hondacrx
92 lines
3.5 KiB
C#
92 lines
3.5 KiB
C#
/*
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* Copyright (C) 2012-2018 CypherCore <http://github.com/CypherCore>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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using System.Reflection.Emit;
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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namespace Framework.IO
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{
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public static class FastStruct<T> where T : struct
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{
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private delegate T LoadFromByteRefDelegate(ref byte source);
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private delegate void CopyMemoryDelegate(ref T dest, ref byte src, int count);
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private readonly static LoadFromByteRefDelegate LoadFromByteRef = BuildLoadFromByteRefMethod();
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private readonly static CopyMemoryDelegate CopyMemory = BuildCopyMemoryMethod();
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public static readonly int Size = Marshal.SizeOf<T>();
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private static LoadFromByteRefDelegate BuildLoadFromByteRefMethod()
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{
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var methodLoadFromByteRef = new DynamicMethod("LoadFromByteRef<" + typeof(T).FullName + ">",
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typeof(T), new[] { typeof(byte).MakeByRefType() }, typeof(FastStruct<T>));
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ILGenerator generator = methodLoadFromByteRef.GetILGenerator();
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generator.Emit(OpCodes.Ldarg_0);
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generator.Emit(OpCodes.Ldobj, typeof(T));
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generator.Emit(OpCodes.Ret);
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return (LoadFromByteRefDelegate)methodLoadFromByteRef.CreateDelegate(typeof(LoadFromByteRefDelegate));
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}
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private static CopyMemoryDelegate BuildCopyMemoryMethod()
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{
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var methodCopyMemory = new DynamicMethod("CopyMemory<" + typeof(T).FullName + ">",
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typeof(void), new[] { typeof(T).MakeByRefType(), typeof(byte).MakeByRefType(), typeof(int) }, typeof(FastStruct<T>));
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ILGenerator generator = methodCopyMemory.GetILGenerator();
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generator.Emit(OpCodes.Ldarg_0);
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generator.Emit(OpCodes.Ldarg_1);
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generator.Emit(OpCodes.Ldarg_2);
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generator.Emit(OpCodes.Cpblk);
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generator.Emit(OpCodes.Ret);
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return (CopyMemoryDelegate)methodCopyMemory.CreateDelegate(typeof(CopyMemoryDelegate));
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static T ArrayToStructure(byte[] src)
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{
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return LoadFromByteRef(ref src[0]);
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static T ArrayToStructure(byte[] src, int offset)
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{
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return LoadFromByteRef(ref src[offset]);
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static T ArrayToStructure(ref byte src)
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{
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return LoadFromByteRef(ref src);
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static T[] ReadArray(byte[] source)
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{
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T[] buffer = new T[source.Length / Size];
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if (source.Length > 0)
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CopyMemory(ref buffer[0], ref source[0], source.Length);
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return buffer;
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}
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}
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}
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