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

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     #ifndef FILEMANAGER_H
     #define FILEMANAGER_H

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

     #include "metainfo.h"

     class E_CLASS(QByteArray;
     class E_CLASS(QFile;
     class E_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