Add simple config file support to XSwiftBus

This adds a simple configuration file to XSwiftbus. So far, only the
xswiftbus DBus server is configured.

ref T291

src/xswiftbus/config.h

@@ -0,0 +1,68 @@
+/* Copyright (C) 2018
+ * swift Project Community / Contributors
+ *
+ * This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
+ * directory of this distribution and at http://www.swift-project.org/license.html. No part of swift project,
+ * including this file, may be copied, modified, propagated, or distributed except according to the terms
+ * contained in the LICENSE file.
+ */
+
+#ifndef BLACKSIM_XSWIFTBUS_CONFIG_H
+#define BLACKSIM_XSWIFTBUS_CONFIG_H
+
+#include <string>
+
+namespace XSwiftBus
+{
+    /*!
+     * XSwiftBus configuration class
+     */
+    class CConfig
+    {
+    public:
+        //! DBus Server Mode
+        enum DBusMode
+        {
+            DBusSession,
+            DBusP2P
+        };
+
+        //! Constructor.
+        CConfig();
+
+        //! Destructor;
+        ~CConfig();
+
+        //! Set config file path
+        void setFilePath(const std::string &filePath) { m_filePath = filePath; }
+
+        //! Load and parse config file
+        void parse();
+
+        //! Print the current configuration to the X-Plane log
+        void print();
+
+        //! Get current DBus mode
+        DBusMode getDBusMode() const { return m_dbusMode; }
+
+        //! Get current DBus server address
+        std::string getDBusAddress() const { return m_dbusAddress; }
+
+        //! Get current DBus server port
+        int getDBusPort() const { return m_dbusPort; }
+
+    private:
+        bool parseDBusMode(const std::string &value);
+        bool parseDBusAddress(const std::string &value);
+        bool parseDBusPort(const std::string &value);
+
+        static std::string dbusModeToString(DBusMode mode);
+
+        std::string m_filePath;
+        DBusMode m_dbusMode = DBusP2P;
+        std::string m_dbusAddress = "127.0.0.1";
+        int m_dbusPort = 45001;
+    };
+} // ns
+
+#endif