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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) 2002 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.demo;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import jxl.WorkbookSettings;
import jxl.biff.BaseCompoundFile;
import jxl.read.biff.BiffException;
import jxl.read.biff.CompoundFile;
/**
* Generates a biff dump of the specified excel file
*/
class PropertySetsReader
{
private BufferedWriter writer;
private CompoundFile compoundFile;
/**
* Constructor
*
* @param file the file
* @param propertySet the property set to read
* @param os the output stream
* @exception IOException
* @exception BiffException
*/
public PropertySetsReader(java.io.File file, String propertySet,
OutputStream os)
throws IOException, BiffException
{
writer = new BufferedWriter(new OutputStreamWriter(os));
FileInputStream fis = new FileInputStream(file);
int initialFileSize = 1024*1024; // 1mb
int arrayGrowSize = 1024*1024;// 1mb
byte[] d = new byte[initialFileSize];
int bytesRead = fis.read(d);
int pos = bytesRead;
while (bytesRead != -1)
{
if (pos >= d.length)
{
// Grow the array
byte newArray[] = new byte[d.length + arrayGrowSize];
System.arraycopy(d, 0, newArray, 0, d.length);
d = newArray;
}
bytesRead = fis.read(d, pos, d.length - pos);
pos += bytesRead;
}
bytesRead = pos + 1;
compoundFile = new CompoundFile(d, new WorkbookSettings());
fis.close();
if (propertySet == null)
{
displaySets();
}
else
{
displayPropertySet(propertySet, os);
}
}
/**
* Displays the properties to the output stream
*/
void displaySets() throws IOException
{
int numSets = compoundFile.getNumberOfPropertySets();
for (int i = 0; i < numSets ; i++)
{
BaseCompoundFile.PropertyStorage ps = compoundFile.getPropertySet(i);
writer.write(Integer.toString(i));
writer.write(") ");
writer.write(ps.name);
writer.write("(type ");
writer.write(Integer.toString(ps.type));
writer.write(" size ");
writer.write(Integer.toString(ps.size));
writer.write(" prev " );
writer.write(Integer.toString(ps.previous));
writer.write(" next " );
writer.write(Integer.toString(ps.next));
writer.write(" child " );
writer.write(Integer.toString(ps.child));
writer.write(" start block " );
writer.write(Integer.toString(ps.startBlock));
writer.write(")");
writer.newLine();
}
writer.flush();
writer.close();
}
/**
* Write the property stream to the output stream
*/
void displayPropertySet(String ps, OutputStream os)
throws IOException,BiffException
{
if (ps.equalsIgnoreCase("SummaryInformation"))
{
ps = BaseCompoundFile.SUMMARY_INFORMATION_NAME;
}
else if (ps.equalsIgnoreCase("DocumentSummaryInformation"))
{
ps = BaseCompoundFile.DOCUMENT_SUMMARY_INFORMATION_NAME;
}
else if (ps.equalsIgnoreCase("CompObj"))
{
ps = BaseCompoundFile.COMP_OBJ_NAME;
}
byte[] stream = compoundFile.getStream(ps);
os.write(stream);
}
}