package bmpviewer.bmp;

/**
 * Super class of BmpReader and BmpWriter.
 * <p>
 * @author      Hiroyuki Murata
 * @since       JDK1.1
 */
public abstract class BmpHeader {
    static final int
        // pointers in BITMAPFILEHEADER
        pbfType          =  0, // (2)
        pbfSize          =  2, // (4)
        pbfReserved1     =  6, // (2)
        pbfReserved2     =  8, // (2)
        pbfOffBits       = 10, // (4)
        bf_size          = 14,
        // pointers in BITMAPINFOHEADER
        pbiSize          =  0, // (4)
        pbiWidth         =  4, // (4)
        pbiHeight        =  8, // (4)
        pbiPlanes        = 12, // (2)
        pbiBitCount      = 14, // (2)
        pbiCompression   = 16, // (4)
        pbiSizeImage     = 20, // (4)
        pbiXPelsPerMeter = 24, // (4)
        pbiYPelsPerMeter = 28, // (4)
        pbiClrUsed       = 32, // (4)
        pbiClrImportant  = 36, // (4)
        bi_size          = 40
    ;

    int
        // members of BITMAPFILEHEADER
        bfType,          // (2) Type of object; set to "BM"
        bfSize,          // (4) Size of the file, in bytes.
        bfReserved1,     // (2) Reserved, set to zero.
        bfReserved2,     // (2) Reserved, set to zero.
        bfOffBits,       // (4) Offset, in bytes, from this structure
                         //      to the actual bitmap in the file.
        // members of BITMAPINFOHEADER
        biSize,          // (4) # of bytes required by this structure.
        biWidth,         // (4) Width of the image, in pixels.
        biHeight,        // (4) Height of the image, in pixels.
        biPlanes,        // (2) # of planes for the target device.
        biBitCount,      // (2) # of bits per pixel. Must be 1, 4, 8, or 24.
        biCompression,   // (4) Specifies the compression used.
        biSizeImage,     // (4) Size of the image, in bytes.
        biXPelsPerMeter, // (4) Horizontal resolution of the image.
        biYPelsPerMeter, // (4) Vertical resolution of the image.
        biClrUsed,       // (4) # of colors in the color table used by the image.
        biClrImportant   // (4) # of important colors.
    ;

    ByteArrayManipulator fileheader,infoheader;

    /**
     * String representation.
     */
    public String toString() {
        return
            "bfType          = " + fileToHex2(pbfType)          + "\n" +
            "bfSize          = " + fileToHex4(pbfSize)          + "\n" +
            "bfReserved1     = " + fileToHex2(pbfReserved1)     + "\n" +
            "bfReserved2     = " + fileToHex2(pbfReserved2)     + "\n" +
            "bfOffBits       = " + fileToHex4(pbfOffBits)       + "\n" +
            "biSize          = " + infoToHex4(pbiSize)          + "\n" +
            "biWidth         = " + infoToHex4(pbiWidth)         + "\n" +
            "biHeight        = " + infoToHex4(pbiHeight)        + "\n" +
            "biPlanes        = " + infoToHex2(pbiPlanes)        + "\n" +
            "biBitCount      = " + infoToHex2(pbiBitCount)      + "\n" +
            "biCompression   = " + infoToHex4(pbiCompression)   + "\n" +
            "biSizeImage     = " + infoToHex4(pbiSizeImage)     + "\n" +
            "biXPelsPerMeter = " + infoToHex4(pbiXPelsPerMeter) + "\n" +
            "biYPelsPerMeter = " + infoToHex4(pbiYPelsPerMeter) + "\n" +
            "biClrUsed       = " + infoToHex4(pbiClrUsed)       + "\n" +
            "biClrImportant  = " + infoToHex4(pbiClrImportant)
        ;
    }

    String fileToHex2(int i) {
        return toHex2(fileheader.getU2(i));
    }
    String fileToHex4(int i) {
        return toHex4(fileheader.getS4(i));
    }
    String infoToHex2(int i) {
        return toHex2(infoheader.getU2(i));
    }
    String infoToHex4(int i) {
        return toHex4(infoheader.getS4(i));
    }

    String toHex2(int in) {
        String ret = Integer.toString(in & 0xffff, 16);
        while (ret.length() < 4)
            ret = "0" + ret;
        return "    " + ret + " (" + in + ")";
    }
    String toHex4(int in) {
        long lo = (long)in & 0xffffffffL;
        String ret = Long.toString(lo, 16);
        while (ret.length() < 8)
            ret = "0" + ret;
        return ret + " (" + lo + ")";
    }
}