Re: Getting header info of a BMP file

From:

"mmcclaf@gmail.com" <mmcclaf@gmail.com>

Newsgroups:

comp.lang.java.programmer

Date:

Mon, 7 Apr 2008 19:04:34 -0700 (PDT)

Message-ID:

<28fb88d9-1ade-4963-8143-1c782cead5be@u3g2000hsc.googlegroups.com>

Good news, I managed to get the next part to half work but I don't
think I'm getting the right bytes in for my colours.

// The "CSE390Lab3McClafferty" class.

import java.io.*;
import java.lang.*;
import java.text.*;

public class CSE390Lab3McClafferty
{
    public static void main (String[] args)
    {
        CSE390Lab3BMPMcClafferty pic = new CSE390Lab3BMPMcClafferty
();
        int nNumColors = 0;
        int count = 0;
        int indexer=0;

        try
        {
            File bmp = new File ("pic1.bmp");
            FileInputStream bitStream = new FileInputStream (bmp);
            bitStream.skip (2);
            pic.bfSize = bitStream.read () + bitStream.read () * 256 +
bitStream.read () * 65536 + bitStream.read () * 16777216;
            bitStream.skip (12);
            pic.biWidth = bitStream.read () + bitStream.read () * 256
+ bitStream.read () * 65536 + bitStream.read () * 16777216;
            pic.biHeight = bitStream.read () + bitStream.read () * 256
+ bitStream.read () * 65536 + bitStream.read () * 16777216;
            pic.biPlanes = bitStream.read () + bitStream.read () *
256;
            pic.biBitCount = bitStream.read () + bitStream.read () *
256;
            pic.biCompression = bitStream.read () + bitStream.read ()
* 256 + bitStream.read () * 65536 + bitStream.read () * 16777216;
            pic.biSizeImage = bitStream.read () + bitStream.read () *
256 + bitStream.read () * 65536 + bitStream.read () * 16777216;
            pic.biXPelsPerMeter = bitStream.read () + bitStream.read
() * 256 + bitStream.read () * 65536 + bitStream.read () * 16777216;
            pic.biYPelsPerMeter = bitStream.read () + bitStream.read
() * 256 + bitStream.read () * 65536 + bitStream.read () * 16777216;
            pic.biClrUsed = bitStream.read () + bitStream.read () *
256 + bitStream.read () * 65536 + bitStream.read () * 16777216;
            nNumColors = pic.biClrUsed;
            pic.biClrImportant = bitStream.read () + bitStream.read ()
* 256 + bitStream.read () * 65536 + bitStream.read () * 16777216;

            byte[] byBuf = new byte [4];
            int i = bitStream.read (byBuf);
            System.out.println (i);
            NumberFormat formatter = new DecimalFormat ("000");
            String index=formatter.format (indexer);
            System.out.print(index + " ");
            while ((i = bitStream.read (byBuf)) != -1)
            {
                if (i != 4)
                    throw new IOException ("Unexpected end of binary
data! bitmap is corrupted");

                int iRed = byBuf [0];
                int iGreen = byBuf [1];
                int iBlue = byBuf [2];
                int iUnused = byBuf [3];

                String dRed = formatter.format (iRed);
                String dGreen = formatter.format (iGreen);
                String dBlue = formatter.format (iBlue);
                String dUnused = formatter.format (iUnused);
                String oDisplay = dRed + "." + dGreen + "." + dBlue +
"." + dUnused + " ";
                count++;
                if (count == 5)
                {
                    System.out.println ("\n");
                    count =0;
                    indexer++;
                    index=formatter.format (indexer);
                    System.out.print (index + " ");
                }

                System.out.print (oDisplay);
            }

            pic.displayFileHeader ();
            pic.displayInfoHeader ();
            pic.displayColourTable ();

        }
        catch (Exception e)
        {
            System.out.println ("Exception Thrown: " + e);
        }

    } // main method

    // build an int from a byte array - convert little to big endian

    // set high order bytes to 0xfff

} // CSE390Lab3McClafferty class

Any ideas?