Mercurial > hg > nginx-quic
annotate src/http/v2/ngx_http_v2_encode.c @ 8509:5b0c229ba5fe quic
QUIC: fixed padding calculation.
Sometimes, QUIC packets need to be of certain (or minimal) size. This is
achieved by adding PADDING frames. It is possible, that adding padding will
affect header size, thus forcing us to recalculate padding size once more.
author | Vladimir Homutov <vl@nginx.com> |
---|---|
date | Mon, 05 Jul 2021 13:17:10 +0300 |
parents | 87e9e4aabf1b |
children | 336084ff943b |
rev | line source |
---|---|
7229
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
1 |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
2 /* |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
3 * Copyright (C) Nginx, Inc. |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
4 * Copyright (C) Valentin V. Bartenev |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
5 */ |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
6 |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
7 |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
8 #include <ngx_config.h> |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
9 #include <ngx_core.h> |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
10 #include <ngx_http.h> |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
11 |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
12 |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
13 static u_char *ngx_http_v2_write_int(u_char *pos, ngx_uint_t prefix, |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
14 ngx_uint_t value); |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
15 |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
16 |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
17 u_char * |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
18 ngx_http_v2_string_encode(u_char *dst, u_char *src, size_t len, u_char *tmp, |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
19 ngx_uint_t lower) |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
20 { |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
21 size_t hlen; |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
22 |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
23 hlen = ngx_http_v2_huff_encode(src, len, tmp, lower); |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
24 |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
25 if (hlen > 0) { |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
26 *dst = NGX_HTTP_V2_ENCODE_HUFF; |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
27 dst = ngx_http_v2_write_int(dst, ngx_http_v2_prefix(7), hlen); |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
28 return ngx_cpymem(dst, tmp, hlen); |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
29 } |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
30 |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
31 *dst = NGX_HTTP_V2_ENCODE_RAW; |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
32 dst = ngx_http_v2_write_int(dst, ngx_http_v2_prefix(7), len); |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
33 |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
34 if (lower) { |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
35 ngx_strlow(dst, src, len); |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
36 return dst + len; |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
37 } |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
38 |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
39 return ngx_cpymem(dst, src, len); |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
40 } |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
41 |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
42 |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
43 static u_char * |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
44 ngx_http_v2_write_int(u_char *pos, ngx_uint_t prefix, ngx_uint_t value) |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
45 { |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
46 if (value < prefix) { |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
47 *pos++ |= value; |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
48 return pos; |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
49 } |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
50 |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
51 *pos++ |= prefix; |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
52 value -= prefix; |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
53 |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
54 while (value >= 128) { |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
55 *pos++ = value % 128 + 128; |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
56 value /= 128; |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
57 } |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
58 |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
59 *pos++ = (u_char) value; |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
60 |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
61 return pos; |
87e9e4aabf1b
HTTP/2: externalized various constants and interfaces.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
62 } |