private static async Task CopyToHalfAsync(Stream source, AsyncStream destination, int bufferSize, CancellationToken cancellationToken)
{
byte[] buffer = new byte[bufferSize];
while (true)
{
int bytesRead = await ReadAsyncInternal(source, buffer, 0, buffer.Length, cancellationToken).ConfigureAwait(false);
if (bytesRead == 0)
{
break;
}
await destination.WriteAsync(buffer, 0, bytesRead, cancellationToken).ConfigureAwait(false);
}
}
