ILLUSIONS: Implement save/load functionality

- Only works in Duckman at the moment
- Only via the ScummVM main menu for now, save/load via the game's menu to be implemented

1 files changed, 53 insertions, 0 deletions

diff --git a/engines/illusions/gamestate.h b/engines/illusions/gamestate.h
new file mode 100644
index 0000000000..5f279ff0c3
--- /dev/null
+++ b/engines/illusions/gamestate.h
@@ -0,0 +1,53 @@
+/* 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.
+ *
+ */
+
+#ifndef ILLUSIONS_GAMESTATE_H
+#define ILLUSIONS_GAMESTATE_H
+
+#include "common/file.h"
+#include "common/memstream.h"
+
+namespace Illusions {
+
+class GameState {
+public:
+	GameState();
+	virtual ~GameState();
+	bool readState(uint32 &sceneId, uint32 &threadId);
+	void writeState(uint32 sceneId, uint32 threadId);
+	void read(Common::ReadStream *in);
+	void write(Common::WriteStream *out);
+	void deleteReadStream();
+protected:
+	uint32 _writeBufferSize;
+	byte *_writeBuffer;
+	Common::SeekableReadStream *_readStream;
+	Common::WriteStream *newWriteStream();
+	uint32 calcWriteBufferSize();
+	virtual uint32 calcWriteBufferSizeInternal() = 0;
+	virtual bool readStateInternal(Common::ReadStream *in) = 0;
+	virtual void writeStateInternal(Common::WriteStream *out) = 0;
+};
+
+} // End of namespace Illusions
+
+#endif // ILLUSIONS_GAMESTATE_H