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diff --git a/svl/source/fsstor/fsstorage.hxx b/svl/source/fsstor/fsstorage.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_SVL_SOURCE_FSSTOR_FSSTORAGE_HXX
+#define INCLUDED_SVL_SOURCE_FSSTOR_FSSTORAGE_HXX
+
+#include <com/sun/star/uno/Sequence.hxx>
+#include <com/sun/star/embed/XStorage.hpp>
+#include <com/sun/star/embed/XHierarchicalStorageAccess.hpp>
+#include <com/sun/star/io/XStream.hpp>
+#include <com/sun/star/beans/XPropertySet.hpp>
+#include <com/sun/star/lang/XTypeProvider.hpp>
+#include <com/sun/star/uno/XComponentContext.hpp>
+#include <comphelper/interfacecontainer3.hxx>
+#include <cppuhelper/weak.hxx>
+
+#include <ucbhelper/content.hxx>
+
+class FSStorage : public css::lang::XTypeProvider
+                , public css::embed::XStorage
+                , public css::embed::XHierarchicalStorageAccess
+                , public css::beans::XPropertySet
+                , public ::cppu::OWeakObject
+{
+    ::osl::Mutex m_aMutex;
+    OUString  m_aURL;
+    ::ucbhelper::Content m_aContent;
+    sal_Int32 m_nMode;
+    std::unique_ptr<::comphelper::OInterfaceContainerHelper3<css::lang::XEventListener>> m_pListenersContainer; // list of listeners
+    css::uno::Reference< css::uno::XComponentContext > m_xContext;
+
+public:
+
+    FSStorage(  const ::ucbhelper::Content& aContent,
+                sal_Int32 nMode,
+                css::uno::Reference< css::uno::XComponentContext > const & xContext );
+
+    virtual ~FSStorage() override;
+
+    ucbhelper::Content& GetContent();
+
+    static void CopyStreamToSubStream( const OUString& aSourceURL,
+                                const css::uno::Reference< css::embed::XStorage >& xDest,
+                                const OUString& aNewEntryName );
+
+    void CopyContentToStorage_Impl(ucbhelper::Content& rContent,
+                                   const css::uno::Reference<css::embed::XStorage>& xDest);
+
+    static bool MakeFolderNoUI( std::u16string_view rFolder );
+
+    //  XInterface
+
+    virtual css::uno::Any SAL_CALL queryInterface( const css::uno::Type& rType ) override;
+
+    virtual void SAL_CALL acquire() noexcept override;
+
+    virtual void SAL_CALL release() noexcept override;
+
+    //  XTypeProvider
+
+    virtual css::uno::Sequence< css::uno::Type > SAL_CALL getTypes() override;
+
+    virtual css::uno::Sequence< sal_Int8 > SAL_CALL getImplementationId() override;
+
+    //  XStorage
+
+    virtual void SAL_CALL copyToStorage( const css::uno::Reference< css::embed::XStorage >& xDest ) override;
+
+    virtual css::uno::Reference< css::io::XStream > SAL_CALL openStreamElement(
+            const OUString& aStreamName, sal_Int32 nOpenMode ) override;
+
+    virtual css::uno::Reference< css::io::XStream > SAL_CALL openEncryptedStreamElement(
+            const OUString& aStreamName, sal_Int32 nOpenMode, const OUString& aPass ) override;
+
+    virtual css::uno::Reference< css::embed::XStorage > SAL_CALL openStorageElement(
+            const OUString& aStorName, sal_Int32 nStorageMode ) override;
+
+    virtual css::uno::Reference< css::io::XStream > SAL_CALL cloneStreamElement(
+            const OUString& aStreamName ) override;
+
+    virtual css::uno::Reference< css::io::XStream > SAL_CALL cloneEncryptedStreamElement(
+            const OUString& aStreamName, const OUString& aPass ) override;
+
+    virtual void SAL_CALL copyLastCommitTo(
+            const css::uno::Reference< css::embed::XStorage >& xTargetStorage ) override;
+
+    virtual void SAL_CALL copyStorageElementLastCommitTo(
+            const OUString& aStorName,
+            const css::uno::Reference< css::embed::XStorage >& xTargetStorage ) override;
+
+    virtual sal_Bool SAL_CALL isStreamElement( const OUString& aElementName ) override;
+
+    virtual sal_Bool SAL_CALL isStorageElement( const OUString& aElementName ) override;
+
+    virtual void SAL_CALL removeElement( const OUString& aElementName ) override;
+
+    virtual void SAL_CALL renameElement( const OUString& rEleName, const OUString& rNewName ) override;
+
+    virtual void SAL_CALL copyElementTo(    const OUString& aElementName,
+                                        const css::uno::Reference< css::embed::XStorage >& xDest,
+                                        const OUString& aNewName ) override;
+
+    virtual void SAL_CALL moveElementTo(    const OUString& aElementName,
+                                        const css::uno::Reference< css::embed::XStorage >& xDest,
+                                        const OUString& rNewName ) override;
+
+    //  XNameAccess
+
+    virtual css::uno::Any SAL_CALL getByName( const OUString& aName ) override;
+
+    virtual css::uno::Sequence< OUString > SAL_CALL getElementNames() override;
+
+    virtual sal_Bool SAL_CALL hasByName( const OUString& aName ) override;
+
+    virtual css::uno::Type SAL_CALL getElementType() override;
+
+    virtual sal_Bool SAL_CALL hasElements() override;
+
+    //  XComponent
+
+    virtual void SAL_CALL dispose() override;
+
+    virtual void SAL_CALL addEventListener(
+            const css::uno::Reference< css::lang::XEventListener >& xListener ) override;
+
+    virtual void SAL_CALL removeEventListener(
+            const css::uno::Reference< css::lang::XEventListener >& xListener ) override;
+
+    //  XPropertySet
+
+    virtual css::uno::Reference< css::beans::XPropertySetInfo > SAL_CALL getPropertySetInfo() override;
+
+    virtual void SAL_CALL setPropertyValue( const OUString& aPropertyName, const css::uno::Any& aValue ) override;
+
+    virtual css::uno::Any SAL_CALL getPropertyValue( const OUString& PropertyName ) override;
+
+    virtual void SAL_CALL addPropertyChangeListener(
+            const OUString& aPropertyName,
+            const css::uno::Reference< css::beans::XPropertyChangeListener >& xListener ) override;
+
+    virtual void SAL_CALL removePropertyChangeListener(
+            const OUString& aPropertyName,
+            const css::uno::Reference< css::beans::XPropertyChangeListener >& aListener ) override;
+
+    virtual void SAL_CALL addVetoableChangeListener(
+            const OUString& PropertyName,
+            const css::uno::Reference< css::beans::XVetoableChangeListener >& aListener ) override;
+
+    virtual void SAL_CALL removeVetoableChangeListener( const OUString& PropertyName, const css::uno::Reference< css::beans::XVetoableChangeListener >& aListener ) override;
+
+    //  XHierarchicalStorageAccess
+
+    virtual css::uno::Reference< css::embed::XExtendedStorageStream > SAL_CALL openStreamElementByHierarchicalName( const OUString& sStreamPath, ::sal_Int32 nOpenMode ) override;
+
+    virtual css::uno::Reference< css::embed::XExtendedStorageStream > SAL_CALL openEncryptedStreamElementByHierarchicalName( const OUString& sStreamName, ::sal_Int32 nOpenMode, const OUString& sPassword ) override;
+
+    virtual void SAL_CALL removeStreamElementByHierarchicalName( const OUString& sElementPath ) override;
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */