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diff --git a/include/package/Deflater.hxx b/include/package/Deflater.hxx
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+++ b/include/package/Deflater.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_DEFLATER_HXX
+#define INCLUDED_PACKAGE_DEFLATER_HXX
+
+#include <com/sun/star/uno/Sequence.hxx>
+#include <package/packagedllapi.hxx>
+#include <memory>
+
+struct z_stream_s;
+
+namespace ZipUtils {
+
+class DLLPUBLIC_PACKAGE Deflater final
+{
+    typedef struct z_stream_s z_stream;
+
+    css::uno::Sequence< sal_Int8 > sInBuffer;
+    bool                    bFinish;
+    bool                    bFinished;
+    sal_Int64               nOffset, nLength;
+    // zlib total_in / total_out may be stored in 32bit, so they can overflow in case of 4gb files
+    sal_uInt64              nTotalOut64, nTotalIn64; // save the overflowed value here.
+    std::unique_ptr<z_stream> pStream;
+
+    void init (sal_Int32 nLevel, bool bNowrap);
+    sal_Int32 doDeflateBytes (css::uno::Sequence < sal_Int8 > &rBuffer, sal_Int32 nNewOffset, sal_Int32 nNewLength);
+
+public:
+    ~Deflater();
+    Deflater(sal_Int32 nSetLevel, bool bNowrap);
+    void setInputSegment( const css::uno::Sequence< sal_Int8 >& rBuffer );
+    bool needsInput() const;
+    void finish(  );
+    bool finished() const { return bFinished;}
+    sal_Int32 doDeflateSegment( css::uno::Sequence< sal_Int8 >& rBuffer, sal_Int32 nNewLength );
+    sal_Int64 getTotalIn() const;
+    sal_Int64 getTotalOut() const;
+    void reset(  );
+    void end(  );
+};
+
+}
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */