1
2 /*
3 * Copyright (C) Nginx, Inc.
4 * Copyright (C) Valentin V. Bartenev
5 */
6
7
8 #include <ngx_config.h>
9 #include <ngx_core.h>
10 #include <ngx_http.h>
11
12
13 static u_char *ngx_http_v2_write_int(u_char *pos, ngx_uint_t prefix,
14 ngx_uint_t value);
15
16
17 u_char *
ngx_http_v2_string_encode(u_char * dst,u_char * src,size_t len,u_char * tmp,ngx_uint_t lower)18 ngx_http_v2_string_encode(u_char *dst, u_char *src, size_t len, u_char *tmp,
19 ngx_uint_t lower)
20 {
21 size_t hlen;
22
23 hlen = ngx_http_v2_huff_encode(src, len, tmp, lower);
24
25 if (hlen > 0) {
26 *dst = NGX_HTTP_V2_ENCODE_HUFF;
27 dst = ngx_http_v2_write_int(dst, ngx_http_v2_prefix(7), hlen);
28 return ngx_cpymem(dst, tmp, hlen);
29 }
30
31 *dst = NGX_HTTP_V2_ENCODE_RAW;
32 dst = ngx_http_v2_write_int(dst, ngx_http_v2_prefix(7), len);
33
34 if (lower) {
35 ngx_strlow(dst, src, len);
36 return dst + len;
37 }
38
39 return ngx_cpymem(dst, src, len);
40 }
41
42
43 static u_char *
ngx_http_v2_write_int(u_char * pos,ngx_uint_t prefix,ngx_uint_t value)44 ngx_http_v2_write_int(u_char *pos, ngx_uint_t prefix, ngx_uint_t value)
45 {
46 if (value < prefix) {
47 *pos++ |= value;
48 return pos;
49 }
50
51 *pos++ |= prefix;
52 value -= prefix;
53
54 while (value >= 128) {
55 *pos++ = value % 128 + 128;
56 value /= 128;
57 }
58
59 *pos++ = (u_char) value;
60
61 return pos;
62 }
63