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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 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;
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;
}
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