1 /*
2 * nghttp3
3 *
4 * Copyright (c) 2019 nghttp3 contributors
5 * Copyright (c) 2017 ngtcp2 contributors
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining
8 * a copy of this software and associated documentation files (the
9 * "Software"), to deal in the Software without restriction, including
10 * without limitation the rights to use, copy, modify, merge, publish,
11 * distribute, sublicense, and/or sell copies of the Software, and to
12 * permit persons to whom the Software is furnished to do so, subject to
13 * the following conditions:
14 *
15 * The above copyright notice and this permission notice shall be
16 * included in all copies or substantial portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
19 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
21 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
22 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
23 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
24 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 */
26 #include "nghttp3_idtr.h"
27
28 #include <assert.h>
29
nghttp3_idtr_init(nghttp3_idtr *idtr, int server, const nghttp3_mem *mem)30 void nghttp3_idtr_init(nghttp3_idtr *idtr, int server, const nghttp3_mem *mem) {
31 nghttp3_gaptr_init(&idtr->gap, mem);
32
33 idtr->server = server;
34 }
35
nghttp3_idtr_free(nghttp3_idtr *idtr)36 void nghttp3_idtr_free(nghttp3_idtr *idtr) {
37 if (idtr == NULL) {
38 return;
39 }
40
41 nghttp3_gaptr_free(&idtr->gap);
42 }
43
44 /*
45 * id_from_stream_id translates |stream_id| to id space used by
46 * nghttp3_idtr.
47 */
id_from_stream_id(int64_t stream_id)48 static uint64_t id_from_stream_id(int64_t stream_id) {
49 return (uint64_t)(stream_id >> 2);
50 }
51
nghttp3_idtr_open(nghttp3_idtr *idtr, int64_t stream_id)52 int nghttp3_idtr_open(nghttp3_idtr *idtr, int64_t stream_id) {
53 uint64_t q;
54
55 assert((idtr->server && (stream_id % 2)) ||
56 (!idtr->server && (stream_id % 2)) == 0);
57
58 q = id_from_stream_id(stream_id);
59
60 if (nghttp3_gaptr_is_pushed(&idtr->gap, q, 1)) {
61 return NGHTTP3_ERR_STREAM_IN_USE;
62 }
63
64 return nghttp3_gaptr_push(&idtr->gap, q, 1);
65 }
66
nghttp3_idtr_is_open(nghttp3_idtr *idtr, int64_t stream_id)67 int nghttp3_idtr_is_open(nghttp3_idtr *idtr, int64_t stream_id) {
68 uint64_t q;
69
70 assert((idtr->server && (stream_id % 2)) ||
71 (!idtr->server && (stream_id % 2)) == 0);
72
73 q = id_from_stream_id(stream_id);
74
75 return nghttp3_gaptr_is_pushed(&idtr->gap, q, 1);
76 }
77
nghttp3_idtr_first_gap(nghttp3_idtr *idtr)78 uint64_t nghttp3_idtr_first_gap(nghttp3_idtr *idtr) {
79 return nghttp3_gaptr_first_gap_offset(&idtr->gap);
80 }
81