Move classic-mod package loaders and support files to Mods.Cnc.

OpenRA.Mods.Cnc/FileSystem/PackageEntry.cs

@@ -0,0 +1,111 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2017 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;
+using System.Collections.Generic;
+using System.IO;
+using System.Text;
+using OpenRA.Mods.Cnc.FileFormats;
+
+namespace OpenRA.Mods.Cnc.FileSystem
+{
+	public enum PackageHashType { Classic, CRC32 }
+
+	public class PackageEntry
+	{
+		public const int Size = 12;
+		public readonly uint Hash;
+		public readonly uint Offset;
+		public readonly uint Length;
+
+		public PackageEntry(uint hash, uint offset, uint length)
+		{
+			Hash = hash;
+			Offset = offset;
+			Length = length;
+		}
+
+		public PackageEntry(Stream s)
+		{
+			Hash = s.ReadUInt32();
+			Offset = s.ReadUInt32();
+			Length = s.ReadUInt32();
+		}
+
+		public void Write(BinaryWriter w)
+		{
+			w.Write(Hash);
+			w.Write(Offset);
+			w.Write(Length);
+		}
+
+		public override string ToString()
+		{
+			string filename;
+			if (names.TryGetValue(Hash, out filename))
+				return "{0} - offset 0x{1:x8} - length 0x{2:x8}".F(filename, Offset, Length);
+			else
+				return "0x{0:x8} - offset 0x{1:x8} - length 0x{2:x8}".F(Hash, Offset, Length);
+		}
+
+		public static uint HashFilename(string name, PackageHashType type)
+		{
+			switch (type)
+			{
+				case PackageHashType.Classic:
+					{
+						name = name.ToUpperInvariant();
+						if (name.Length % 4 != 0)
+							name = name.PadRight(name.Length + (4 - name.Length % 4), '\0');
+
+						using (var ms = new MemoryStream(Encoding.ASCII.GetBytes(name)))
+						{
+							var len = name.Length >> 2;
+							uint result = 0;
+
+							while (len-- != 0)
+								result = ((result << 1) | (result >> 31)) + ms.ReadUInt32();
+
+							return result;
+						}
+					}
+
+				case PackageHashType.CRC32:
+					{
+						name = name.ToUpperInvariant();
+						var l = name.Length;
+						var a = l >> 2;
+						if ((l & 3) != 0)
+						{
+							name += (char)(l - (a << 2));
+							var i = 3 - (l & 3);
+							while (i-- != 0)
+								name += name[a << 2];
+						}
+
+						return CRC32.Calculate(Encoding.ASCII.GetBytes(name));
+					}
+
+				default: throw new NotImplementedException("Unknown hash type `{0}`".F(type));
+			}
+		}
+
+		static Dictionary<uint, string> names = new Dictionary<uint, string>();
+
+		public static void AddStandardName(string s)
+		{
+			var hash = HashFilename(s, PackageHashType.Classic); // RA1 and TD
+			names.Add(hash, s);
+			var crcHash = HashFilename(s, PackageHashType.CRC32); // TS
+			names.Add(crcHash, s);
+		}
+	}
+}