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diff --git a/i18npool/inc/indexentrysupplier_default.hxx b/i18npool/inc/indexentrysupplier_default.hxx
new file mode 100644
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+++ b/i18npool/inc/indexentrysupplier_default.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 .
+ */
+#pragma once
+
+#include "indexentrysupplier_common.hxx"
+
+#include <memory>
+#include <string_view>
+
+namespace i18npool {
+
+class Index;
+
+
+
+class IndexEntrySupplier_Unicode final : public IndexEntrySupplier_Common {
+public:
+    IndexEntrySupplier_Unicode( const css::uno::Reference < css::uno::XComponentContext >& rxContext );
+    virtual ~IndexEntrySupplier_Unicode() override;
+
+    virtual sal_Bool SAL_CALL loadAlgorithm(
+        const css::lang::Locale& rLocale,
+        const OUString& SortAlgorithm, sal_Int32 collatorOptions ) override;
+
+    virtual OUString SAL_CALL getIndexKey( const OUString& IndexEntry,
+        const OUString& PhoneticEntry, const css::lang::Locale& rLocale ) override;
+
+    virtual sal_Int16 SAL_CALL compareIndexEntry( const OUString& IndexEntry1,
+        const OUString& PhoneticEntry1, const css::lang::Locale& rLocale1,
+        const OUString& IndexEntry2, const OUString& PhoneticEntry2,
+        const css::lang::Locale& rLocale2 ) override;
+
+    virtual OUString SAL_CALL getIndexCharacter( const OUString& rIndexEntry,
+        const css::lang::Locale& rLocale, const OUString& rSortAlgorithm ) override;
+
+private:
+    std::unique_ptr<Index> index;
+};
+
+struct IndexKey {
+    sal_Unicode key;
+    OUString mkey;
+    OUString desc;
+};
+
+class IndexTable
+{
+public:
+    IndexTable();
+    ~IndexTable();
+
+    void init(sal_Unicode start_, sal_Unicode end_, IndexKey const * keys, sal_Int16 key_count, Index *index);
+
+    sal_Unicode start;
+    sal_Unicode end;
+    sal_uInt8 *table;
+};
+
+#define MAX_KEYS 0xff
+#define MAX_TABLES 20
+
+class Index
+{
+public:
+    Index(const css::uno::Reference < css::uno::XComponentContext >& rxContext);
+    ~Index();
+
+    /// @throws css::uno::RuntimeException
+    void init(const css::lang::Locale& rLocale, const OUString& algorithm);
+
+    /// @throws css::uno::RuntimeException
+    void makeIndexKeys(const css::lang::Locale &rLocale, std::u16string_view algorithm);
+    sal_Int16 getIndexWeight(const OUString& rIndexEntry);
+    OUString getIndexDescription(const OUString& rIndexEntry);
+
+    IndexTable tables[MAX_TABLES];
+    sal_Int16 table_count;
+    IndexKey keys[MAX_KEYS];
+    sal_Int16 key_count;
+    sal_Int16 mkeys[MAX_KEYS];
+    sal_Int16 mkey_count;
+    OUString skipping_chars;
+    rtl::Reference<CollatorImpl> collator;
+    sal_Int16 compare(sal_Unicode c1, sal_Unicode c2);
+};
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */