First stab at hdgf, an implementation of the visio format. Basic support for processing the equivalent of records - pointers and blocks. Now to refactor it into something sane!
git-svn-id: https://svn.apache.org/repos/asf/jakarta/poi/trunk@548428 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Nick Burch
parent
12cb6d67f6
commit
2d22286924
287
src/scratchpad/src/org/apache/poi/hdgf/HDGFDiagram.java
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287
src/scratchpad/src/org/apache/poi/hdgf/HDGFDiagram.java
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/* ====================================================================
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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==================================================================== */
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package org.apache.poi.hdgf;
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import java.io.ByteArrayInputStream;
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import java.io.FileInputStream;
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import java.io.IOException;
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import org.apache.poi.poifs.filesystem.DocumentEntry;
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import org.apache.poi.poifs.filesystem.POIFSFileSystem;
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import org.apache.poi.util.LittleEndian;
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/**
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* See
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* http://www.redferni.uklinux.net/visio/
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* http://www.gnome.ru/projects/docs/vsdocs.html
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* http://www.gnome.ru/projects/docs/slide1.png
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* http://www.gnome.ru/projects/docs/slide2.png
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*/
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public class HDGFDiagram {
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private static final String VISIO_HEADER = "Visio (TM) Drawing\r\n";
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private POIFSFileSystem filesystem;
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private byte[] _docstream;
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private short version;
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private long docSize;
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private VisioPointer trailerPointer;
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private PointerBlock trailer;
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public HDGFDiagram(POIFSFileSystem fs) throws IOException {
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filesystem = fs;
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DocumentEntry docProps =
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(DocumentEntry)filesystem.getRoot().getEntry("VisioDocument");
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// Grab the document stream
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_docstream = new byte[docProps.getSize()];
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filesystem.createDocumentInputStream("VisioDocument").read(_docstream);
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// Check it's really visio
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String typeString = new String(_docstream, 0, 20);
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if(! typeString.equals(VISIO_HEADER)) {
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throw new IllegalArgumentException("Wasn't a valid visio document, started with " + typeString);
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}
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// Grab the version number, 0x1a -> 0x1b
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version = LittleEndian.getShort(_docstream, 0x1a);
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// Grab the document size, 0x1c -> 0x1f
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docSize = LittleEndian.getUInt(_docstream, 0x1c);
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// ??? 0x20 -> 0x23
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// Grab the pointer to the trailer
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trailerPointer = VisioPointer.getPointerAt(_docstream, 0x24);
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// And now grab the trailer
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trailer = new CompressedPointerBlock(trailerPointer, _docstream);
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}
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public void debug() throws IOException {
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System.err.println("Trailer is at " + trailerPointer.offset);
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System.err.println("Trailer has type " + trailerPointer.type);
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System.err.println("Trailer has length " + trailerPointer.length);
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System.err.println("Trailer has format " + trailerPointer.format);
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for(int i=0; i<trailer.getPointers().length; i++) {
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VisioPointer ptr = trailer.getPointers()[i];
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System.err.println("Looking at pointer " + i);
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System.err.println("\tType is " + ptr.type + "\t\t" + Integer.toHexString(ptr.type));
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System.err.println("\tOffset is " + ptr.offset + "\t\t" + Long.toHexString(ptr.offset));
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System.err.println("\tAddress is " + ptr.address + "\t" + Long.toHexString(ptr.address));
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System.err.println("\tLength is " + ptr.length + "\t\t" + Long.toHexString(ptr.length));
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System.err.println("\tFormat is " + ptr.format + "\t\t" + Long.toHexString(ptr.format));
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System.err.println("\tCompressed is " + ptr.destinationCompressed());
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if(ptr.destinationHasPointers()) {
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PointerBlock pb = PointerBlock.createAppropriateBlock(ptr, _docstream);
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if(pb.getPointers() != null && pb.getPointers().length > 0) {
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System.err.println("\tContains " + pb.getPointers().length + " other pointers");
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for(int j=0; j<pb.getPointers().length; j++) {
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VisioPointer sptr = pb.getPointers()[j];
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System.err.println("\t\t" + j + " - Type is " + sptr.type + "\t\t" + Integer.toHexString(sptr.type));
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System.err.println("\t\t" + j + " - Length is " + sptr.length + "\t\t" + Long.toHexString(sptr.length));
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}
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}
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}
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if(ptr.destinationHasStrings()) {
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System.err.println("**strings**");
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PointerBlock pb = PointerBlock.createAppropriateBlock(ptr, _docstream);
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System.err.println(pb.contents.length);
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}
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}
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}
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/**
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* Will only work on Test_Visio-Some_Random_Text.vsd !
