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/*
* ngtcp2
*
* Copyright (c) 2017 ngtcp2 contributors
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "ngtcp2_gaptr.h"
#include <string.h>
#include <assert.h>
void ngtcp2_gaptr_init(ngtcp2_gaptr *gaptr, const ngtcp2_mem *mem) {
ngtcp2_ksl_init(&gaptr->gap, ngtcp2_ksl_range_compar, sizeof(ngtcp2_range),
mem);
gaptr->mem = mem;
}
static int gaptr_gap_init(ngtcp2_gaptr *gaptr) {
ngtcp2_range range = {0, UINT64_MAX};
return ngtcp2_ksl_insert(&gaptr->gap, NULL, &range, NULL);
}
void ngtcp2_gaptr_free(ngtcp2_gaptr *gaptr) {
if (gaptr == NULL) {
return;
}
ngtcp2_ksl_free(&gaptr->gap);
}
int ngtcp2_gaptr_push(ngtcp2_gaptr *gaptr, uint64_t offset, uint64_t datalen) {
int rv;
ngtcp2_range k, m, l, r, q = {offset, offset + datalen};
ngtcp2_ksl_it it;
if (ngtcp2_ksl_len(&gaptr->gap) == 0) {
rv = gaptr_gap_init(gaptr);
if (rv != 0) {
return rv;
}
}
it = ngtcp2_ksl_lower_bound_compar(&gaptr->gap, &q,
ngtcp2_ksl_range_exclusive_compar);
for (; !ngtcp2_ksl_it_end(&it);) {
k = *(ngtcp2_range *)ngtcp2_ksl_it_key(&it);
m = ngtcp2_range_intersect(&q, &k);
if (!ngtcp2_range_len(&m)) {
break;
}
if (ngtcp2_range_eq(&k, &m)) {
ngtcp2_ksl_remove_hint(&gaptr->gap, &it, &it, &k);
continue;
}
ngtcp2_range_cut(&l, &r, &k, &m);
if (ngtcp2_range_len(&l)) {
ngtcp2_ksl_update_key(&gaptr->gap, &k, &l);
if (ngtcp2_range_len(&r)) {
rv = ngtcp2_ksl_insert(&gaptr->gap, &it, &r, NULL);
if (rv != 0) {
return rv;
}
}
} else if (ngtcp2_range_len(&r)) {
ngtcp2_ksl_update_key(&gaptr->gap, &k, &r);
}
ngtcp2_ksl_it_next(&it);
}
return 0;
}
uint64_t ngtcp2_gaptr_first_gap_offset(ngtcp2_gaptr *gaptr) {
ngtcp2_ksl_it it;
if (ngtcp2_ksl_len(&gaptr->gap) == 0) {
return 0;
}
it = ngtcp2_ksl_begin(&gaptr->gap);
return ((ngtcp2_range *)ngtcp2_ksl_it_key(&it))->begin;
}
ngtcp2_range ngtcp2_gaptr_get_first_gap_after(ngtcp2_gaptr *gaptr,
uint64_t offset) {
ngtcp2_range q = {offset, offset + 1};
ngtcp2_ksl_it it;
if (ngtcp2_ksl_len(&gaptr->gap) == 0) {
ngtcp2_range r = {0, UINT64_MAX};
return r;
}
it = ngtcp2_ksl_lower_bound_compar(&gaptr->gap, &q,
ngtcp2_ksl_range_exclusive_compar);
assert(!ngtcp2_ksl_it_end(&it));
return *(ngtcp2_range *)ngtcp2_ksl_it_key(&it);
}
int ngtcp2_gaptr_is_pushed(ngtcp2_gaptr *gaptr, uint64_t offset,
uint64_t datalen) {
ngtcp2_range q = {offset, offset + datalen};
ngtcp2_ksl_it it;
ngtcp2_range m;
if (ngtcp2_ksl_len(&gaptr->gap) == 0) {
return 0;
}
it = ngtcp2_ksl_lower_bound_compar(&gaptr->gap, &q,
ngtcp2_ksl_range_exclusive_compar);
m = ngtcp2_range_intersect(&q, (ngtcp2_range *)ngtcp2_ksl_it_key(&it));
return ngtcp2_range_len(&m) == 0;
}
void ngtcp2_gaptr_drop_first_gap(ngtcp2_gaptr *gaptr) {
ngtcp2_ksl_it it;
ngtcp2_range r;
if (ngtcp2_ksl_len(&gaptr->gap) == 0) {
return;
}
it = ngtcp2_ksl_begin(&gaptr->gap);
assert(!ngtcp2_ksl_it_end(&it));
r = *(ngtcp2_range *)ngtcp2_ksl_it_key(&it);
ngtcp2_ksl_remove_hint(&gaptr->gap, NULL, &it, &r);
}
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