+ Z_PresentRequest *pr_req = 0;
+ Z_SearchRequest *sr_req = 0;
+
+ const char *input_schema = 0;
+ Odr_oid *input_syntax = 0;
+
+ if (gdu_req && gdu_req->which == Z_GDU_Z3950 &&
+ gdu_req->u.z3950->which == Z_APDU_presentRequest)
+ {
+ pr_req = gdu_req->u.z3950->u.presentRequest;
+
+ input_schema =
+ mp_util::record_composition_to_esn(pr_req->recordComposition);
+ input_syntax = pr_req->preferredRecordSyntax;
+ }
+ else if (gdu_req && gdu_req->which == Z_GDU_Z3950 &&
+ gdu_req->u.z3950->which == Z_APDU_searchRequest)
+ {
+ sr_req = gdu_req->u.z3950->u.searchRequest;
+
+ input_syntax = sr_req->preferredRecordSyntax;
+
+ // we don't know how many hits we're going to get and therefore
+ // the effective element set name.. Therefore we can only allow
+ // two cases.. Both equal or absent.. If not, we'll just have to
+ // disable the piggyback!
+ if (sr_req->smallSetElementSetNames
+ &&
+ sr_req->mediumSetElementSetNames
+ &&
+ sr_req->smallSetElementSetNames->which == Z_ElementSetNames_generic
+ &&
+ sr_req->mediumSetElementSetNames->which == Z_ElementSetNames_generic
+ &&
+ !strcmp(sr_req->smallSetElementSetNames->u.generic,
+ sr_req->mediumSetElementSetNames->u.generic))
+ {
+ input_schema = sr_req->smallSetElementSetNames->u.generic;
+ }
+ else if (!sr_req->smallSetElementSetNames &&
+ !sr_req->mediumSetElementSetNames)
+ ; // input_schema is 0 already
+ else
+ {
+ // disable piggyback (perhaps it was disabled already)
+ *sr_req->smallSetUpperBound = 0;
+ *sr_req->largeSetLowerBound = 0;
+ *sr_req->mediumSetPresentNumber = 0;
+ package.move();
+ return;
+ }
+ // we can handle it in record_transform.
+ }
+ else