(** * Encoding and decoding values *)

Definition inj_bytes (bl: list byte) : list memval :=
  List.map Byte bl.Fixpoint proj_bytes (vl: list memval) : option (list byte) :=
  match vl with
  | nil => Some nil
  | Byte b :: vl' =>
      match proj_bytes vl' with None => None | Some bl => Some(b :: bl) end
  | _ => None
  end.Remark length_inj_bytes:
  forall bl, length (inj_bytes bl) = length bl.Remark proj_inj_bytes:
  forall bl, proj_bytes (inj_bytes bl) = Some bl.

Lemma inj_proj_bytes: forall cl bl, proj_bytes cl = Some bl -> cl = inj_bytes bl.