PPMD Compress File

Demonstrates how to use the PPMD compression algorithm to compress a file. This code is capable of compressing any size file because the file data is compressed from input to output in a streaming mode. The output file does not contain any "PPMD" header -- it is purely PPMD compressed data.

The functionality in this example is available in pre-release only:

Download Chilkat Java Library (Pre-Release)

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[])
  {
    CkCompression compress = new CkCompression();

    //  Any string argument automatically begins a 30-day trial.
    boolean success;
    success = compress.UnlockComponent("30-day trial");
    if (success != true) {
        System.out.println("Compression component unlock failed");
        return;
    }

    compress.put_Algorithm("ppmd");

    success = compress.CompressFile("hamlet.xml","hamletPpmd.dat");
    if (success != true) {
        System.out.println(compress.lastErrorText());
        return;
    }

    //  Decompress back to the original:
    success = compress.DecompressFile("hamletPpmd.dat","hamletInflated.xml");
    if (success != true) {
        System.out.println(compress.lastErrorText());
        return;
    }

    System.out.println("Success!");
  }
}