/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2002 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" and
* "Apache POI" must not be used to endorse or promote products
* derived from this software without prior written permission. For
* written permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* "Apache POI", nor may "Apache" appear in their name, without
* prior written permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
package org.apache.poi.poifs.filesystem;
import java.io.*;
import java.util.*;
import org.apache.poi.poifs.common.POIFSConstants;
import org.apache.poi.poifs.dev.POIFSViewable;
import org.apache.poi.poifs.property.DirectoryProperty;
import org.apache.poi.poifs.property.DocumentProperty;
import org.apache.poi.poifs.property.Property;
import org.apache.poi.poifs.property.PropertyTable;
import org.apache.poi.poifs.storage.BATBlock;
import org.apache.poi.poifs.storage.BlockAllocationTableReader;
import org.apache.poi.poifs.storage.BlockAllocationTableWriter;
import org.apache.poi.poifs.storage.BlockList;
import org.apache.poi.poifs.storage.BlockWritable;
import org.apache.poi.poifs.storage.HeaderBlockReader;
import org.apache.poi.poifs.storage.HeaderBlockWriter;
import org.apache.poi.poifs.storage.RawDataBlock;
import org.apache.poi.poifs.storage.RawDataBlockList;
import org.apache.poi.poifs.storage.SmallBlockTableReader;
import org.apache.poi.poifs.storage.SmallBlockTableWriter;
import org.apache.poi.poifs.storage.SmallDocumentBlock;
/**
* This is the main class of the POIFS system; it manages the entire
* life cycle of the filesystem.
*
* @author Marc Johnson (mjohnson at apache dot org)
*/
public class POIFSFileSystem
implements POIFSViewable
{
private PropertyTable _property_table;
private List _documents;
private DirectoryNode _root;
/**
* Constructor, intended for writing
*/
public POIFSFileSystem()
{
_property_table = new PropertyTable();
_documents = new ArrayList();
_root = null;
}
/**
* Create a POIFSFileSystem from an InputStream
*
* @param stream the InputStream from which to read the data
*
* @exception IOException on errors reading, or on invalid data
*/
public POIFSFileSystem(final InputStream stream)
throws IOException
{
this();
// read the header block from the stream
HeaderBlockReader header_block_reader = new HeaderBlockReader(stream);
// read the rest of the stream into blocks
RawDataBlockList data_blocks = new RawDataBlockList(stream);
// set up the block allocation table (necessary for the
// data_blocks to be manageable
new BlockAllocationTableReader(header_block_reader.getBATCount(),
header_block_reader.getBATArray(),
header_block_reader.getXBATCount(),
header_block_reader.getXBATIndex(),
data_blocks);
// get property table from the document
PropertyTable properties =
new PropertyTable(header_block_reader.getPropertyStart(),
data_blocks);
// init documents
processProperties(SmallBlockTableReader
.getSmallDocumentBlocks(data_blocks, properties
.getRoot(), header_block_reader
.getSBATStart()), data_blocks, properties.getRoot()
.getChildren(), null);
}
/**
* Create a new document to be added to the root directory
*
* @param stream the InputStream from which the document's data
* will be obtained
* @param name the name of the new POIFSDocument
*
* @return the new DocumentEntry
*
* @exception IOException on error creating the new POIFSDocument
*/
public DocumentEntry createDocument(final InputStream stream,
final String name)
throws IOException
{
return getRoot().createDocument(name, stream);
}
/**
* create a new DocumentEntry in the root entry; the data will be
* provided later
*
* @param name the name of the new DocumentEntry
* @param size the size of the new DocumentEntry
* @param writer the writer of the new DocumentEntry
*
* @return the new DocumentEntry
*
* @exception IOException
*/
public DocumentEntry createDocument(final String name, final int size,
final POIFSWriterListener writer)
throws IOException
{
return getRoot().createDocument(name, size, writer);
}
/**
* create a new DirectoryEntry in the root directory
*
* @param name the name of the new DirectoryEntry
*
* @return the new DirectoryEntry
*
* @exception IOException on name duplication
*/
public DirectoryEntry createDirectory(final String name)
throws IOException
{
return getRoot().createDirectory(name);
}
/**
* Write the filesystem out
*
* @param stream the OutputStream to which the filesystem will be
* written
*
* @exception IOException thrown on errors writing to the stream
*/
public void writeFilesystem(final OutputStream stream)
throws IOException
{
// get the property table ready
_property_table.preWrite();
// create the small block store, and the SBAT
SmallBlockTableWriter sbtw =
new SmallBlockTableWriter(_documents, _property_table.getRoot());
// create the block allocation table
BlockAllocationTableWriter bat =
new BlockAllocationTableWriter();
// create a list of BATManaged objects: the documents plus the
// property table and the small block table
List bm_objects = new ArrayList();
bm_objects.addAll(_documents);
bm_objects.add(_property_table);
bm_objects.add(sbtw);
bm_objects.add(sbtw.getSBAT());
// walk the list, allocating space for each and assigning each
// a starting block number
Iterator iter = bm_objects.iterator();
while (iter.hasNext())
{
BATManaged bmo = ( BATManaged ) iter.next();
int block_count = bmo.countBlocks();
if (block_count != 0)
{
bmo.setStartBlock(bat.allocateSpace(block_count));
}
else
{
// Either the BATManaged object is empty or its data
// is composed of SmallBlocks; in either case,
