plexofcps.java

Office格式转换代码

/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2003 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * 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.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    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.
 *
 * 4. The names "Apache" and "Apache Software Foundation" and
 *    "Apache POI" must not be used to endorse or promote products
 *    derived from this software without prior written permission. For
 *    written permission, please contact [e-mail].
 *
 * 5. Products derived from this software may not be called "Apache",
 *    "Apache POI", nor may "Apache" appear in their name, without
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 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */
package org.apache.poi.hdf.model.hdftypes;


/**
 * common data structure in a Word file. Contains an array of 4 byte ints in
 * the front that relate to an array of abitrary data structures in the back.
 *
 * This class acts more like a pointer. In the sense that it doesn't store any
 * data. It only provides convenience methods for accessing a particular
 * PlexOfCps
 *
 * @author Ryan Ackley
 */
public class PlexOfCps
{
    private int _count;
    private int _offset;
    private int _sizeOfStruct;


    /**
     * Constructor
     *
     * @param size The size in bytes of this PlexOfCps
     * @param sizeOfStruct The size of the data structure type stored in
     *        this PlexOfCps.
     */
    public PlexOfCps(int size, int sizeOfStruct)
    {
        _count = (size - 4)/(4 + sizeOfStruct);
        _sizeOfStruct = sizeOfStruct;
    }
    public int getIntOffset(int index)
    {
      return index * 4;
    }
    /**
     * returns the number of data structures in this PlexOfCps.
     *
     * @return The number of data structures in this PlexOfCps
     */
    public int length()
    {
        return _count;
    }
    /**
     * Returns the offset, in bytes, from the beginning if this PlexOfCps to
     * the data structure at index.
     *
     * @param index The index of the data structure.
     *
     * @return The offset, in bytes, from the beginning if this PlexOfCps to
     *         the data structure at index.
     */
    public int getStructOffset(int index)
    {
        return (4 * (_count + 1)) + (_sizeOfStruct * index);
    }
}