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(Java) Decompress Large Text File in Blocks

Decompresses a large text file in blocks, and compares the restored (decompressed) file with the original to make sure it's correct.

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.

    //  First, let's compress a text file.
    //  We'll then decompress in blocks, and compare the decompressed with the original file.

    //  Compress a text file:
    CkCompression compress = new CkCompression();
    compress.put_Algorithm("deflate");

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

    CkFileAccess fac = new CkFileAccess();

    //  Examine the uncompressed and compressed sizes:
    String originalPath = "qa_data/hamlet.xml";
    System.out.println("uncompressed size: " + fac.FileSize(originalPath));
    System.out.println("compressed size: " + fac.FileSize("qa_data/hamlet_compressed.dat"));

    //  Decompress in blocks..
    CkFileAccess facSrc = new CkFileAccess();
    CkFileAccess facDest = new CkFileAccess();

    facSrc.OpenForRead("qa_data/hamlet_compressed.dat");

    //  If we compress in 32K chunks, find out how many blocks there will be.
    int blockSize = 32768;
    int numBlocks = facSrc.GetNumBlocks(blockSize);

    //  Open an output file for the decompressed data.
    String restoredPath = "qa_output/hamlet_restored.xml";
    success = facDest.OpenForWrite(restoredPath);
    if (success != true) {
        System.out.println(facDest.lastErrorText());
        return;
        }

    String decompressedStr;
    CkByteData compressedBytes = new CkByteData();

    int i = 0;
    while (i < numBlocks) {
        success = facSrc.ReadBlock(i,blockSize,compressedBytes);
        if (i == 0) {
            decompressedStr = compress.beginDecompressString(compressedBytes);
            }
        else {
            decompressedStr = compress.moreDecompressString(compressedBytes);
            }

        facDest.AppendText(decompressedStr,"utf-8");

        i = i+1;
        }

    //  At the very end, flush any remaining content, if any.
    decompressedStr = compress.endDecompressString();
    facDest.AppendText(decompressedStr,"utf-8");

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

    //  Examine the size of the restored file.
    System.out.println("restored size: " + fac.FileSize(restoredPath));

    //  Compare the contents of the original with the restored.
    boolean bEqualContents = fac.FileContentsEqual(restoredPath,originalPath);
    System.out.println("Contents Equal: " + bEqualContents);
  }
}

 

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