(Node.js) Ascii85 Encoding and Decoding

Demonstrates ascii85 encoding and decoding.

Note: Requires Chilkat v9.5.0.79 or greater.

Install Chilkat for Node.js and Electron using npm at Chilkat npm packages for Node.js Chilkat npm packages for Electron on Windows, Linux, MacOS

var os = require('os');
if (os.platform() == 'win32') {  
  var chilkat = require('@chilkat/ck-node23-win64'); 
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node23-linux-arm');
    } else if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node23-linux-arm64');
    } else {
        var chilkat = require('@chilkat/ck-node23-linux-x64');
    }
} else if (os.platform() == 'darwin') {
  var chilkat = require('@chilkat/ck-node23-mac-universal');
}

function chilkatExample() {

    // First demonstrate encoding strings to ascii85 and back.
    var sb = new chilkat.StringBuilder();

    var success = sb.Append("Man is distinguished, not only by his reason, but by this singular passion from other animals, which is a lust of the mind, that by a perseverance of delight in the continued and indefatigable generation of knowledge, exceeds the short vehemence of any carnal pleasure.");

    var encodedAscii85 = sb.GetEncoded("ascii85","utf-8");
    console.log(encodedAscii85);

    // Result is: 9jqo^BlbD-BleB1DJ+*+F(f,q/0JhKF<GL>Cj@.4 ... DII?(E,9)oF*2M7/c

    // Decode back to the original:
    sb.Clear();
    sb.Append(encodedAscii85);
    success = sb.Decode("ascii85","utf-8");
    console.log("Original:");
    console.log(sb.GetAsString());

    // ---- Now encode binary data to ascii85 ----
    var bd = new chilkat.BinData();
    success = bd.LoadFile("qa_data/jpg/starfish20.jpg");
    encodedAscii85 = bd.GetEncoded("ascii85");
    console.log(encodedAscii85);

    // Result is:  s4IA0!"_al8O`[\!<E0k!([(is8E!F7VQ[M+Eqj?FED)3+C]U=6"Fn ...

    // Decode...
    bd.Clear();
    bd.AppendEncoded(encodedAscii85,"ascii85");
    success = bd.WriteFile("qa_output/starfish20.jpg");

}

chilkatExample();