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diff --git a/include/i18nutil/oneToOneMapping.hxx b/include/i18nutil/oneToOneMapping.hxx
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+++ b/include/i18nutil/oneToOneMapping.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+#ifndef INCLUDED_I18NUTIL_ONETOONEMAPPING_HXX
+#define INCLUDED_I18NUTIL_ONETOONEMAPPING_HXX
+
+#include <i18nutil/i18nutildllapi.h>
+#include <memory>
+#include <config_options.h>
+
+namespace i18nutil {
+
+struct OneToOneMappingTable_t
+{
+    sal_Unicode first;
+    sal_Unicode second;
+};
+
+typedef sal_Int8 UnicodePairFlag;
+struct UnicodePairWithFlag
+{
+    sal_Unicode first;
+    sal_Unicode second;
+    UnicodePairFlag flag;
+};
+
+class UNLESS_MERGELIBS(I18NUTIL_DLLPUBLIC) oneToOneMapping
+{
+private:
+    oneToOneMapping(const oneToOneMapping&) = delete;
+    oneToOneMapping& operator=(const oneToOneMapping&) = delete;
+public:
+    oneToOneMapping( OneToOneMappingTable_t const *rpTable, const size_t rnSize, const size_t rnUnitSize = sizeof(OneToOneMappingTable_t) );
+    virtual ~oneToOneMapping();
+
+    // binary search
+    virtual sal_Unicode find( const sal_Unicode nKey ) const;
+
+    // translator
+    sal_Unicode operator[] ( const sal_Unicode nKey ) const { return find( nKey ); };
+
+protected:
+    OneToOneMappingTable_t const *mpTable;
+    size_t                  mnSize;
+};
+
+class oneToOneMappingWithFlag final : public oneToOneMapping
+{
+private:
+    oneToOneMappingWithFlag(const oneToOneMappingWithFlag&) = delete;
+    oneToOneMappingWithFlag& operator=(const oneToOneMappingWithFlag&) = delete;
+
+    friend class widthfolding;
+
+public:
+    oneToOneMappingWithFlag( UnicodePairWithFlag const *rpTableWF, const size_t rnSize, const UnicodePairFlag rnFlag );
+    virtual ~oneToOneMappingWithFlag() override;
+
+    // make index for fast search
+    void makeIndex();
+
+    // index search
+    virtual sal_Unicode find( const sal_Unicode nKey ) const override;
+private:
+    UnicodePairWithFlag const *mpTableWF;
+    UnicodePairFlag       mnFlag;
+    std::unique_ptr<UnicodePairWithFlag const *[]> mpIndex[256];
+    bool                  mbHasIndex;
+};
+
+}
+
+#endif // _I18N_TRANSLITERATION_ONETOONEMAPPING_HXX_
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */