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diff --git a/shell/inc/zipfile.hxx b/shell/inc/zipfile.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_SHELL_INC_INTERNAL_ZIPFILE_HXX
+#define INCLUDED_SHELL_INC_INTERNAL_ZIPFILE_HXX
+
+#include <zlib.h>
+
+#include <string>
+#include <vector>
+#include <memory>
+#include "filepath.hxx"
+
+class StreamInterface;
+
+/** A simple zip content provider based on the zlib
+*/
+
+class ZipFile
+{
+public:
+    typedef std::vector<std::string>   Directory_t;
+    typedef std::unique_ptr<Directory_t> DirectoryPtr_t;
+    typedef std::vector<char>          ZipContentBuffer_t;
+
+public:
+
+    /** Checks whether a file is a zip file or not
+
+    @precond    The given parameter must be a string with length > 0
+            The file must exist
+            The file must be readable for the current user
+
+    @returns    true if the file is a zip file
+            false if the file is not a zip file
+
+    @throws ParameterException if the given file name is empty
+            IOException if the specified file doesn't exist
+            AccessViolationException if read access to the file is denied
+    */
+    static bool IsZipFile(const Filepath_t &FileName);
+
+    static bool IsZipFile(void *stream);
+
+
+    /** Returns whether the version of the specified zip file may be uncompressed with the
+          currently used zlib version or not
+
+    @precond    The given parameter must be a string with length > 0
+            The file must exist
+            The file must be readable for the current user
+            The file must be a valid zip file
+
+    @returns    true if the file may be uncompressed with the currently used zlib
+            false if the file may not be uncompressed with the currently used zlib
+
+    @throws ParameterException if the given file name is empty
+            IOException if the specified file doesn't exist or is no zip file
+            AccessViolationException if read access to the file is denied
+    */
+    static bool IsValidZipFileVersionNumber(const Filepath_t &FileName);
+
+    static bool IsValidZipFileVersionNumber(void *stream);
+
+public:
+
+    /** Constructs a zip file from a zip file
+
+    @precond    The given parameter must be a string with length > 0
+            The file must exist
+            The file must be readable for the current user
+
+    @throws ParameterException if the given file name is empty
+            IOException if the specified file doesn't exist or is no valid zip file
+            AccessViolationException if read access to the file is denied
+            WrongZipVersionException if the zip file cannot be uncompressed
+            with the used zlib version
+    */
+    ZipFile(const Filepath_t &FileName);
+
+    ZipFile(StreamInterface *stream);
+
+
+    /** Destroys a zip file
+    */
+    ~ZipFile();
+
+    /** Provides an interface to read the uncompressed data of a content of the zip file
+
+    @param      ContentName
+                The name of the content in the zip file
+
+    @param      ppstm
+                Pointer to pointer, will receive an interface pointer
+                to IUnknown on success
+
+    @precond    The specified content must exist in this file
+                ppstm must not be NULL
+
+    @throws     std::bad_alloc if the necessary buffer could not be
+                allocated
+                ZipException if a zip error occurs
+                ZipContentMissException if the specified zip content
+                does not exist in this zip file
+    */
+    void GetUncompressedContent(const std::string &ContentName, /*inout*/ ZipContentBuffer_t &ContentBuffer);
+
+    /** Returns a list with the content names contained within this file
+
+        @throws ZipException if an error in the zlib happens
+    */
+    DirectoryPtr_t GetDirectory() const;
+
+    /** Convenience query function may even realized with
+        iterating over a ZipFileDirectory returned by
+        GetDirectory
+    */
+    bool HasContent(const std::string &ContentName) const;
+
+private:
+
+    /** Returns the length of the longest file name
+        in the current zip file
+
+        @throws ZipException if a zip error occurs
+    */
+    long GetFileLongestFileNameLength() const;
+
+private:
+    StreamInterface *m_pStream;
+    bool m_bShouldFree;
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */