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.Mods.Cnc/FileFormats/IdxReader.cs

@@ -0,0 +1,44 @@
+#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.Collections.Generic;
+using System.IO;
+
+namespace OpenRA.Mods.Cnc.FileFormats
+{
+	public class IdxReader
+	{
+		public readonly int SoundCount;
+		public List<IdxEntry> Entries;
+
+		public IdxReader(Stream s)
+		{
+			s.Seek(0, SeekOrigin.Begin);
+
+			var id = s.ReadASCII(4);
+
+			if (id != "GABA")
+				throw new InvalidDataException($"Unable to load Idx file, did not find magic id, found {id} instead");
+
+			var two = s.ReadInt32();
+
+			if (two != 2)
+				throw new InvalidDataException($"Unable to load Idx file, did not find magic number 2, found {two} instead");
+
+			SoundCount = s.ReadInt32();
+
+			Entries = [];
+
+			for (var i = 0; i < SoundCount; i++)
+				Entries.Add(new IdxEntry(s));
+		}
+	}
+}