35  * @author shura
  36  */
  37 public class PNGSaver {
  38 
  39     /**
  40      * black and white image mode.
  41      */
  42     public static final byte BW_MODE = 0;
  43     /**
  44      * grey scale image mode.
  45      */
  46     public static final byte GREYSCALE_MODE = 1;
  47     /**
  48      * full color image mode.
  49      */
  50     public static final byte COLOR_MODE = 2;
  51     OutputStream out;
  52     CRC32 crc;
  53     byte mode;
  54 
  55     /**
  56      *
  57      * @param file
  58      * @throws java.io.FileNotFoundException
  59      */
  60     public PNGSaver(File file) throws FileNotFoundException {
  61         this(new FileOutputStream(file));
  62     }
  63 
  64     /**
  65      * public constructor of PNGEncoder class with greyscale mode by default.
  66      *
  67      * @param out output stream for PNG image format to write into
  68      */
  69     public PNGSaver(OutputStream out) {
  70         this(out, COLOR_MODE);
  71     }
  72 
  73     /**
  74      * public constructor of PNGEncoder class.
  75      *
  76      * @param out output stream for PNG image format to write into
  77      * @param mode BW_MODE, GREYSCALE_MODE or COLOR_MODE
  78      */
  79     public PNGSaver(OutputStream out, byte mode) {

  35  * @author shura
  36  */
  37 public class PNGSaver {
  38 
  39     /**
  40      * black and white image mode.
  41      */
  42     public static final byte BW_MODE = 0;
  43     /**
  44      * grey scale image mode.
  45      */
  46     public static final byte GREYSCALE_MODE = 1;
  47     /**
  48      * full color image mode.
  49      */
  50     public static final byte COLOR_MODE = 2;
  51     OutputStream out;
  52     CRC32 crc;
  53     byte mode;
  54 





  55     public PNGSaver(File file) throws FileNotFoundException {
  56         this(new FileOutputStream(file));
  57     }
  58 
  59     /**
  60      * public constructor of PNGEncoder class with greyscale mode by default.
  61      *
  62      * @param out output stream for PNG image format to write into
  63      */
  64     public PNGSaver(OutputStream out) {
  65         this(out, COLOR_MODE);
  66     }
  67 
  68     /**
  69      * public constructor of PNGEncoder class.
  70      *
  71      * @param out output stream for PNG image format to write into
  72      * @param mode BW_MODE, GREYSCALE_MODE or COLOR_MODE
  73      */
  74     public PNGSaver(OutputStream out, byte mode) {