/* ====================================================================
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
==================================================================== */
package org.apache.poi.hslf.blip;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.zip.InflaterInputStream;
import org.apache.poi.hslf.exceptions.HSLFException;
import org.apache.poi.hslf.model.Picture;
import org.apache.poi.hslf.model.Shape;
/**
* Represents Macintosh PICT picture data.
*
* @author Yegor Kozlov
*/
public final class PICT extends Metafile {
public PICT(){
super();
}
/**
* Extract compressed PICT data from a ppt
*/
public byte[] getData(){
byte[] rawdata = getRawData();
try {
byte[] macheader = new byte[512];
ByteArrayOutputStream out = new ByteArrayOutputStream();
out.write(macheader);
int pos = CHECKSUM_SIZE;
byte[] pict;
try {
pict = read(rawdata, pos);
} catch (IOException e){
//weird MAC behaviour.
//if failed to read right after the checksum - skip 16 bytes and try again
pict = read(rawdata, pos + 16);
}
out.write(pict);
return out.toByteArray();
} catch (IOException e){
throw new HSLFException(e);
}
}
private byte[] read(byte[] data, int pos) throws IOException {
ByteArrayOutputStream out = new ByteArrayOutputStream();
ByteArrayInputStream bis = new ByteArrayInputStream(data);
Header header = new Header();
header.read(data, pos);
bis.skip(pos + header.getSize());
InflaterInputStream inflater = new InflaterInputStream( bis );
byte[] chunk = new byte[4096];
int count;
while ((count = inflater.read(chunk)) >=0 ) {
out.write(chunk,0,count);
}
inflater.close();
return out.toByteArray();
}
public void setData(byte[] data) throws IOException {
int pos = 512; //skip the first 512 bytes - they are MAC specific crap
byte[] compressed = compress(data, pos, data.length-pos);
Header header = new Header();
header.wmfsize = data.length - 512;
//we don't have a PICT reader in java, have to set default image size 200x200
header.bounds = new com.google.code.appengine.awt.Rectangle(0, 0, 200, 200);
header.size = new com.google.code.appengine.awt.Dimension(header.bounds.width*Shape.EMU_PER_POINT,
header.bounds.height*Shape.EMU_PER_POINT);
header.zipsize = compressed.length;
byte[] checksum = getChecksum(data);
ByteArrayOutputStream out = new ByteArrayOutputStream();
out.write(checksum);
out.write(new byte[16]); //16-byte prefix which is safe to ignore
header.write(out);
out.write(compressed);
setRawData(out.toByteArray());
}
/**
* @see org.apache.poi.hslf.model.Picture#PICT
*/
public int getType(){
return Picture.PICT;
}
/**
* PICT signature is <code>0x5430</code>
*
* @return PICT signature (<code>0x5430</code>)
*/
public int getSignature(){
return 0x5430;
}
}