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diff --git a/include/comphelper/seekableinput.hxx b/include/comphelper/seekableinput.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_COMPHELPER_SEEKABLEINPUT_HXX
+#define INCLUDED_COMPHELPER_SEEKABLEINPUT_HXX
+
+#include <com/sun/star/uno/Reference.hxx>
+#include <com/sun/star/io/XInputStream.hpp>
+#include <com/sun/star/io/XSeekable.hpp>
+#include <cppuhelper/implbase.hxx>
+#include <comphelper/comphelperdllapi.h>
+#include <mutex>
+
+namespace com::sun::star::uno { class XComponentContext; }
+
+namespace comphelper
+{
+
+class SAL_DLLPUBLIC_TEMPLATE OSeekableInputWrapper_BASE
+    : public ::cppu::WeakImplHelper< css::io::XInputStream,
+                                     css::io::XSeekable >
+{};
+
+class COMPHELPER_DLLPUBLIC OSeekableInputWrapper final
+    : public OSeekableInputWrapper_BASE
+{
+    std::mutex    m_aMutex;
+
+    css::uno::Reference< css::uno::XComponentContext > m_xContext;
+
+    css::uno::Reference< css::io::XInputStream > m_xOriginalStream;
+
+    css::uno::Reference< css::io::XInputStream > m_xCopyInput;
+    css::uno::Reference< css::io::XSeekable > m_xCopySeek;
+
+private:
+    COMPHELPER_DLLPRIVATE void PrepareCopy_Impl();
+
+public:
+    OSeekableInputWrapper(
+                css::uno::Reference< css::io::XInputStream > xInStream,
+                css::uno::Reference< css::uno::XComponentContext > xContext );
+
+    virtual ~OSeekableInputWrapper() override;
+
+    static css::uno::Reference< css::io::XInputStream > CheckSeekableCanWrap(
+                        const css::uno::Reference< css::io::XInputStream >& xInStream,
+                        const css::uno::Reference< css::uno::XComponentContext >& rxContext );
+
+// 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;
+
+// XSeekable
+    virtual void SAL_CALL seek( sal_Int64 location ) override;
+    virtual sal_Int64 SAL_CALL getPosition() override;
+    virtual sal_Int64 SAL_CALL getLength() override;
+
+};
+
+}   // namespace comphelper
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */