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diff --git a/package/inc/ThreadedDeflater.hxx b/package/inc/ThreadedDeflater.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_THREADEDDEFLATER_HXX
+#define INCLUDED_PACKAGE_THREADEDDEFLATER_HXX
+
+#include <com/sun/star/uno/Sequence.hxx>
+#include <package/packagedllapi.hxx>
+#include <comphelper/threadpool.hxx>
+#include <atomic>
+#include <memory>
+
+namespace ZipUtils
+{
+/// Parallel compression a stream using the libz deflate algorithm.
+///
+/// Almost a replacement for the Deflater class. Call startDeflate() with the data,
+/// check with finished() or waitForTasks() and retrieve result with getOutput().
+/// The class will internally split into multiple threads.
+class ThreadedDeflater final
+{
+    class Task;
+    // Note: All this should be lock-less. Each task writes only to its part
+    // of the data, flags are atomic.
+    css::uno::Sequence<sal_Int8> inBuffer;
+    int zlibLevel;
+    std::shared_ptr<comphelper::ThreadTaskTag> threadTaskTag;
+    std::atomic<int> pendingTasksCount;
+    std::vector<std::vector<sal_Int8>> outBuffers;
+
+public:
+    // Unlike with Deflater class, bNoWrap is always true.
+    ThreadedDeflater(sal_Int32 nSetLevel);
+    ~ThreadedDeflater();
+    void startDeflate(const css::uno::Sequence<sal_Int8>& rBuffer);
+    void waitForTasks();
+    bool finished() const;
+    css::uno::Sequence<sal_Int8> getOutput() const;
+    void clear();
+};
+
+} // namespace
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */