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diff --git a/storage/mroonga/lib/mrn_index_table_name.hpp b/storage/mroonga/lib/mrn_index_table_name.hpp
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+++ b/storage/mroonga/lib/mrn_index_table_name.hpp
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+/* -*- c-basic-offset: 2 -*- */
+/*
+  Copyright(C) 2011 Kentoku SHIBA
+  Copyright(C) 2011-2015 Kouhei Sutou <kou@clear-code.com>
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  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
+*/
+
+#ifndef MRN_INDEX_TABLE_NAME_HPP_
+#define MRN_INDEX_TABLE_NAME_HPP_
+
+#include <mrn_constants.hpp>
+
+namespace mrn {
+  class IndexTableName {
+  public:
+    static const char *SEPARATOR;
+    static const char *OLD_SEPARATOR;
+
+    static bool is_custom_name(const char *table_name,
+                               size_t table_name_length,
+                               const char *index_table_name,
+                               size_t index_table_name_length);
+
+    IndexTableName(const char *table_name, const char *mysql_index_name);
+    const char *c_str();
+    size_t length();
+    const char *old_c_str();
+    size_t old_length();
+  private:
+    const char *table_name_;
+    const char *mysql_index_name_;
+    char old_name_[MRN_MAX_KEY_SIZE];
+    size_t old_length_;
+    char name_[MRN_MAX_KEY_SIZE];
+    size_t length_;
+
+    uint encode(uchar *encoded_start, uchar *encoded_end,
+                const uchar *mysql_string_start, const uchar *mysql_string_end);
+  };
+}
+
+#endif /* MRN_INDEX_TABLE_NAME_HPP_ */