1 /*
2 * Copyright (c) 2019 Fastly
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a copy
5 * of this software and associated documentation files (the "Software"), to
6 * deal in the Software without restriction, including without limitation the
7 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
8 * sell copies of the Software, and to permit persons to whom the Software is
9 * furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
19 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
20 * IN THE SOFTWARE.
21 */
22
23 #include <ctype.h>
24 #include "h2o.h"
25 #include "h2o/absprio.h"
26
27 h2o_absprio_t h2o_absprio_default = {H2O_ABSPRIO_DEFAULT_URGENCY, 0};
28
h2o_absprio_parse_priority(const char * s,size_t len,h2o_absprio_t * prio)29 void h2o_absprio_parse_priority(const char *s, size_t len, h2o_absprio_t *prio)
30 {
31 h2o_iovec_t iter = h2o_iovec_init(s, len), value;
32 const char *token;
33 size_t token_len;
34
35 while ((token = h2o_next_token(&iter, ',', ',', &token_len, &value)) != NULL) {
36 if (token_len != 1) {
37 /* Currently only "u=" and "i=" are supported. Thus token_len should always be 1.
38 * Ignore unknown keys. */
39 continue;
40 }
41
42 if (token[0] == 'u') {
43 H2O_BUILD_ASSERT(H2O_ABSPRIO_NUM_URGENCY_LEVELS < 10);
44 if (value.base != NULL && value.len == 1 && '0' <= value.base[0] &&
45 value.base[0] <= '0' + H2O_ABSPRIO_NUM_URGENCY_LEVELS - 1)
46 prio->urgency = value.base[0] - '0';
47 } else if (token[0] == 'i') {
48 if (value.base != NULL) {
49 if (value.len == 2 && value.base[0] == '?') {
50 /* value should contain '?0' or '?1' */
51 if (value.base[1] == '0')
52 prio->incremental = 0;
53 else if (value.base[1] == '1')
54 prio->incremental = 1;
55
56 /* All other cases mean invalid format. Just ignore. */
57 }
58 } else {
59 /* value omitted, meaning that i is true */
60 prio->incremental = 1;
61 }
62 }
63 }
64 }
65