global settings in lobbyinfo; map change uses it.

OpenRa.FileFormats/FieldLoader.cs

@@ -22,12 +22,13 @@ namespace OpenRa.FileFormats
 				var field = self.GetType().GetField(x.Key.Trim());
 				if (field == null)
 					throw new NotImplementedException("Missing field `{0}` on `{1}`".F(x.Key.Trim(), self.GetType().Name));
-				field.SetValue(self, GetValue(field.FieldType, x.Value.Value.Trim()));
+				field.SetValue(self, GetValue(field.FieldType, x.Value.Value));
 			}
 		}
 
 		static object GetValue( Type fieldType, string x )
 		{
+			if (x != null) x = x.Trim();
 			if( fieldType == typeof( int ) )
 				return int.Parse( x );
 
@@ -45,6 +46,9 @@ namespace OpenRa.FileFormats
 
 			else if (fieldType.IsArray)
 			{
+				if (x == null)
+					return Array.CreateInstance(fieldType.GetElementType(), 0);
+
 				var parts = x.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
 
 				var ret = Array.CreateInstance(fieldType.GetElementType(), parts.Length);

OpenRa.FileFormats/Session.cs

@@ -8,13 +8,12 @@ namespace OpenRa.FileFormats
 	public class Session
 	{
 		public List<Client> Clients = new List<Client>();
-		// todo: add mods, mapname, global settings here
+		public Global GlobalSettings = new Global();
 
 		public enum ClientState
 		{
 			NotReady,
-			// Downloading,
-			// Uploading,
+			Downloading,
 			Ready
 		}
 
@@ -27,5 +26,12 @@ namespace OpenRa.FileFormats
 			public string Name;
 			public ClientState State;
 		}
+
+		public class Global
+		{
+			public string Map = "scm12ea.ini";
+			public string[] Mods = {};	// filename:sha1 pairs.
+			public int OrderLatency;
+		}
 	}
 }