1 /*
2 * ngtcp2
3 *
4 * Copyright (c) 2017 ngtcp2 contributors
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining
7 * a copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sublicense, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be
15 * included in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
20 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
21 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
22 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
23 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
24 */
25 #include "ngtcp2_idtr.h"
26
27 #include <assert.h>
28
ngtcp2_idtr_init(ngtcp2_idtr * idtr,int server,const ngtcp2_mem * mem)29 void ngtcp2_idtr_init(ngtcp2_idtr *idtr, int server, const ngtcp2_mem *mem) {
30 ngtcp2_gaptr_init(&idtr->gap, mem);
31
32 idtr->server = server;
33 }
34
ngtcp2_idtr_free(ngtcp2_idtr * idtr)35 void ngtcp2_idtr_free(ngtcp2_idtr *idtr) {
36 if (idtr == NULL) {
37 return;
38 }
39
40 ngtcp2_gaptr_free(&idtr->gap);
41 }
42
43 /*
44 * id_from_stream_id translates |stream_id| to id space used by
45 * ngtcp2_idtr.
46 */
id_from_stream_id(int64_t stream_id)47 static uint64_t id_from_stream_id(int64_t stream_id) {
48 return (uint64_t)(stream_id >> 2);
49 }
50
ngtcp2_idtr_open(ngtcp2_idtr * idtr,int64_t stream_id)51 int ngtcp2_idtr_open(ngtcp2_idtr *idtr, int64_t stream_id) {
52 uint64_t q;
53
54 assert((idtr->server && (stream_id % 2)) ||
55 (!idtr->server && (stream_id % 2)) == 0);
56
57 q = id_from_stream_id(stream_id);
58
59 if (ngtcp2_gaptr_is_pushed(&idtr->gap, q, 1)) {
60 return NGTCP2_ERR_STREAM_IN_USE;
61 }
62
63 return ngtcp2_gaptr_push(&idtr->gap, q, 1);
64 }
65
ngtcp2_idtr_is_open(ngtcp2_idtr * idtr,int64_t stream_id)66 int ngtcp2_idtr_is_open(ngtcp2_idtr *idtr, int64_t stream_id) {
67 uint64_t q;
68
69 assert((idtr->server && (stream_id % 2)) ||
70 (!idtr->server && (stream_id % 2)) == 0);
71
72 q = id_from_stream_id(stream_id);
73
74 return ngtcp2_gaptr_is_pushed(&idtr->gap, q, 1);
75 }
76
ngtcp2_idtr_first_gap(ngtcp2_idtr * idtr)77 uint64_t ngtcp2_idtr_first_gap(ngtcp2_idtr *idtr) {
78 return ngtcp2_gaptr_first_gap_offset(&idtr->gap);
79 }
80