Everything is now OpenRA, not OpenRa

OpenRA.Game/Sync.cs

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+#region Copyright & License Information
+/*
+ * Copyright 2007,2009,2010 Chris Forbes, Robert Pepperell, Matthew Bowra-Dean, Paul Chote, Alli Witheford.
+ * This file is part of OpenRA.
+ * 
+ *  OpenRA is free software: you can redistribute it and/or modify
+ *  it 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.
+ * 
+ *  OpenRA is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ * 
+ *  You should have received a copy of the GNU General Public License
+ *  along with OpenRA.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#endregion
+
+using System;
+using System.Linq;
+using System.Reflection;
+using System.Reflection.Emit;
+using OpenRA.FileFormats;
+
+namespace OpenRA
+{
+	public class SyncAttribute : Attribute { }
+
+	static class Sync
+	{
+		static Cache<Type, Func<object, int>> hashFuncCache = new Cache<Type, Func<object, int>>( t => GenerateHashFunc( t ) );
+
+		public static int CalculateSyncHash( object obj )
+		{
+			return hashFuncCache[ obj.GetType() ]( obj );
+		}
+
+		public static Func<object,int> GenerateHashFunc( Type t )
+		{
+			var d = new DynamicMethod( "hash_{0}".F( t.Name ), typeof( int ), new Type[] { typeof( object ) }, t );
+			var il = d.GetILGenerator();
+			var this_ = il.DeclareLocal( t ).LocalIndex;
+			il.Emit( OpCodes.Ldarg_0 );
+			il.Emit( OpCodes.Castclass, t );
+			il.Emit( OpCodes.Stloc, this_ );
+			il.Emit( OpCodes.Ldc_I4_0 );
+
+			const BindingFlags bf = BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance;
+			foreach( var field in t.GetFields( bf ).Where( x => x.GetCustomAttributes( typeof( SyncAttribute ), true ).Length != 0 ) )
+			{
+				il.Emit( OpCodes.Ldloc, this_ );
+				il.Emit( OpCodes.Ldfld, field );
+
+				if( field.FieldType == typeof( int ) )
+				{
+					il.Emit( OpCodes.Xor );
+				}
+				else if( field.FieldType == typeof( bool ) )
+				{
+					var l = il.DefineLabel();
+					il.Emit( OpCodes.Ldc_I4, 0xaaa );
+					il.Emit( OpCodes.Brtrue, l );
+					il.Emit( OpCodes.Pop );
+					il.Emit( OpCodes.Ldc_I4, 0x555 );
+					il.MarkLabel( l );
+					il.Emit( OpCodes.Xor );
+				}
+				else if( field.FieldType == typeof( int2 ) )
+				{
+					il.EmitCall( OpCodes.Call, ( (Func<int2, int>)hash_int2 ).Method, null );
+					il.Emit( OpCodes.Xor );
+				}
+				else if( field.FieldType == typeof( TypeDictionary ) )
+				{
+					il.EmitCall( OpCodes.Call, ( (Func<TypeDictionary, int>)hash_tdict ).Method, null );
+					il.Emit( OpCodes.Xor );
+				}
+				else if( field.FieldType == typeof( Actor ) )
+				{
+					il.EmitCall( OpCodes.Call, ( (Func<Actor, int>)hash_actor ).Method, null );
+					il.Emit( OpCodes.Xor );
+				}
+				else if( field.FieldType == typeof( Player ) )
+				{
+					il.EmitCall( OpCodes.Call, ( (Func<Player, int>)hash_player ).Method, null );
+					il.Emit( OpCodes.Xor );
+				}
+				else
+					throw new NotImplementedException( "SyncAttribute on unhashable field" );
+			}
+
+			il.Emit( OpCodes.Ret );
+			return (Func<object,int>)d.CreateDelegate( typeof( Func<object,int> ) );
+		}
+
+		internal static int hash_int2( int2 i2 )
+		{
+			return ( ( i2.X * 5 ) ^ ( i2.Y * 3 ) ) / 4;
+		}
+
+		internal static int hash_tdict( TypeDictionary d )
+		{
+			int ret = 0;
+			foreach( var o in d )
+				ret += CalculateSyncHash( o );
+			return ret;
+		}
+
+		internal static int hash_actor( Actor a )
+		{
+			if( a != null )
+				return (int)( a.ActorID << 16 );
+			return 0;
+		}
+
+		internal static int hash_player( Player p )
+		{
+			if( p != null )
+				return p.Index * 0x567;
+			return 0;
+		}
+	}
+}