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diff --git a/tools/qdoc3/archiveextractor.cpp b/tools/qdoc3/archiveextractor.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the tools applications of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, 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.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/*
+  archiveextractor.cpp
+*/
+
+#include "archiveextractor.h"
+
+QT_BEGIN_NAMESPACE
+
+QList<ArchiveExtractor *> ArchiveExtractor::extractors;
+
+/*!
+  \class ArchiveExtractor
+  
+  \brief The ArchiveExtractor class is a base class for classes that
+  know how to unpack a certain kind of archive file.
+
+  The archive extractor contains a list of the filename extensions
+  of the files that the archive extractor knows how to unpack.
+
+  It maintains a static list of all the instances of ArchiveExtractor
+  that have been created. It also has a static function for searching
+  that list to find the archive extracter for a file with a certain
+  extension.
+ */
+
+/*!
+  The constructor takes a list of filename extensions, which it
+  copies and saves internally. This archive extractor is prepended
+  to the static list.
+ */
+ArchiveExtractor::ArchiveExtractor( const QStringList& extensions )
+    : fileExts( extensions )
+{
+    extractors.prepend( this );
+}
+
+/*!
+  The destructor deletes all the filename extensions.
+ */
+ArchiveExtractor::~ArchiveExtractor()
+{
+    extractors.removeAll( this );
+}
+
+/*!
+  This function searches the static list of archive extractors
+  to find the first one that can handle \a fileName. If it finds
+  an acceptable extractor, it returns a pointer to it. Otherwise
+  it returns null.
+ */
+ArchiveExtractor*
+ArchiveExtractor::extractorForFileName( const QString& fileName )
+{
+    int dot = -1;
+    while ( (dot = fileName.indexOf(QLatin1Char('.'), dot + 1)) != -1 ) {
+        QString ext = fileName.mid( dot + 1 );
+        QList<ArchiveExtractor *>::ConstIterator e = extractors.begin();
+        while ( e != extractors.end() ) {
+            if ( (*e)->fileExtensions().contains(ext) )
+                return *e;
+            ++e;
+        }
+    }
+    return 0;
+}
+
+QT_END_NAMESPACE