Add a .wsa file reader.

OpenRA.Mods.Cnc/VideoLoaders/WsaLoader.cs

@@ -0,0 +1,66 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2021 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, either version 3 of
+ * the License, or (at your option) any later version. For more
+ * information, see COPYING.
+ */
+#endregion
+
+using System.IO;
+using System.Linq;
+using OpenRA.Mods.Cnc.FileFormats;
+using OpenRA.Video;
+
+namespace OpenRA.Mods.Cnc.VideoLoaders
+{
+	public class WsaLoader : IVideoLoader
+	{
+		public bool TryParseVideo(Stream s, out IVideo video)
+		{
+			video = null;
+
+			if (!IsWsa(s))
+				return false;
+
+			video = new WsaReader(s);
+			return true;
+		}
+
+		bool IsWsa(Stream s)
+		{
+			var start = s.Position;
+
+			var frames = s.ReadUInt16();
+
+			var x = s.ReadUInt16();
+			var y = s.ReadUInt16();
+			var width = s.ReadUInt16();
+			var height = s.ReadUInt16();
+
+			if (width <= 0 || height <= 0)
+				return false;
+
+			var delta = s.ReadUInt16() + 37;
+
+			var flags = s.ReadUInt16();
+
+			var offsets = new uint[frames + 2];
+			for (var i = 0; i < offsets.Length; i++)
+				offsets[i] = s.ReadUInt32();
+
+			if (flags == 1)
+			{
+				var palette = StreamExts.ReadBytes(s, 768);
+				for (var i = 0; i < offsets.Length; i++)
+					offsets[i] += 768;
+			}
+
+			s.Position = start;
+
+			return s.Length == offsets.Last();
+		}
+	}
+}