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/*
* 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 3;
}
*p++ = 0x80 | (value >> 16);
*p++ = (value >> 8);
*p++ = value;
return (uintptr_t) p;
}
if (p == NULL) {
return 4;
}
*p++ = 0xc0 | (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;
for (n = 10; n > 1; n--) {
if (value >> (7 * (n - 1))) {
break;
}
}
if (p == NULL) {
return n + 1;
}
*p++ |= thresh;
for ( /* void */ ; n > 1; n--) {
*p++ = 0x80 | (value >> 7 * (n - 1));
}
*p++ = value & 0x7f;
return (uintptr_t) p;
}
uint64_t
ngx_http_v3_decode_varlen_int(u_char *p)
{
uint64_t value;
ngx_uint_t len;
len = *p >> 6;
value = *p & 0x3f;
while (len--) {
value = (value << 8) + *p++;
}
return value;
}
int64_t
ngx_http_v3_decode_prefix_int(u_char **src, size_t len, ngx_uint_t prefix)
{
u_char *p;
int64_t value, thresh;
if (len == 0) {
return NGX_ERROR;
}
p = *src;
thresh = (1 << prefix) - 1;
value = *p++ & thresh;
if (value != thresh) {
*src = p;
return value;
}
value = 0;
/* XXX handle overflows */
while (--len) {
value = (value << 7) + (*p & 0x7f);
if ((*p++ & 0x80) == 0) {
*src = p;
return value + thresh;
}
}
return NGX_ERROR;
}
ngx_int_t
ngx_http_v3_decode_huffman(ngx_connection_t *c, ngx_str_t *s)
{
u_char state, *p, *data;
state = 0;
p = ngx_pnalloc(c->pool, s->len * 8 / 5);
if (p == NULL) {
return NGX_ERROR;
}
data = p;
if (ngx_http_v2_huff_decode(&state, s->data, s->len, &p, 1, c->log)
!= NGX_OK)
{
return NGX_ERROR;
}
s->len = p - data;
s->data = data;
return NGX_OK;
}
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