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/*
* Copyright (C) Nginx, Inc.
* Copyright (C) Valentin V. Bartenev
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
static u_char *ngx_http_v2_write_int(u_char *pos, ngx_uint_t prefix,
ngx_uint_t value);
u_char *
ngx_http_v2_string_encode(u_char *dst, u_char *src, size_t len, u_char *tmp,
ngx_uint_t lower)
{
size_t hlen;
hlen = ngx_http_v2_huff_encode(src, len, tmp, lower);
if (hlen > 0) {
*dst = NGX_HTTP_V2_ENCODE_HUFF;
dst = ngx_http_v2_write_int(dst, ngx_http_v2_prefix(7), hlen);
return ngx_cpymem(dst, tmp, hlen);
}
*dst = NGX_HTTP_V2_ENCODE_RAW;
dst = ngx_http_v2_write_int(dst, ngx_http_v2_prefix(7), len);
if (lower) {
ngx_strlow(dst, src, len);
return dst + len;
}
return ngx_cpymem(dst, src, len);
}
static u_char *
ngx_http_v2_write_int(u_char *pos, ngx_uint_t prefix, ngx_uint_t value)
{
if (value < prefix) {
*pos++ |= value;
return pos;
}
*pos++ |= prefix;
value -= prefix;
while (value >= 128) {
*pos++ = value % 128 + 128;
value /= 128;
}
*pos++ = (u_char) value;
return pos;
}
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