rntviewer/src/app_state.h

struct App_State {
  Window_Data win_data;
  User_Input user_input;
  RNTuple_Info *rntinfo;

  FILE *inspected_file;
  u8   *inspected_fmem;
  u64   inspected_file_size;
	// @Platform: inotify file descriptor
	int inot;

	const char *ntpl_name;
};

internal
size_t file_size(FILE *f)
{
  fseek(f, 0, SEEK_END);
  size_t res = ftell(f);
  fseek(f, 0, SEEK_SET);
  return res;  
}