[AS1] LZW compression

programming flash
1

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.