Android™

Decompress Gzip Data In-Place Using BinData

See more Gzip Examples

This example demonstrates how to use the UncompressBd method to decompress Gzip data stored in a BinData object.

The compressed .gz file is first loaded into memory. The UncompressBd method then decompresses the data in-place, meaning the original compressed bytes in the BinData object are replaced with the uncompressed data.

After decompression, the example writes the resulting data to a file. This approach is useful when working entirely in memory before saving or further processing the uncompressed data.

Android™

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    boolean success = false;

    // This example demonstrates how to decompress Gzip data stored in a BinData object.
    // The decompression is done in-place, replacing the compressed data with the original data.

    CkGzip gzip = new CkGzip();
    CkBinData bd = new CkBinData();

    // Load a .gz file into BinData:
    success = bd.LoadFile("example.txt.gz");
    if (success == false) {
        Log.i(TAG, bd.lastErrorText());
        return;
        }

    Log.i(TAG, "Compressed size (bytes): " + String.valueOf(bd.get_NumBytes()));

    // Uncompress the data in-place:
    success = gzip.UncompressBd(bd);
    if (success == false) {
        Log.i(TAG, gzip.lastErrorText());
        return;
        }

    Log.i(TAG, "Decompressed size (bytes): " + String.valueOf(bd.get_NumBytes()));

    // Save the uncompressed data to a file:
    success = bd.WriteFile("example.txt");
    if (success == false) {
        Log.i(TAG, bd.lastErrorText());
        return;
        }

    Log.i(TAG, "File successfully uncompressed to example.txt");

  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}