package irmin-pack

  1. Overview
  2. Docs
package irmin-pack
Legend:
Library
Module
Module type
Parameter
Class
Class type
module Fm = Fm
module Mapping_file : Mapping_file.S with module Io = Fm.Io
type t
type accessor

An accessor designates a valid readable area in one of the pack files.

Accessors are meant to be used from within the Irmin_pack_unix implementation. Their validity is only checked at creation time, so they are not meant to be kept for a long time. (e.g. if kept over a GC finalisation, an accessor could no longer point to a valid area because the GC changes the domain of valid readable areas)

val v : root:string -> Fm.t -> (t, [> Fm.Errs.t ]) result
val create_accessor_exn : t -> off:Optint.Int63.t -> len:int -> accessor

create_accessor_exn returns an accessor if off and len designate a readable area of the pack files, otherwise it raises one of Errors.Pack_error `Read_out_of_bounds, Errors.Pack_error (`Invalid_prefix_read _) and Errors.Pack_error (`Invalid_read_of_gced_object _).

val create_accessor_from_range_exn : t -> off:Optint.Int63.t -> min_len:int -> max_len:int -> accessor

create_accessor_from_maxlen_exn is similar to create_accessor_exn except that the precise length of the span will be decided during the call.

val shrink_accessor_exn : accessor -> new_len:int -> accessor

shrink_accessor_exn a ~new_len is a where the length is smaller than in a.

val read_exn : t -> accessor -> bytes -> unit

read_exn either reads in the prefix or the suffix file, depending on accessor.

val end_offset : t -> Optint.Int63.t

end_offset is the end offsets of the pack entries, counting that the prefix doesn't start at 0. It counts the entries not yet flushed from the prefix.

val offset_of_suffix_off : t -> Optint.Int63.t -> Optint.Int63.t

offset_of_suffix_off t suffix_off converts a suffix offset into a (global) offset.

val read_in_prefix_and_suffix_exn : t -> off:Optint.Int63.t -> len:int -> bytes -> unit

Simlar to read_exn but if off + len is greater than the end of the prefix, it will read the remaining in the prefix.

OCaml

Innovation. Community. Security.

GitHub Discord Twitter Peertube RSS
About
Changelog Releases Industrial Users Academic Users Why OCaml
Ecosystem
Packages Community Events OCaml Planet Jobs
Resources
Install OCaml Get Started Platform Tools Language Manual Standard Library API Books Exercises Papers OCaml Playground Logo
Policies
Carbon Footprint Governance Privacy Code of Conduct