(Java) Compress Text Feed to Binary

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

The purpose is to demonstrate the BeginCompressString, MoreCompressString, and EndCompressString methods.

Chilkat Java Downloads Java Libs for Windows, MacOS, Linux, Alpine Linux, Solaris Java Libs for Android

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    boolean success;
    CkBinData compressedData = new CkBinData();
    CkByteData compressedBytes = new CkByteData();

    CkCompression compress = new CkCompression();
    compress.put_Algorithm("deflate");
    compress.put_Charset("utf-8");

    CkStringBuilder sbIndex = new CkStringBuilder();

    int 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) {
            success = compress.BeginCompressString(sbIndex.getAsString(),compressedBytes);
            }
        else {
            success = compress.MoreCompressString(sbIndex.getAsString(),compressedBytes);
            }

        compressedData.AppendBinary(compressedBytes);
        success = compress.MoreCompressString(": This is a line of data to be compressed...\r\n",compressedBytes);
        compressedData.AppendBinary(compressedBytes);
        }

    // Flush any remaining output.
    success = compress.EndCompressString(compressedBytes);
    compressedData.AppendBinary(compressedBytes);

    // Show the compressed data in hex format:
    System.out.println("The hex encoded compressed text:");
    System.out.println(compressedData.getEncoded("hex"));

    // Now decompress in one call:
    success = compressedData.GetBinary(compressedBytes);
    String originalText = compress.decompressString(compressedBytes);
    System.out.println(originalText);
  }
}