src/Pure/System/isabelle_system.ML

   val with_tmp_file: string -> string -> (Path.T -> 'a) -> 'a
   val rm_tree: Path.T -> unit
   val with_tmp_dir: string -> (Path.T -> 'a) -> 'a
   val download: string -> Bytes.T
   val download_file: string -> Path.T -> unit
-  val decode_base64: Bytes.T -> Bytes.T
-  val encode_base64: Bytes.T -> Bytes.T
-  val compress: Bytes.T -> Bytes.T
-  val uncompress: Bytes.T -> Bytes.T
   val isabelle_id: unit -> string
   val isabelle_identifier: unit -> string option
   val isabelle_heading: unit -> string
   val isabelle_name: unit -> string
   val identification: unit -> string

 val download = Bytes.string #> Scala.function1_bytes "download";
 
 fun download_file url path = Bytes.write path (download url);
 
 
-(* base64 *)
-
-val decode_base64 = Scala.function1_bytes "decode_base64";
-val encode_base64 = Scala.function1_bytes "encode_base64";
-
-
-(* XZ compression *)
-
-val compress = Scala.function1_bytes "compress";
-val uncompress = Scala.function1_bytes "uncompress";
-
-
 (* Isabelle distribution identification *)
 
 fun isabelle_id () = Scala.function1 "isabelle_id" "";
 
 fun isabelle_identifier () = try getenv_strict "ISABELLE_IDENTIFIER";