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

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     #ifndef TORRENTCLIENT_H
     #define TORRENTCLIENT_H

     #include <QBitArray>
     #include <QHostAddress>
     #include <QList>

     class MetaInfo;
     class PeerWireClient;
     class TorrentClientPrivate;
     class TorrentPeer;
     class TorrentPiece;
     class QTimerEvent;

     class TorrentPeer {
     public:
         QHostAddress address;
         quint16 port;
         QString id;
         bool interesting;
         bool seed;
         uint lastVisited;
         uint connectStart;
         uint connectTime;
         QBitArray pieces;
         int numCompletedPieces;

         inline bool operator==(const TorrentPeer &other)
         {
             return port == other.port
                 && address == other.address
                 && id == other.id;
         }
     };

     class TorrentClient : public QObject
     {
         Q_OBJECT

     public:
         enum State {
             Idle,
             Paused,
             Stopping,
             Preparing,
             Searching,
             Connecting,
             WarmingUp,
             Downloading,
             Endgame,
             Seeding
         };
         enum Error {
             UnknownError,
             TorrentParseError,
             InvalidTrackerError,
             FileError,
             ServerError
         };

         TorrentClient(QObject *parent = 0);
         ~TorrentClient();

         bool setTorrent(const QString &fileName);
         bool setTorrent(const QByteArray &torrentData);
         MetaInfo metaInfo() const;

         void setMaxConnections(int connections);
         int maxConnections() const;

         void setDestinationFolder(const QString &directory);
         QString destinationFolder() const;

         void setDumpedState(const QByteArray &dumpedState);
         QByteArray dumpedState() const;

         // Progress and stats for download feedback.
         qint64 progress() const;
         void setDownloadedBytes(qint64 bytes);
         qint64 downloadedBytes() const;
         void setUploadedBytes(qint64 bytes);
         qint64 uploadedBytes() const;
         int connectedPeerCount() const;
         int seedCount() const;

         // Accessors for the tracker
         QByteArray peerId() const;
         QByteArray infoHash() const;
         quint16 serverPort() const;

         // State and error.
         State state() const;
         QString stateString() const;
         Error error() const;
         QString errorString() const;

     signals:
         void stateChanged(TorrentClient::State state);
         void error(TorrentClient::Error error);

         void downloadCompleted();
         void peerInfoUpdated();

         void dataSent(int uploadedBytes);
         void dataReceived(int downloadedBytes);
         void progressUpdated(int percentProgress);
         void downloadRateUpdated(int bytesPerSecond);
         void uploadRateUpdated(int bytesPerSecond);

         void stopped();

     public slots:
         void start();
         void stop();
         void setPaused(bool paused);
         void setupIncomingConnection(PeerWireClient *client);

     protected slots:
         void timerEvent(QTimerEvent *event);

     private slots:
         // File management
         void sendToPeer(int readId, int pieceIndex, int begin, const QByteArray &data);
         void fullVerificationDone();
         void pieceVerified(int pieceIndex, bool ok);
         void handleFileError();

         // Connection handling
         void connectToPeers();
         QList<TorrentPeer *> weighedFreePeers() const;
         void setupOutgoingConnection();
         void initializeConnection(PeerWireClient *client);
         void removeClient();
         void peerPiecesAvailable(const QBitArray &pieces);
         void peerRequestsBlock(int pieceIndex, int begin, int length);
         void blockReceived(int pieceIndex, int begin, const QByteArray &data);
         void peerWireBytesWritten(qint64 bytes);
         void peerWireBytesReceived(qint64 bytes);
         int blocksLeftForPiece(const TorrentPiece *piece) const;

         // Scheduling
         void scheduleUploads();
         void scheduleDownloads();
         void schedulePieceForClient(PeerWireClient *client);
         void requestMore(PeerWireClient *client);
         int requestBlocks(PeerWireClient *client, TorrentPiece *piece, int maxBlocks);
         void peerChoked();
         void peerUnchoked();

         // Tracker handling
         void addToPeerList(const QList<TorrentPeer> &peerList);
         void trackerStopped();

         // Progress
         void updateProgress(int progress = -1);

     private:
         TorrentClientPrivate *d;
         friend class TorrentClientPrivate;
     };

     #endif