Zstd: Enable zstd for autosaves

See also: https://github.com/OpenTTD/OpenTTD/pull/8773

src/genworld.cpp

@@ -215,7 +215,7 @@ static void _GenerateWorld()
 		if (_debug_desync_level > 0) {
 			char name[MAX_PATH];
 			seprintf(name, lastof(name), "dmp_cmds_%08x_%08x.sav", _settings_game.game_creation.generation_seed, _date);
-			SaveOrLoad(name, SLO_SAVE, DFT_GAME_FILE, AUTOSAVE_DIR, false);
+			SaveOrLoad(name, SLO_SAVE, DFT_GAME_FILE, AUTOSAVE_DIR, false, SMF_ZSTD_OK);
 		}
 	} catch (...) {
 		BasePersistentStorageArray::SwitchMode(PSM_LEAVE_GAMELOOP, true);

src/network/network_client.cpp

@@ -139,7 +139,7 @@ void ClientNetworkEmergencySave()
 
 	const char *filename = "netsave.sav";
 	DEBUG(net, 0, "Client: Performing emergency save (%s)", filename);
-	SaveOrLoad(filename, SLO_SAVE, DFT_GAME_FILE, AUTOSAVE_DIR, false);
+	SaveOrLoad(filename, SLO_SAVE, DFT_GAME_FILE, AUTOSAVE_DIR, false, SMF_ZSTD_OK);
 }
 
 

src/openttd.cpp

@@ -1902,7 +1902,7 @@ static void DoAutosave()
 	}
 
 	DEBUG(sl, 2, "Autosaving to '%s'", buf);
-	if (SaveOrLoad(buf, SLO_SAVE, DFT_GAME_FILE, AUTOSAVE_DIR) != SL_OK) {
+	if (SaveOrLoad(buf, SLO_SAVE, DFT_GAME_FILE, AUTOSAVE_DIR, true, SMF_ZSTD_OK) != SL_OK) {
 		ShowErrorMessage(STR_ERROR_AUTOSAVE_FAILED, INVALID_STRING_ID, WL_ERROR);
 	}
 }

src/saveload/saveload.cpp

@@ -3492,7 +3492,7 @@ SaveOrLoadResult LoadWithFilter(LoadFilter *reader)
  * @param threaded True when threaded saving is allowed
  * @return Return the result of the action. #SL_OK, #SL_ERROR, or #SL_REINIT ("unload" the game)
  */
-SaveOrLoadResult SaveOrLoad(const std::string &filename, SaveLoadOperation fop, DetailedFileType dft, Subdirectory sb, bool threaded)
+SaveOrLoadResult SaveOrLoad(const std::string &filename, SaveLoadOperation fop, DetailedFileType dft, Subdirectory sb, bool threaded, SaveModeFlags save_flags)
 {
 	/* An instance of saving is already active, so don't go saving again */
 	if (_sl.saveinprogress && fop == SLO_SAVE && dft == DFT_GAME_FILE && threaded) {
@@ -3545,7 +3545,7 @@ SaveOrLoadResult SaveOrLoad(const std::string &filename, SaveLoadOperation fop,
 
 			default: NOT_REACHED();
 		}
-		_sl.save_flags = SMF_NONE;
+		_sl.save_flags = save_flags;
 
 		FILE *fh = (fop == SLO_SAVE) ? FioFOpenFile(filename, "wb", sb) : FioFOpenFile(filename, "rb", sb);
 
@@ -3584,7 +3584,7 @@ SaveOrLoadResult SaveOrLoad(const std::string &filename, SaveLoadOperation fop,
 /** Do a save when exiting the game (_settings_client.gui.autosave_on_exit) */
 void DoExitSave()
 {
-	SaveOrLoad("exit.sav", SLO_SAVE, DFT_GAME_FILE, AUTOSAVE_DIR);
+	SaveOrLoad("exit.sav", SLO_SAVE, DFT_GAME_FILE, AUTOSAVE_DIR, true, SMF_ZSTD_OK);
 }
 
 /**

src/saveload/saveload.h

@@ -399,7 +399,7 @@ extern FileToSaveLoad _file_to_saveload;
 void GenerateDefaultSaveName(char *buf, const char *last);
 void SetSaveLoadError(StringID str);
 const char *GetSaveLoadErrorString();
-SaveOrLoadResult SaveOrLoad(const std::string &filename, SaveLoadOperation fop, DetailedFileType dft, Subdirectory sb, bool threaded = true);
+SaveOrLoadResult SaveOrLoad(const std::string &filename, SaveLoadOperation fop, DetailedFileType dft, Subdirectory sb, bool threaded = true, SaveModeFlags flags = SMF_NONE);
 void WaitTillSaved();
 void ProcessAsyncSaveFinish();
 void DoExitSave();