58 lines
2.2 KiB
C
58 lines
2.2 KiB
C
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/*
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* nghttp2 - HTTP/2 C Library
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*
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* Copyright (c) 2012 Tatsuhiro Tsujikawa
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include "nghttp2_npn.h"
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#include <string.h>
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static int select_next_protocol(unsigned char **out, unsigned char *outlen,
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const unsigned char *in, unsigned int inlen,
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const char *key, unsigned int keylen) {
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unsigned int i;
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for (i = 0; i + keylen <= inlen; i += (unsigned int)(in [i] + 1)) {
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if (memcmp(&in[i], key, keylen) == 0) {
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*out = (unsigned char *)&in[i + 1];
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*outlen = in[i];
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return 0;
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}
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}
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return -1;
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}
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#define NGHTTP2_HTTP_1_1_ALPN "\x8http/1.1"
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#define NGHTTP2_HTTP_1_1_ALPN_LEN (sizeof(NGHTTP2_HTTP_1_1_ALPN) - 1)
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int nghttp2_select_next_protocol(unsigned char **out, unsigned char *outlen,
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const unsigned char *in, unsigned int inlen) {
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if (select_next_protocol(out, outlen, in, inlen, NGHTTP2_PROTO_ALPN,
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NGHTTP2_PROTO_ALPN_LEN) == 0) {
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return 1;
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}
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if (select_next_protocol(out, outlen, in, inlen, NGHTTP2_HTTP_1_1_ALPN,
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NGHTTP2_HTTP_1_1_ALPN_LEN) == 0) {
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return 0;
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}
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return -1;
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}
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