1 files changed, 79 insertions, 0 deletions
diff --git a/engines/glk/magnetic/magnetic.cpp b/engines/glk/magnetic/magnetic.cpp
new file mode 100644
index 0000000000..f3f3e79a86
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+++ b/engines/glk/magnetic/magnetic.cpp
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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * 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.
+ *
+ */
+
+#include "glk/magnetic/magnetic.h"
+#include "common/config-manager.h"
+#include "common/translation.h"
+
+namespace Glk {
+namespace Magnetic {
+
+Magnetic::Magnetic(OSystem *syst, const GlkGameDescription &gameDesc) : GlkAPI(syst, gameDesc),
+		vm_exited_cleanly(false) {
+}
+
+void Magnetic::runGame(Common::SeekableReadStream *gameFile) {
+	_gameFile = gameFile;
+
+	if (!is_gamefile_valid())
+		return;
+
+	// TODO
+}
+
+Common::Error Magnetic::loadGameData(strid_t file) {
+	// TODO
+	return Common::kNoError;
+}
+
+Common::Error Magnetic::saveGameData(strid_t file, const Common::String &desc) {
+	// TODO
+	return Common::kNoError;
+}
+
+bool Magnetic::is_gamefile_valid() {
+	if (_gameFile->size() < 8) {
+		GUIErrorMessage(_("This is too short to be a valid Glulx file."));
+		return false;
+	}
+
+	if (_gameFile->readUint32BE() != MKTAG('G', 'l', 'u', 'l')) {
+		GUIErrorMessage(_("This is not a valid Glulx file."));
+		return false;
+	}
+
+	// We support version 2.0 through 3.1.*
+	uint version = _gameFile->readUint32BE();
+	if (version < 0x20000) {
+		GUIErrorMessage(_("This Glulx file is too old a version to execute."));
+		return false;
+	}
+	if (version >= 0x30200) {
+		GUIErrorMessage(_("This Glulx file is too new a version to execute."));
+		return false;
+	}
+
+	return true;
+}
+
+} // End of namespace Magnetic
+} // End of namespace Glk