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JExcelApi is a java library which provides the ability to read, write, and modify Microsoft Excel spreadsheets.
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/*********************************************************************
*
* Copyright (C) 2003 Andrew Khan
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
***************************************************************************/
package jxl.biff.drawing;
import java.io.IOException;
import jxl.common.Assert;
import jxl.common.Logger;
import jxl.biff.IntegerHelper;
/**
* The data for this blip store entry. Typically this is the raw image data
*/
class BlipStoreEntry extends EscherAtom
{
/**
* The logger
*/
private static Logger logger = Logger.getLogger(BlipStoreEntry.class);
/**
* The type of the blip
*/
private BlipType type;
/**
* The image data read in
*/
private byte[] data;
/**
* The length of the image data
*/
private int imageDataLength;
/**
* The reference count on this blip
*/
private int referenceCount;
/**
* Flag to indicate that this entry was specified by the API, and not
* read in
*/
private boolean write;
/**
* The start of the image data within this blip entry
*/
private static final int IMAGE_DATA_OFFSET = 61;
/**
* Constructor
*
* @param erd the escher record data
*/
public BlipStoreEntry(EscherRecordData erd)
{
super(erd);
type = BlipType.getType(getInstance());
write = false;
byte[] bytes = getBytes();
referenceCount = IntegerHelper.getInt(bytes[24], bytes[25],
bytes[26], bytes[27]);
}
/**
* Constructor
*
* @param d the drawing
* @exception IOException
*/
public BlipStoreEntry(Drawing d) throws IOException
{
super(EscherRecordType.BSE);
type = BlipType.PNG;
setVersion(2);
setInstance(type.getValue());
byte[] imageData = d.getImageBytes();
imageDataLength = imageData.length;
data = new byte[imageDataLength + IMAGE_DATA_OFFSET];
System.arraycopy(imageData, 0, data, IMAGE_DATA_OFFSET, imageDataLength);
referenceCount = d.getReferenceCount();
write = true;
}
/**
* Accessor for the blip type
*
* @return the blip type
*/
public BlipType getBlipType()
{
return type;
}
/**
* Gets the data for this blip so that it can be written out
*
* @return the data for the blip
*/
public byte[] getData()
{
if (write)
{
// Drawing has been specified by API
// Type on win32
data[0] = (byte) type.getValue();
// Type on MacOs
data[1] = (byte) type.getValue();
// The blip identifier
// IntegerHelper.getTwoBytes(0xfce1, data, 2);
// Unused tags - 18 bytes
// System.arraycopy(stuff, 0, data, 2, stuff.length);
// The size of the file
IntegerHelper.getFourBytes(imageDataLength + 8 + 17, data, 20);
// The reference count on the blip
IntegerHelper.getFourBytes(referenceCount, data, 24);
// Offset in the delay stream
IntegerHelper.getFourBytes(0, data, 28);
// Usage byte
data[32] = (byte) 0;
// Length of the blip name
data[33] = (byte) 0;
// Last two bytes unused
data[34] = (byte) 0x7e;
data[35] = (byte) 0x01;
// The blip itself
data[36] = (byte) 0;
data[37] = (byte) 0x6e;
// The blip identifier
IntegerHelper.getTwoBytes(0xf01e, data, 38);
// The length of the blip. This is the length of the image file plus
// 16 bytes
IntegerHelper.getFourBytes(imageDataLength + 17, data, 40);
// Unknown stuff
// System.arraycopy(stuff, 0, data, 44, stuff.length);
}
else
{
// drawing has been read in
data = getBytes();
}
return setHeaderData(data);
}
/**
* Reduces the reference count in this blip. Called when a drawing is
* removed
*/
void dereference()
{
referenceCount--;
Assert.verify(referenceCount >= 0);
}
/**
* Accessor for the reference count on the blip
*
* @return the reference count on the blip
*/
int getReferenceCount()
{
return referenceCount;
}
/**
* Accessor for the image data.
*
* @return the image data
*/
byte[] getImageData()
{
byte[] allData = getBytes();
byte[] imageData = new byte[allData.length - IMAGE_DATA_OFFSET];
System.arraycopy(allData, IMAGE_DATA_OFFSET,
imageData, 0, imageData.length);
return imageData;
}
}