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filemanager.h Example File
network/torrent/filemanager.h

/****************************************************************************
**
** Copyright (C) 2004-2006 Trolltech ASA. All rights reserved.
**
** This file is part of the example classes of the Qt Toolkit.
**
** Licensees holding valid Qt Preview licenses may use this file in
** accordance with the Qt Preview License Agreement provided with the
** Software.
**
** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
** information about Qt Commercial License Agreements.
**
** Contact info@trolltech.com if any conditions of this licensing are
** not clear to you.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/

#ifndef FILEMANAGER_H
#define FILEMANAGER_H

class QByteArray;
class QFile;
class QTimerEvent;

#include <QBitArray>
#include <QList>
#include <QMutex>
#include <QThread>
#include <QWaitCondition>

#include "metainfo.h"

class FileManager : public QThread
{
    Q_OBJECT

public:
    FileManager(QObject *parent = 0);
    virtual ~FileManager();

    inline void setMetaInfo(const MetaInfo &info) { metaInfo = info; }
    inline void setDestinationFolder(const QString &directory) { destinationPath = directory; }

    int read(int pieceIndex, int offset, int length);
    void write(int pieceIndex, int offset, const QByteArray &data);
    void verifyPiece(int pieceIndex);
    inline qint64 totalSize() const { return totalLength; }

    inline int pieceCount() const { return numPieces; }
    int pieceLengthAt(int pieceIndex) const;

    QBitArray completedPieces() const;
    void setCompletedPieces(const QBitArray &pieces);

    QString errorString() const;

public slots:
    void startDataVerification();

signals:
    void dataRead(int id, int pieceIndex, int offset, const QByteArray &data);
    void error();
    void verificationProgress(int percent);
    void verificationDone();
    void pieceVerified(int pieceIndex, bool verified);

protected:
    void run();

private slots:
    bool verifySinglePiece(int pieceIndex);
    void wakeUp();

private:
    bool generateFiles();
    QByteArray readBlock(int pieceIndex, int offset, int length);
    bool writeBlock(int pieceIndex, int offset, const QByteArray &data);
    void verifyFileContents();

    struct WriteRequest {
        int pieceIndex;
        int offset;
        QByteArray data;
    };
    struct ReadRequest {
        int pieceIndex;
        int offset;
        int length;
        int id;
    };

    QString errString;
    QString destinationPath;
    MetaInfo metaInfo;
    QList<QFile *> files;
    QList<QByteArray> sha1s;
    QBitArray verifiedPieces;

    bool newFile;
    int pieceLength;
    qint64 totalLength;
    int numPieces;
    int readId;
    bool startVerification;
    bool quit;
    bool wokeUp;

    QList<WriteRequest> writeRequests;
    QList<ReadRequest> readRequests;
    QList<int> pendingVerificationRequests;
    QList<int> newPendingVerificationRequests;
    QList<qint64> fileSizes;

    mutable QMutex mutex;
    mutable QWaitCondition cond;
};

#endif


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Qt 4.2.0-rc1