Store and compare MD5s in the saves

svn-id: r41245

3 files changed, 30 insertions, 1 deletions

diff --git a/engines/agi/agi.h b/engines/agi/agi.h
index 5a577c9fba..fb58c86db2 100644
--- a/engines/agi/agi.h
+++ b/engines/agi/agi.h
@@ -754,6 +754,8 @@ public:
 	uint16 getGameType() const;
 	Common::Language getLanguage() const;
 	Common::Platform getPlatform() const;
+	const char *getGameMD5() const;
+
 	Common::Error loadGameState(int slot);
 	Common::Error saveGameState(int slot, const char *desc);
 	bool canLoadGameStateCurrently();
diff --git a/engines/agi/detection.cpp b/engines/agi/detection.cpp
index fd81fc0ca0..daea94cb9b 100644
--- a/engines/agi/detection.cpp
+++ b/engines/agi/detection.cpp
@@ -70,6 +70,10 @@ uint16 AgiBase::getGameType() const {
 	return _gameDescription->gameType;
 }
 
+const char *AgiBase::getGameMD5() const {
+	return _gameDescription->desc.filesDescriptions[0].md5;
+}
+
 }
 
 static const PlainGameDescriptor agiGames[] = {
diff --git a/engines/agi/saveload.cpp b/engines/agi/saveload.cpp
index e4cf4afd2c..46f6d8d734 100644
--- a/engines/agi/saveload.cpp
+++ b/engines/agi/saveload.cpp
@@ -39,7 +39,7 @@
 #include "agi/keyboard.h"
 #include "agi/menu.h"
 
-#define SAVEGAME_VERSION 4
+#define SAVEGAME_VERSION 5
 
 //
 // Version 0 (Sarien): view table has 64 entries
@@ -47,6 +47,7 @@
 // Version 2 (ScummVM): first ScummVM version
 // Version 3 (ScummVM): added AGIPAL save/load support
 // Version 4 (ScummVM): added thumbnails and save creation date/time
+// Version 5 (ScummVM): Added game md5
 //
 
 namespace Agi {
@@ -96,6 +97,10 @@ int AgiEngine::saveGame(const char *fileName, const char *description) {
 	out->write(gameIDstring, 8);
 	debugC(5, kDebugLevelMain | kDebugLevelSavegame, "Writing game id (%s, %s)", gameIDstring, _game.id);
 
+	const char *tmp = getGameMD5();
+	for (i = 0; i < 32; i++)
+		out->writeByte(tmp[i]);
+
 	for (i = 0; i < MAX_FLAGS; i++)
 		out->writeByte(_game.flags[i]);
 	for (i = 0; i < MAX_VARS; i++)
@@ -299,6 +304,24 @@ int AgiEngine::loadGame(const char *fileName, bool checkId) {
 
 	strncpy(_game.id, loadId, 8);
 
+	if (saveVersion >= 5) {
+		char md5[32 + 1];
+
+		for (i = 0; i < 32; i++) {
+			md5[i] = in->readByte();
+
+		}
+		md5[i] = 0; // terminate
+
+		debug(0, "Saved game MD5: %s", md5);
+
+		if (strcmp(md5, getGameMD5())) {
+			warning("Game was saved with different gamedata - you may encounter problems");
+
+			debug(0, "You have %s and save is %s.", getGameMD5(), md5);
+		}
+	}
+	
 	for (i = 0; i < MAX_FLAGS; i++)
 		_game.flags[i] = in->readByte();
 	for (i = 0; i < MAX_VARS; i++)