LZ compression for JavaScript compresses and decompresses JavaScript strings.
- Easy to use.
- Fast LZipperLite.js is faster than any LZW JavaScript compression I have tested so far.
First release for ECMAScript6 Added LZipperLite that is compatible with ECMAScript5 Removed older versions now only using LZipperLite
Simply add LZipperLite.js
<script src="LZipperLite.js"></script>
LZipperLite.js adds the global object LZipper
to the global name-space providing four functions
String = LZipper.compress(String);
String = LZipper.decompress(String)
String = LZipper.char2Int(String)
String = LZipper.int2Char(String)
Methods.
LZipper.compress
Arguments
data
a String to be compressed.
returns
a string representing a compressed version of the input string
LZipper.decompress
Arguments
compressed
a compressed string.
returns
an uncompressed string.
LZipper.int2Char
Arguments
String
a javascript 16 bit unicode string
returns
String
8 bit encoded unicode string. Uses only the first 8bits to encode all the unicode characters so that the string can be converted to Base64 via window.btoa
LZipper.int2Char
Arguments
String
a javascript 8 bit encoded 16bit unicode string. See above
returns
String
The 16 bit unicode string
LZipper is handy for storing data in localStorage
Save to local storage.
// myObject represents a javascript object.
localStorage.myData = LZipper.compress ( JSON.stringify (myObject) ); // save compress JSON to local storage
Retrieval.
var myObject;
if (localStorage.myData !== undefined) {
myObject = JSON.parse ( LZipper.decompress ( localStorage.myData ));
}
I have added two functions to allow the compressed string to be converted to Base64 so it can be added to a URL, this is to deal with the URL size limitations that browsers have.
To compress and add to a URL
var data = JSON.stringify(myData);
var href = "https://myweb.com/page.html?data=" + btoa(LZipper.int2Char(LZipper.compress(data)))
To decompress from url
var data = location.href.split("?data=")[0];
var myData = JSON.parse(LZipper.decompress(LZipper.char2Int(atob(data))));
Knowledge of JavaScript