Updated DB2 structs

2018-02-26 13:13:54 -05:00
parent 0a3dfaba37
commit 82dca6de94
61 changed files with 2639 additions and 2517 deletions
@@ -0,0 +1,94 @@
+/*
+ * Copyright (C) 2012-2018 CypherCore <http://github.com/CypherCore>
+ * 
+ * This program 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.
+ *
+ * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Reflection.Emit;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+namespace Framework.IO
+{
+    public static class FastStruct<T> where T : struct
+    {
+        private delegate T LoadFromByteRefDelegate(ref byte source);
+        private delegate void CopyMemoryDelegate(ref T dest, ref byte src, int count);
+
+        private readonly static LoadFromByteRefDelegate LoadFromByteRef = BuildLoadFromByteRefMethod();
+        private readonly static CopyMemoryDelegate CopyMemory = BuildCopyMemoryMethod();
+
+        public static readonly int Size = Marshal.SizeOf<T>();
+
+        private static LoadFromByteRefDelegate BuildLoadFromByteRefMethod()
+        {
+            var methodLoadFromByteRef = new DynamicMethod("LoadFromByteRef<" + typeof(T).FullName + ">",
+                typeof(T), new[] { typeof(byte).MakeByRefType() }, typeof(FastStruct<T>));
+
+            ILGenerator generator = methodLoadFromByteRef.GetILGenerator();
+            generator.Emit(OpCodes.Ldarg_0);
+            generator.Emit(OpCodes.Ldobj, typeof(T));
+            generator.Emit(OpCodes.Ret);
+
+            return (LoadFromByteRefDelegate)methodLoadFromByteRef.CreateDelegate(typeof(LoadFromByteRefDelegate));
+        }
+
+        private static CopyMemoryDelegate BuildCopyMemoryMethod()
+        {
+            var methodCopyMemory = new DynamicMethod("CopyMemory<" + typeof(T).FullName + ">",
+                typeof(void), new[] { typeof(T).MakeByRefType(), typeof(byte).MakeByRefType(), typeof(int) }, typeof(FastStruct<T>));
+
+            ILGenerator generator = methodCopyMemory.GetILGenerator();
+            generator.Emit(OpCodes.Ldarg_0);
+            generator.Emit(OpCodes.Ldarg_1);
+            generator.Emit(OpCodes.Ldarg_2);
+            generator.Emit(OpCodes.Cpblk);
+            generator.Emit(OpCodes.Ret);
+
+            return (CopyMemoryDelegate)methodCopyMemory.CreateDelegate(typeof(CopyMemoryDelegate));
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static T ArrayToStructure(byte[] src)
+        {
+            return LoadFromByteRef(ref src[0]);
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static T ArrayToStructure(byte[] src, int offset)
+        {
+            return LoadFromByteRef(ref src[offset]);
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static T ArrayToStructure(ref byte src)
+        {
+            return LoadFromByteRef(ref src);
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static T[] ReadArray(byte[] source)
+        {
+            T[] buffer = new T[source.Length / Size];
+
+            if (source.Length > 0)
+                CopyMemory(ref buffer[0], ref source[0], source.Length);
+
+            return buffer;
+        }
+    }
+}