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diff --git a/include/oox/helper/zipstorage.hxx b/include/oox/helper/zipstorage.hxx
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+++ b/include/oox/helper/zipstorage.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 OOX_HELPER_ZIPSTORAGE_HXX
+#define OOX_HELPER_ZIPSTORAGE_HXX
+
+#include "oox/helper/storagebase.hxx"
+
+namespace com { namespace sun { namespace star {
+    namespace uno { class XComponentContext; }
+} } }
+
+namespace oox {
+
+// ============================================================================
+
+/** Implements stream access for ZIP storages containing XML streams. */
+class ZipStorage : public StorageBase
+{
+public:
+    explicit            ZipStorage(
+                            const ::com::sun::star::uno::Reference< ::com::sun::star::uno::XComponentContext >& rxContext,
+                            const ::com::sun::star::uno::Reference< ::com::sun::star::io::XInputStream >& rxInStream );
+
+    explicit            ZipStorage(
+                            const ::com::sun::star::uno::Reference< ::com::sun::star::uno::XComponentContext >& rxContext,
+                            const ::com::sun::star::uno::Reference< ::com::sun::star::io::XStream >& rxStream );
+
+    virtual             ~ZipStorage();
+
+private:
+    explicit            ZipStorage(
+                            const ZipStorage& rParentStorage,
+                            const ::com::sun::star::uno::Reference< ::com::sun::star::embed::XStorage >& rxStorage,
+                            const OUString& rElementName );
+
+    /** Returns true, if the object represents a valid storage. */
+    virtual bool        implIsStorage() const;
+
+    /** Returns the com.sun.star.embed.XStorage interface of the current storage. */
+    virtual ::com::sun::star::uno::Reference< ::com::sun::star::embed::XStorage >
+                        implGetXStorage() const;
+
+    /** Returns the names of all elements of this storage. */
+    virtual void        implGetElementNames( ::std::vector< OUString >& orElementNames ) const;
+
+    /** Opens and returns the specified sub storage from the storage. */
+    virtual StorageRef  implOpenSubStorage( const OUString& rElementName, bool bCreateMissing );
+
+    /** Opens and returns the specified input stream from the storage. */
+    virtual ::com::sun::star::uno::Reference< ::com::sun::star::io::XInputStream >
+                        implOpenInputStream( const OUString& rElementName );
+
+    /** Opens and returns the specified output stream from the storage. */
+    virtual ::com::sun::star::uno::Reference< ::com::sun::star::io::XOutputStream >
+                        implOpenOutputStream( const OUString& rElementName );
+
+    /** Commits the current storage. */
+    virtual void        implCommit() const;
+
+private:
+    ::com::sun::star::uno::Reference< ::com::sun::star::embed::XStorage >
+                        mxStorage;      ///< Storage based on input or output stream.
+};
+
+// ============================================================================
+
+} // namespace oox
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */