(Node.js) Compress Text Feed to Binary

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

Note: This example requires Chilkat v11.0.0 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() {

    var success = false;

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

    var bdCompressed = new chilkat.BinData();

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

    var sbUncompressedChunk = new chilkat.StringBuilder();

    compress.FirstChunk = true;
    compress.LastChunk = false;

    var i;
    for (i = 0; i <= 24; i++) {
        if (i == 24) {
            compress.LastChunk = true;
        }

        sbUncompressedChunk.Clear();
        sbUncompressedChunk.AppendInt(i);
        sbUncompressedChunk.Append(": This is a line of data to be compressed...\r\n");

        compress.CompressSb(sbUncompressedChunk,bdCompressed);

        compress.FirstChunk = false;
    }

    // Show the compressed data in hex format:
    console.log("The hex encoded compressed text:");
    console.log(bdCompressed.GetEncoded("hex"));

    // Now decompress in one call.  It is important to set both FirstChunk and LastChunk = true
    var bdDecompressed = new chilkat.BinData();
    compress.FirstChunk = true;
    compress.LastChunk = true;
    success = compress.DecompressBd2(bdCompressed,bdDecompressed);
    if (success == false) {
        console.log(compress.LastErrorText);
        return;
    }

    var originalText = bdDecompressed.GetString("utf-8");
    console.log(originalText);

}

chilkatExample();