Initial commit: OpenRA game engine

Fork from OpenRA/OpenRA with one-click launch script (start-ra.cmd)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

OpenRA.Game/FileSystem/Folder.cs

@@ -0,0 +1,110 @@
+#region Copyright & License Information
+/*
+ * Copyright (c) The OpenRA Developers and Contributors
+ * 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, either version 3 of
+ * the License, or (at your option) any later version. For more
+ * information, see COPYING.
+ */
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+
+namespace OpenRA.FileSystem
+{
+	public sealed class Folder : IReadWritePackage
+	{
+		public string Name { get; }
+
+		public Folder(string path)
+		{
+			Name = path;
+			if (!Directory.Exists(path))
+				Directory.CreateDirectory(path);
+		}
+
+		public IEnumerable<string> Contents
+		{
+			get
+			{
+				// Order may vary on different file systems and it matters for hashing.
+				return Directory.GetFiles(Name, "*", SearchOption.TopDirectoryOnly)
+					.Concat(Directory.GetDirectories(Name))
+					.Select(Path.GetFileName)
+					.Order();
+			}
+		}
+
+		public Stream GetStream(string filename)
+		{
+			var combined = Path.Combine(Name, filename);
+			if (!File.Exists(combined))
+				return null;
+
+			try { return File.OpenRead(combined); }
+			catch { return null; }
+		}
+
+		public bool Contains(string filename)
+		{
+			var combined = Path.Combine(Name, filename);
+			return combined.StartsWith(Name, StringComparison.Ordinal) && File.Exists(combined);
+		}
+
+		public IReadOnlyPackage OpenPackage(string filename, FileSystem context)
+		{
+			var resolvedPath = Platform.ResolvePath(Path.Combine(Name, filename));
+			if (Directory.Exists(resolvedPath))
+				return new Folder(resolvedPath);
+
+			// Zip files loaded from Folders (and *only* from Folders) can be read-write
+			if (ZipFileLoader.TryParseReadWritePackage(resolvedPath, out var readWritePackage))
+				return readWritePackage;
+
+			// Other package types can be loaded normally
+			var s = GetStream(filename);
+			if (s == null)
+				return null;
+
+			if (context.TryParsePackage(s, filename, out var package))
+				return package;
+
+			s.Dispose();
+			return null;
+		}
+
+		public void Update(string filename, byte[] contents)
+		{
+			// HACK: ZipFiles can't be loaded as read-write from a stream, so we are
+			// forced to bypass the parent package and load them with their full path
+			// in FileSystem.OpenPackage.  Their internal name therefore contains the
+			// full parent path too.  We need to be careful to not add a second path
+			// prefix to these hacked packages.
+			var filePath = filename.StartsWith(Name, StringComparison.Ordinal) ? filename : Path.Combine(Name, filename);
+
+			Directory.CreateDirectory(Path.GetDirectoryName(filePath));
+			using (var s = File.Create(filePath))
+				s.Write(contents, 0, contents.Length);
+		}
+
+		public void Delete(string filename)
+		{
+			// HACK: ZipFiles can't be loaded as read-write from a stream, so we are
+			// forced to bypass the parent package and load them with their full path
+			// in FileSystem.OpenPackage.  Their internal name therefore contains the
+			// full parent path too.  We need to be careful to not add a second path
+			// prefix to these hacked packages.
+			var filePath = filename.StartsWith(Name, StringComparison.Ordinal) ? filename : Path.Combine(Name, filename);
+			if (Directory.Exists(filePath))
+				Directory.Delete(filePath, true);
+			else if (File.Exists(filePath))
+				File.Delete(filePath);
+		}
+
+		public void Dispose() { }
+	}
+}