public unsafe override byte[] ToArray() {
if (!_unmanagedStream._isOpen) __Error.StreamIsClosed();
if (!_unmanagedStream.CanRead) __Error.ReadNotSupported();
byte[] buffer = new byte[_unmanagedStream.Length];
Buffer.memcpy(_unmanagedStream.Pointer, 0, buffer, 0, (int) _unmanagedStream.Length);
return buffer;
}