throw new IllegalStateException(); // should never happen! case 6: len = _endp.flush(_header, _buffer, null); break; case 5: len = _endp.flush(_header, _content, null); break; case 4: len = _endp.flush(_header); break; case 3: throw new IllegalStateException(); // should never happen! case 2: len = _endp.flush(_buffer); break; case 1: len = _endp.flush(_content); break; case 0: