add support for compressed packages (zip); strip unnecessary SharpZipLib dll. req reference to WindowsBase for System.IO.Packaging support (apparently Mono has it)

OpenRA.FileFormats/CompressedPackage.cs

@@ -0,0 +1,40 @@
+#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;
+using System.Collections.Generic;
+using System.IO;
+using System.IO.Packaging;
+using System.Linq;
+
+namespace OpenRA.FileFormats
+{
+	public class CompressedPackage : IFolder
+	{
+		readonly uint[] hashes;
+		readonly Stream s;
+		readonly ZipPackage pkg;
+
+		public CompressedPackage(string filename)
+		{
+			s = FileSystem.Open(filename);
+			pkg = (ZipPackage)ZipPackage.Open(s, FileMode.Open);
+			hashes = pkg.GetParts()
+				.Select(p => PackageEntry.HashFilename(p.Uri.LocalPath)).ToArray();
+		}
+
+		public Stream GetContent(string filename)
+		{
+			return pkg.GetPart(new Uri(filename)).GetStream(FileMode.Open);
+		}
+
+		public IEnumerable<uint> AllFileHashes() { return hashes; }
+	}
+}