ImmutableByteArrayInterop.cs

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using System.Collections.Immutable;
using System.Runtime.InteropServices;
 
namespace System.Reflection.Internal;
 
internal static class ImmutableByteArrayInterop
{
    [StructLayout(LayoutKind.Explicit)]
    private struct ByteArrayUnion
    {
        [FieldOffset(0)]
        internal byte[] UnderlyingArray;
 
        [FieldOffset(0)]
        internal ImmutableArray<byte> ImmutableArray;
    }
 
    internal static ImmutableArray<byte> DangerousCreateFromUnderlyingArray(ref byte[]? array)
    {
        byte[] underlyingArray = array;
        array = null;
        ByteArrayUnion byteArrayUnion = default(ByteArrayUnion);
        byteArrayUnion.UnderlyingArray = underlyingArray;
        return byteArrayUnion.ImmutableArray;
    }
 
    internal static byte[]? DangerousGetUnderlyingArray(ImmutableArray<byte> array)
    {
        ByteArrayUnion byteArrayUnion = default(ByteArrayUnion);
        byteArrayUnion.ImmutableArray = array;
        return byteArrayUnion.UnderlyingArray;
    }
}