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diff --git a/i18npool/inc/textconversion.hxx b/i18npool/inc/textconversion.hxx
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+++ b/i18npool/inc/textconversion.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 <com/sun/star/lang/XServiceInfo.hpp>
+#include <com/sun/star/i18n/XExtendedTextConversion.hpp>
+#include <cppuhelper/implbase.hxx>
+#include <osl/module.h>
+
+namespace com::sun::star::linguistic2 { class XConversionDictionary; }
+namespace com::sun::star::linguistic2 { class XConversionDictionaryList; }
+namespace com::sun::star::uno { class XComponentContext; }
+
+namespace i18npool {
+
+
+
+class TextConversionService: public cppu::WeakImplHelper
+<
+    css::i18n::XExtendedTextConversion,
+    css::lang::XServiceInfo
+>
+{
+public:
+        TextConversionService(const char* pImplName);
+        virtual ~TextConversionService() override;
+        // Methods
+        virtual css::i18n::TextConversionResult SAL_CALL
+        getConversions( const OUString& aText, sal_Int32 nStartPos, sal_Int32 nLength,
+            const css::lang::Locale& aLocale, sal_Int16 nTextConversionType,
+            sal_Int32 nTextConversionOptions ) override = 0;
+        virtual OUString SAL_CALL
+        getConversion( const OUString& aText, sal_Int32 nStartPos, sal_Int32 nLength,
+            const css::lang::Locale& aLocale, sal_Int16 nTextConversionType,
+            sal_Int32 nTextConversionOptions ) override = 0;
+        virtual OUString SAL_CALL
+        getConversionWithOffset( const OUString& aText, sal_Int32 nStartPos, sal_Int32 nLength,
+            const css::lang::Locale& aLocale, sal_Int16 nTextConversionType,
+            sal_Int32 nTextConversionOptions, css::uno::Sequence< sal_Int32 >& offset ) override = 0;
+        virtual sal_Bool SAL_CALL
+        interactiveConversion(const css::lang::Locale& aLocale,
+            sal_Int16 nTextConversionType, sal_Int32 nTextConversionOptions ) override = 0;
+
+    //XServiceInfo
+    OUString SAL_CALL
+        getImplementationName() override;
+    sal_Bool SAL_CALL
+        supportsService(const OUString& ServiceName) override;
+    css::uno::Sequence< OUString > SAL_CALL
+        getSupportedServiceNames() override;
+private:
+    const char* implementationName;
+protected:
+#ifndef DISABLE_DYNLOADING
+    oslModule hModule;
+    oslGenericFunction getFunctionBySymbol(const char* func);
+#endif
+};
+
+// for Hangul2Hanja conversion
+typedef struct {
+    sal_Unicode code;
+    sal_Int16 address;
+    sal_Int16 count;
+} Hangul_Index;
+
+
+
+class TextConversion_ko final : public TextConversionService
+{
+public:
+    TextConversion_ko( const css::uno::Reference < css::uno::XComponentContext >& rxContext );
+
+        // Methods
+        css::i18n::TextConversionResult SAL_CALL
+        getConversions( const OUString& aText, sal_Int32 nStartPos, sal_Int32 nLength,
+            const css::lang::Locale& aLocale, sal_Int16 nTextConversionType,
+            sal_Int32 nTextConversionOptions ) override;
+        OUString SAL_CALL
+        getConversion( const OUString& aText, sal_Int32 nStartPos, sal_Int32 nLength,
+            const css::lang::Locale& aLocale, sal_Int16 nTextConversionType,
+            sal_Int32 nTextConversionOptions ) override;
+        OUString SAL_CALL
+        getConversionWithOffset( const OUString& aText, sal_Int32 nStartPos, sal_Int32 nLength,
+            const css::lang::Locale& aLocale, sal_Int16 nTextConversionType,
+            sal_Int32 nTextConversionOptions, css::uno::Sequence< sal_Int32 >& offset ) override;
+        sal_Bool SAL_CALL
+        interactiveConversion(const css::lang::Locale& aLocale,
+            sal_Int16 nTextConversionType,
+            sal_Int32 nTextConversionOptions ) override;
+
+private:
+        // Hangul/Hanja system dictionary
+        css::uno::Reference < css::linguistic2::XConversionDictionary > xCD;
+        // Hangul/Hanja user defined dictionary list
+        css::uno::Reference < css::linguistic2::XConversionDictionaryList > xCDL;
+        sal_Int32 maxLeftLength;
+        sal_Int32 maxRightLength;
+        css::uno::Sequence< OUString >
+            getCharConversions(const OUString& aText, sal_Int32 nStartPos, sal_Int32 nLength, bool toHanja);
+};
+
+
+
+
+// for SChines/TChinese word conversion
+typedef struct {
+    sal_Int16 count;
+} STC_WordIndex;
+
+class TextConversion_zh final : public TextConversionService
+{
+public:
+    TextConversion_zh( const css::uno::Reference < css::uno::XComponentContext >& rxContext );
+
+        // Methods
+        css::i18n::TextConversionResult SAL_CALL
+        getConversions( const OUString& aText, sal_Int32 nStartPos, sal_Int32 nLength,
+            const css::lang::Locale& aLocale, sal_Int16 nTextConversionType,
+            sal_Int32 nTextConversionOptions ) override;
+        OUString SAL_CALL
+        getConversion( const OUString& aText, sal_Int32 nStartPos, sal_Int32 nLength,
+            const css::lang::Locale& aLocale, sal_Int16 nTextConversionType,
+            sal_Int32 nTextConversionOptions ) override;
+        OUString SAL_CALL
+        getConversionWithOffset( const OUString& aText, sal_Int32 nStartPos, sal_Int32 nLength,
+            const css::lang::Locale& aLocale, sal_Int16 nTextConversionType,
+            sal_Int32 nTextConversionOptions, css::uno::Sequence< sal_Int32 >& offset ) override;
+        sal_Bool SAL_CALL
+        interactiveConversion(const css::lang::Locale& aLocale,
+            sal_Int16 nTextConversionType,
+            sal_Int32 nTextConversionOptions ) override;
+private:
+        // user defined dictionary list
+        css::uno::Reference < css::linguistic2::XConversionDictionaryList > xCDL;
+        OUString getWordConversion(const OUString& aText,
+            sal_Int32 nStartPos, sal_Int32 nLength, bool toSChinese, sal_Int32 nConversionOptions, css::uno::Sequence <sal_Int32>& offset);
+        rtl:: OUString getCharConversion(const rtl:: OUString& aText, sal_Int32 nStartPos, sal_Int32 nLength, bool toSChinese, sal_Int32 nConversionOptions);
+        css::lang::Locale aLocale;
+};
+
+} // i18npool
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */