Method parse

external/httplib.h:4790–4925

  bool is_valid() const { return is_valid_; }

  bool parse(const char *buf, size_t n, const ContentReceiver &content_callback,
             const MultipartContentHeader &header_callback) {

    buf_append(buf, n);

    while (buf_size() > 0) {
      switch (state_) {
      case 0: { // Initial boundary
        buf_erase(buf_find(dash_boundary_crlf_));
        if (dash_boundary_crlf_.size() > buf_size()) { return true; }
        if (!buf_start_with(dash_boundary_crlf_)) { return false; }
        buf_erase(dash_boundary_crlf_.size());
        state_ = 1;
        break;
      }
      case 1: { // New entry
        clear_file_info();
        state_ = 2;
        break;
      }
      case 2: { // Headers
        auto pos = buf_find(crlf_);
        if (pos > CPPHTTPLIB_HEADER_MAX_LENGTH) { return false; }
        while (pos < buf_size()) {
          // Empty line
          if (pos == 0) {
            if (!header_callback(file_)) {
              is_valid_ = false;
              return false;
            }
            buf_erase(crlf_.size());
            state_ = 3;
            break;
          }

          const auto header = buf_head(pos);

          if (!parse_header(header.data(), header.data() + header.size(),
                            [&](const std::string &, const std::string &) {})) {
            is_valid_ = false;
            return false;
          }

          static const std::string header_content_type = "Content-Type:";

          if (start_with_case_ignore(header, header_content_type)) {
            file_.content_type =
                trim_copy(header.substr(header_content_type.size()));
          } else {
            static const std::regex re_content_disposition(
                R"~(^Content-Disposition:\s*form-data;\s*(.*)$)~",
                std::regex_constants::icase);

            std::smatch m;
            if (std::regex_match(header, m, re_content_disposition)) {
              Params params;
              parse_disposition_params(m[1], params);