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(Java) Compress Large Binary File in Blocks

Compresses a large binary file in blocks. This example uses BeginCompressBytes, MoreCompressBytes, and EndCompressBytes.

Chilkat Java Downloads

Java Libs for Windows, Linux, Alpine Linux,
MAC OS X, Solaris, FreeBSD, OpenBSD,
Raspberry Pi and other single board computers

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 requires the Chilkat API to have been previously unlocked.
    //  See Compression UnlockComponent for sample code.

    CkFileAccess facSrc = new CkFileAccess();
    CkFileAccess facDest = new CkFileAccess();

    //  Open a large binary file for reading.
    boolean success = facSrc.OpenForRead("qa_data/bmp/big.bmp");
    if (success != true) {
        System.out.println(facSrc.lastErrorText());
        return;
        }

    //  If we compress in 64K chunks, find out how many blocks there will be.
    int blockSize = 65536;
    int numBlocks = facSrc.GetNumBlocks(blockSize);

    //  Open an output file for the compressed data.
    success = facDest.OpenForWrite("qa_data/bmp/compressedBmp.dat");
    if (success != true) {
        System.out.println(facDest.lastErrorText());
        return;
        }

    CkCompression compress = new CkCompression();
    compress.put_Algorithm("deflate");

    CkByteData fileBytes = new CkByteData();
    CkByteData compressedBytes = new CkByteData();

    int i = 0;
    while (i < numBlocks) {
        success = facSrc.ReadBlock(i,blockSize,fileBytes);
        if (i == 0) {
            success = compress.BeginCompressBytes(fileBytes,compressedBytes);
            }
        else {
            success = compress.MoreCompressBytes(fileBytes,compressedBytes);
            }

        facDest.FileWrite(compressedBytes);

        i = i+1;
        }

    //  At the very end, flush any remaining compressed bytes, if any.
    success = compress.EndCompressBytes(compressedBytes);
    facDest.FileWrite(compressedBytes);

    facSrc.FileClose();
    facDest.FileClose();

    System.out.println("Finished compressing file.");
  }
}

 

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