Compressiong And Decompression

Question

Hi,
I do have an issue with compression and decompression.
I have used following program to compress and decompress a file...
I don't have any issue in compression. But when same file is tried to
decompress I am getting some exception
<code>
public class Zipper {
     public static void main(String args[]) {
     try{
          Zipper zipper = new Zipper();
          if(args.length <= 0)
               throw new IllegalArgumentException("Please provide file name for compression");
          String compressedFileName = zipper.compress(args[0]);
          String deCompressedFileName = zipper.deCompress(compressedFileName);
}catch(Exception e){
          e.printStackTrace();
          //e.getCause().printStackTrace();
/*                                        INFLATER METHODS                                             */
     private String compress(String fileName)throws Exception{
          String outputName = fileName+".zipped";
          File inputFile = new File(fileName);
          File zippedFile = new File(outputName);
          //FileInputStream fips = new FileInputStream(inputFile);
          RandomAccessFile raf = new RandomAccessFile(inputFile,"r");
          //FileOutputStream fops = new FileOutputStream(zippedFile);
          RandomAccessFile rafOut = new RandomAccessFile(zippedFile,"rw");
          Deflater compresser = new Deflater(Deflater.BEST_COMPRESSION);
          byte[] buf = new byte[1000];
          byte[] out = new byte[50];
          int intialCount = 0;
          int zippedSize = 0;
          int count = 0;
          String tempString = null;
          while( (count = raf.read(buf)) != -1){
               intialCount += count;
               compresser.setInput(buf);
               compresser.finish();
               count = compresser.deflate(out);
               zippedSize += count;
               //tempString = new String(out);
               //tempString.trim();
               //fops.write(tempString.getBytes("UTF-8"));
               rafOut.write(out);
               compresser.reset();
          //fops.close();
          //fips.close();
          rafOut.close();
          System.out.println("Intial File Size "+intialCount);
          System.out.println("Zipped File Size "+zippedSize);
          return outputName;
     private String deCompress(String fileName)throws Exception{
          String outputName = fileName+".unzipped";
          File inputFile = new File(fileName);
          File zippedFile = new File(outputName);
          //FileInputStream fips = new FileInputStream(inputFile);
          RandomAccessFile raf = new RandomAccessFile(inputFile,"r");
          FileOutputStream fops = new FileOutputStream(zippedFile);
          Inflater deCompresser = new Inflater();
          byte[] buf = new byte[100];
          byte[] out = new byte[1000];
          int intialCount = 0;
          int unZippedSize = 0;
          int count = 0;
          String tempString = null;
          while( (count = raf.read(buf)) != -1){
               System.out.println("Count = "+count);
               intialCount += count;
               deCompresser.setInput(buf);
               count = deCompresser.inflate(out);
               unZippedSize += count;
               //tempString = new String(out);
               //tempString.trim();
               //fops.write(tempString.getBytes("UTF-8"));
               fops.write(out);
               deCompresser.reset();
          fops.close();
          raf.close();
          //fips.close();
          System.out.println("Intial File Size "+intialCount);
          System.out.println("UnZipped File Size "+unZippedSize);
          return outputName;
</code>
Exception I got is
Intial File Size 125952
Zipped File Size 4938
Count = 100
java.util.zip.DataFormatException: invalid bit length repeat
at java.util.zip.Inflater.inflateBytes(Native Method)
at java.util.zip.Inflater.inflate(Unknown Source)
at java.util.zip.Inflater.inflate(Unknown Source)
at Zipper.deCompress(Zipper.java:213)
at Zipper.main(Zipper.java:29)

Answer 1

How about some google?
Ans try this one: http://www.tinyline.com/utils/index.html