63 lines
2.2 KiB
C#
63 lines
2.2 KiB
C#
//
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// ArrayExtensions.cs
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//
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// Author:
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// Mike Becker <alcexhim@gmail.com>
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//
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// Copyright (c) 2019 Mike Becker
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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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using System;
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using System.Reflection;
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using System.Reflection.Emit;
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using System.Runtime.InteropServices;
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namespace MBS.Framework
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{
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public static class MemsetExtension
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{
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private static Action<IntPtr, byte, int> MemsetDelegate = null;
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/// <summary>
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/// Clears the specified <paramref name="array"/>, filling all values with the desired <paramref name="value"/>.
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/// </summary>
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/// <param name="array">The array to clear..</param>
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/// <param name="value">The value to set all items in the array to.</param>
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public static void Clear(this byte[] array, byte value = 0x00)
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{
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// Thanks https://stackoverflow.com/questions/1897555/what-is-the-equivalent-of-memset-in-c
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if (MemsetDelegate == null)
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{
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var dynamicMethod = new DynamicMethod("Memset", MethodAttributes.Public | MethodAttributes.Static, CallingConventions.Standard,
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null, new[] { typeof(IntPtr), typeof(byte), typeof(int) }, typeof(MemsetExtension), true);
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var generator = dynamicMethod.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.Initblk);
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generator.Emit(OpCodes.Ret);
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MemsetDelegate = (Action<IntPtr, byte, int>)dynamicMethod.CreateDelegate(typeof(Action<IntPtr, byte, int>));
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}
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var gcHandle = GCHandle.Alloc(array, GCHandleType.Pinned);
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MemsetDelegate(gcHandle.AddrOfPinnedObject(), value, array.Length);
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gcHandle.Free();
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}
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}
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}
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