PinnedBufferMemoryStream.cs

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using System.Runtime.InteropServices;
 
namespace System.IO;
 
internal sealed class PinnedBufferMemoryStream : UnmanagedMemoryStream
{
    private readonly byte[] _array;
 
    private GCHandle _pinningHandle;
 
    internal unsafe PinnedBufferMemoryStream(byte[] array)
    {
        _array = array;
        _pinningHandle = GCHandle.Alloc(array, GCHandleType.Pinned);
        int num = array.Length;
        fixed (byte* pointer = &MemoryMarshal.GetReference<byte>(array))
        {
            Initialize(pointer, num, num, FileAccess.Read);
        }
    }
 
    public override int Read(Span<byte> buffer)
    {
        return ReadCore(buffer);
    }
 
    public override void Write(ReadOnlySpan<byte> buffer)
    {
        WriteCore(buffer);
    }
 
    ~PinnedBufferMemoryStream()
    {
        Dispose(disposing: false);
    }
 
    protected override void Dispose(bool disposing)
    {
        if (_pinningHandle.IsAllocated)
        {
            _pinningHandle.Free();
        }
        base.Dispose(disposing);
    }
}