/*
* Construct and send a new interest that uses the exclusion list.
* Return -1 if not sent because of packet size, 0 for success.
*/
static int
express_my_interest(struct ccn *h,
struct ccn_closure *selfp,
struct ccn_charbuf *name)
{
int ans;
struct ccn_charbuf *templ = NULL;
int i;
struct upcalldata *data = get_my_data(selfp);
templ = ccn_charbuf_create();
ccnb_element_begin(templ, CCN_DTAG_Interest);
ccnb_element_begin(templ, CCN_DTAG_Name);
ccnb_element_end(templ); /* </Name> */
ccnb_element_begin(templ, CCN_DTAG_Exclude);
if ((data->flags & EXCLUDE_LOW) != 0)
append_bf_all(templ);
for (i = 0; i < data->n_excl; i++) {
struct ccn_charbuf *comp = data->excl[i];
if (comp->length < 4) abort();
ccn_charbuf_append(templ, comp->buf + 1, comp->length - 2);
}
if ((data->flags & EXCLUDE_HIGH) != 0)
append_bf_all(templ);
ccnb_element_end(templ); /* </Exclude> */
answer_passive(templ);
ccnb_element_end(templ); /* </Interest> */
if (templ->length + name->length > data->warn + 2) {
fprintf(stderr, "*** Interest packet is %d bytes\n", (int)templ->length);
data->warn = data->warn * 8 / 5;
}
if (templ->length + name->length > 1450 && data->n_excl > 3)
ans = -1;
else {
ccn_express_interest(h, name, selfp, templ);
ans = 0;
}
ccn_charbuf_destroy(&templ);
return(ans);
}
void GroupManager::expressEnumInterest(struct ccn_charbuf *interest, QList<QString> &toExclude) {
if (toExclude.size() == 0) {
mutex_trylock();
int res = ccn_express_interest(ccn, interest, join_closure, NULL);
mutex_unlock();
if (res < 0) {
critical("express interest failed!");
}
ccn_charbuf_destroy(&interest);
return;
}
struct ccn_charbuf **excl = NULL;
if (toExclude.size() > 0) {
excl = new ccn_charbuf *[toExclude.size()];
for (int i = 0; i < toExclude.size(); i ++) {
QString compName = toExclude.at(i);
struct ccn_charbuf *comp = ccn_charbuf_create();
ccn_name_init(comp);
ccn_name_append_str(comp, compName.toStdString().c_str());
excl[i] = comp;
comp = NULL;
}
qsort(excl, toExclude.size(), sizeof(excl[0]), &namecompare);
}
int begin = 0;
bool excludeLow = false;
bool excludeHigh = true;
while (begin < toExclude.size()) {
if (begin != 0) {
excludeLow = true;
}
struct ccn_charbuf *templ = ccn_charbuf_create();
ccn_charbuf_append_tt(templ, CCN_DTAG_Interest, CCN_DTAG); // <Interest>
ccn_charbuf_append_tt(templ, CCN_DTAG_Name, CCN_DTAG); // <Name>
ccn_charbuf_append_closer(templ); // </Name>
ccn_charbuf_append_tt(templ, CCN_DTAG_Exclude, CCN_DTAG); // <Exclude>
if (excludeLow) {
append_bf_all(templ);
}
for (; begin < toExclude.size(); begin++) {
struct ccn_charbuf *comp = excl[begin];
if (comp->length < 4) abort();
// we are being conservative here
if (interest->length + templ->length + comp->length > 1350) {
break;
}
ccn_charbuf_append(templ, comp->buf + 1, comp->length - 2);
}
if (begin == toExclude.size()) {
excludeHigh = false;
}
if (excludeHigh) {
append_bf_all(templ);
}
ccn_charbuf_append_closer(templ); // </Exclude>
ccn_charbuf_append_closer(templ); // </Interest>
mutex_trylock();
int res = ccn_express_interest(ccn, interest, join_closure, templ);
mutex_unlock();
if (res < 0) {
critical("express interest failed!");
}
ccn_charbuf_destroy(&templ);
}
ccn_charbuf_destroy(&interest);
for (int i = 0; i < toExclude.size(); i++) {
ccn_charbuf_destroy(&excl[i]);
}
if (excl != NULL) {
delete []excl;
}
}
