Big update of jode documentation

git-svn-id: https://svn.code.sf.net/p/jode/code/trunk@1169 379699f6-c40d-0410-875b-85095c16579e
branch_1_1
jochen 25 years ago
parent 7e6a592c69
commit cf5477df8a
  1. 11
      jode/doc/Makefile.am
  2. 95
      jode/doc/applet.html
  3. 95
      jode/doc/applet.html.in
  4. 87
      jode/doc/download.html.in
  5. 59
      jode/doc/history.html
  6. 39
      jode/doc/jode-applet.html
  7. BIN
      jode/doc/jode-logo.gif
  8. 15
      jode/doc/jode-obfuscator.html
  9. 97
      jode/doc/jode-unix.html
  10. 49
      jode/doc/jode-useapplet.html
  11. 62
      jode/doc/jode-win.html
  12. 166
      jode/doc/jode.html
  13. 530
      jode/doc/license.html
  14. 28
      jode/doc/myproject.jos
  15. 201
      jode/doc/usage.html

@ -1,5 +1,12 @@
## Input file for automake to generate the Makefile.in used by configure ## Input file for automake to generate the Makefile.in used by configure
EXTRA_DIST = \ EXTRA_DIST = \
jode.html jode-applet.html jode-obfuscator.html jode-unix.html \ applet.html.in \
jode-useapplet.html jode-win.html download.html.in \
frame.html \
history.html \
jode.html \
license.html \
usage.html \
myproject.jos \
jode-logo.gif

@ -0,0 +1,95 @@
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 3.0//EN">
<html>
<head>
<title>Java Optimize and Decompile Environment (JODE)</title>
<meta name="robots" content="noindex">
<meta name="date" content="1999-10-24">
</head>
<body>
<table cellpadding=4 cellspacing=1 width=100%>
<tr>
<td></td>
<td> <img src="jode-logo.gif" alt="JODE" width=286 height=110></td>
</tr>
<tr>
<td valign="top">
<B><a href="http://www.informatik.uni-oldenburg.de/~delwi">Homepage</a></B>
<br><br>
<a href="jode.html">
<B>Jode</B></a>
<ul>
<li>Test It Online</li>
<li><a href="download.html">Download</a></li>
<li><a href="usage.html">Usage</a></li>
<li><a href="license.html">License</a></li>
<li><a href="history.html">History</a></li>
</ul>
</td>
<td>
<h1>The <i>JODE</i> Applet</h1>
<applet code="jode/JodeApplet.class" archive="jode-applet.jar" width=540 height=400>
<param name=classpath
value="http://www.informatik.uni-oldenburg.de/~mw/plasma.jar">
<param name=class value="PlasmaApplet">
</applet><br><br>http://www.informatik.uni-oldenburg.de
Press the start button to decompile <a
href="http://www.informatik.uni-oldenburg.de/~mw/">Michael</a>'s <a
href="http://www.informatik.uni-oldenburg.de/~mw/plasma">Plasma
applet</a>. You may change the classpath and class name to point to a
class file of your choice. But note that most browsers doesn't allow
loading files from a different server.<br><br>
Save probably doesn't work, because it is forbidden by the browser.<br><br>
You may give multiple entries in the class path field separated by a
comma. The components may be local or remote zip or jar files or
directories. Note that browsers forbid accesses to different hosts or
local files that are not in a subdirectory of the applet
directory.<br><br>
<h1>Removing security restrictions with Internet Explorer</h1>
<p>This information was submitted by <a
href="mailto:PopescuM@health.missouri.edu">Mihail Popescu
<PopescuM@health.missouri.edu></a>. Please note that this will
<i>give all applets on our web server full access to your computer</i>,
so use it at your own risk.</p>
<p>Go to the View/Internet Options... dialog<br>
Select the "Security" tab</p>
<ul>
<li>Set "Zone:" to "Trusted sites zone"</li>
<li>Click "Add Sites..."
<ul><li>Add http://www.informatik.uni-oldenburg.de</li>
<li>Uncheck "Requires server verificaton..."</li>
<li>Click "OK"</li>
</ul></li>
<li>Check "Custom (for expert users)"</li>
<li>Click "Settings..."
<ul><li>Under Java/Java permissions, check "Custom"</li>
<li>Click "Java Custom Settings"
<ul><li>Select "Edit Permissions" tab</li>
<li>Under "Unsigned Content"/"Run Unsigned Content", make sure
"Run in sandbox" is checked and then check all the "Enable"
buttons under "Additional Unsigned Permissions"</li>
<li>Click "OK"</li>
</ul></li>
<li>Click "OK"</li>
</ul></li>
<li>Click "OK"</li>
</ul>
</td>
</table>
<hr>
<p><A HREF="mailto:Jochen.Hoenicke@Informatik.Uni-Oldenburg.DE">
http://www.informatik.uni-oldenburg.de/~delwi/jode/applet.html</A>, last
updated on <em>24-Okt-1999</em>.</p>
</body>
</html>

