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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