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License version 2.1 as published by the Free Software Foundation.
+
+  This library 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 GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1335  USA
+*/
+
+#pragma once
+
+#include "dat.hpp"
+
+namespace grn {
+namespace dat {
+
+// This implementation class hides environment dependent codes required for
+// memory-mapped I/O.
+class FileImpl;
+
+class GRN_DAT_API File {
+ public:
+  File();
+  ~File();
+
+  // This function creates a file and maps the entire file to a certain range
+  // of the address space. Note that a file is truncated if exists.
+  void create(const char *path, UInt64 size);
+
+  // This function opens a file and maps the entire file to a certain range of
+  // the address space.
+  void open(const char *path);
+  void close();
+
+  void *ptr() const;
+  UInt64 size() const;
+
+  void swap(File *rhs);
+
+  void flush();
+
+ private:
+  FileImpl *impl_;
+
+  // Disallows copy and assignment.
+  File(const File &);
+  File &operator=(const File &);
+};
+
+}  // namespace dat
+}  // namespace grn