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diff --git a/src/libs/installer/metadatajob_p.h b/src/libs/installer/metadatajob_p.h
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+++ b/src/libs/installer/metadatajob_p.h
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+/**************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** 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 Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/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 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+**************************************************************************/
+
+#ifndef METADATAJOB_P_H
+#define METADATAJOB_P_H
+
+#include "lib7z_facade.h"
+#include "metadatajob.h"
+
+namespace QInstaller{
+
+class UnzipArchiveException : public QException
+{
+public:
+    UnzipArchiveException() {}
+    ~UnzipArchiveException() throw() {}
+    explicit UnzipArchiveException(const QString &message)
+        : m_message(message)
+    {}
+
+    void raise() const { throw *this; }
+    QString message() const { return m_message; }
+    UnzipArchiveException *clone() const { return new UnzipArchiveException(*this); }
+
+private:
+    QString m_message;
+};
+
+class UnzipArchiveTask : public AbstractTask<void>
+{
+    Q_OBJECT
+    Q_DISABLE_COPY(UnzipArchiveTask)
+
+public:
+    UnzipArchiveTask(const QString &arcive, const QString &target)
+        : m_archive(arcive), m_targetDir(target)
+    {}
+    ~UnzipArchiveTask()
+    {
+        QFile file(m_archive);
+        if (!file.remove()) {
+            qWarning("Could not delete file %s: %s", qPrintable(m_archive), qPrintable(file
+                .errorString()));
+        }
+    }
+    void doTask(QFutureInterface<void> &fi)
+    {
+        fi.reportStarted();
+        fi.setExpectedResultCount(1);
+
+        if (fi.isCanceled()) {
+            fi.reportFinished();
+            return; // ignore already canceled
+        }
+
+        QFile archive(m_archive);
+        if (archive.open(QIODevice::ReadOnly)) {
+            try {
+                Lib7z::extractArchive(&archive, m_targetDir);
+            } catch (const Lib7z::SevenZipException& e) {
+                fi.reportException(UnzipArchiveException(MetadataJob::tr("Error while extracting "
+                    "'%1': %2").arg(m_archive, e.message())));
+            } catch (...) {
+                fi.reportException(UnzipArchiveException(MetadataJob::tr("Unknown exception "
+                    "caught while extracting %1.").arg(m_archive)));
+            }
+        } else {
+            fi.reportException(UnzipArchiveException(MetadataJob::tr("Could not open %1 for "
+                "reading. Error: %2").arg(m_archive, archive.errorString())));
+        }
+
+        fi.reportFinished();
+    }
+
+private:
+    QString m_archive;
+    QString m_targetDir;
+};
+
+}   // namespace QInstaller
+
+#endif  // METADATAJOB_P_H