Refactor Package -> MixFile; group filesystem related classes in FileFormats.

OpenRA.FileFormats/Filesystem/Folder.cs

@@ -0,0 +1,47 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2010 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made 
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation. For more information,
+ * see LICENSE.
+ */
+#endregion
+
+using System.Collections.Generic;
+using System.IO;
+
+namespace OpenRA.FileFormats
+{
+	public class Folder : IFolder
+	{
+		readonly string path;
+
+		int priority;
+
+		public Folder(string path, int priority) { this.path = path; this.priority = priority; }
+
+		public Stream GetContent(string filename)
+		{
+			try { return File.OpenRead( Path.Combine( path, filename ) ); }
+			catch { return null; }
+		}
+
+		public IEnumerable<uint> AllFileHashes()
+		{
+			foreach( var filename in Directory.GetFiles( path, "*", SearchOption.TopDirectoryOnly ) )
+				yield return PackageEntry.HashFilename( Path.GetFileName(filename) );
+		}
+		
+		public bool Exists(string filename)
+		{
+			return File.Exists(Path.Combine(path,filename));
+		}
+
+
+		public int Priority
+		{
+			get { return priority; }
+		}
+	}
+}