508     pb_ostream_t substream = PB_OSTREAM_SIZING;  in pb_encode_submessage()  local
512     if (!pb_encode(&substream, fields, src_struct))  in pb_encode_submessage()
515         stream->errmsg = substream.errmsg;  in pb_encode_submessage()
520     size = substream.bytes_written;  in pb_encode_submessage()
533     substream.callback = stream->callback;  in pb_encode_submessage()
534     substream.state = stream->state;  in pb_encode_submessage()
535     substream.max_size = size;  in pb_encode_submessage()
536     substream.bytes_written = 0;  in pb_encode_submessage()
538     substream.errmsg = NULL;  in pb_encode_submessage()
541     status = pb_encode(&substream, fields, src_struct);  in pb_encode_submessage()
543     stream->bytes_written += substream.bytes_written;  in pb_encode_submessage()
544     stream->state = substream.state;  in pb_encode_submessage()
546     stream->errmsg = substream.errmsg;  in pb_encode_submessage()
549     if (substream.bytes_written != size)  in pb_encode_submessage()