class type out_record_channel =
  object
    method close_out : unit -> unit
    method flush : unit -> unit
    method output : string -> int -> int -> int
    method output_buffer : Buffer.t -> unit
    method output_byte : int -> unit
    method output_channel : ?len:int -> Netchannels.in_obj_channel -> unit
    method output_char : char -> unit
    method output_eor : unit -> unit
    method output_string : string -> unit
    method pos_out : int
    method really_output : string -> int -> int -> unit
  end
class type in_record_channel =
  object
    method close_in : unit -> unit
    method input : string -> int -> int -> int
    method input_byte : unit -> int
    method input_char : unit -> char
    method input_eor : unit -> unit
    method input_line : unit -> string
    method pos_in : int
    method really_input : string -> int -> int -> unit
  end
type local_receiver =
    [ `File_structure of Netchannels.out_obj_channel
    | `Record_structure of out_record_channel ]
type local_sender =
    [ `File_structure of Netchannels.in_obj_channel
    | `Record_structure of in_record_channel ]
type transmission_mode = [ `Block_mode | `Stream_mode ]
type descr_state = [ `Clean | `Down | `Transfer_in_progress ]
type text_data_repr =
    [ `ASCII of Netconversion.encoding
    | `ASCII_unix of Netconversion.encoding
    | `EBCDIC of Netconversion.encoding ]
class write_out_record_channel :
  repr:text_data_repr -> Netchannels.out_obj_channel -> out_record_channel
class read_in_record_channel :
  repr:text_data_repr -> Netchannels.in_obj_channel -> in_record_channel
class data_converter :
  fromrepr:text_data_repr ->
  torepr:text_data_repr -> Netchannels.io_obj_channel
class type ftp_data_engine =
  object
    method abort : unit -> unit
    method descr : Unix.file_descr
    method descr_state : descr_state
    method event_system : Unixqueue.event_system
    method request_notification : (unit -> bool) -> unit
    method state : unit Uq_engines.engine_state
  end
class ftp_data_receiver :
  esys:Unixqueue.event_system ->
  mode:transmission_mode ->
  local_receiver:local_receiver ->
  descr:Unix.file_descr ->
  unit ->
  object
    method abort : unit -> unit
    method descr : Unix.file_descr
    method descr_state : descr_state
    method event_system : Unixqueue.event_system
    method local_receiver : local_receiver
    method request_notification : (unit -> bool) -> unit
    method state : unit Uq_engines.engine_state
  end
class ftp_data_sender :
  esys:Unixqueue.event_system ->
  mode:transmission_mode ->
  local_sender:local_sender ->
  descr:Unix.file_descr ->
  unit ->
  object
    method abort : unit -> unit
    method descr : Unix.file_descr
    method descr_state : descr_state
    method event_system : Unixqueue.event_system
    method local_sender : local_sender
    method request_notification : (unit -> bool) -> unit
    method state : unit Uq_engines.engine_state
  end