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diff --git a/src/libs/installer/lib7z_extract.h b/src/libs/installer/lib7z_extract.h
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+/**************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the Qt Installer Framework.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file. Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** As a special exception, The Qt Company gives you certain additional
+** rights. These rights are described in The Qt Company LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+**
+** $QT_END_LICENSE$
+**
+**************************************************************************/
+#ifndef LIB7Z_EXTRACT_H
+#define LIB7Z_EXTRACT_H
+
+#include "installer_global.h"
+
+#include <Common/MyCom.h>
+#include <7zip/Archive/IArchive.h>
+
+#include <QString>
+
+class CArc;
+
+QT_BEGIN_NAMESPACE
+class QFileDevice;
+QT_END_NAMESPACE
+
+namespace Lib7z
+{
+    class INSTALLER_EXPORT ExtractCallback : public IArchiveExtractCallback, public CMyUnknownImp
+    {
+        Q_DISABLE_COPY(ExtractCallback)
+
+    public:
+        ExtractCallback() = default;
+        virtual ~ExtractCallback() = default;
+
+        void setArchive(CArc *carc) { arc = carc; }
+        void setTarget(const QString &dir) { targetDir = dir; }
+
+        MY_UNKNOWN_IMP
+        INTERFACE_IArchiveExtractCallback(;)
+
+    protected:
+        virtual bool prepareForFile(const QString & /*filename*/) { return true; }
+        virtual void setCurrentFile(const QString &filename) { Q_UNUSED(filename) }
+        virtual HRESULT setCompleted(quint64 /*completed*/, quint64 /*total*/) { return S_OK; }
+
+    private:
+        CArc *arc = 0;
+
+        QString targetDir;
+        quint64 total = 0;
+        quint64 completed = 0;
+        quint32 currentIndex = 0;
+    };
+
+    void INSTALLER_EXPORT extractArchive(QFileDevice *archive, const QString &targetDirectory,
+        ExtractCallback *callback = 0);
+
+} // namespace Lib7z
+
+#endif // LIB7Z_EXTRACT_H