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/*
* nghttp2 - HTTP/2 C Library
*
* Copyright (c) 2012 Tatsuhiro Tsujikawa
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "nghttp2_alpn.h"
#include <string.h>
static int select_alpn(const unsigned char **out, unsigned char *outlen,
const unsigned char *in, unsigned int inlen,
const char *key, unsigned int keylen) {
unsigned int i;
for (i = 0; i + keylen <= inlen; i += (unsigned int)(in[i] + 1)) {
if (memcmp(&in[i], key, keylen) == 0) {
*out = (unsigned char *)&in[i + 1];
*outlen = in[i];
return 0;
}
}
return -1;
}
#define NGHTTP2_HTTP_1_1_ALPN "\x8http/1.1"
#define NGHTTP2_HTTP_1_1_ALPN_LEN (sizeof(NGHTTP2_HTTP_1_1_ALPN) - 1)
int nghttp2_select_next_protocol(unsigned char **out, unsigned char *outlen,
const unsigned char *in, unsigned int inlen) {
if (select_alpn((const unsigned char **)out, outlen, in, inlen,
NGHTTP2_PROTO_ALPN, NGHTTP2_PROTO_ALPN_LEN) == 0) {
return 1;
}
if (select_alpn((const unsigned char **)out, outlen, in, inlen,
NGHTTP2_HTTP_1_1_ALPN, NGHTTP2_HTTP_1_1_ALPN_LEN) == 0) {
return 0;
}
return -1;
}
int nghttp2_select_alpn(const unsigned char **out, unsigned char *outlen,
const unsigned char *in, unsigned int inlen) {
if (select_alpn(out, outlen, in, inlen, NGHTTP2_PROTO_ALPN,
NGHTTP2_PROTO_ALPN_LEN) == 0) {
return 1;
}
if (select_alpn(out, outlen, in, inlen, NGHTTP2_HTTP_1_1_ALPN,
NGHTTP2_HTTP_1_1_ALPN_LEN) == 0) {
return 0;
}
return -1;
}
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