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diff --git a/svl/source/fsstor/ostreamcontainer.hxx b/svl/source/fsstor/ostreamcontainer.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_OSTREAMCONTAINER_HXX
+#define INCLUDED_SVL_SOURCE_FSSTOR_OSTREAMCONTAINER_HXX
+
+#include <com/sun/star/lang/XTypeProvider.hpp>
+#include <com/sun/star/embed/XExtendedStorageStream.hpp>
+#include <com/sun/star/io/XSeekable.hpp>
+#include <com/sun/star/io/XTruncate.hpp>
+#include <com/sun/star/io/XInputStream.hpp>
+#include <com/sun/star/io/XOutputStream.hpp>
+#include <com/sun/star/io/XStream.hpp>
+#include <com/sun/star/io/XAsyncOutputMonitor.hpp>
+#include <cppuhelper/weak.hxx>
+#include <comphelper/interfacecontainer4.hxx>
+#include <mutex>
+
+class OFSStreamContainer : public cppu::OWeakObject,
+                     public css::lang::XTypeProvider,
+                     public css::embed::XExtendedStorageStream,
+                     public css::io::XSeekable,
+                     public css::io::XInputStream,
+                     public css::io::XOutputStream,
+                     public css::io::XTruncate,
+                     public css::io::XAsyncOutputMonitor
+{
+    std::mutex m_aMutex;
+
+    css::uno::Reference< css::io::XStream >               m_xStream;
+    css::uno::Reference< css::io::XSeekable >             m_xSeekable;
+    css::uno::Reference< css::io::XInputStream >          m_xInputStream;
+    css::uno::Reference< css::io::XOutputStream >         m_xOutputStream;
+    css::uno::Reference< css::io::XTruncate >             m_xTruncate;
+    css::uno::Reference< css::io::XAsyncOutputMonitor >   m_xAsyncOutputMonitor;
+
+    bool m_bDisposed;
+    bool m_bInputClosed;
+    bool m_bOutputClosed;
+
+    ::comphelper::OInterfaceContainerHelper4<css::lang::XEventListener> m_aListenersContainer; // list of listeners
+    css::uno::Sequence<css::uno::Type> m_aTypes;
+
+public:
+    explicit OFSStreamContainer( const css::uno::Reference < css::io::XStream >& xStream );
+    virtual ~OFSStreamContainer() override;
+
+    // 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;
+
+    // XStream
+    virtual css::uno::Reference< css::io::XInputStream > SAL_CALL getInputStream(  ) override;
+    virtual css::uno::Reference< css::io::XOutputStream > SAL_CALL getOutputStream(  ) 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 >& aListener ) override;
+
+    // XSeekable
+    virtual void SAL_CALL seek( sal_Int64 location ) override;
+    virtual sal_Int64 SAL_CALL getPosition() override;
+    virtual sal_Int64 SAL_CALL getLength() override;
+
+    // XInputStream
+    virtual sal_Int32 SAL_CALL readBytes( css::uno::Sequence< sal_Int8 >& aData, sal_Int32 nBytesToRead ) override;
+    virtual sal_Int32 SAL_CALL readSomeBytes( css::uno::Sequence< sal_Int8 >& aData, sal_Int32 nMaxBytesToRead ) override;
+    virtual void SAL_CALL skipBytes( sal_Int32 nBytesToSkip ) override;
+    virtual sal_Int32 SAL_CALL available(  ) override;
+    virtual void SAL_CALL closeInput(  ) override;
+
+    // XOutputStream
+    virtual void SAL_CALL writeBytes( const css::uno::Sequence< sal_Int8 >& aData ) override;
+    virtual void SAL_CALL flush(  ) override;
+    virtual void SAL_CALL closeOutput(  ) override;
+
+    // XTruncate
+    virtual void SAL_CALL truncate() override;
+
+    // XAsyncOutputMonitor
+    virtual void SAL_CALL waitForCompletion(  ) override;
+
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */