Add preliminary support of libtorrent v1.2

libtorrent v1.2 should be built with deprecated features enabled.

src/base/bittorrent/private/portforwarderimpl.h

@@ -0,0 +1,65 @@
+/*
+ * Bittorrent Client using Qt and libtorrent.
+ * Copyright (C) 2019  Vladimir Golovnev <glassez@yandex.ru>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ * In addition, as a special exception, the copyright holders give permission to
+ * link this program with the OpenSSL project's "OpenSSL" library (or with
+ * modified versions of it that use the same license as the "OpenSSL" library),
+ * and distribute the linked executables. You must obey the GNU General Public
+ * License in all respects for all of the code used other than "OpenSSL".  If you
+ * modify file(s), you may extend this exception to your version of the file(s),
+ * but you are not obligated to do so. If you do not wish to do so, delete this
+ * exception statement from your version.
+ */
+
+#pragma once
+
+#include <vector>
+#include <QHash>
+
+#include "base/net/portforwarder.h"
+#include "libtorrentfwd.h"
+
+#if (LIBTORRENT_VERSION_NUM < 10200)
+using LTPortMapping = int;
+#else
+#include <libtorrent/portmap.hpp>
+using LTPortMapping = lt::port_mapping_t;
+#endif
+
+class PortForwarderImpl : public Net::PortForwarder
+{
+    Q_DISABLE_COPY(PortForwarderImpl)
+
+public:
+    explicit PortForwarderImpl(lt::session *provider, QObject *parent = nullptr);
+    ~PortForwarderImpl() override;
+
+    bool isEnabled() const override;
+    void setEnabled(bool enabled) override;
+
+    void addPort(quint16 port) override;
+    void deletePort(quint16 port) override;
+
+private:
+    void start();
+    void stop();
+
+    bool m_active;
+    libtorrent::session *m_provider;
+    QHash<quint16, std::vector<LTPortMapping>> m_mappedPorts;
+};