Add support for oramod packages.

OpenRA.Game/FileSystem/ZipFolder.cs

@@ -0,0 +1,75 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2015 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 COPYING.
+ */
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using ICSharpCode.SharpZipLib.Zip;
+using SZipFile = ICSharpCode.SharpZipLib.Zip.ZipFile;
+
+namespace OpenRA.FileSystem
+{
+	public sealed class ZipFolder : IReadOnlyPackage
+	{
+		public string Name { get; private set; }
+		public ZipFile Parent { get; private set; }
+		readonly string path;
+
+		static ZipFolder()
+		{
+			ZipConstants.DefaultCodePage = Encoding.UTF8.CodePage;
+		}
+
+		public ZipFolder(FileSystem context, ZipFile parent, string path, string filename)
+		{
+			if (filename.EndsWith("/"))
+				filename = filename.Substring(0, filename.Length - 1);
+
+			Name = filename;
+			Parent = parent;
+			if (path.EndsWith("/"))
+				path = path.Substring(0, path.Length - 1);
+
+			this.path = path;
+		}
+
+		public Stream GetStream(string filename)
+		{
+			// Zip files use '/' as a path separator
+			return Parent.GetStream(path + '/' + filename);
+		}
+
+		public IEnumerable<string> Contents
+		{
+			get
+			{
+				foreach (var entry in Parent.Contents)
+				{
+					if (entry.StartsWith(path) && entry != path)
+					{
+						var filename = entry.Substring(path.Length + 1);
+						var dirLevels = filename.Split('/').Count(c => !string.IsNullOrEmpty(c));
+						if (dirLevels == 1)
+							yield return filename;
+					}
+				}
+			}
+		}
+
+		public bool Contains(string filename)
+		{
+			return Parent.Contains(path + '/' + filename);
+		}
+
+		public void Dispose() { /* nothing to do */ }
+	}
+}