Help! Double BMP file

Question

it is needed to create a new BMP file exactly twice the height of an original BMP file(which is uncompressed), and consisting of two copies of the original image, one on top of the other .
now I have modify the file size (ie. size of the bit map data+file size); doule the vaule of height, bit map data size, and calculate where the bit map data section stats(ie.the bit map data offset info)
But now I am not sure hwo to duplicate the entirebit map data section, then how to useFileout putStream and write() method to create a new double BMP file
Can anyone give me an example? Many thx.
My code is following:
import java.io.*;
public class BMPDouble {
     public static void main(String[] args) throws IOException{
          File bmp= new File(args[0]);
          getBMPInfo(bmp);
     public static void getBMPInfo(File f) throws IOException {
          FileInputStream fis= new FileInputStream(f);
               int bflen=14;  // 14 byte BITMAPFILEHEADER
              byte bf[]=new byte[bflen];
              fis.read(bf,0,bflen);
              int bilen=40; // 40-byte BITMAPINFOHEADER
              byte bi[]=new byte[bilen];
              fis.read(bi,0,bilen);
              int nsize = (((int)bf[5]&0xff)<<24)
                              | (((int)bf[4]&0xff)<<16)
                              | (((int)bf[3]&0xff)<<8)
                              | (int)bf[2]&0xff;
              int nheight = (((int)bi[11]&0xff)<<24)
                              | (((int)bi[10]&0xff)<<16)
                              | (((int)bi[9]&0xff)<<8)
                              | (int)bi[8]&0xff;
               int bmdsize = (((int)bi[23]&0xff)<<24)
                              | (((int)bi[22]&0xff)<<16)
                              | (((int)bi[21]&0xff)<<8)
                              | (int)bi[20]&0xff;
               int offsetInfo = (((int)bf[13]&0xff)<<24)
                              | (((int)bf[12]&0xff)<<16)
                              | (((int)bf[11]&0xff)<<8)
                              | (int)bf[10]&0xff;
               int newSize = nsize+bmdsize;
               int newHeight = nheight*2;
               int newBmdSize = bmdsize*2;
               System.out.println("Size: "+newSize+" bytes");
               System.out.println("Height: "+newHeight);
               System.out.println("Bit Map Data Size: "+newBmdSize);
               System.out.println("Bit Map Data offset: "+offsetInfo);
               fis.close();

Answer 1

now,the code is all right.
but it is strange that the print output such as newSize, newHeight,new Bit Map Data Size and Bit Map Data offset equals 0.
Also, it exists IOException: disk has no enough space.
Why it will happen?
import java.io.*;
public class BMPDouble {
     public static void main(String[] args) throws IOException{
          File bmp= new File(args[0]);
          File bmpDouble= new File(args[1]);
          getBMPInfo(bmp);
          getBMPInfo(bmpDouble);
     public static void getBMPInfo(File f) throws IOException {
          FileInputStream fis= new FileInputStream(f);
          FileOutputStream fos= new FileOutputStream(f);
               int bflen=14;  // 14-byte BITMAPFILEHEADER
              byte bf[]=new byte[bflen];
              fis.read(bf,0,bflen);
              int bilen=40; // 40-byte BITMAPINFOHEADER
              byte bi[]=new byte[bilen];
              fis.read(bi,0,bilen);
              fis.mark((bflen+bilen)-1);
              int nsize = (((int)bf[5]&0xff)<<24)
                              | (((int)bf[4]&0xff)<<16)
                              | (((int)bf[3]&0xff)<<8)
                              | (int)bf[2]&0xff;
              int nheight = (((int)bi[11]&0xff)<<24)
                              | (((int)bi[10]&0xff)<<16)
                              | (((int)bi[9]&0xff)<<8)
                              | (int)bi[8]&0xff;
               int bmdsize = (((int)bi[23]&0xff)<<24)
                              | (((int)bi[22]&0xff)<<16)
                              | (((int)bi[21]&0xff)<<8)
                              | (int)bi[20]&0xff;
               int offsetInfo = (((int)bf[13]&0xff)<<24)
                              | (((int)bf[12]&0xff)<<16)
                              | (((int)bf[11]&0xff)<<8)
                              | (int)bf[10]&0xff;
               int newSize = nsize+bmdsize;
               int newHeight = nheight*2;
               int newBmdSize = bmdsize*2;
               System.out.println("Size: "+newSize+" bytes");
               System.out.println("Height: "+newHeight);
               System.out.println("Bit Map Data Size: "+newBmdSize);
               System.out.println("Bit Map Data offset: "+offsetInfo);
               byte[] NEWBITMAPFILEHEADER = new byte[bflen];
               byte[] NEWBITMAPINFOHEADER = new byte[bilen];
               byte[] incomeData = new byte[256];
               int bytesRead;
               fos.write(NEWBITMAPFILEHEADER,0,NEWBITMAPFILEHEADER.length);
               fos.write(NEWBITMAPINFOHEADER,0,NEWBITMAPINFOHEADER.length);
               while((bytesRead=fis.read(incomeData))!= -1){
                    fos.write(incomeData,0,incomeData.length);
               fis.reset();
               while((bytesRead=fis.read(incomeData)) != -1){    
                    fos.write(incomeData,0,incomeData.length);
               fos.flush();
               fos.close();
               fis.close();