package core_kernel

  1. Overview
  2. Docs
package core_kernel
Legend:
Library
Module
Module type
Parameter
Class
Class type

A buffer for incremental decoding of an input stream.

An Unpack_buffer.t is a buffer to which one can feed strings, and then unpack from the buffer to produce a queue of values.

module Unpack_one : sig ... end

If unpack_one : ('a, 'state) unpack, then unpack_one ~state ~buf ~pos ~len must unpack at most one value of type 'a from buf starting at pos, and not using more than len characters. unpack_one must return one the following:

type 'a t
val sexp_of_t : ('a -> Sexplib0.Sexp.t) -> 'a t -> Sexplib0.Sexp.t
include Core.Invariant.S1 with type 'a t := 'a t
val invariant : ('a -> unit) -> 'a t -> unit
val create : 'a Unpack_one.t -> 'a t
val create_bin_prot : 'a Core.Bin_prot.Type_class.reader -> 'a t

create_bin_prot reader returns an unpack buffer that unpacks the "size-prefixed" bin_prot encoding, in which a value is encoded by first writing the length of the bin_prot data as a 64-bit int, and then writing the bin_prot data itself.

val is_empty : _ t -> bool Core.Or_error.t

is_empty returns true if all the data fed into t has been unpacked into values; false if t has unconsumed bytes or partially unpacked data. is_empty returns an error if t has encountered an unpacking error.

val feed : ?pos:int -> ?len:int -> _ t -> Core.Bigstring.t -> unit Core.Or_error.t

feed t buf ?pos ?len adds the specified substring of buf to t's buffer. It returns an error if t has encountered an unpacking error.

val feed_string : ?pos:int -> ?len:int -> _ t -> string -> unit Core.Or_error.t
val feed_bytes : ?pos:int -> ?len:int -> _ t -> Core.Bytes.t -> unit Core.Or_error.t
val unpack_into : 'a t -> 'a Core.Queue.t -> unit Core.Or_error.t

unpack_into t q unpacks all the values that it can from t and enqueues them in q. If there is an unpacking error, unpack_into returns an error, and subsequent feed and unpack operations on t will return that same error -- i.e. no more data can be fed to or unpacked from t.

val unpack_iter : 'a t -> f:('a -> unit) -> unit Core.Or_error.t

unpack_iter t ~f unpacks all the values that it can from t, calling f on each value as it's unpacked. If there is an unpacking error (including if f raises), unpack_iter returns an error, and subsequent feed and unpack operations on t will return that same error -- i.e., no more data can be fed to or unpacked from t.

Behavior is unspecified if f operates on t.

val debug : bool ref

debug controls whether invariants are checked at each call. Setting this to true can make things very slow.

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