(Node.js) Replacment for Deprecated Crypt2 Compress Functions

The Chilkat Crypt2 compression functions are deprecated and will be removed. This example shows how to duplicate the functionality using the Chilkat Compression class.

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() {

    var crypt = new chilkat.Crypt2();

    // Create data to be compressed.
    var sb = new chilkat.StringBuilder();
    var i = 0;
    while (i < 25) {
        sb.Append("Hello World, this is a test.\r\n");
        i = i+1;
    }

    // Bzip2 compress the utf-8 byte representation of the string and return the compressed data as base64.
    crypt.Charset = "utf-8";
    crypt.EncodingMode = "base64";
    var compressedStr = crypt.CompressStringENC(sb.GetAsString());

    console.log(compressedStr);

    // Result: 4aeUs+4CAABCWmgzMUFZJlNZZ6znBgAAfNeAABJABQBAAIAmZJwAIABwUNNMAAUqoekYjMp4ixF1FlFxF8i5i1FvFwizF9iwi9RdxaizF7RZi6i0ixF3Fui/i7kinChIM9ZzgwA=

    // The result contains an 8-byte header composed of a 4-byte magic number (0xB394A7E1) and a 4-byte length.
    // Do the following to BZip2 decompress using Chilkat Compression
    var bd = new chilkat.BinData();
    bd.AppendEncoded(compressedStr,"base64");

    // Remove the 8-byte header.
    bd.RemoveChunk(0,8);

    // Decompress
    var compress = new chilkat.Compression();
    compress.Algorithm = "bzip2";
    compress.DecompressBd(bd);

    // Get the decompressed string.
    var decompressedStr = bd.GetString("utf-8");
    console.log(decompressedStr);

}

chilkatExample();