NUMCO - NUMber COmpressor

A small compression/decompression library for numerical arrays. Its best suited for large data sets of integers.

How it works

Internally this lib creates a delta encoded array and then deflates it using zlib.

Delta encoding is one of the most powerfull numeric compression methods out there. Its a simple algorithm that converts values in given array so that each represents a difference from the previous value.

Delta encoding example:

[100, 101, 102, 103, 104, 105] converts to [100, 1, 1, 1, 1, 1]

Charts

(the more sequential data the better compression ratio)

Mini DOC

Compression

numco.compress(array) : string
    expects array of numbers as argument and returns compressed base64 encoded string

Decompression

numco.decompress(string) : array
    expects compressed base64 encoded string and returns decompressed array of numbers

Installation

npm install numco --save

Example usage

var numco = require("numco"),
    compress = numco.compress,
    decompress = numco.decompress;

var numArray = [100,101,102,...];

var compressed = compress(numArray);
var decompressed = decompress(compressed);

console.log("compressed base64 encoded string", compressed);
console.log("decompressed array", decompressed);

See tests/index.js for more.

Running tests

npm test

Release History

• 1.0.0 Initial release