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diff --git a/package/source/xstor/switchpersistencestream.hxx b/package/source/xstor/switchpersistencestream.hxx
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+++ b/package/source/xstor/switchpersistencestream.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_PACKAGE_SOURCE_XSTOR_SWITCHPERSISTENCESTREAM_HXX
+#define INCLUDED_PACKAGE_SOURCE_XSTOR_SWITCHPERSISTENCESTREAM_HXX
+
+#include <com/sun/star/uno/Sequence.hxx>
+#include <com/sun/star/uno/Reference.hxx>
+#include <com/sun/star/uno/XComponentContext.hpp>
+#include <com/sun/star/io/XInputStream.hpp>
+#include <com/sun/star/io/XOutputStream.hpp>
+#include <com/sun/star/io/XSeekable.hpp>
+#include <com/sun/star/io/XTruncate.hpp>
+#include <com/sun/star/io/XStream.hpp>
+#include <com/sun/star/io/XAsyncOutputMonitor.hpp>
+#include <mutex>
+#include <cppuhelper/implbase.hxx>
+
+// SwitchablePersistenceStream
+
+// Allows to switch the stream persistence on the fly. The target
+// stream ( if not filled by the implementation ) MUST have the same
+// size as the original one!
+
+struct SPStreamData_Impl;
+class SwitchablePersistenceStream
+        : public ::cppu::WeakImplHelper <
+                                        css::io::XStream,
+                                        css::io::XInputStream,
+                                        css::io::XOutputStream,
+                                        css::io::XTruncate,
+                                        css::io::XSeekable,
+                                        css::io::XAsyncOutputMonitor >
+{
+    std::mutex    m_aMutex;
+
+    const css::uno::Reference< css::uno::XComponentContext > m_xContext;
+
+    std::unique_ptr<SPStreamData_Impl> m_pStreamData;
+
+    void CloseAll_Impl();
+
+public:
+
+    SwitchablePersistenceStream(
+        const css::uno::Reference< css::uno::XComponentContext >& xContext,
+        const css::uno::Reference< css::io::XStream >& xStream );
+
+    SwitchablePersistenceStream(
+        const css::uno::Reference< css::uno::XComponentContext >& xContext,
+        const css::uno::Reference< css::io::XInputStream >& xInStream );
+
+    virtual ~SwitchablePersistenceStream() override;
+
+    void SwitchPersistenceTo( const css::uno::Reference< css::io::XStream >& xStream );
+
+    void SwitchPersistenceTo( const css::uno::Reference< css::io::XInputStream >& xInputStream );
+
+    void CopyAndSwitchPersistenceTo( const css::uno::Reference< css::io::XStream >& xStream );
+
+// css::io::XStream
+    virtual css::uno::Reference< css::io::XInputStream > SAL_CALL getInputStream(  ) override;
+    virtual css::uno::Reference< css::io::XOutputStream > SAL_CALL getOutputStream(  ) override;
+
+// css::io::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;
+
+// css::io::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;
+
+// css::io::XTruncate
+    virtual void SAL_CALL truncate(  ) override;
+
+// css::io::XSeekable
+    virtual void SAL_CALL seek( ::sal_Int64 location ) override;
+    virtual ::sal_Int64 SAL_CALL getPosition(  ) override;
+    virtual ::sal_Int64 SAL_CALL getLength(  ) override;
+
+// css::io::XAsyncOutputMonitor
+    virtual void SAL_CALL waitForCompletion(  ) override;
+
+};
+
+#endif // INCLUDED_PACKAGE_SOURCE_XSTOR_SWITCHPERSISTENCESTREAM_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */