Function parse_range_header

external/httplib.h:4728–5572

#ifdef CPPHTTPLIB_NO_EXCEPTIONS
inline bool parse_range_header(const std::string &s, Ranges &ranges) {
#else
inline bool parse_range_header(const std::string &s, Ranges &ranges) try {
#endif
  auto is_valid = [](const std::string &str) {
    return std::all_of(str.cbegin(), str.cend(),
                       [](unsigned char c) { return std::isdigit(c); });
  };

  if (s.size() > 7 && s.compare(0, 6, "bytes=") == 0) {
    const auto pos = static_cast<size_t>(6);
    const auto len = static_cast<size_t>(s.size() - 6);
    auto all_valid_ranges = true;
    split(&s[pos], &s[pos + len], ',', [&](const char *b, const char *e) {
      if (!all_valid_ranges) { return; }

      const auto it = std::find(b, e, '-');
      if (it == e) {
        all_valid_ranges = false;
        return;
      }

      const auto lhs = std::string(b, it);
      const auto rhs = std::string(it + 1, e);
      if (!is_valid(lhs) || !is_valid(rhs)) {
        all_valid_ranges = false;
        return;
      }

      const auto first =
          static_cast<ssize_t>(lhs.empty() ? -1 : std::stoll(lhs));
      const auto last =
          static_cast<ssize_t>(rhs.empty() ? -1 : std::stoll(rhs));
      if ((first == -1 && last == -1) ||
          (first != -1 && last != -1 && first > last)) {
        all_valid_ranges = false;
        return;
      }

      ranges.emplace_back(first, last);
    });
    return all_valid_ranges && !ranges.empty();
  }
  return false;
#ifdef CPPHTTPLIB_NO_EXCEPTIONS
}
#else
} catch (...) { return false; }
#endif

class MultipartFormDataParser {
public:
  MultipartFormDataParser() = default;

  void set_boundary(std::string &&boundary) {
    boundary_ = boundary;
    dash_boundary_crlf_ = dash_ + boundary_ + crlf_;
    crlf_dash_boundary_ = crlf_ + dash_ + boundary_;