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

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     #ifndef PEERWIRECLIENT_H
     #define PEERWIRECLIENT_H

     #include <QBitArray>
     #include <QList>
     #include <QTcpSocket>

     class E_CLASS(QHostAddress;
     class E_CLASS(QTimerEvent;
     class TorrentPeer;

     struct TorrentBlock
     {
         inline TorrentBlock(int p, int o, int l)
             : pieceIndex(p), offset(o), length(l)
         {
         }
         inline bool operator==(const TorrentBlock &other) const
         {
             return pieceIndex == other.pieceIndex
                     && offset == other.offset
                     && length == other.length;
         }

         int pieceIndex;
         int offset;
         int length;
     };

     class PeerWireClient : public QTcpSocket
     {
         Q_OBJECT

     public:
         enum PeerWireStateFlag {
             ChokingPeer = 0x1,
             InterestedInPeer = 0x2,
             ChokedByPeer = 0x4,
             PeerIsInterested = 0x8
         };
         Q_DECLARE_FLAGS(PeerWireState, PeerWireStateFlag)

         PeerWireClient(const QByteArray &peerId, QObject *parent = 0);
         void initialize(const QByteArray &infoHash, int pieceCount);

         void setPeer(TorrentPeer *peer);
         TorrentPeer *peer() const;

         // State
         inline PeerWireState peerWireState() const { return pwState; }
         QBitArray availablePieces() const;
         QList<TorrentBlock> incomingBlocks() const;

         // Protocol
         void chokePeer();
         void unchokePeer();
         void sendInterested();
         void sendKeepAlive();
         void sendNotInterested();
         void sendPieceNotification(int piece);
         void sendPieceList(const QBitArray &bitField);
         void requestBlock(int piece, int offset, int length);
         void cancelRequest(int piece, int offset, int length);
         void sendBlock(int piece, int offset, const QByteArray &data);

         // Rate control
         qint64 writeToSocket(qint64 bytes);
         qint64 readFromSocket(qint64 bytes);
         qint64 downloadSpeed() const;
         qint64 uploadSpeed() const;

         bool canTransferMore() const;
         qint64 bytesAvailable() const { return incomingBuffer.size() + QTcpSocket::bytesAvailable(); }
         qint64 socketBytesAvailable() const { return socket.bytesAvailable(); }
         qint64 socketBytesToWrite() const { return socket.bytesToWrite(); }

         void setReadBufferSize(int size);

     signals:
         void infoHashReceived(const QByteArray &infoHash);
         void readyToTransfer();

         void choked();
         void unchoked();
         void interested();
         void notInterested();

         void piecesAvailable(const QBitArray &pieces);
         void blockRequested(int pieceIndex, int begin, int length);
         void blockReceived(int pieceIndex, int begin, const QByteArray &data);

         void bytesReceived(qint64 size);

     protected slots:
         void connectToHostImplementation(const QString &hostName,
                                          quint16 port, OpenMode openMode = ReadWrite);
         void diconnectFromHostImplementation();

     protected:
         void timerEvent(QTimerEvent *event);

         qint64 readData(char *data, qint64 maxlen);
         qint64 readLineData(char *data, qint64 maxlen);
         qint64 writeData(const char *data, qint64 len);

     private slots:
         void sendHandShake();
         void processIncomingData();
         void socketStateChanged(QAbstractSocket::SocketState state);

     private:
         // Data waiting to be read/written
         QByteArray incomingBuffer;
         QByteArray outgoingBuffer;

         struct BlockInfo {
             int pieceIndex;
             int offset;
             int length;
             QByteArray block;
         };
         QList<BlockInfo> pendingBlocks;
         int pendingBlockSizes;
         QList<TorrentBlock> incoming;

         enum PacketType {
             ChokePacket = 0,
             UnchokePacket = 1,
             InterestedPacket = 2,
             NotInterestedPacket = 3,
             HavePacket = 4,
             BitFieldPacket = 5,
             RequestPacket = 6,
             PiecePacket = 7,
             CancelPacket = 8
         };

         // State
         PeerWireState pwState;
         bool receivedHandShake;
         bool gotPeerId;
         bool sentHandShake;
         int nextPacketLength;

         // Upload/download speed records
         qint64 uploadSpeedData[8];
         qint64 downloadSpeedData[8];
         int transferSpeedTimer;

         // Timeout handling
         int timeoutTimer;
         int pendingRequestTimer;
         bool invalidateTimeout;
         int keepAliveTimer;

         // Checksum, peer ID and set of available pieces
         QByteArray infoHash;
         QByteArray peerIdString;
         QBitArray peerPieces;
         TorrentPeer *torrentPeer;

         QTcpSocket socket;
     };

     Q_DECLARE_OPERATORS_FOR_FLAGS(PeerWireClient::PeerWireState)

     #endif