Add a simple FTP client example

With the provided FTP client you can fetch text files via anonymous FTP.

Change-Id: I622264d72aac71492bf474dc1936917fdc78d499
Reviewed-by: Erik Verbruggen <erik.verbruggen@qt.io>

1 files changed, 93 insertions, 0 deletions

diff --git a/examples/scxml/ftpclient/ftpcontrolchannel.cpp b/examples/scxml/ftpclient/ftpcontrolchannel.cpp
new file mode 100644
index 0000000..e90242d
--- /dev/null
+++ b/examples/scxml/ftpclient/ftpcontrolchannel.cpp
@@ -0,0 +1,93 @@
+/****************************************************************************
+**
+** 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
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+**     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."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "ftpcontrolchannel.h"
+
+FtpControlChannel::FtpControlChannel(QObject *parent) : QObject(parent)
+{
+    connect(&m_socket, &QIODevice::readyRead, this, &FtpControlChannel::onReadyRead);
+    connect(&m_socket, &QAbstractSocket::disconnected, this, &FtpControlChannel::closed);
+    connect(&m_socket, &QAbstractSocket::connected, this, [this]() {
+        emit opened(m_socket.localAddress(), m_socket.localPort());
+    });
+}
+
+void FtpControlChannel::connectToServer(const QString &server)
+{
+    m_socket.connectToHost(server, 21);
+}
+
+void FtpControlChannel::command(const QString &command, const QString &params)
+{
+    QByteArray sendData = command.toUtf8();
+    if (!params.isEmpty())
+        sendData += " " + params.toUtf8();
+    m_socket.write(sendData + "\r\n");
+}
+
+void FtpControlChannel::onReadyRead()
+{
+    m_buffer.append(m_socket.readAll());
+    int rn = -1;
+    while ((rn = m_buffer.indexOf("\r\n")) != -1) {
+        QByteArray received = m_buffer.mid(0, rn);
+        m_buffer = m_buffer.mid(rn + 2);
+        int space = received.indexOf(' ');
+        if (space != -1) {
+            int code = received.mid(0, space).toInt();
+            if (code == 0)
+                emit info(QString::fromUtf8(received.mid(space + 1)));
+            else
+                emit reply(code, QString::fromUtf8(received.mid(space + 1)));
+        } else {
+            emit invalidReply(QString::fromUtf8(received));
+        }
+    }
+}