Ocamlnet 3 Reference Manual : Netencoding.Base64

`sig
val encode :
?pos:int -> ?len:int -> ?linelength:int -> ?crlf:bool -> string -> string
val url_encode :
?pos:int -> ?len:int -> ?linelength:int -> ?crlf:bool -> string -> string
val decode :
?pos:int ->
?len:int -> ?url_variant:bool -> ?accept_spaces:bool -> string -> string
class encoding_pipe :
?linelength:int -> ?crlf:bool -> unit -> Netchannels.pipe
class decoding_pipe :
?url_variant:bool -> ?accept_spaces:bool -> unit -> Netchannels.pipe
end`