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implement 'memset' equivalent in .NET as described by stackoverflow answer 1897555

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Michael Becker 2020-08-07 01:21:02 -04:00
parent 92f23aab04
commit 22b4be8a8b
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1
MBS.Framework/MBS.Framework.csproj
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@ -70,6 +70,7 @@
<Compile Include="SeekDirection.cs" />
<Compile Include="IO\File.cs" />
<Compile Include="IO\CaseSensitiveHandling.cs" />
<Compile Include="MemsetExtension.cs" />
</ItemGroup>
<ItemGroup>
<Folder Include="Logic\" />

62
MBS.Framework/MemsetExtension.cs Normal file
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@ -0,0 +1,62 @@
//
// ArrayExtensions.cs
//
// Author:
// Mike Becker <alcexhim@gmail.com>
//
// Copyright (c) 2019 Mike Becker
//
// 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.Reflection;
using System.Reflection.Emit;
using System.Runtime.InteropServices;
namespace MBS.Framework
{
public static class MemsetExtension
{
private static Action<IntPtr, byte, int> MemsetDelegate = null;
/// <summary>
/// Clears the specified <paramref name="array"/>, filling all values with the desired <paramref name="value"/>.
/// </summary>
/// <param name="array">The array to clear..</param>
/// <param name="value">The value to set all items in the array to.</param>
public static void Clear(this byte[] array, byte value = 0x00)
{
// Thanks https://stackoverflow.com/questions/1897555/what-is-the-equivalent-of-memset-in-c
if (MemsetDelegate == null)
{
var dynamicMethod = new DynamicMethod("Memset", MethodAttributes.Public | MethodAttributes.Static, CallingConventions.Standard,
null, new[] { typeof(IntPtr), typeof(byte), typeof(int) }, typeof(MemsetExtension), true);
var generator = dynamicMethod.GetILGenerator();
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldarg_1);
generator.Emit(OpCodes.Ldarg_2);
generator.Emit(OpCodes.Initblk);
generator.Emit(OpCodes.Ret);
MemsetDelegate = (Action<IntPtr, byte, int>)dynamicMethod.CreateDelegate(typeof(Action<IntPtr, byte, int>));
}
var gcHandle = GCHandle.Alloc(array, GCHandleType.Pinned);
MemsetDelegate(gcHandle.AddrOfPinnedObject(), value, array.Length);
gcHandle.Free();
}
}
}