npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

rle

v1.0.2

Published

RLE - run length encoding, the simplest approach for lossless compression

Downloads

335

Readme

##RLE - Run Length Encoding the simplest approach for lossless compression

###Install

npm install rle

###API

Uint32Array RLE.encode(Array<*> stream)
Encodes the given stream of binary data by run length. Each "truthy" element in the stream is treated as 1.
The maximum run length is "limited" to 2^28.
This function further packs the data to reduce the memory usage by nominal 1/4 of the simple RLE approach.

Array<boolean> RLE.decode(Uint32Array stream)
Decodes the stream of RLE data to a binary stream.

Array<number> RLE.encodeSimple(Array<*> stream)
Encodes the given data by run length using the simple approach. Each "truthy" element in the stream is treated as 1. The return value represents a stream of alternating run lengths starting with the length of 0.

Array<boolean> RLE.decodeSimple(Array<number> stream)
Decodes the stream of simple RLE data to a binary stream.

###Example

var rle = require('rle');
var blackAndWhite = getBlackAndWhiteData();
var encoded = rle.encode(blackAndWhite.asArray());

//....

var decoded = rle.decode(encoded);

####Base64

var rleEncoded = rle.encode(data);
base64Encoded = new Buffer(new Uint8Array(rleEncoded.buffer)).toString('base64');

//....

var base64Decoded = new Uint32Array(new Uint8Array(new Buffer(base64Encoded, 'base64')).buffer);
 var rleDecoded = rle.decode(base64Decoded);