(Node.js) Compress String Feed to Base64

This example receives incoming text data in chunks, compresses as a stream, and accumulates the compressed data in base64.

The purpose is to demonstrate the BeginCompressStringENC, MoreCompressStringENC, and EndCompressStringENC methods.

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

var os = require('os');
if (os.platform() == 'win32') {  
    if (os.arch() == 'ia32') {
        var chilkat = require('@chilkat/ck-node21-win-ia32');
    } else {
        var chilkat = require('@chilkat/ck-node21-win64'); 
    }
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node21-arm');
    } else if (os.arch() == 'x86') {
        var chilkat = require('@chilkat/ck-node21-linux32');
    } else {
        var chilkat = require('@chilkat/ck-node21-linux64');
    }
} else if (os.platform() == 'darwin') {
    if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node21-mac-m1');
    } else {
        var chilkat = require('@chilkat/ck-node21-macosx');
    }
}

function chilkatExample() {

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    var success;
    var sbCompressedBase64 = new chilkat.StringBuilder();

    var compress = new chilkat.Compression();
    compress.Algorithm = "deflate";
    compress.Charset = "utf-8";
    compress.EncodingMode = "base64";

    var sbIndex = new chilkat.StringBuilder();

    var i;
    for (i = 0; i <= 24; i++) {
        // Note: It is possible (and normal) for a BeginCompress* or MoreCompress* method to return
        // an empty string (or 0 bytes).  When this happens, the input data is not lost.  It will be flushed
        // in a subsequent call.
        sbIndex.Clear();
        sbIndex.AppendInt(i);
        if (i == 0) {
            sbCompressedBase64.Append(compress.BeginCompressStringENC(sbIndex.GetAsString()));
        }
        else {
            sbCompressedBase64.Append(compress.MoreCompressStringENC(sbIndex.GetAsString()));
        }

        sbCompressedBase64.Append(compress.MoreCompressStringENC(": This is a line of data to be compressed...\r\n"));
    }

    // Flush any remaining output.
    sbCompressedBase64.Append(compress.EndCompressStringENC());

    console.log("The base64 encoded compressed text:");
    console.log(sbCompressedBase64.GetAsString());

    // Now decompress in one call:
    var originalText = compress.DecompressStringENC(sbCompressedBase64.GetAsString());
    console.log(originalText);

}

chilkatExample();