apache-poi/src/java/org/apache/poi/hpsf/ClassID.java

/*
 *  ====================================================================
 *  The Apache Software License, Version 1.1
 *
 *  Copyright (c) 2000 The Apache Software Foundation.  All rights
 *  reserved.
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 *  modification, are permitted provided that the following conditions
 *  are met:
 *
 *  1. Redistributions of source code must retain the above copyright
 *  notice, this list of conditions and the following disclaimer.
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 *  notice, this list of conditions and the following disclaimer in
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 *  if any, must include the following acknowledgment:
 *  "This product includes software developed by the
 *  Apache Software Foundation (http://www.apache.org/)."
 *  Alternately, this acknowledgment may appear in the software itself,
 *  if and wherever such third-party acknowledgments normally appear.
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package org.apache.poi.hpsf;

import java.io.*;
import org.apache.poi.util.LittleEndian;

/**
 *  REWRITE ME
 *  <p>
 *  Represents a class ID (16 bytes). Unlike other little-endian type the {@link
 *  ClassID} is not just 16 bytes stored in the wrong order. Instead, it is a
 *  double word (4 bytes) followed by two words (2 bytes each) followed by 8
 *  bytes.</p>
 *
 *@author     Rainer Klute (klute@rainer-klute.de)
 *@created    May 10, 2002
 *@see        LittleEndian
 *@version    $Id$
 *@since      2002-02-09
 */
public class ClassID {

    /**
     *  <p>
     *
     *  Creates a {@link ClassID} and reads its value from a byte array.</p>
     *
     *@param  src     The byte array to read from.
     *@param  offset  The offset of the first byte to read.
     */
    public ClassID(final byte[] src, final int offset) {
 //       super(src, offset);
    }



    public final static int LENGTH = 16;

    public int length() {
        return LENGTH;
    }

    public byte[] getBytes() {

        throw new RuntimeException("This fucntion must be rewritten");
    }


    /**
     *  Description of the Method - REWRITE ME REWRITE ME REWRITE ME
     *  ISNT += offset a bug?  -- doesn't the order of operations evaluate that
     * last?
     *
     *@param  src     Description of the Parameter
     *@param  offset  Description of the Parameter
     *@return         Description of the Return Value
     */
    public byte[] read(byte[] src, int offset) {
        byte[] retval = new byte[24];

        //throw new RuntimeException("This fucntion must be rewritten");

        //Number[] b = new Number[11];

        //b[0] = new Integer(LittleEndian.getInt(src, offset));
        //transfer the first Int from little to big endian
        retval[0] = src[3];
        retval[1] = src[2];
        retval[2] = src[1];
        retval[3] = src[0];

        //b[1] = new Short(LittleEndian.getInt(src, offset += LittleEndian.INT_SIZE));
        //transfer the second short from little to big endian
        retval[4] = src[5];
        retval[5] = src[4];

        //b[2] = new Short(LittleEndian.getInt(src, offset += LittleEndian.SHORT_SIZE));
        //transfer the third short from little to big endian
        retval[6] = src[7];
        retval[7] = src[6];

        System.arraycopy(src, 8, retval, 8, retval.length - 8);

        return retval;
    }

}