src: use memchr() in h_general header value

http_parser.c

@@ -1516,16 +1516,29 @@ size_t http_parser_execute (http_parser *parser,
 
           switch (h_state) {
             case h_general:
-              for (; p != data + len; p++) {
-                ch = *p;
-                if (ch == CR || ch == LF) {
-                  --p;
-                  break;
-                }
+            {
+              const char* p_cr;
+              const char* p_lf;
+              size_t limit = data + len - p;
+
+              limit = MIN(limit, HTTP_MAX_HEADER_SIZE);
+
+              p_cr = memchr(p, CR, limit);
+              p_lf = memchr(p, LF, limit);
+              if (p_cr != NULL) {
+                if (p_lf != NULL && p_cr >= p_lf)
+                  p = p_lf;
+                else
+                  p = p_cr;
+              } else if (p_lf != NULL) {
+                p = p_lf;
+              } else {
+                p = data + len;
               }
-              if (p == data + len)
-                --p;
+              --p;
+
               break;
+            }
 
             case h_connection:
             case h_transfer_encoding: