import java.awt.*;
import java.awt.image.*;
import javax.imageio.ImageIO;
import java.io.File;
import java.io.IOException;
class JPGwks {

static void pl(String m){System.out.println(m);}
static void pb(byte[] x){for(int k=0; k<x.length; ++k) System.out.print(" "+x[k]); pl("");}
static void pi(int[] x){for(int k=0; k<x.length; ++k) System.out.print(" "+x[k]); pl("");}
static Boolean sc(String a, String b) {if (false) return (a==b); else
{int al = a.length(); if(al != b.length()) return false;
  {char[] ba = a.toCharArray(), bb = b.toCharArray();
  for(int j=0; j<al; ++j) if(ba[j] != bb[j]) return false;} return true;}}
// The above routine returns different answers if the first 'false' is changed to 'true'.
// I think it is a Java bug.

private native void mutate(WritableRaster r);

    static public void main(String[] args){
      try {BufferedImage I = ImageIO.read(new File(args[0]));
        WritableRaster wr = I.getRaster();
        int nde = wr.getNumDataElements(), tt = wr.getTransferType();
        pl("Here: bnds="+wr.getBounds() +", numDataElements="+nde+", tt="+tt);
        pl(">"+((wr.getDataElements(0, 0, null)).getClass()).getCanonicalName()+"<");
        {String tp = ((wr.getDataElements(0, 0, null)).getClass()).getCanonicalName();
         if(!sc(tp, "byte[]")) {
           pl("wrong type: >"+ tp + "<"); return;}}
        pl("Has "+((byte[])wr.getDataElements(0, 0, null)).length+" bytes.");
        for(int i=0; i<2; ++i) for(int j=0; j<5; ++j) {
          pb((byte[])wr.getDataElements(i, j, null));}
        {DataBuffer db = wr.getDataBuffer();
          pl("DataType = "+db.getDataType()
             +"; Size = "+db.getSize()
             +"; DataTypeSize = "+db.getDataTypeSize(db.TYPE_BYTE)
             +" bits; Offsets = ");
          pi(db.getOffsets()); System.out.print("first elements = ");
          for(int j = 0; j<5; ++j) System.out.print(" "+db.getElem(j));
          pl("");}
        new JPGwks().mutate(wr);
        try {ImageIO.write(I, "jpg", new File(args[1]));}
        catch (IOException e) {System.err.println("image not saved.");}}
      catch (IOException e) {System.err.println("File not read.");}}
      static {System.loadLibrary("JPGwks");}}