| /* |
| * 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_npn.h" |
| |
| #include <string.h> |
| |
| static int select_next_protocol(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_next_protocol(out, outlen, in, inlen, NGHTTP2_PROTO_ALPN, |
| NGHTTP2_PROTO_ALPN_LEN) == 0) { |
| return 1; |
| } |
| if (select_next_protocol(out, outlen, in, inlen, NGHTTP2_HTTP_1_1_ALPN, |
| NGHTTP2_HTTP_1_1_ALPN_LEN) == 0) { |
| return 0; |
| } |
| return -1; |
| } |