func (h *headerV7) uid() []byte      { return h[108:][:8] }
func (h *headerV7) gid() []byte      { return h[116:][:8] }
func (h *headerV7) size() []byte     { return h[124:][:12] }
func (h *headerV7) modTime() []byte  { return h[136:][:12] }
func (h *headerV7) chksum() []byte   { return h[148:][:8] }
func (h *headerV7) typeFlag() []byte { return h[156:][:1] }
func (h *headerV7) linkName() []byte { return h[157:][:100] }

type headerGNU [blockSize]byte