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/* ====================================================================
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.hslf.dev;
import java.io.*;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import org.apache.poi.poifs.filesystem.DocumentEntry;
import org.apache.poi.ddf.*;
import org.apache.poi.hslf.record.RecordTypes;
import org.apache.poi.util.LittleEndian;
/**
* This class provides a way to "peek" inside a powerpoint file. It
* will print out all the types it find, and for those it know aren't
* atoms, what they contain
*
* To figure out what things are, and if they are atoms or not, used the
* list in hslf.record.RecordTypes
*
* To peek inside PPDrawings, which hold Escher drawings, we use the
* DDF package from POI (but we can fake it by using the Escher listings
* from hslf.record.RecordTypes also)
*
* @author Nick Burch
*/
public final class SlideShowDumper {
private InputStream istream;
private POIFSFileSystem filesystem;
private byte[] _docstream;
/** Do we try to use DDF to understand the escher objects? */
private boolean ddfEscher = false;
/** Do we use our own built-in basic escher groker to understand the escher objects? */
private boolean basicEscher = false;
/**
* right now this function takes one parameter: a ppt file, and outputs
* a dump of what it contains
*/
public static void main(String args[]) throws IOException
{
if(args.length == 0) {
System.err.println("Useage: SlideShowDumper [-escher|-basicescher] ");
return;
}
String filename = args[0];
if(args.length > 1) {
filename = args[1];
}
SlideShowDumper foo = new SlideShowDumper(filename);
if(args.length > 1) {
if(args[0].equalsIgnoreCase("-escher")) {
foo.setDDFEscher(true);
} else {
foo.setBasicEscher(true);
}
}
foo.printDump();
foo.close();
}
/**
* Constructs a Powerpoint dump from fileName. Parses the document
* and dumps out the contents
*
* @param fileName The name of the file to read.
* @throws IOException if there is a problem while parsing the document.
*/
public SlideShowDumper(String fileName) throws IOException
{
this(new FileInputStream(fileName));
}
/**
* Constructs a Powerpoint dump from an input stream. Parses the
* document and dumps out the contents
*
* @param inputStream the source of the data
* @throws IOException if there is a problem while parsing the document.
*/
public SlideShowDumper(InputStream inputStream) throws IOException
{
//do Ole stuff
this(new POIFSFileSystem(inputStream));
istream = inputStream;
}
/**
* Constructs a Powerpoint dump from a POIFS Filesystem. Parses the
* document and dumps out the contents
*
* @param filesystem the POIFS FileSystem to read from
* @throws IOException if there is a problem while parsing the document.
*/
public SlideShowDumper(POIFSFileSystem filesystem) throws IOException
{
this.filesystem = filesystem;
// Get the main document stream
DocumentEntry docProps =
(DocumentEntry)filesystem.getRoot().getEntry("PowerPoint Document");
// Grab the document stream
_docstream = new byte[docProps.getSize()];
filesystem.createDocumentInputStream("PowerPoint Document").read(_docstream);
}
/**
* Control dumping of any Escher records found - should DDF be used?
*/
public void setDDFEscher(boolean grok) {
ddfEscher = grok;
basicEscher = !(grok);
}
/**
* Control dumping of any Escher records found - should our built in
* basic groker be used?
*/
public void setBasicEscher(boolean grok) {
basicEscher = grok;
ddfEscher = !(grok);
}
/**
* Shuts things down. Closes underlying streams etc
*
* @throws IOException
*/
public void close() throws IOException
{
if(istream != null) {
istream.close();
}
filesystem = null;
}
public void printDump() {
// The format of records in a powerpoint file are:
//
//
//
// If it has a zero length, following it will be another record
//
// If it has a length, depending on its type it may have children or data
// If it has children, these will follow straight away
// >
// If it has data, this will come straigh after, and run for the length
//
// All lengths given exclude the 8 byte record header
// (Data records are known as Atoms)
// Document should start with:
// 0F 00 E8 03 ## ## ## ##
// (type 1000 = document, info 00 0f is normal, rest is document length)
// 01 00 E9 03 28 00 00 00
// (type 1001 = document atom, info 00 01 normal, 28 bytes long)
// When parsing a document, look to see if you know about that type
// of the current record. If you know it's a type that has children,
// process the record's data area looking for more records
// If you know about the type and it doesn't have children, either do
// something with the data (eg TextRun) or skip over it
// Otherwise, check the first byte. If you do a BINARY_AND on it with
// 0x0f (15) and get back 0x0f, you know it has children. Otherwise
// it doesn't
walkTree(0,0,_docstream.length);
}
public String makeHex(short s) {
String hex = Integer.toHexString(s).toUpperCase();
if(hex.length() == 1) { return "0" + hex; }
return hex;
}
public String makeHex(int i) {
String hex = Integer.toHexString(i).toUpperCase();
if(hex.length() == 1) { return "000" + hex; }
if(hex.length() == 2) { return "00" + hex; }
if(hex.length() == 3) { return "0" + hex; }
return hex;
}
public void walkTree(int depth, int startPos, int maxLen) {
int pos = startPos;
int endPos = startPos + maxLen;
int indent = depth;
while(pos <= endPos - 8) {
long type = LittleEndian.getUShort(_docstream,pos+2);
long len = LittleEndian.getUInt(_docstream,pos+4);
byte opt = _docstream[pos];
String ind = "";
for(int i=0; i 8 ) {
// Assume it has children, rather than being corrupted
walkEscherDDF((indent+3), pos + 8, (int)atomLen );
// Wind on our length + our header
pos += atomLen;
pos += 8;
len -= atomLen;
len -= 8;
} else {
// No children, wind on our real length
pos += atomLen;
pos += 8;
len -= atomLen;
len -= 8;
}
// Move on to the next one, if we're not at the end yet
if(len >= 8) {
walkEscherDDF(indent, pos, len );
}
}
/**
* Use the basic record format groking code to walk the Escher records
*/
public void walkEscherBasic(int indent, int pos, int len) {
if(len < 8) { return; }
String ind = "";
for(int i=0; i © 2015 - 2024 Weber Informatics LLC | Privacy Policy