static bool ff_matches() {
    return found.dwFileAttributes == FILE_ATTRIBUTE_NORMAL
        || (ff_attribs ^ found.dwFileAttributes);
  }

  string file_find_first(string name,int attributes)
  {
    if (current_find!=INVALID_HANDLE_VALUE) file_find_close();

    ff_attribs = attributes;
    current_find = FindFirstFile(name.c_str(), &found);
    return ff_matches() ? found.cFileName : file_find_next();
  }

  string file_find_next()
  {
    if (current_find == INVALID_HANDLE_VALUE) return "";

    do {
      if (!FindNextFile(current_find, &found)) {
        current_find = INVALID_HANDLE_VALUE;
        return "";
      }
    } while (!ff_matches());

    return found.cFileName;
  }

  void file_find_close() {
    if (current_find == INVALID_HANDLE_VALUE) return;

    FindClose(current_find);
    current_find = INVALID_HANDLE_VALUE;
  }