PEGASUS: Implement saving/restoring the in-game AI data

AI data should now be restored properly after the space chase

engines/pegasus/ai/ai_area.cpp

@@ -23,6 +23,8 @@
  *
  */
 
+#include "common/memstream.h"
+
 #include "pegasus/cursor.h"
 #include "pegasus/pegasus.h"
 #include "pegasus/ai/ai_area.h"
@@ -72,11 +74,21 @@ AIArea::~AIArea() {
 
 // Save last state of AI rules...
 void AIArea::saveAIState() {
-	// TODO
+	PegasusEngine *vm = (PegasusEngine *)g_engine;
+
+	delete vm->_aiSaveStream;
+
+	Common::MemoryWriteStreamDynamic out;
+	writeAIRules(&out);
+
+	vm->_aiSaveStream = new Common::MemoryReadStream(out.getData(), out.size(), DisposeAfterUse::YES);
 }
 
 void AIArea::restoreAIState() {
-	// TODO
+	PegasusEngine *vm = (PegasusEngine *)g_engine;
+
+	if (vm->_aiSaveStream)
+		readAIRules(vm->_aiSaveStream);
 }
 
 void AIArea::writeAIRules(Common::WriteStream *stream) {

engines/pegasus/pegasus.cpp

@@ -90,6 +90,7 @@ PegasusEngine::PegasusEngine(OSystem *syst, const PegasusGameDescription *gamede
 	_idlerHead = 0;
 	_currentCD = 1;
 	_introTimer = 0;
+	_aiSaveStream = 0;
 }
 
 PegasusEngine::~PegasusEngine() {
@@ -101,6 +102,7 @@ PegasusEngine::~PegasusEngine() {
 	delete _neighborhood;
 	delete _rnd;
 	delete _introTimer;
+	delete _aiSaveStream;
 
 	// NOTE: This must be deleted last!
 	delete _gfx;

engines/pegasus/pegasus.h

@@ -162,6 +162,7 @@ friend class InputHandler;
 	bool canSolve();
 	void prepareForAIHint(const Common::String &);
 	void cleanUpAfterAIHint(const Common::String &);
+	Common::SeekableReadStream *_aiSaveStream;
 
 	// Neighborhood
 	void jumpToNewEnvironment(const NeighborhoodID, const RoomID, const DirectionConstant);