import sun.misc.*;
import java.io.*;
import java.awt.*;


public class HexDumpDecoder extends CharacterDecoder {

  protected int bytesPerAtom() {
    return 1;
  }

  protected int bytesPerLine()  {
    return 16;
  }

  protected void decodeAtom(InputStream in, OutputStream out, int l) 
   throws IOException {

    int c = in.read();
    while (c == ' ') c = in.read();

    char c1 = (char) c;
    char c2 = (char) in.read();
    // read the space
    int i1 = Character.digit(c1, 16); 
    int i2 = Character.digit(c2, 16); 
    in.read();   
    byte b = (byte) (i1*16 + i2);
    out.write(b);

  }

  protected int decodeLinePrefix(InputStream in, OutputStream out) 
   throws IOException {
    //
    for (int i = 0; i < 6; i++) in.read();
	return (bytesPerLine());
  }


  public static void main(String[] args) {

    try {
      FileDialog fd = new FileDialog(new Frame(), "Select the file to decode");
      fd.show();
      File theFile = new File(fd.getFile());
      HexDumpDecoder hd = new HexDumpDecoder();
      FileInputStream fis = new FileInputStream(theFile);
      FileOutputStream fos = new FileOutputStream(theFile + ".unhd");
      hd.decodeBuffer(fis, fos); 
   }
    catch (IOException e) {
      System.err.println(e);
    } 

  }

  /**
   * decodeLineSuffix in this decoder simply finds the [newLine] and
   * positions us past it.
   */
 protected void decodeLineSuffix(InputStream inStream, OutputStream outStream)
   throws java.io.IOException {

	int c;
	
	while (true) {
	  c = inStream.read();
	  if (c == -1) {
		throw new CEStreamExhausted();
	  }
	  if ((c == '\n') || (c == '\r')) {
		break;
	  }
    }

  }

}