Gzip.KSize
val ctor : ('a, 'b) k -> ('a, 'b) state
val get_byte : (int -> (Safe.ro, 'a) Safe.t -> (Safe.wo, 'b) Safe.t -> ('a, 'b) t -> ('a, 'b) res) -> (Safe.ro, 'a) Safe.t -> (Safe.wo, 'b) Safe.t -> ('a, 'b) t -> ('a, 'b) res