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*/
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public void debugTestFile() throws Exception {
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System.err.println();
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VisioPointer p61ee = trailer.pointers[8];
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System.err.println(p61ee.type + " " + Integer.toHexString(p61ee.type));
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PointerBlock pb61ee = PointerBlock.createAppropriateBlock(p61ee, _docstream);
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VisioPointer p4524 = pb61ee.pointers[4];
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System.err.println(p4524.type + " " + Integer.toHexString(p4524.type));
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PointerBlock pb4524 = PointerBlock.createAppropriateBlock(p4524, _docstream);
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VisioPointer p44d3 = pb4524.pointers[5];
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System.err.println(p44d3.type + " " + Integer.toHexString(p44d3.type));
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PointerBlock pb44d3 = PointerBlock.createAppropriateBlock(p44d3, _docstream);
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VisioPointer p4312 = pb44d3.pointers[1];
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System.err.println(p4312.type + " " + Integer.toHexString(p4312.type));
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PointerBlock pb4312 = PointerBlock.createAppropriateBlock(p4312, _docstream);
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VisioPointer p347f = pb4312.pointers[0];
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System.err.println();
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System.err.println(p347f.type + " " + Integer.toHexString(p347f.type));
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System.err.println(p347f.offset + " " + Long.toHexString(p347f.offset));
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System.err.println(p347f.length + " " + Long.toHexString(p347f.length));
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System.err.println("Has Strings - " + p347f.destinationHasStrings());
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System.err.println("Compressed - " + p347f.destinationCompressed());
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PointerBlock pb347f = PointerBlock.createAppropriateBlock(p347f, _docstream);
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}
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/**
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* For testing only
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*/
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public static void main(String args[]) throws Exception {
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HDGFDiagram hdgf = new HDGFDiagram(new POIFSFileSystem(new FileInputStream(args[0])));
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hdgf.debug();
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hdgf.debugTestFile();
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}
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/**
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* A block containing lots of pointers to other blocks.
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*/
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public static class PointerBlock {
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protected VisioPointer pointer;
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private byte[] contents;
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protected VisioPointer[] pointers;
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protected PointerBlock(VisioPointer pointer) {
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this.pointer = pointer;
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}
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protected PointerBlock(VisioPointer pointer, byte[] data) {
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this(pointer);
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processData(data, (int)pointer.offset, (int)pointer.length);
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}
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protected static PointerBlock createAppropriateBlock(VisioPointer pointer, byte[] data) throws IOException {
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if(pointer.destinationCompressed()) {
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return new CompressedPointerBlock(pointer,data);
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} else {
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return new PointerBlock(pointer,data);
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}
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}
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public VisioPointer[] getPointers() { return pointers; }
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/**
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* Splits the data up into header + contents, and processes
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*/
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protected void processData(byte[] data, int offset, int len) {
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if(len > data.length - offset) {
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len = data.length - offset;
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}
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if(offset < 0) { len = 0; }
