/****************************************************************************
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
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**
** This file is part of the QtNetwork module of the Qt Toolkit.
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** 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
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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