blob: e796da772aae4ba80ebbe9abf59f520e2c5b0a78 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
|
/*
* Copyright (C) Roman Arutyunyan
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
uintptr_t
ngx_http_v3_encode_varlen_int(u_char *p, uint64_t value)
{
if (value <= 63) {
if (p == NULL) {
return 1;
}
*p++ = value;
return (uintptr_t) p;
}
if (value <= 16383) {
if (p == NULL) {
return 2;
}
*p++ = 0x40 | (value >> 8);
*p++ = value;
return (uintptr_t) p;
}
if (value <= 1073741823) {
if (p == NULL) {
return 4;
}
*p++ = 0x80 | (value >> 24);
*p++ = (value >> 16);
*p++ = (value >> 8);
*p++ = value;
return (uintptr_t) p;
}
if (p == NULL) {
return 8;
}
*p++ = 0xc0 | (value >> 56);
*p++ = (value >> 48);
*p++ = (value >> 40);
*p++ = (value >> 32);
*p++ = (value >> 24);
*p++ = (value >> 16);
*p++ = (value >> 8);
*p++ = value;
return (uintptr_t) p;
}
uintptr_t
ngx_http_v3_encode_prefix_int(u_char *p, uint64_t value, ngx_uint_t prefix)
{
ngx_uint_t thresh, n;
thresh = (1 << prefix) - 1;
if (value < thresh) {
if (p == NULL) {
return 1;
}
*p++ |= value;
return (uintptr_t) p;
}
value -= thresh;
if (p == NULL) {
for (n = 2; value >= 128; n++) {
value >>= 7;
}
return n;
}
*p++ |= thresh;
while (value >= 128) {
*p++ = 0x80 | value;
value >>= 7;
}
*p++ = value;
return (uintptr_t) p;
}
|
