Added UUID for game sessions

Allows the SavegameManager to destroy all saves related to the current UUID session so hardcore mods can enforce this safely instead of needing to go nuclear.

src/common/engine/i_interface.cpp

@@ -6,6 +6,7 @@
 #include "gstrings.h"
 #include "version.h"
 #include "m_argv.h"
+#include "m_random.h"
 
 static_assert(sizeof(void*) == 8,
 	"Only LP64/LLP64 builds are officially supported. "
@@ -182,3 +183,12 @@ int FStartupSelectionInfo::SaveInfo()
 	return DefaultIWAD;
 }
 
+FString GameUUID;
+static FRandom pr_uuid("GameUUID");
+
+FString GenerateUUID()
+{
+	FString uuid;
+	uuid.AppendFormat("%08X-%04X-4%03X-9%03X-%08X%04X", pr_uuid.GenRand32(), pr_uuid(UINT16_MAX), pr_uuid(4095), pr_uuid(4095), pr_uuid.GenRand32(), pr_uuid(UINT16_MAX));
+	return uuid;
+}

src/common/engine/i_interface.h

@@ -13,6 +13,9 @@ class FConfigFile;
 class FArgs;
 struct FTranslationID;
 
+extern FString GameUUID;
+FString GenerateUUID();
+
 struct SystemCallbacks
 {
 	bool (*G_Responder)(event_t* ev);	// this MUST be set, otherwise nothing will work

src/common/menu/savegamemanager.cpp

@@ -48,6 +48,7 @@
 #include "savegamemanager.h"
 #include "m_argv.h"
 #include "i_specialpaths.h"
+#include "i_interface.h"
 
 CVAR(String, save_dir, "", CVAR_ARCHIVE | CVAR_GLOBALCONFIG | CVAR_SYSTEM_ONLY);
 FString SavegameFolder;
@@ -191,6 +192,7 @@ void FSavegameManagerBase::NotifyNewSave(const FString &file, const FString &tit
 		{
 			node->SaveTitle = title;
 			node->CreationTime = myasctime();
+			node->UUID = GameUUID;
 			node->bOldVersion = false;
 			node->bMissingWads = false;
 
@@ -210,6 +212,7 @@ void FSavegameManagerBase::NotifyNewSave(const FString &file, const FString &tit
 	auto node = new FSaveGameNode;
 	node->SaveTitle = title;
 	node->CreationTime = myasctime();
+	node->UUID = GameUUID;
 	node->Filename = file;
 	node->bOldVersion = false;
 	node->bMissingWads = false;
@@ -560,6 +563,27 @@ bool FSavegameManagerBase::RemoveNewSaveNode()
 	return false;
 }
 
+int FSavegameManagerBase::RemoveUUIDSaveSlots()
+{
+	if (GameUUID.IsEmpty())
+		return -1;
+
+	// Make sure there's any saves in the list first.
+	if (!SaveGames.Size())
+		ReadSaveStrings();
+
+	int index = -1;
+	for (int i = SaveGames.Size() - 1; i >= 0; --i)
+	{
+		auto& save = SaveGames[i];
+		if (save == &NewSaveNode || save->UUID.Compare(GameUUID))
+			continue;
+
+		index = RemoveSaveSlot(i);
+	}
+	return index;
+}
+
 DEFINE_ACTION_FUNCTION(FSavegameManager, RemoveNewSaveNode)
 {
 	PARAM_SELF_STRUCT_PROLOGUE(FSavegameManagerBase);
@@ -581,9 +605,15 @@ DEFINE_ACTION_FUNCTION(FSavegameManager, ExtractSaveData)
 	ACTION_RETURN_INT(self->ExtractSaveData(sel));
 }
 
+DEFINE_ACTION_FUNCTION(FSavegameManager, RemoveUUIDSaveSlots)
+{
+	PARAM_SELF_STRUCT_PROLOGUE(FSavegameManagerBase);
+	ACTION_RETURN_INT(self->RemoveUUIDSaveSlots());
+}
 
 DEFINE_FIELD(FSaveGameNode, SaveTitle);
 DEFINE_FIELD(FSaveGameNode, Filename);
+DEFINE_FIELD(FSaveGameNode, UUID);
 DEFINE_FIELD(FSaveGameNode, bOldVersion);
 DEFINE_FIELD(FSaveGameNode, bMissingWads);
 DEFINE_FIELD(FSaveGameNode, bNoDelete);

src/common/menu/savegamemanager.h

@@ -12,6 +12,7 @@ struct FSaveGameNode
 	FString SaveTitle;
 	FString Filename;
 	FString CreationTime;
+	FString UUID;
 	bool bOldVersion = false;
 	bool bMissingWads = false;
 	bool bNoDelete = false;
@@ -57,6 +58,7 @@ public:
 	FSaveGameNode *GetSavegame(int i);
 	void InsertNewSaveNode();
 	bool RemoveNewSaveNode();
+	int RemoveUUIDSaveSlots();
 
 };
 

src/g_game.cpp

@@ -2009,6 +2009,7 @@ void G_DoLoadGame ()
 	arc("Save Version", SaveVersion);
 	arc("Engine", engine);
 	arc("Current Map", map);
+	arc("GameUUID", GameUUID);
 
 	if (engine.CompareNoCase(GAMESIG) != 0)
 	{
@@ -2386,6 +2387,7 @@ void G_DoSaveGame (bool okForQuicksave, bool forceQuicksave, FString filename, c
 	savegameinfo.AddString("Software", buf)
 		.AddString("Engine", GAMESIG)
 		("Save Version", ver)
+		("GameUUID", GameUUID)
 		.AddString("Title", description)
 		.AddString("Current Map", primaryLevel->MapName.GetChars());
 

src/g_level.cpp

@@ -636,6 +636,7 @@ void G_InitNew (const char *mapname, bool bTitleLevel)
 			players[i].playerstate = PST_ENTER;	// [BC]
 
 		STAT_StartNewGame(mapname);
+		GameUUID = GenerateUUID();
 	}
 
 	usergame = !bTitleLevel;		// will be set false if a demo

src/menu/loadsavemenu.cpp

@@ -102,6 +102,7 @@ void FSavegameManager::ReadSaveStrings()
 						FString iwad = arc.GetString("Game WAD");
 						FString title = arc.GetString("Title");
 						FString creationtime = arc.GetString("Creation Time");
+						FString uuid = arc.GetString("GameUUID");
 
 
 						if (engine.Compare(GAMESIG) != 0 || savever > SAVEVER)
@@ -128,6 +129,7 @@ void FSavegameManager::ReadSaveStrings()
 
 						FSaveGameNode *node = new FSaveGameNode;
 						node->Filename = entry.FilePath.c_str();
+						node->UUID = uuid;
 						node->bOldVersion = oldVer;
 						node->bMissingWads = missing;
 						node->SaveTitle = title;