Problem: Storing binary data in Xml Cdata section

Question

The objective : Tranport image using xml
1. I convert the image to input stream.
2. store it in an array.
3. encode the string using Base64 library and get a string
4.then i store it in xml CDATA section.
the code snippet is
public class ImgToXml01 {
     public static void main(String[] args) throws IOException
          File inputFile = new File("C:\\Arup\\ImgXml\\read\\Sample.jpg");
          FileInputStream in = new FileInputStream(inputFile);
          String str="";
          int c;
          while ((c = in.read()) != -1) {
          str+= ""+c;
          String val = util.Base64.encode(str);
          System.out.println(""+val);
          OutputStream fout = new FileOutputStream("img.xml");
          OutputStreamWriter out = new OutputStreamWriter(fout);
          out.write("<?xml version = \"1.0\" encoding = \"ISO-8859-1\"?>\r\n");
          out.write("<Image>\r\n");
          out.write("[CDATA["+val+"]]");
          //out.write("]]>");
          out.write("</image>\r\n");
          out.close();
When i retrieve it i write the code:
import org.xmldb.api.base.*;
import org.xmldb.api.modules.*;
import org.xmldb.api.*;
import org.w3c.dom.*;
import java.io.*;
import org.xml.sax.SAXException;
import oracle.xml.parser.v2.*;
public class CdataToImage01 {
     public static void main(String[] args) //throws IOException
     try{
     String uri="c:\\Arup\\ImgXml\\img1.xml";
     String data="";      
     File file = new File(uri);
     FileInputStream fis = new FileInputStream(file);
     BufferedInputStream in = new BufferedInputStream(fis);      
     DOMParser parser = new DOMParser();
     parser.parse(in);      
     Document doc = parser.getDocument();
     Node r = doc.getElementsByTagName("Image").item(0);          
     NodeList kids = r.getChildNodes();
     if ( kids != null )     {
          for ( int i = 0; i < kids.getLength(); i++ ) {
               if ( (kids.item(i).getNodeType() == Node.TEXT_NODE) ||
                         (kids.item(i).getNodeType() == Node.CDATA_SECTION_NODE)) {
                         data=kids.item(i).getNodeValue();
          String data1 = util.Base64.decode(data);
          File outputFile = new File("Sample.jpg");
          FileOutputStream out = new FileOutputStream(outputFile);      
          byte[] buff = data1.getBytes();
          InputStream inn = new ByteArrayInputStream(buff);
          int c;
          System.out.println(buff.length);
          while ((c = inn.read()) != -1) {
          out.write(c);
          inn.close();
          out.close();
     catch (SAXException e) {
          System.err.println(e);
          e.printStackTrace();
     catch (Exception ex){
          System.err.println("Exception occured " + ex.getMessage());
          ex.printStackTrace();
But i am not getting the appropriate result .I get a corrupted image.
FROM
ARUP GHOSH

Answer 1

String str="";
int c;
while ((c = in.read()) != -1) {
str+= ""+c;
}Your problem is here.
Let's suppose you just have a trivial 3-byte file containing the bytes 27, 55, and 126. Your program will convert that into the string "2755126". Then you base-64 encode it, etc etc, then you base-64 decode it and (hopefully) produce the same string "2755126". Converting this string to bytes and writing it to a file produces a 7-byte file containing the bytes 50, 55, 53, 53, 49, 50, and 54. Not the same at all. You could prove this to yourself by putting in some debugging statements.
I don't know how to suggest a fix because it looks to me as if your base-64 utility takes a String as its input. It should take an array of bytes, or an InputStream.
PC&#178;