static struct ccn_charbuf *
resolve_templ(struct ccn_charbuf *templ, unsigned const char *vcomp, int size)
{
if (templ == NULL)
templ = ccn_charbuf_create();
if (size < 3 || size > 16) {
ccn_charbuf_destroy(&templ);
return(NULL);
}
templ->length = 0;
ccn_charbuf_append_tt(templ, CCN_DTAG_Interest, CCN_DTAG);
ccn_charbuf_append_tt(templ, CCN_DTAG_Name, CCN_DTAG);
ccn_charbuf_append_closer(templ); /* </Name> */
ccn_charbuf_append_tt(templ, CCN_DTAG_Exclude, CCN_DTAG);
append_filter_all(templ);
ccn_charbuf_append_tt(templ, CCN_DTAG_Component, CCN_DTAG);
ccn_charbuf_append_tt(templ, size, CCN_BLOB);
ccn_charbuf_append(templ, vcomp, size);
ccn_charbuf_append_closer(templ); /* </Component> */
append_future_vcomp(templ);
append_filter_all(templ);
ccn_charbuf_append_closer(templ); /* </Exclude> */
answer_highest(templ);
answer_passive(templ);
ccn_charbuf_append_closer(templ); /* </Interest> */
return(templ);
}
static struct ccn_charbuf *
create_passive_templ(void)
{
struct ccn_charbuf *templ = ccn_charbuf_create();
ccnb_element_begin(templ, CCN_DTAG_Interest);
ccnb_element_begin(templ, CCN_DTAG_Name);
ccnb_element_end(templ); /* </Name> */
answer_passive(templ);
ccnb_element_end(templ); /* </Interest> */
return(templ);
}
static struct ccn_charbuf *
create_passive_templ(void)
{
struct ccn_charbuf *templ = ccn_charbuf_create();
ccn_charbuf_append_tt(templ, CCN_DTAG_Interest, CCN_DTAG);
ccn_charbuf_append_tt(templ, CCN_DTAG_Name, CCN_DTAG);
ccn_charbuf_append_closer(templ); /* </Name> */
answer_passive(templ);
ccn_charbuf_append_closer(templ); /* </Interest> */
return(templ);
}
/*
* 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 ccn_traversal *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> */
if (data->n_excl != 0) {
ccnb_element_begin(templ, CCN_DTAG_Exclude);
if ((data->flags & EXCLUDE_LOW) != 0)
append_Any_filter(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_Any_filter(templ);
ccnb_element_end(templ); /* </Exclude> */
}
answer_passive(templ, (data->flags & ALLOW_STALE) != 0);
if ((data->flags & LOCAL_SCOPE) != 0)
local_scope(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);
}
/*
* 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();
ccn_charbuf_append_tt(templ, CCN_DTAG_Interest, CCN_DTAG);
ccn_charbuf_append_tt(templ, CCN_DTAG_Name, CCN_DTAG);
ccn_charbuf_append_closer(templ); /* </Name> */
ccn_charbuf_append_tt(templ, CCN_DTAG_Exclude, CCN_DTAG);
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);
ccn_charbuf_append_closer(templ); /* </Exclude> */
answer_passive(templ);
ccn_charbuf_append_closer(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);
}
static struct ndn_charbuf *
resolve_templ(struct ndn_charbuf *templ, unsigned const char *vcomp,
int size, int lifetime, int versioning_flags)
{
if (templ == NULL)
templ = ndn_charbuf_create();
if (size < 3 || size > 16) {
ndn_charbuf_destroy(&templ);
return(NULL);
}
templ->length = 0;
ndn_charbuf_append_tt(templ, NDN_DTAG_Interest, NDN_DTAG);
ndn_charbuf_append_tt(templ, NDN_DTAG_Name, NDN_DTAG);
ndn_charbuf_append_closer(templ); /* </Name> */
ndn_charbuf_append_tt(templ, NDN_DTAG_Exclude, NDN_DTAG);
append_filter_all(templ);
ndn_charbuf_append_tt(templ, NDN_DTAG_Component, NDN_DTAG);
ndn_charbuf_append_tt(templ, size, NDN_BLOB);
ndn_charbuf_append(templ, vcomp, size);
ndn_charbuf_append_closer(templ); /* </Component> */
append_future_vcomp(templ);
append_filter_all(templ);
ndn_charbuf_append_closer(templ); /* </Exclude> */
answer_highest(templ);
answer_passive(templ);
if ((versioning_flags & NDN_V_SCOPE2) != 0)
ndnb_tagged_putf(templ, NDN_DTAG_Scope, "%d", 2);
else if ((versioning_flags & NDN_V_SCOPE1) != 0)
ndnb_tagged_putf(templ, NDN_DTAG_Scope, "%d", 1);
else if ((versioning_flags & NDN_V_SCOPE0) != 0)
ndnb_tagged_putf(templ, NDN_DTAG_Scope, "%d", 0);
if (lifetime > 0)
ndnb_append_tagged_binary_number(templ, NDN_DTAG_InterestLifetime, lifetime);
ndn_charbuf_append_closer(templ); /* </Interest> */
return(templ);
}
