I am still new to Javascript. I have a situation where many users can send large JSON back to the server. In order to limit traffic, I would like to gzip them. Is this possible in Javascript? How can I can create a byte array from the string representation of the JSON? Thanks.
I know of no gzip implementations, but there are other compression methods at your disposal.
This will lzw-encode a string using JavaScript:
// lzw-encode a string
function lzw_encode(s) {
var dict = {};
var data = (s + "").split("");
var out = [];
var currChar;
var phrase = data[0];
var code = 256;
for (var i=1; i<data.length; i++) {
currChar=data[i];
if (dict[phrase + currChar] != null) {
phrase += currChar;
}
else {
out.push(phrase.length > 1 ? dict[phrase] : phrase.charCodeAt(0));
dict[phrase + currChar] = code;
code++;
phrase=currChar;
}
}
out.push(phrase.length > 1 ? dict[phrase] : phrase.charCodeAt(0));
for (var i=0; i<out.length; i++) {
out[i] = String.fromCharCode(out[i]);
}
return out.join("");
}
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