// allocating space in the BAT is inappropriate
}
}
// allocate space for the block allocation table and take its
// starting block
int batStartBlock = bat.createBlocks();
// get the extended block allocation table blocks
HeaderBlockWriter header_block_writer = new HeaderBlockWriter();
BATBlock[] xbat_blocks =
header_block_writer.setBATBlocks(bat.countBlocks(),
batStartBlock);
// set the property table start block
header_block_writer.setPropertyStart(_property_table.getStartBlock());
// set the small block allocation table start block
header_block_writer.setSBATStart(sbtw.getSBAT().getStartBlock());
// the header is now properly initialized. Make a list of
// writers (the header block, followed by the documents, the
// property table, the small block store, the small block
// allocation table, the block allocation table, and the
// extended block allocation table blocks)
List writers = new ArrayList();
writers.add(header_block_writer);
writers.addAll(_documents);
writers.add(_property_table);
writers.add(sbtw);
writers.add(sbtw.getSBAT());
writers.add(bat);
for (int j = 0; j < xbat_blocks.length; j++)
{
writers.add(xbat_blocks[ j ]);
}
// now, write everything out
iter = writers.iterator();
while (iter.hasNext())
{
BlockWritable writer = ( BlockWritable ) iter.next();
writer.writeBlocks(stream);
}
}
/**
* read in a file and write it back out again
*
* @param args names of the files; arg[ 0 ] is the input file,
* arg[ 1 ] is the output file
*
* @exception IOException
*/
public static void main(String args[])
throws IOException
{
if (args.length != 2)
{
System.err.println(
"two arguments required: input filename and output filename");
System.exit(1);
}
FileInputStream istream = new FileInputStream(args[ 0 ]);
FileOutputStream ostream = new FileOutputStream(args[ 1 ]);
new POIFSFileSystem(istream).writeFilesystem(ostream);
istream.close();
ostream.close();
}
/**
* get the root entry
*
* @return the root entry
*/
public DirectoryEntry getRoot()
{
if (_root == null)
{
_root = new DirectoryNode(_property_table.getRoot(), this, null);
}
return _root;
}
/**
* open a document in the root entry's list of entries
*
* @param documentName the name of the document to be opened
*
* @return a newly opened DocumentInputStream
*
* @exception IOException if the document does not exist or the
* name is that of a DirectoryEntry
*/
public DocumentInputStream createDocumentInputStream(
final String documentName)
throws IOException
{
Entry document = getRoot().getEntry(documentName);
if (!document.isDocumentEntry())
{
throw new IOException("Entry '" + documentName
+ "' is not a DocumentEntry");
}
return new DocumentInputStream(( DocumentEntry ) document);
}
/**
* add a new POIFSDocument
*
* @param document the POIFSDocument being added
*/
void addDocument(final POIFSDocument document)
{
_documents.add(document);
_property_table.addProperty(document.getDocumentProperty());
}
/**
* add a new DirectoryProperty
*
* @param directory the DirectoryProperty being added
*/
void addDirectory(final DirectoryProperty directory)
{
_property_table.addProperty(directory);
}
/**
* remove an entry
*
* @param entry to be removed
*/
void remove(EntryNode entry)
{
_property_table.removeProperty(entry.getProperty());
if (entry.isDocumentEntry())
{
_documents.remove((( DocumentNode ) entry).getDocument());
}
}
private void processProperties(final BlockList small_blocks,
final BlockList big_blocks,
final Iterator properties,
final DirectoryNode dir)
throws IOException
{
while (properties.hasNext())
{
Property property = ( Property ) properties.next();
String name = property.getName();
DirectoryNode parent = (dir == null)
? (( DirectoryNode ) getRoot())
: dir;
if (property.isDirectory())
{
DirectoryNode new_dir =
( DirectoryNode ) parent.createDirectory(name);
processProperties(
small_blocks, big_blocks,
(( DirectoryProperty ) property).getChildren(), new_dir);
}
else
{
int startBlock = property.getStartBlock();
int size = property.getSize();
POIFSDocument document = null;
if (property.shouldUseSmallBlocks())
{
document =
new POIFSDocument(name, small_blocks
.fetchBlocks(startBlock), size);
}
else
{
document =
new POIFSDocument(name,
big_blocks.fetchBlocks(startBlock),
size);
}
parent.createDocument(document);
}
}
}
/* ********** START begin implementation of POIFSViewable ********** */
/**
* Get an array of objects, some of which may implement
* POIFSViewable
*
* @return an array of Object; may not be null, but may be empty
*/
public Object [] getViewableArray()
{
if (preferArray())
{
return (( POIFSViewable ) getRoot()).getViewableArray();
}
else
{
return new Object[ 0 ];
}
}
/**
* Get an Iterator of objects, some of which may implement
* POIFSViewable
*
* @return an Iterator; may not be null, but may have an empty
* back end store
*/
public Iterator getViewableIterator()
{
if (!preferArray())
{
return (( POIFSViewable ) getRoot()).getViewableIterator();
}
else
{
return Collections.EMPTY_LIST.iterator();
}
}
/**
* Give viewers a hint as to whether to call getViewableArray or
* getViewableIterator
*
* @return true if a viewer should call getViewableArray, false if
* a viewer should call getViewableIterator
*/
public boolean preferArray()
{
return (( POIFSViewable ) getRoot()).preferArray();
}
/**
* Provides a short description of the object, to be used when a
* POIFSViewable object has not provided its contents.
*
* @return short description
*/
public String getShortDescription()
{
return "POIFS FileSystem";
}
/* ********** END begin implementation of POIFSViewable ********** */
} // end public class POIFSFileSystem