err := w.WriteHeader(&Header{
		Name: "lorem.txt",
		Mode: 0600,
		Size: int64(len(inp)),
	})

func (h Hasher) Hash(t types.Type) uint32 {
	hash, ok := h.memo[t]
	if !ok {
		hash = h.hashFor(t)
		h.memo[t] = hash
	}
	return hash
}

// hashString computes the Fowler–Noll–Vo hash of s.
func hashString(s string) uint32 {
	var h uint32
	for i := 0; i < len(s); i++ {
		h ^= uint32(s[i])
		h *= 16777619
	}
	return h
}

// hashFor computes the hash of t.