--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/examples/network/torrent/peerwireclient.h	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,210 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef PEERWIRECLIENT_H
+#define PEERWIRECLIENT_H
+
+#include <QBitArray>
+#include <QList>
+#include <QTcpSocket>
+
+QT_BEGIN_NAMESPACE
+class QHostAddress;
+class QTimerEvent;
+QT_END_NAMESPACE
+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