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diff --git a/src/network/access/qnetworkdiskcache_p.h b/src/network/access/qnetworkdiskcache_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtNetwork module 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 Technology Preview License Agreement accompanying
+** this package.
+**
+** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QNETWORKDISKCACHE_P_H
+#define QNETWORKDISKCACHE_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include "private/qabstractnetworkcache_p.h"
+
+#include <qbuffer.h>
+#include <qhash.h>
+#include <qtemporaryfile.h>
+
+#ifndef QT_NO_NETWORKDISKCACHE
+
+QT_BEGIN_NAMESPACE
+
+class QFile;
+
+class QCacheItem
+{
+public:
+    QCacheItem() : file(0)
+    {
+    }
+    ~QCacheItem()
+    {
+        reset();
+    }
+
+    QNetworkCacheMetaData metaData;
+    QBuffer data;
+    QTemporaryFile *file;
+    inline qint64 size() const
+        { return file ? file->size() : data.size(); }
+
+    inline void reset() {
+        metaData = QNetworkCacheMetaData();
+        data.close();
+        delete file;
+        file = 0;
+    }
+    void writeHeader(QFile *device) const;
+    void writeCompressedData(QFile *device) const;
+    bool read(QFile *device, bool readData);
+
+    bool canCompress() const;
+};
+
+class QNetworkDiskCachePrivate : public QAbstractNetworkCachePrivate
+{
+public:
+    QNetworkDiskCachePrivate()
+        : QAbstractNetworkCachePrivate()
+        , maximumCacheSize(1024 * 1024 * 50)
+        , currentCacheSize(-1)
+        {}
+
+    static QString uniqueFileName(const QUrl &url);
+    QString cacheFileName(const QUrl &url) const;
+    QString tmpCacheFileName() const;
+    bool removeFile(const QString &file);
+    void storeItem(QCacheItem *item);
+    void prepareLayout();
+    static quint32 crc32(const char *data, uint len);
+
+    mutable QCacheItem lastItem;
+    QString cacheDirectory;
+    QString dataDirectory;
+    qint64 maximumCacheSize;
+    qint64 currentCacheSize;
+
+    QHash<QIODevice*, QCacheItem*> inserting;
+    Q_DECLARE_PUBLIC(QNetworkDiskCache)
+};
+
+QT_END_NAMESPACE
+
+#endif // QT_NO_NETWORKDISKCACHE
+
+#endif // QNETWORKDISKCACHE_P_H