104 lines
2.9 KiB
Java
104 lines
2.9 KiB
Java
//******************************************************************************
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//
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// File: fdATChunk.java
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// Package: edu.rit.image.png
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// Unit: Class edu.rit.image.png.fdATChunk
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//
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// This Java source file is copyright (C) 2013 by Alan Kaminsky. All rights
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// reserved. For further information, contact the author, Alan Kaminsky, at
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// ark@cs.rit.edu.
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//
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// This Java source file is part of the Parallel Java 2 Library ("PJ2"). PJ2 is
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// free software; you can redistribute it and/or modify it under the terms of
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// the GNU General Public License as published by the Free Software Foundation;
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// either version 3 of the License, or (at your option) any later version.
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//
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// PJ2 is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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// A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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//
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// A copy of the GNU General Public License is provided in the file gpl.txt. You
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// may also obtain a copy of the GNU General Public License on the World Wide
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// Web at http://www.gnu.org/licenses/gpl.html.
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//
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//******************************************************************************
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package edu.rit.image.png;
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import edu.rit.util.Packing;
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/**
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* Class fdATChunk provides a frame data chunk stored in an APNG file.
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*
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* @author Alan Kaminsky
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* @version 28-Jun-2013
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*/
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public class fdATChunk
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extends Chunk
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{
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// Exported constructors.
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/**
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* Construct a new uninitialized fdAT chunk. This constructor is for use
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* only by object deserialization.
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*/
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public fdATChunk()
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{
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super();
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}
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/**
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* Construct a new fdAT chunk with data taken from the given array.
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*
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* @param seqnum Chunk sequence number.
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* @param data Array of chunk data.
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*
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* @exception NullPointerException
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* (unchecked exception) Thrown if <TT>data</TT> is null.
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*/
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public fdATChunk
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(int seqnum,
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byte[] data)
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{
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this (seqnum, data, 0, data.length);
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}
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/**
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* Construct a new IDAT chunk with data taken from a portion of the given
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* array.
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*
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* @param seqnum Chunk sequence number.
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* @param data Array of chunk data.
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* @param off Index of first byte of chunk data.
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* @param len Number of bytes of chunk data.
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*
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* @exception NullPointerException
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* (unchecked exception) Thrown if <TT>data</TT> is null.
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* @exception IndexOutOfBoundsException
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* (unchecked exception) Thrown if <TT>off</TT> < 0, <TT>len</TT>
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* < 0, or <TT>off+len</TT> > <TT>data.length</TT>.
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*/
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public fdATChunk
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(int seqnum,
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byte[] data,
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int off,
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int len)
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{
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super (0x66644154, getData (seqnum, data, off, len));
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}
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private static byte[] getData
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(int seqnum,
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byte[] data,
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int off,
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int len)
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{
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byte[] moredata = new byte [4 + len];
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Packing.unpackIntBigEndian (seqnum, moredata, 0);
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System.arraycopy (data, off, moredata, 4, len);
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return moredata;
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}
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}
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