gistfile1.java

/*
 * BMP FileHeader
 */
private class FileHeader { // 14 bytes
    public String signature;
    public int fileSize;
    public short reserved1;
    public short reserved2;
    public int fileOffsetToPixelArray;
    
    public FileHeader(String signature, 
    		int fileSize, 
    		short reserved1, 
    		short reserved2, 
    		int fileOffset) {
    	
    	this.signature = signature;
    	this.fileSize = fileSize;
    	this.reserved1 = reserved1;
    	this.reserved2 = reserved2;
    	this.fileOffsetToPixelArray = fileOffset;        	
    }
    
    public void write(DataOutputStreamLittleEndian dataOutputStream) throws IOException {
    	dataOutputStream.writeString(signature);
    	dataOutputStream.writeInt(fileSize);
    	dataOutputStream.writeShort(reserved1);
    	dataOutputStream.writeShort(reserved2);
    	dataOutputStream.writeInt(fileOffsetToPixelArray);
    }
}

/*
 * BMP DIBHeader 
 */
public static abstract class DIBHeader {
    public String name;
    public int sizeInBytes;

    public DIBHeader(String name, int sizeInBytes) {
        this.name = name;
        this.sizeInBytes = sizeInBytes;
    }        
     
    public abstract void writeToStream(DataOutputStreamLittleEndian reader);
}

public static class DIBHeaderBitmapInfo extends DIBHeader
{
    public int[] imageSizeInBytesXY;
    public short planes;
    public short bitsPerPixel;
    public int compression;
    public int imageSizeInBytes;
    public int[] pixelsPerMeterXY;
    public int numberOfColorsInPalette;
    public int numberOfColorsUsed;

    public int[] imageSizeInPixelsXY;

    public DIBHeaderBitmapInfo() {
        super("BitmapInfo", DIB_HEADER_SIZE);
    }

    public DIBHeaderBitmapInfo (
        int sizeInBytes,
        int[] imageSizeInPixelsXY,
        short planes,
        short bitsPerPixel,
        int compression,
        int imageSizeInBytes,
        int[] pixelsPerMeterXY,
        int numberOfColorsInPalette,
        int numberOfColorsUsed) {
    	
        this();
        this.sizeInBytes = sizeInBytes;
        this.imageSizeInPixelsXY = imageSizeInPixelsXY;
        this.planes = planes;
         this.bitsPerPixel = bitsPerPixel;
        this.compression = compression;
        this.imageSizeInBytes = imageSizeInBytes;    
        this.pixelsPerMeterXY = pixelsPerMeterXY;
        this.numberOfColorsInPalette = numberOfColorsInPalette;
        this.numberOfColorsUsed = numberOfColorsUsed;

        if (this.imageSizeInBytes == 0) {
            this.imageSizeInBytes =
                this.imageSizeInBytesXY[0]
                * this.imageSizeInBytesXY[1]
                * this.bitsPerPixel
                / 8;
        }
    }

    public void writeToStream(DataOutputStreamLittleEndian writer) {
        try {
            writer.writeInt(this.sizeInBytes);
            writer.writeInt(this.imageSizeInPixelsXY[0]);
            writer.writeInt(this.imageSizeInPixelsXY[1]);

            writer.writeShort(this.planes);
            writer.writeShort(this.bitsPerPixel);
            writer.writeInt(this.compression);
            writer.writeInt(this.imageSizeInBytes);

            writer.writeInt(this.pixelsPerMeterXY[0]);
            writer.writeInt(this.pixelsPerMeterXY[1]);

            writer.writeInt(numberOfColorsInPalette);
            writer.writeInt(numberOfColorsUsed);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
}