/****************************************************************************

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** Copyright (C) 2010 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.

**

** $QT_BEGIN_LICENSE:LGPL$

** Commercial Usage

** Licensees holding valid Qt Commercial licenses may use this file in

** accordance with the Qt Commercial License Agreement provided with the

** Software or, alternatively, in accordance with the terms contained in

** a written agreement between you and Nokia.

**

** 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

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****************************************************************************/

#ifndef NETWORKDISKCACHE_P_H

#define NETWORKDISKCACHE_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>

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 NetworkDiskCachePrivate : public QAbstractNetworkCachePrivate

{

public:

    NetworkDiskCachePrivate()

        : QAbstractNetworkCachePrivate()

        , maximumCacheSize(1024 * 1024 * 50)

        , currentCacheSize(-1)

        {}

    QByteArray generateId(const QUrl &url) const;

    QString cacheFileName(const QUrl &url) const;

    QString tmpCacheFileName() const;

    bool removeFile(const QString &file);

    void storeItem(QCacheItem *item);

    static quint32 crc32(const char *data, uint len);

    mutable QCacheItem lastItem;

    QString cacheDirectory;

    qint64 maximumCacheSize;

    qint64 currentCacheSize;

    QHash<QIODevice*, QCacheItem*> inserting;

    Q_DECLARE_PUBLIC(NetworkDiskCache)

};

QT_END_NAMESPACE

#endif // NETWORKDISKCACHE_P_H