UTF8BufferMarshaler.cs

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using System.Text;
 
namespace System.StubHelpers;
 
internal static class UTF8BufferMarshaler
{
    internal unsafe static IntPtr ConvertToNative(StringBuilder sb, IntPtr pNativeBuffer, int flags)
    {
        if (sb == null)
        {
            return IntPtr.Zero;
        }
        string text = sb.ToString();
        int byteCount = Encoding.UTF8.GetByteCount(text);
        byte* ptr = (byte*)(void*)pNativeBuffer;
        byteCount = text.GetBytesFromEncoding(ptr, byteCount, Encoding.UTF8);
        ptr[byteCount] = 0;
        return (IntPtr)ptr;
    }
 
    internal unsafe static void ConvertToManaged(StringBuilder sb, IntPtr pNative)
    {
        if (!(pNative == IntPtr.Zero))
        {
            byte* ptr = (byte*)(void*)pNative;
            int length = string.strlen(ptr);
            sb.ReplaceBufferUtf8Internal(new ReadOnlySpan<byte>(ptr, length));
        }
    }
}