beginnings of removing rampant ../../../ from sources

git-svn-id: svn://svn.ijw.co.nz/svn/OpenRa@1318 993157c7-ee19-0410-b2c4-bb4e9862e678

OpenRa.Game/FileSystem.cs

@@ -0,0 +1,40 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.IO;
+using OpenRa.FileFormats;
+
+namespace OpenRa.Game
+{
+	class Folder : IFolder
+	{
+		readonly string path;
+
+		public Folder(string path) { this.path = path; }
+
+		public Stream GetContent(string filename)
+		{
+			try { return File.OpenRead(path + filename); }
+			catch { throw new FileNotFoundException("File not found", filename); }
+		}
+	}
+
+	static class FileSystem
+	{
+		static List<IFolder> mountedFolders = new List<IFolder>();
+
+		public static void Mount(IFolder folder)
+		{
+			mountedFolders.Add(folder);
+		}
+
+		public static Stream Open(string filename)
+		{
+			foreach (IFolder folder in mountedFolders)
+				try { return folder.GetContent(filename); }
+				catch { }
+
+			throw new FileNotFoundException("File not found", filename);
+		}
+	}
+}