tar 2.6.0 · OCaml Package

Process and create tar file headers.

type compatibility =

| OldGNU
(*
GNU tar < 1.12
*)
| GNU
(*
GNU tar 1.12 - 1.13.25
*)
| V7
(*
Origin 7th Release format
*)
| Ustar
(*
POSIX.1-1988
*)
| Posix
(*
POSIX.1-2001
*)

tar format assumptions. Default is V7 (for compatibility with versions of ocaml-tar before this type was introduced).

see https://www.gnu.org/software/tar/manual/html_section/Formats.html

val compatibility_level : compatibility ref

Default compatibility if ?level is omitted. Defaults to V7.

module Link : sig ... end

module Extended : sig ... end

type t = {

file_name : string;
file_mode : int;
user_id : int;
group_id : int;
file_size : int64;
mod_time : int64;
link_indicator : Link.t;
link_name : string;
uname : string;
gname : string;
devmajor : int;
devminor : int;
extended : Extended.t option;

}

Represents a standard archive (note checksum not stored).

Helper function to make a simple header.

val make : 
  ?file_mode:int ->
  ?user_id:int ->
  ?group_id:int ->
  ?mod_time:int64 ->
  ?link_indicator:Link.t ->
  ?link_name:string ->
  ?uname:string ->
  ?gname:string ->
  ?devmajor:int ->
  ?devminor:int ->
  string ->
  int64 ->
  t

make file_name file_size creates a simple header. file_mode defaults to 0o400, user_id, group_id default to 0, mod_time defaults to 0L (epoch), link_indicator defaults to Normal, link_name, uname and gname default to "", and devmajor and devminor default to 0.

val length : int

Length of a header block.

val zero_block : Cstruct.t

A blank header block (two of these in series mark the end of the tar).

val to_detailed_string : t -> string

Pretty-print the header record.

val to_hex : string -> string

For debugging: pretty-print a string as hex.

exception Checksum_mismatch

Thrown when unmarshalling a header if the checksums don't match.

exception End_of_stream

Thrown if we detect the end of the tar (at least two zero blocks in sequence).

val unmarshal : 
  ?level:compatibility ->
  ?extended:Extended.t ->
  Cstruct.t ->
  t option

Unmarshal a header block, returning None if it's all zeroes. This header block may be preceded by an ?extended block which will override some fields.

val marshal : ?level:compatibility -> Cstruct.t -> t -> unit

Marshal a header block, computing and inserting the checksum.

val compute_zero_padding_length : t -> int

Compute the amount of zero-padding required to round up the file size to a whole number of blocks.

val zero_padding : t -> Cstruct.t

Return the required zero-padding as a string.

val to_sectors : t -> int64

to_sectors t is the number of sectors occupied by the data.

package tar