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src/Network/native.cxx

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+// native.cxx -- FGFS "Native" protocal class
+//
+// Written by Curtis Olson, started November 1999.
+//
+// Copyright (C) 1999  Curtis L. Olson - http://www.flightgear.org/~curt
+//
+// 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.
+//
+// $Id$
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#include <simgear/debug/logstream.hxx>
+
+
+#include "native.hxx"
+
+#include <Main/globals.hxx>
+#include <FDM/fdm_shell.hxx>
+#include <FDM/flight.hxx>
+
+FGNative::FGNative() {
+}
+
+FGNative::~FGNative() {
+}
+
+
+// open hailing frequencies
+bool FGNative::open() {
+    if ( is_enabled() ) {
+	SG_LOG( SG_IO, SG_ALERT, "This shouldn't happen, but the channel " 
+		<< "is already in use, ignoring" );
+	return false;
+    }
+
+    SGIOChannel *io = get_io_channel();
+
+    if ( ! io->open( get_direction() ) ) {
+	SG_LOG( SG_IO, SG_ALERT, "Error opening channel communication layer." );
+	return false;
+    }
+
+    set_enabled( true );
+
+    return true;
+}
+
+// process work for this port
+bool FGNative::process()
+{
+    FDMShell* fdm = static_cast<FDMShell*>(globals->get_subsystem("flight"));
+    FGInterface* fdmState = fdm->getInterface();
+    if (!fdmState) {
+        return false;
+    }
+    
+    SGIOChannel *io = get_io_channel();
+    if ( get_direction() == SG_IO_OUT ) {
+        return fdmState->writeState(io);
+    } else {
+        return fdmState->readState(io);
+    }
+}
+
+
+// close the channel
+bool FGNative::close() {
+    SGIOChannel *io = get_io_channel();
+
+    set_enabled( false );
+
+    if ( ! io->close() ) {
+	return false;
+    }
+
+    return true;
+}