Method FileWriter

Bcore/src/main/cpp/ziparchive/zip_archive.cc:837–842

  }

  FileWriter(FileWriter&& other)
      : fd_(other.fd_),
        declared_length_(other.declared_length_),
        total_bytes_written_(other.total_bytes_written_) {
    other.fd_ = -1;
  }

  bool IsValid() const { return fd_ != -1; }