| /* PNGData.java -- PNG IDAT chunk. |
| Copyright (C) 2006 Free Software Foundation |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| package gnu.javax.imageio.png; |
| |
| import java.util.zip.Inflater; |
| import java.util.zip.Deflater; |
| |
| /** |
| * A PNG IDAT (data) chunk. |
| */ |
| public class PNGData extends PNGChunk |
| { |
| private int offset; |
| |
| protected PNGData( int type, byte[] data, int crc ) |
| { |
| super( type, data, crc ); |
| } |
| |
| protected PNGData( int chunkSize ) |
| { |
| super( PNGChunk.TYPE_DATA ); |
| data = new byte[ chunkSize ]; |
| offset = 0; |
| } |
| |
| /** |
| * Deflates the available data in def to the chunk. |
| * |
| * @return true if the chunk is filled and no more data can be written, |
| * false otherwise. |
| */ |
| public void deflateToChunk( Deflater def ) |
| { |
| offset += def.deflate( data, offset, data.length - offset ); |
| } |
| |
| /** |
| * Returns true if the chunk is filled. |
| */ |
| public boolean chunkFull() |
| { |
| return (offset >= data.length); |
| } |
| |
| /** |
| * Shrink the chunk to offset size, used for the last chunk in a stream |
| * (no trailing data!) |
| */ |
| public void shrink() |
| { |
| byte[] newData = new byte[ offset ]; |
| System.arraycopy( data, 0, newData, 0, offset ); |
| data = newData; |
| } |
| |
| /** |
| * Feeds the data in the chunk to a ZIP inflater object. |
| */ |
| public void feedToInflater( Inflater inf ) |
| { |
| inf.setInput( data ); |
| } |
| |
| public String toString() |
| { |
| return "PNG Data chunk. Length = "+data.length; |
| } |
| } |