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contents = new byte[len];
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if(len > 0)
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System.arraycopy(data, offset, contents, 0, contents.length);
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// If we're of type 20, we have child pointers
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if(len > 0 && (pointer.type == 20 || pointer.destinationHasPointers())) {
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// Grab the offset to the number of pointers
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int nPointersAt = (int)LittleEndian.getUInt(contents, 0);
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int numPointers = (int)LittleEndian.getUInt(contents, nPointersAt);
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int unknownA = (int)LittleEndian.getUInt(contents, nPointersAt+4);
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pointers = new VisioPointer[numPointers];
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int pos = nPointersAt + 8;
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for(int i=0; i<numPointers; i++) {
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pointers[i] = VisioPointer.getPointerAt(contents, pos);
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pos += 18;
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}
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}
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// If we have strings, try to make sense of them
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if(len > 0 && (pointer.destinationHasStrings())) {
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for(int i=0; i<64; i+=1) {
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short s = LittleEndian.getShort(contents, i);
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long l = LittleEndian.getUInt(contents, i);
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System.err.println(i + "\t" + s + "\t" + Integer.toHexString(s));
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System.err.println(i + "\t" + l + "\t" + Long.toHexString(l));
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}
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}
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}
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}
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/**
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* A block containing lots of pointers to other blocks, that
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* is itself compressed
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*/
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public static class CompressedPointerBlock extends PointerBlock {
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protected byte[] compressedContents;
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private byte[] blockHeader = new byte[4];
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protected CompressedPointerBlock(VisioPointer pointer, byte[] data) throws IOException {
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super(pointer);
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compressedContents = new byte[(int)pointer.length];
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System.arraycopy(data, (int)pointer.offset, compressedContents, 0, compressedContents.length);
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// Decompress
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ByteArrayInputStream bais = new ByteArrayInputStream(compressedContents);
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// TIFFLZWDecoder lzw = new TIFFLZWDecoder();
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// byte[] out = new byte[4096];
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// contents = lzw.decode(compressedContents, out);
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LZW4HDGF lzw = new LZW4HDGF();
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byte[] decomp = lzw.decode(bais);
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System.arraycopy(decomp, 0, blockHeader, 0, 4);
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processData(decomp, 4, decomp.length-4);
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}
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}
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/**
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* A visio pointer, for visio versions 6+
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*/
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public static class VisioPointer {
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private int type;
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private long address;
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private long offset;
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private long length;
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private short format;
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public boolean destinationHasStrings() {
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return (0x40 <= format && format < 0x50);
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}
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public boolean destinationHasPointers() {
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if(format == 0x1d || format == 0x1e) return true;
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return (0x50 <= format && format < 0x60);
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}
