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HTTP/3: implemented QPACK Huffman encoding for response fields.

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This commit is contained in:
Sergey Kandaurov 2021-09-13 16:25:08 +03:00
parent 590996466c
commit 0ac1f6fd47
1 changed files with 82 additions and 5 deletions
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87
src/http/v3/ngx_http_v3_encode.c
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@ -137,6 +137,9 @@ uintptr_t
ngx_http_v3_encode_field_lri(u_char *p, ngx_uint_t dynamic, ngx_uint_t index,
u_char *data, size_t len)
{
size_t hlen;
u_char *p1, *p2;
/* Literal Field Line With Name Reference */
if (p == NULL) {
@ -148,11 +151,28 @@ ngx_http_v3_encode_field_lri(u_char *p, ngx_uint_t dynamic, ngx_uint_t index,
*p = dynamic ? 0x40 : 0x50;
p = (u_char *) ngx_http_v3_encode_prefix_int(p, index, 4);
p1 = p;
*p = 0;
p = (u_char *) ngx_http_v3_encode_prefix_int(p, len, 7);
if (data) {
p = ngx_cpymem(p, data, len);
p2 = p;
hlen = ngx_http_v2_huff_encode(data, len, p, 0);
if (hlen) {
p = p1;
*p = 0x80;
p = (u_char *) ngx_http_v3_encode_prefix_int(p, hlen, 7);
if (p != p2) {
ngx_memmove(p, p2, hlen);
}
p += hlen;
} else {
p = ngx_cpymem(p, data, len);
}
}
return (uintptr_t) p;
@ -162,6 +182,9 @@ ngx_http_v3_encode_field_lri(u_char *p, ngx_uint_t dynamic, ngx_uint_t index,
uintptr_t
ngx_http_v3_encode_field_l(u_char *p, ngx_str_t *name, ngx_str_t *value)
{
size_t hlen;
u_char *p1, *p2;
/* Literal Field Line With Literal Name */
if (p == NULL) {
@ -171,16 +194,50 @@ ngx_http_v3_encode_field_l(u_char *p, ngx_str_t *name, ngx_str_t *value)
+ value->len;
}
p1 = p;
*p = 0x20;
p = (u_char *) ngx_http_v3_encode_prefix_int(p, name->len, 3);
ngx_strlow(p, name->data, name->len);
p += name->len;
p2 = p;
hlen = ngx_http_v2_huff_encode(name->data, name->len, p, 1);
if (hlen) {
p = p1;
*p = 0x28;
p = (u_char *) ngx_http_v3_encode_prefix_int(p, hlen, 3);
if (p != p2) {
ngx_memmove(p, p2, hlen);
}
p += hlen;
} else {
ngx_strlow(p, name->data, name->len);
p += name->len;
}
p1 = p;
*p = 0;
p = (u_char *) ngx_http_v3_encode_prefix_int(p, value->len, 7);
p = ngx_cpymem(p, value->data, value->len);
p2 = p;
hlen = ngx_http_v2_huff_encode(value->data, value->len, p, 0);
if (hlen) {
p = p1;
*p = 0x80;
p = (u_char *) ngx_http_v3_encode_prefix_int(p, hlen, 7);
if (p != p2) {
ngx_memmove(p, p2, hlen);
}
p += hlen;
} else {
p = ngx_cpymem(p, value->data, value->len);
}
return (uintptr_t) p;
}
@ -205,6 +262,9 @@ uintptr_t
ngx_http_v3_encode_field_lpbi(u_char *p, ngx_uint_t index, u_char *data,
size_t len)
{
size_t hlen;
u_char *p1, *p2;
/* Literal Field Line With Post-Base Name Reference */
if (p == NULL) {
@ -216,11 +276,28 @@ ngx_http_v3_encode_field_lpbi(u_char *p, ngx_uint_t index, u_char *data,
*p = 0;
p = (u_char *) ngx_http_v3_encode_prefix_int(p, index, 3);
p1 = p;
*p = 0;
p = (u_char *) ngx_http_v3_encode_prefix_int(p, len, 7);
if (data) {
p = ngx_cpymem(p, data, len);
p2 = p;
hlen = ngx_http_v2_huff_encode(data, len, p, 0);
if (hlen) {
p = p1;
*p = 0x80;
p = (u_char *) ngx_http_v3_encode_prefix_int(p, hlen, 7);
if (p != p2) {
ngx_memmove(p, p2, hlen);
}
p += hlen;
} else {
p = ngx_cpymem(p, data, len);
}
}
return (uintptr_t) p;