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-rw-r--r--lib/ngtcp2_gaptr.c167
1 files changed, 167 insertions, 0 deletions
diff --git a/lib/ngtcp2_gaptr.c b/lib/ngtcp2_gaptr.c
new file mode 100644
index 0000000..87c2389
--- /dev/null
+++ b/lib/ngtcp2_gaptr.c
@@ -0,0 +1,167 @@
+/*
+ * 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};
+ int rv;
+
+ rv = ngtcp2_ksl_insert(&gaptr->gap, NULL, &range, NULL);
+ if (rv != 0) {
+ return rv;
+ }
+
+ return 0;
+}
+
+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;
+ ngtcp2_range r;
+
+ if (ngtcp2_ksl_len(&gaptr->gap) == 0) {
+ return 0;
+ }
+
+ it = ngtcp2_ksl_begin(&gaptr->gap);
+ r = *(ngtcp2_range *)ngtcp2_ksl_it_key(&it);
+
+ return r.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 k;
+ 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);
+ k = *(ngtcp2_range *)ngtcp2_ksl_it_key(&it);
+ m = ngtcp2_range_intersect(&q, &k);
+
+ 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);
+}