/***************************************************************************** * * $Id: ComponentMappingBox.java,v 1.1.1.1 2002/08/02 09:48:16 grosbois Exp $ * * Copyright Eastman Kodak Company, 343 State Street, Rochester, NY 14650 * $Date $ *****************************************************************************/package colorspace.boxes;import colorspace .ColorSpaceException;import icc .ICCProfile;import jj2000.j2k.util.ParameterList;import jj2000.j2k.io.RandomAccessIO;import java.io.IOException;import java.util.Enumeration;import java.util.Vector;/** * This class maps the components in the codestream * to channels in the image.  It models the Component * Mapping box in the JP2 header. *  * @version	1.0 * @author	Bruce A. Kern */public final class ComponentMappingBox extends JP2Box{    static { type = 0x636d6170; }    private int nChannels;    private Vector map = new Vector();    /**     * Construct a ComponentMappingBox from an input image.     *   @param in RandomAccessIO jp2 image     *   @param boxStart offset to the start of the box in the image     * @exception IOException, ColorSpaceException      */    public ComponentMappingBox (RandomAccessIO in, int boxStart)        throws IOException, ColorSpaceException {        super (in, boxStart);         readBox(); }    /** Analyze the box content. */    void readBox() throws IOException {        nChannels = (boxEnd-dataStart) / 4;        in.seek(dataStart);        for (int offset=dataStart; offset<boxEnd; offset += 4) {            byte [] mapping = new byte[4];            in.readFully(mapping,0,4);            map.addElement(mapping); }}    /* Return the number of mapped channels. */    public int getNChannels () {        return nChannels; }    /* Return the component mapped to the channel. */    public int getCMP (int channel) {        byte [] mapping = (byte[]) map.elementAt(channel);        return ICCProfile.getShort(mapping, 0) & 0x0000ffff; }    /** Return the channel type. */    public short getMTYP (int channel) {        byte [] mapping = (byte[]) map.elementAt(channel);        return (short) (mapping[2] & 0x00ff); }    /** Return the palette index for the channel. */    public short getPCOL (int channel) {        byte [] mapping = (byte[]) map.elementAt(channel);        return (short) (mapping[3] & 0x000ff); }    /** Return a suitable String representation of the class instance. */    public String toString () {        StringBuffer rep = new StringBuffer ("[ComponentMappingBox ").append("  ");        rep.append("nChannels= ").append(String.valueOf(nChannels));        Enumeration enum = map.elements();        while (enum.hasMoreElements()) {            byte [] bfr = (byte[]) enum.nextElement();            rep.append(eol).append("  ").append("CMP= ").append(String.valueOf(getCMP(bfr))).append(", ");            rep.append("MTYP= ").append(String.valueOf(getMTYP(bfr))).append(", ");            rep.append("PCOL= ").append(String.valueOf(getPCOL(bfr))); }        rep.append ("]");        return rep.toString(); }    private int getCMP (byte [] mapping) {        return ICCProfile.getShort(mapping, 0) & 0x0000ffff; }    private short getMTYP (byte [] mapping) {        return (short) (mapping[2] & 0x00ff); }    private short getPCOL (byte [] mapping) {        return (short) (mapping[3] & 0x000ff); }    /* end class ComponentMappingBox */ }