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xylophone - LGPL Java library
/* ====================================================================
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.hdgf;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import org.apache.poi.POIReadOnlyDocument;
import org.apache.poi.hdgf.chunks.ChunkFactory;
import org.apache.poi.hdgf.pointers.Pointer;
import org.apache.poi.hdgf.pointers.PointerFactory;
import org.apache.poi.hdgf.streams.PointerContainingStream;
import org.apache.poi.hdgf.streams.Stream;
import org.apache.poi.hdgf.streams.StringsStream;
import org.apache.poi.hdgf.streams.TrailerStream;
import org.apache.poi.poifs.filesystem.DirectoryNode;
import org.apache.poi.poifs.filesystem.NPOIFSFileSystem;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import org.apache.poi.util.IOUtils;
import org.apache.poi.util.LittleEndian;
import org.apache.poi.util.LocaleUtil;
/**
* See
* http://www.redferni.uklinux.net/visio/
* http://www.gnome.ru/projects/docs/vsdocs.html
* http://www.gnome.ru/projects/docs/slide1.png
* http://www.gnome.ru/projects/docs/slide2.png
*/
public final class HDGFDiagram extends POIReadOnlyDocument {
private static final String VISIO_HEADER = "Visio (TM) Drawing\r\n";
private byte[] _docstream;
private short version;
private long docSize;
private Pointer trailerPointer;
private TrailerStream trailer;
private ChunkFactory chunkFactory;
private PointerFactory ptrFactory;
public HDGFDiagram(POIFSFileSystem fs) throws IOException {
this(fs.getRoot());
}
public HDGFDiagram(NPOIFSFileSystem fs) throws IOException {
this(fs.getRoot());
}
public HDGFDiagram(DirectoryNode dir) throws IOException {
super(dir);
// Grab the document stream
InputStream is = dir.createDocumentInputStream("VisioDocument");
_docstream = IOUtils.toByteArray(is);
is.close();
// Check it's really visio
String typeString = new String(_docstream, 0, 20, LocaleUtil.CHARSET_1252 );
if(! typeString.equals(VISIO_HEADER)) {
throw new IllegalArgumentException("Wasn't a valid visio document, started with " + typeString);
}
// Grab the version number, 0x1a -> 0x1b
version = LittleEndian.getShort(_docstream, 0x1a);
// Grab the document size, 0x1c -> 0x1f
docSize = LittleEndian.getUInt(_docstream, 0x1c);
// ??? 0x20 -> 0x23
// Create the Chunk+Pointer Factories for the document version
ptrFactory = new PointerFactory(version);
chunkFactory = new ChunkFactory(version);
// Grab the pointer to the trailer
trailerPointer = ptrFactory.createPointer(_docstream, 0x24);
// Now grab the trailer
trailer = (TrailerStream)
Stream.createStream(trailerPointer, _docstream, chunkFactory, ptrFactory);
// Finally, find all our streams
trailer.findChildren(_docstream);
}
/**
* Returns the TrailerStream, which is at the root of the
* tree of Streams.
*/
public TrailerStream getTrailerStream() { return trailer; }
/**
* Returns all the top level streams, which are the streams
* pointed to by the TrailerStream.
*/
public Stream[] getTopLevelStreams() { return trailer.getPointedToStreams(); }
public long getDocumentSize() { return docSize; }
/**
* Prints out some simple debug on the base contents of the file.
* @see org.apache.poi.hdgf.dev.VSDDumper
*/
public void debug() {
System.err.println("Trailer is at " + trailerPointer.getOffset());
System.err.println("Trailer has type " + trailerPointer.getType());
System.err.println("Trailer has length " + trailerPointer.getLength());
System.err.println("Trailer has format " + trailerPointer.getFormat());
for(int i=0; i 0) {
System.err.println("\tContains " + pcs.getPointedToStreams().length + " other pointers/streams");
for(int j=0; j