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diff --git a/include/i18nutil/casefolding.hxx b/include/i18nutil/casefolding.hxx
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+++ b/include/i18nutil/casefolding.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_CASEFOLDING_HXX
+#define INCLUDED_I18NUTIL_CASEFOLDING_HXX
+
+#include <sal/types.h>
+#include <i18nutil/i18nutildllapi.h>
+#include <o3tl/typed_flags_set.hxx>
+#include <config_options.h>
+
+namespace com::sun::star::lang { struct Locale; }
+
+enum class TransliterationFlags;
+
+enum class MappingType {
+    NONE             = 0x00,
+    LowerToUpper     = 0x01,  // Upper to Lower mapping
+    UpperToLower     = 0x02,  // Lower to Upper mapping
+    ToUpper          = 0x04,  // to Upper mapping
+    ToLower          = 0x08,  // to Lower mapping
+    ToTitle          = 0x10,  // to Title mapping
+    SimpleFolding    = 0x20,  // Simple Case Folding
+    FullFolding      = 0x40,  // Full Case Folding
+    // for final sigma (where the case-mapping is different for the last letter of a word)
+    CasedLetterMask  = LowerToUpper | UpperToLower | ToUpper | ToLower | ToTitle | SimpleFolding | FullFolding,
+    NotValue         = 0x80,  // Value field is an address
+};
+namespace o3tl {
+    template<> struct typed_flags<MappingType> : is_typed_flags<MappingType, 0xff> {};
+}
+
+namespace i18nutil {
+
+struct Value
+{
+    sal_uInt8   type;
+    sal_uInt16  value;  // value or address, depend on the type
+};
+
+struct Mapping
+{
+    sal_uInt8   type;
+    sal_Int8    nmap;
+#define NMAPPINGMAX 3
+    sal_Unicode map[NMAPPINGMAX];
+};      // for Unconditional mapping
+
+struct MappingElement
+{
+    MappingElement()
+        : current(0)
+    {
+        element.type = element.nmap = 0;
+    }
+    Mapping element;
+    sal_Int8 current;
+};
+
+class UNLESS_MERGELIBS(I18NUTIL_DLLPUBLIC) casefolding
+{
+public:
+    /// @throws css::uno::RuntimeException
+    static Mapping getValue(const sal_Unicode* str, sal_Int32 pos, sal_Int32 len, css::lang::Locale const & aLocale, MappingType nMappingType);
+    /// @throws css::uno::RuntimeException
+    static const Mapping& getConditionalValue(const sal_Unicode* str, sal_Int32 pos, sal_Int32 len, css::lang::Locale const & aLocale, MappingType nMappingType);
+    /// @throws css::uno::RuntimeException
+    static sal_Unicode getNextChar(const sal_Unicode *str, sal_Int32& idx, sal_Int32 len, MappingElement& e, css::lang::Locale const & aLocale, MappingType nMappingtype, TransliterationFlags moduleLoaded);
+
+};
+
+}
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */