title: Reading BITMAPFILEHEADER and BITMAPINFOHEADER from a BitMap
body: <p>I am converting a C++ Win32 app to Java (in linux) I need to read BITMAPFILEHEADER and 
  BITMAPINFOHEADER of bitmap , how could I do this ?
  I find a jna (java native access) library which is specialized for windows (I think).
  Has someone any idea ?</p>