util/data/msgencode.c

70  * a lookup of a name you know its closest match, and the parent from that
71  * closest match. These are possible compression targets.
94  * Find domain name in tree, returns exact and closest match.
98  * @param match: closest or exact match.
101  * @param matchlabels: number of labels that match with closest match.
199  * @param closest: match from previous lookup, used to compress dname.
207 	struct regional* region, struct compress_tree_node* closest,
214 	if(closest) uplabs = labs - closest->labs;
245 		prevnode->parent = closest;