1/*
2 * nghttp2 - HTTP/2 C Library
3 *
4 * Copyright (c) 2022 nghttp3 contributors
5 * Copyright (c) 2022 nghttp2 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#ifndef NGHTTP2_EXTPRI_H
27#define NGHTTP2_EXTPRI_H
28
29#ifdef HAVE_CONFIG_H
30#  include <config.h>
31#endif /* HAVE_CONFIG_H */
32
33#include <nghttp2/nghttp2.h>
34
35/*
36 * NGHTTP2_EXTPRI_INC_MASK is a bit mask to retrieve incremental bit
37 * from a value produced by nghttp2_extpri_to_uint8.
38 */
39#define NGHTTP2_EXTPRI_INC_MASK (1 << 7)
40
41/*
42 * nghttp2_extpri_to_uint8 encodes |pri| into uint8_t variable.
43 */
44uint8_t nghttp2_extpri_to_uint8(const nghttp2_extpri *extpri);
45
46/*
47 * nghttp2_extpri_from_uint8 decodes |u8extpri|, which is produced by
48 * nghttp2_extpri_to_uint8, intto |extpri|.
49 */
50void nghttp2_extpri_from_uint8(nghttp2_extpri *extpri, uint8_t u8extpri);
51
52/*
53 * nghttp2_extpri_uint8_urgency extracts urgency from |PRI| which is
54 * supposed to be constructed by nghttp2_extpri_to_uint8.
55 */
56#define nghttp2_extpri_uint8_urgency(PRI)                                      \
57  ((uint32_t)((PRI) & ~NGHTTP2_EXTPRI_INC_MASK))
58
59/*
60 * nghttp2_extpri_uint8_inc extracts inc from |PRI| which is supposed to
61 * be constructed by nghttp2_extpri_to_uint8.
62 */
63#define nghttp2_extpri_uint8_inc(PRI) (((PRI)&NGHTTP2_EXTPRI_INC_MASK) != 0)
64
65#endif /* NGHTTP2_EXTPRI_H */
66