nghttp2/lib/nghttp2_npn.c

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/*
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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.
*/
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#include "nghttp2_npn.h"
#include <string.h>
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int nghttp2_select_next_protocol(unsigned char **out, unsigned char *outlen,
const unsigned char *in, unsigned int inlen)
{
int http_selected = 0;
unsigned int i = 0;
for(; i < inlen; i += in[i]+1) {
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if(in[i] == NGHTTP2_PROTO_VERSION_ID_LEN &&
i + 1 + in[i] <= inlen &&
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memcmp(&in[i+1], NGHTTP2_PROTO_VERSION_ID, in[i]) == 0) {
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*out = (unsigned char*)&in[i+1];
*outlen = in[i];
return 1;
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}
if(in[i] == 8 && i + 1 + in[i] <= inlen &&
memcmp(&in[i+1], "http/1.1", in[i]) == 0) {
http_selected = 1;
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*out = (unsigned char*)&in[i+1];
*outlen = in[i];
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/* Go through to the next iteration, because "HTTP/2" may be
there */
}
}
if(http_selected) {
return 0;
} else {
return -1;
}
}