p;     System.out.println("error writing to file");
        }
       
        /**
         * Close input stream and file writer
         */
        try {
            is.close();
            writer.close();
        }
        catch (IOException e1) {
            System.out.println("Error closing file.");
        }
    }
   
    public void decodeFile (String filename) {
       
        FileReader reader = null;
        OutputStream os = null;
        try {
            reader = new FileReader(filename);
            os = new FileOutputStream(filename.replaceAll(".enc", ".dec"));
        }
        catch (FileNotFoundException e1) {
            if (reader == null)
                System.out.println("File not found: " + filename);
            else
                System.out.println("File not found: " + filename.replaceAll(".enc", "dec"));
        }
       
        BufferedReader br = new BufferedReader(reader);
        int offset;
        byte[] temp, toFile;
        StringTokenizer st = null;
        try {
            while (br.ready()) {
                st = new StringTokenizer(br.readLine());
                while (st.hasMoreTokens()){
                    toFile = encodeDecode(new BigInteger(st.nextToken())).toByteArray();
                    System.out.println(toFile.length + " x " + (blockSize / 8));
                   
                    if (toFile[0] == 0 && toFile.length != (blockSize / 8)) {
                        temp = new byte[blockSize / 8];
                        offset = temp.length - toFile.length;
                        for (int i = toFile.length - 1; (i <= 0) && ((i + offset) <= 0); --i) {
                            temp[i + offset] = toFile[i];
                        }
                        toFile = tem

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