qt-everywhere-src-5.14.1/qtscxml/examples/scxml/ftpclient/ftpdatachannel.h

/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtScxml module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, 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 The Qt Company Ltd 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 FTPDATACHANNEL_H
#define FTPDATACHANNEL_H

#include <QObject>
#include <QScopedPointer>
#include <QTcpServer>
#include <QTcpSocket>

class FtpDataChannel : public QObject
{
    Q_OBJECT
public:
    explicit FtpDataChannel(QObject *parent = nullptr);

    // Listen on a local address.
    void listen(const QHostAddress &address = QHostAddress::Any);

    // Send data over the socket.
    void sendData(const QByteArray &data);

    // Close the connection.
    void close();

    // Retrieve the port specification to be announced on the control channel.
    // Something like "a,b,c,d,xxx,yyy" where
    // - a.b.c.d would be the IP address in decimal/dot notation and
    // - xxx,yyy are the upper and lower 8 bits of the TCP port in decimal
    // (This will only work if the local address we're listening on
    // is actually meaningful)
    QString portspec() const;

signals:

    // The FTP server has sent some data.
    void dataReceived(const QByteArray &data);

private:
    QTcpServer m_server;
    QScopedPointer<QTcpSocket> m_socket;
};

#endif // FTPDATACHANNEL_H