/*
* Created on Feb 5, 2008
* Created by Olivier Chalouhi
*
* Copyright 2008 Vuze, Inc. All rights reserved.
*
* This program 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; version 2 of the License only.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
*/
package com.aelitis.azureus.core.util.png;
import java.io.ByteArrayOutputStream;
import java.util.zip.Deflater;
import java.util.zip.DeflaterOutputStream;
public class IDATChunk extends CRCedChunk {
private static final byte[] type = {(byte) 73, (byte) 68, (byte) 65, (byte) 84 };
private int width;
private int height;
public IDATChunk(int width, int height) {
super(type);
this.width = width;
this.height = height;
}
public byte[] getContentPayload() {
byte[] payload = new byte[(width+1)*height];
for(int i = 0; i<height ; i++) {
int offset = i * (width+1);
//NO filter on this line
payload[offset++] = 0;
for(int j = 0 ; j<width ; j++) {
payload[offset+j] = (byte)(127);
}
}
Deflater deflater = new Deflater( Deflater.DEFAULT_COMPRESSION );
ByteArrayOutputStream outBytes = new ByteArrayOutputStream((width+1)*height);
DeflaterOutputStream compBytes = new DeflaterOutputStream( outBytes, deflater );
try {
compBytes.write(payload);
compBytes.close();
} catch(Exception e) {
e.printStackTrace();
}
byte[] compPayload = outBytes.toByteArray();
return compPayload;
}
}