GMimeContentType *content_type = g_mime_object_get_content_type (meta);
const bool leaf = GMIME_IS_PART (node->part);
GMimeStream *stream = params->out_stream;
GMimeContentType *content_type = g_mime_object_get_content_type (meta);
const bool leaf = GMIME_IS_PART (node->part);
GMimeStream *stream = params->out_stream;