FileInputStream src=null;            
       byte[] buffer=null;
       try {
           int i=0;
           File file = new File(source);
           buffer = new byte[ (int) file.length() ];
           src = new FileInputStream(source);
           CRC32 crc = new CRC32();
           src.read(buffer);
           crc.update( buffer );
           src.close();
           return crc.getValue();
       } 
       catch (FileNotFoundException e1) {
           
       }
       catch (IOException ex) {
           
       }    
       finally {
           try {
               if(src!=null) src.close();
           }
           catch (IOException e2) {
           
           } 
       }