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-rw-r--r--lib/nghttp2_npn.c57
1 files changed, 57 insertions, 0 deletions
diff --git a/lib/nghttp2_npn.c b/lib/nghttp2_npn.c
new file mode 100644
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--- /dev/null
+++ b/lib/nghttp2_npn.c
@@ -0,0 +1,57 @@
+/*
+ * 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;
+}