(Java) 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.

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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[])
  {
    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) {
        System.out.println(bd.lastErrorText());
        return;
        }

    System.out.println("Compressed size (bytes): " + bd.get_NumBytes());

    // Uncompress the data in-place:
    success = gzip.UncompressBd(bd);
    if (success == false) {
        System.out.println(gzip.lastErrorText());
        return;
        }

    System.out.println("Decompressed size (bytes): " + bd.get_NumBytes());

    // Save the uncompressed data to a file:
    success = bd.WriteFile("example.txt");
    if (success == false) {
        System.out.println(bd.lastErrorText());
        return;
        }

    System.out.println("File successfully uncompressed to example.txt");
  }
}