code: public void writeTo (@Nonnull @WillNotClose final OutputStream aOS) throws IOException
    {
      aOS.write (m_aBuf, 0, m_nCount);
    }
docs: Writes the complete contents of this byte array output stream to the
  specified output stream argument, as if by calling the output stream's
  write method using <code>out.write(buf, 0, count)</code>. The content of
  this stream is not altered by calling this method.
  
  @param aOS
  the output stream to which to write the data. May not be
  <code>null</code>.
  @exception IOException
  if an I/O error occurs.