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public boolean destinationHasChunks() {
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return (0xd0 <= format && format < 0xd0);
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}
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public boolean destinationCompressed() {
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// Apparently, it's the second least significant bit
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return (format & 2) > 0;
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}
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public static VisioPointer getPointerAt(byte[] data, int offset) {
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VisioPointer p = new VisioPointer();
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p.type = LittleEndian.getInt(data, offset+0);
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p.address = LittleEndian.getUInt(data, offset+4);
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p.offset = LittleEndian.getUInt(data, offset+8);
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p.length = LittleEndian.getUInt(data, offset+12);
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p.format = LittleEndian.getShort(data, offset+16);
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return p;
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}
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}
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}
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80
src/scratchpad/src/org/apache/poi/hdgf/LZW4HDGF.java
Normal file
80
src/scratchpad/src/org/apache/poi/hdgf/LZW4HDGF.java
Normal file
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/**
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 3 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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package org.apache.poi.hdgf;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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/**
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* A decoder for the crazy LZW implementation used
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* in Visio.
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* This is a port of vsd_inflate.c from vsdump
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* (http://www.gnome.ru/projects/vsdump_en.html)
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*/
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public class LZW4HDGF {
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public byte fromInt(int b) {
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if(b < 128) return (byte)b;
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return (byte)(b - 256);
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}
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public byte[] decode(InputStream src) throws IOException {
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ByteArrayOutputStream res = new ByteArrayOutputStream();
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int pos = 0;
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int flag;
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byte[] buffer = new byte[4096];
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buffer[0] = 0;
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byte data;
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int tmp;
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int addr1, addr2;
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int len, pntr;
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while ( (flag = src.read()) != -1 ) {
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for (int mask = 1; mask < 0x100 ; mask <<= 1) {
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if ( (flag & mask) > 0) {
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if( (tmp = src.read()) != -1) {
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buffer[(pos&4095)] = fromInt(tmp);
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pos++;
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res.write( new byte[] {fromInt(tmp)} );
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}
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} else {
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tmp = src.read();
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if(tmp == -1) break;
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addr1 = tmp;
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tmp = src.read();
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if(tmp == -1) break;
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addr2 = tmp;
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len = (addr2 & 15) + 3;
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pntr = (addr2 & 240)*16 + addr1;
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if(pntr > 4078) {
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pntr = pntr - 4078;
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} else {
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pntr = pntr + 18;
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}
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for(int i=0; i<len; i++) {
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buffer [(pos + i) & 4095] = buffer [(pntr + i) & 4095];
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data = buffer[(pntr + i ) & 4095];
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res.write(new byte[] {data});
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}
