Getting "IOException Not in Gzip format "

Question

Hi,
I am getting this *"IOException Not in GZip format "* while Uncompresing.
I have checked the data. It's already in gzip format (compressed).
My Code looks like:-
byte[] HTMLCompress = new byte[contentlength];
            byte[] HTMLUnCompress = new byte[10000];
            if(b != null) {
                for( int total = b.length-1 , i = contentlength-1 ; i >= 0 ; i-- ){
                    HTMLCompress[i] = b[total--];
            String htmlstr = new String();
            if(HTMLCompress.length > 0) {
                ByteArrayInputStream bs = new ByteArrayInputStream(HTMLCompress);                
                System.out.println("Inside >> " + bs);
                GZIPInputStream gzp = new GZIPInputStream(bs,contentlength);                
                int noread = gzp.read(HTMLUnCompress);
                for( int i = 0 ; i < noread ; i++ ){
                    htmlstr += (char)HTMLUnCompress;
*Can anyone please suggest me what's the issue with this...*.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   

Answer 1

The exception is clear : IOException Not in GZip format
So check what contains really the variable 'b'.
Then what does the first loop ???
instead of
        for( int total = b.length-1 , i = contentlength-1 ; i >= 0 ; i-- ){
            HTMLCompress[i] = b[total--];
        }Try this :
        for (int i=0; i<b.length; i++) {
            HTMLCompress[i] = b;
or System.arraycopy(b, 0, HTMLCompress, 0, contentlength);
I repeat, probably b buffer doesn't containt gzip format. Check you stuff before sample code you posted.