Hi,
I am trying to use a javascript function in Actionscript 1. It is used to compress/decompress the string using LZW algorithm. The compression part works fine but decompression is not working.
// LZW-compress 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*;
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* = String.fromCharCode(out*);
}
return out.join("");
}
// Decompress an LZW-encoded string
function lzw_decode(s) {
var dict = {};
var data = (s + "").split("");
var currChar = data[0];
var oldPhrase = currChar;
var out = [currChar];
var code = 256;
var phrase;
for (var i=1; i<data.length; i++) {
var currCode = data*.charCodeAt(0);
if (currCode < 256) {
phrase = data*;
}
else {
phrase = dict[currCode] ? dict[currCode] : (oldPhrase + currChar);
}
out.push(phrase);
currChar = phrase.charAt(0);
dict
= oldPhrase + currChar;
code++;
oldPhrase = phrase;
}
return out.join("");
}
var compressed = lzw_encode(“Nitin Mukesh Nitin Mukesh Nitin Mukesh Nitin Mukesh Nitin Mukesh Nitin Mukesh Nitin Mukesh Nitin Mukesh Nitin Mukesh Nitin Mukesh”);
trace(compressed);
trace(lzw_decode(compressed));
Output
Compressed : Nitin Mukesh ĀĂĄĆĈĊČāăąćĉċčĕĐĘēĎĖđęĔďėĒĚĤġĞěĥĢğĜĦģĠĘ
Decompressed : Nitin Mukesh
Could not figure out what is the problem.