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pos = pos + len;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
return res.toByteArray();
|
||||||
|
}
|
||||||
|
}
|
||||||
101
src/scratchpad/testcases/org/apache/poi/hdgf/TestLZW4HDGF.java
Normal file
101
src/scratchpad/testcases/org/apache/poi/hdgf/TestLZW4HDGF.java
Normal file
@ -0,0 +1,101 @@
|
|||||||
|
/* ====================================================================
|
||||||
|
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.ByteArrayInputStream;
|
||||||
|
|
||||||
|
import junit.framework.TestCase;
|
||||||
|
|
||||||
|
public class TestLZW4HDGF extends TestCase {
|
||||||
|
public static final byte[] testTrailerComp = new byte[] {
|
||||||
|
123, -60, 2, -21, -16, 1, 0, 0, -72, -13, -16, 78, -32, -5, 1,
|
||||||
|
0, 3, -21, -16, 10, 5, 4, -21, -16, 21, 9, -21, -16, 103, -21,
|
||||||
|
-16, 34, -36, -1, 52, 15, 70, 15, 120, 88, 15, -7, -2, -28, -9,
|
||||||
|
-123, 21, 0, 44, -122, 1, -4, 104, 15, -24, -13, 40, -98, 32,
|
||||||
|
78, 102, -67, -1, -2, -30, 64, 40, -67, -113, -73, 116, -98,
|
||||||
|
-85, 2, 66, 123, 9, 109, -85, 2, -89, 14, -56, -69, -83, -79,
|
||||||
|
-34, -3, 120, 110, 75, -9, -10, 20, -6, -25, -12, 22, -21, -16,
|
||||||
|
-12, -81, 67, 1, -128, -70, -21, -16, 84, -21, -16, 70, 0, 23,
|
||||||
|
-21, -16, 76, 47, -40, 79, 1, -44, -21, -16, 32, 3, 18, 12, 17,
|
||||||
|
-43, -68, 17, 16, -8, 21, 22, -1, -21, -16, -84, -1, -35, 79,
|
||||||
|
-9, -10, 96, 0, 46, -21, -16, 44, -39, -41, 79, 1, 119, -13,
|
||||||
|
-16, -106, -13, -16, 84, 0, 125, 26, -21, -16, 68, -38, 79, 1,
|
||||||
|
17, 10, 0, -97, 50, 10, 0, 0, -42, -108, 15, 118, 31, 0, -3, 29,
|
||||||
|
-21, -16, -100, -25, 79, 1, -18, 97, -36, 76, 16, -21, -16, 86,
|
||||||
|
0, 36, -5, 1, -5, 79, 63, 1, -124, 98, 0, 0, 28, 3, 20, -34, -3,
|
||||||
|
125, 33, -21, -16, 100, -4, 79, 1, -92, -91, 16, -22, 24, 19, 41,
|
||||||
|
-21, -16, -44, -59, 16, 108, 100, 0, -21, 0, 71, -105, 18, 39, 85,
|
||||||
|
17, -3, 79, 1, 95, -108, 113, 0, 0, 104, 3, 18, 49, 49, 17, -1, 64,
|
||||||
|
85, 1, 0, 114, 0, 0, -93, -36, -21, -16, 100, 31, 0, 0, -40, -21,
|
||||||
|
-16, -92, 66, 127, 85, 1, 98, 119, 0, 0, -48, 79, 18, -3, 50, -17,
|
||||||
|
1, 67, 85, 1, 81, -127, 0, -41, 0, 14, 6, 4, 17, 63, -63, 17, 68,
|
||||||
|
85, -65, 1, 30, -120, 0, 0, 42, 79, 18, 68, 126, -21, -16, -76, 69,
|
||||||
|
85, 1, 102, -119, 72, 37, 0, 97, 33 };
|
||||||
|
public static final byte[] testTrailerDecomp = new byte[] {
|
||||||
|
-60, 2, 0, 0, 0, 1, 0, 0, -72, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||||
|
0, 0, 0, 0, 0, 1, 0, 3, 0, 0, 0, 3, 0, 0, 0, 3, 0, 0, 0, 4, 0, 0,
|
||||||
|
0, 9, 0, 0, 0, 103, 0, 0, 0, 34, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||||
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||||
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||||
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||||
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||||
|
-123, 21, 0, 44, -123, 21, 0, 44, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||||
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 40, -98, 32, 78, 102, -67,
|
||||||
|
-2, -30, 64, 40, -67, -113, -73, 116, -67, -2, -30, 64, 40, 66,
|
||||||
|
123, 9, 109, -67, -2, -30, 64, 40, -98, 32, 78, 102, -67, -2, -30,
|
||||||
|
64, 40, -67, -113, -73, 116, -67, -2, -30, 64, -56, -83, -79, 0, 0,
|
||||||
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 120, 110, 75, 1, 0, 0, 0,
|
||||||
|
0, 0, 0, 0, 0, 20, 0, 0, 0, 0, 0, 0, 0, 22, 0, 0, 0, -12, -81, 67,
|
||||||
|
1, -128, 0, 0, 0, 84, 0, 0, 0, 70, 0, 23, 0, 0, 0, 76, -40, 79, 1,
|
||||||
|
-44, 0, 0, 0, 32, 0, 0, 0, 84, 0, 23, 0, 0, 0, -68, -40, 79, 1, -8,
|
||||||
|
0, 0, 0, 32, 0, 0, 0, 84, 0, -1, 0, 0, 0, -84, -1, 79, 1, 0, 0, 0,
|
||||||
|
0, 0, 0, 0, 0, 96, 0, 46, 0, 0, 0, 44, -39, 79, 1, 119, 1, 0, 0,
|
||||||
|
-106, 1, 0, 0, 84, 0, 26, 0, 0, 0, 68, -38, 79, 1, 17, 3, 0, 0,
|
||||||
|
50, 10, 0, 0, -42, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||||
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||||
|
29, 0, 0, 0, -100, -25, 79, 1, -18, 97, 0, 0, -106, 0, 0, 0, 86, 0,
|
||||||
|
36, 0, 0, 0, -12, -5, 79, 1, -124, 98, 0, 0, 28, 0, 0, 0, 84, 0, 0,
|
||||||
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 33, 0, 0, 0, 100,
|
||||||
|
-4, 79, 1, -92, 98, 0, 0, 32, 0, 0, 0, 84, 0, 41, 0, 0, 0, -44, -4,
|
||||||
|
79, 1, 108, 100, 0, 0, 71, 0, 0, 0, 86, 0, 39, 0, 0, 0, 68, -3, 79,
|
||||||
|
1, -108, 113, 0, 0, 104, 0, 0, 0, 84, 0, 49, 0, 0, 0, -84, 64, 85,
|
||||||
|
1, 0, 114, 0, 0, -93, 0, 0, 0, -42, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||||
|
0, 0, 0, 0, 0, 0, 0, 0, 0, -40, 0, 0, 0, -92, 66, 85, 1, 98, 119,
|
||||||
|
0, 0, -48, 1, 0, 0, 84, 0, 50, 0, 0, 0, 20, 67, 85, 1, 81, -127,
|
||||||
|
0, 0, 14, 6, 0, 0, 84, 0, 63, 0, 0, 0, 100, 68, 85, 1, 30, -120,
|
||||||
|
0, 0, 42, 1, 0, 0, 84, 0, 68, 0, 0, 0, -76, 69, 85, 1, 102, -119,
|
||||||
|
0, 0, 42, 1, 0, 0, 84, 0, 0, 0, 0, 0
|
||||||
|
};
|
||||||
|
|
||||||
|
public void testCounts() throws Exception {
|
||||||
|
assertEquals(339, testTrailerComp.length);
|
||||||
|
assertEquals(632, testTrailerDecomp.length);
|
||||||
|
|
||||||
|
// Decode it using our engine
|
||||||
|
LZW4HDGF lzw2 = new LZW4HDGF();
|
||||||
|
byte[] dec = lzw2.decode(new ByteArrayInputStream(testTrailerComp));
|
||||||
|
|
||||||
|
// Check it's of the right size
|
||||||
|
assertEquals(632, dec.length);
|
||||||
|
|
||||||
|
// Now check it matches
|
||||||
|
for(int i=0; i<dec.length; i++) {
|
||||||
|
if(dec[i] != testTrailerDecomp[i])
|
||||||
|
System.err.println(i + "\t" + dec[i] + "\t" + testTrailerDecomp[i]);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
Loading…
Reference in New Issue
Block a user