Function parse_url_char

src/brpc/details/http_parser.cpp:550–688

Our URL parser. * * This is designed to be shared by http_parser_execute() for URL validation, * hence it has a state transition + byte-for-byte interface. In addition, it * is meant to be embedded in http_parser_parse_url(), which does the dirty * work of turning state transitions URL components for its API. * * This function should only be invoked with non-space characters. It is * assum

 * URL and non-URL states by looking for these.
 */
static enum state
parse_url_char(enum state s, const char ch)
{
  if (ch == ' ' || ch == '\r' || ch == '\n') {
    return s_dead;
  }

#if BRPC_HTTP_PARSER_STRICT
  if (ch == '\t' || ch == '\f') {
    return s_dead;
  }
#endif

  switch (s) {
    case s_req_spaces_before_url:
      /* Proxied requests are followed by scheme of an absolute URI (alpha).
       * All methods except CONNECT are followed by '/' or '*'.
       */

      if (ch == '/' || ch == '*') {
        return s_req_path;
      }

      if (IS_ALPHA(ch)) {
        return s_req_scheme;
      }

      break;

    case s_req_scheme:
      if (IS_ALPHA(ch)) {
        return s;
      }

      if (ch == ':') {
        return s_req_scheme_slash;
      }

      break;

    case s_req_scheme_slash:
      if (ch == '/') {
        return s_req_scheme_slash_slash;
      }

      break;

    case s_req_scheme_slash_slash:
      if (ch == '/') {
        return s_req_server_start;
      }

      break;

    case s_req_server_with_at:
      if (ch == '@') {
        return s_dead;
      }