Simple63 is an OCaml module for compressing and decompressing sequences of integers along the ideas described in the 2010 paper by Anh and Moffat. Like Simple-8b technique described in that paper, Simple63 is a word-bounded, and (as the name suggests) is the result of adapting Simple-8b to work with OCaml's 63-bit integers. While using int64 integer types would have been possible, the additional boxing required to manipulate int64's make this option unappealing.

Example usage:

let in_lst = [1; 22; 333; 4444] in
let in_seq = List.to_seq in_lst in
let out_seq = encode_to_seq in_seq in

(* confirm that we get out what we've put in: *)
let in_seq' = decode_from_seq out_seq in
let in_lst' = List.of_seq in_seq' in
assert (in_lst = in_lst')

To install:

opam install simple63

See https://barko.github.io/simple63

BSD