I am developing a web page containing Javascript. This js uses static string data (about 1-2 MB) which is stored in a flat file. I could compress it with gzip or any other algorithm to reduce the transfer load.
Would it be possible to fetch this binary file with Ajax and decompress it into a string (which I could split later) in the client browser. If yes, how can I achieve this? Does anyone have a code example?
And another library or site is this one, although it has few examples it has some thorough test cases that can be seen.
https://github.com/imaya/zlib.js
Here are some of the complex test cases https://github.com/imaya/zlib.js/blob/master/test/browser-test.js https://github.com/imaya/zlib.js/blob/master/test/browser-plain-test.js
The code example seems very compact. Just these two lines of code...
// compressed = Array.<number> or Uint8Array
var gunzip = new Zlib.Gunzip(compressed);
var plain = gunzip.decompress();
If you look here https://github.com/imaya/zlib.js/blob/master/bin/gunzip.min.js you see they have the packed js file you will need to include. You might need to include one or two of the others in https://github.com/imaya/zlib.js/blob/master/bin.
In any event get those files into your page and then feed the GUnzip objects your pre-gzipped data from the server and then it will be as expected.
You will need to download the data and get it into an array yourself using other functions. I do not think they include that support.
So try these examples of download from https://developer.mozilla.org/en-US/docs/DOM/XMLHttpRequest/Sending_and_Receiving_Binary_Data
function load_binary_resource(url) {
var req = new XMLHttpRequest();
req.open('GET', url, false);
req.overrideMimeType('text\/plain; charset=x-user-defined');
req.send(null);
if (req.status != 200) return '';
return req.responseText;
}
// Each byte is now encoded in a 2 byte string character. Just AND it with 0xFF to get the actual byte and then feed that to GUnzip...
var filestream = load_binary_resource(url);
var abyte = filestream.charCodeAt(x) & 0xff; // throw away high-order byte (f7)
===================================== Also there is Node.js
Question is similar to Simplest way to download and unzip files in Node.js cross-platform?
There is this example code at nodejs documentation. I do not know how much more specific it gets than that... http://nodejs.org/api/zlib.html