Qt 4.8: filemanager.h Example File (network/torrent/filemanager.h)

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# filemanager.h Example File

network/torrent/filemanager.h

     /****************************************************************************
     **
     ** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
     ** Contact: http://www.qt-project.org/legal
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
     ** You may use this file under the terms of the BSD license as follows:
     **
     ** "Redistribution and use in source and binary forms, with or without
     ** modification, are permitted provided that the following conditions are
     ** met:
     **   * Redistributions of source code must retain the above copyright
     **     notice, this list of conditions and the following disclaimer.
     **   * Redistributions in binary form must reproduce the above copyright
     **     notice, this list of conditions and the following disclaimer in
     **     the documentation and/or other materials provided with the
     **     distribution.
     **   * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
     **     of its contributors may be used to endorse or promote products derived
     **     from this software without specific prior written permission.
     **
     **
     ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
     **
     ** $QT_END_LICENSE$
     **
     ****************************************************************************/

     #ifndef FILEMANAGER_H
     #define FILEMANAGER_H

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

     #include "metainfo.h"

     class QByteArray;
     class QFile;
     class QTimerEvent;

     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