Saving file, but jpg and gif comes out garbled

Question

Would someone please help me? I'm at my wit's end here. I'm writing a program that reads a file and saves it, but it needs to read a maximum of 512 bytes before it starts to write. It needs to work with both text files and images.
- It works fine with text files.
- It works fine with bmp images.
- It works fine with jpg and gif images under 512 bytes.
- With a jpg or gif over 512 bytes, it comes out all garbled, but the same file size as the original.
One thing is really confoozling me. When the image comes out garbled, I tried changing the files for both the original and the copy into text files by changing the file extension to .txt. Both the text files were identical! So if the data is identical, why is the copy not showing the same image as the original?
import java.io.*;
     public class SaveFile{
          public static final int BUFSIZE = 512;
          public static final String LIBRARY = "C:\\";
          static int totalRead = 0;  //Total number of bytes in buffer (Max BUFSIZE).
          static int fileSize = 0;  //Size of whole file.
              static String fileName = "";  //Name of file.
             static char[] data = new char[BUFSIZE];  //The data in the file.
          public static void main(String[] args){
                        //Bytes already read by the buffer.
                  int charsRead = BUFSIZE; 
                      //Takes name of file from main argument.
                     for(int i=0; i < args.length; i++)
                         fileName = fileName + args;
//Name of file including directory.
          String fetchFile = LIBRARY + fileName;
          File file1 = new File(fetchFile);
          * Reads a string from the file to data (char array).
               BufferedReader reader =
new BufferedReader(new FileReader(file1), BUFSIZE);
               BufferedWriter writer =
new BufferedWriter(new FileWriter(fileName));
               //Will continue as long as buffer is full.
               while (charsRead == BUFSIZE){ 
                    charsRead = reader.read(data, 0, BUFSIZE);
                    if (charsRead != -1) {
                         totalRead = charsRead;
                         write(writer);
                         fileSize = fileSize + totalRead;
               reader.close();
               writer.close();
          System.out.println((fileSize) + " bytes read and saved as " + fileName);
     * Writes data to a new file.
     public static void write(BufferedWriter writer) {
               for (int j = 0; j < totalRead; j++) {
                    writer.write(data[j]);
I stripped away the directory selection and error handling to make it simpler.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           

Answer 1

Cadvan1123 wrote:
I think the best choice is to use a ByteArrayOutputStreamWrong. You do not need a ByteArrayOutputStream
and I think that it uses ASCII encodingPossible, but you can't just make that assumption. On windows for instance, there's a good likelihood it could use ANSI. And BTW, ASCII is for the most part dead, as it has been superseded by UTF-8.
Check out t [jacobs.io.DataFetcher in TUS|http://tus.svn.sourceforge.net/viewvc/tus/tjacobs/] for a threadable and optimal/close-to-optimal solution for reading in binary files.
Edited by: tjacobs01 on Mar 20, 2010 2:56 PM