Assembly resolving, fixes to crate dropping.

OpenRA.FileFormats/FileSystem.cs

@@ -21,6 +21,7 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using System.Reflection;
 
 namespace OpenRA.FileFormats
 {
@@ -134,5 +135,34 @@ namespace OpenRA.FileFormats
 
 			return false;
 		}
+
+		static Dictionary<string, Assembly> assemblyCache = new Dictionary<string, Assembly>();
+
+		public static Assembly ResolveAssembly(object sender, ResolveEventArgs e)
+		{
+			foreach (var assembly in AppDomain.CurrentDomain.GetAssemblies())
+			{
+				if (assembly.FullName == e.Name)
+					return assembly;
+			}
+
+			string[] frags = e.Name.Split(',');
+			var filename = frags[0] + ".dll";
+			Assembly a;
+			if (assemblyCache.TryGetValue(filename, out a))
+				return a;
+
+			if (FileSystem.Exists(filename))
+				using (Stream s = FileSystem.Open(filename))
+				{
+					byte[] buf = new byte[s.Length];
+					s.Read(buf, 0, buf.Length);
+					a = Assembly.Load(buf);
+					assemblyCache.Add(filename, a);
+					return a;
+				}
+			
+			return null;
+		}
 	}
 }