@ -0,0 +1,95 @@
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 3.0//EN">
<html>
<head>
<title>Java Optimize and Decompile Environment (JODE)</title>
<meta name="robots" content="noindex">
<meta name="date" content="1999-10-24">
</head>
<body>
<table cellpadding=4 cellspacing=1 width=100%>
<tr>
<td></td>
<td> <img src="jode-logo.gif" alt="JODE" width=286 height=110></td>
</tr>
<tr>
<td valign="top">
<B><a href="http://www.informatik.uni-oldenburg.de/~delwi">Homepage</a></B>
<br><br>
<a href="jode.html">
<B>Jode</B></a>
<ul>
<li>Test It Online</li>
<li><a href="download.html">Download</a></li>
<li><a href="usage.html">Usage</a></li>
<li><a href="license.html">License</a></li>
<li><a href="history.html">History</a></li>
</ul>
</td>
<td>
<h1>The <i>JODE</i> Applet</h1>
<applet code="jode/JodeApplet.class" archive="jode-applet.jar" width=540 height=400>
<param name=classpath
value="http://www.informatik.uni-oldenburg.de/~mw/plasma.jar">
<param name=class value="PlasmaApplet">
</applet><br><br>http://www.informatik.uni-oldenburg.de
Press the start button to decompile <a
href="http://www.informatik.uni-oldenburg.de/~mw/">Michael</a>'s <a
href="http://www.informatik.uni-oldenburg.de/~mw/plasma">Plasma
applet</a>. You may change the classpath and class name to point to a
class file of your choice. But note that most browsers doesn't allow
loading files from a different server.<br><br>
Save probably doesn't work, because it is forbidden by the browser.<br><br>
You may give multiple entries in the class path field separated by a
comma. The components may be local or remote zip or jar files or
directories. Note that browsers forbid accesses to different hosts or
local files that are not in a subdirectory of the applet
directory.<br><br>
<h1>Removing security restrictions under Internet Explorer</h1>
<p>This information was submitted by <a
href="mailto:PopescuM@health.missouri.edu">Mihail Popescu
<PopescuM@health.missouri.edu></a>. Please note that this will
<i>give all applets on our web server full access to your computer</i>,
so use it at your own risk.</p>
<p>Go to the View/Internet Options... dialog<br>
Select the "Security" tab</p>
<ul>
<li>Set "Zone:" to "Trusted sites zone"</li>
<li>Click "Add Sites..."
<ul><li>Add http://www.informatik.uni-oldenburg.de</li>
<li>Uncheck "Requires server verificaton..."</li>
<li>Click "OK"</li>
</ul></li>
<li>Check "Custom (for expert users)"</li>
<li>Click "Settings..."
<ul><li>Under Java/Java permissions, check "Custom"</li>
<li>Click "Java Custom Settings"
<ul><li>Select "Edit Permissions" tab</li>
<li>Under "Unsigned Content"/"Run Unsigned Content", make sure
"Run in sandbox" is checked and then check all the "Enable"
buttons under "Additional Unsigned Permissions"</li>
<li>Click "OK"</li>
</ul></li>
<li>Click "OK"</li>
</ul></li>
<li>Click "OK"</li>
</ul>
</td>
</table>
<hr>
<p><A HREF="mailto:Jochen.Hoenicke@Informatik.Uni-Oldenburg.DE">
http://www.informatik.uni-oldenburg.de/~delwi/jode/applet.html</A>, last
updated on <em>24-Okt-1999</em>.</p>
</body>
</html>

@ -0,0 +1,87 @@
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 3.0//EN">
<html>
<head>
<title>Java Optimize and Decompile Environment (JODE)</title>
<meta name="robots" content="noindex">
<meta name="date" content="1999-10-24">
</head>
<body>
<table cellpadding=4 cellspacing=1 width=100%>
<tr>
<td></td>
<td> <img src="jode-logo.gif" alt="JODE" width=286 height=110></td>
</tr>
<tr>
<td valign="top">
<B><a href="http://www.informatik.uni-oldenburg.de/~delwi">Homepage</a></B>
<br><br>
<a href="jode.html">
<B>Jode</B></a>
<ul>
<li><a href="applet.html">Test It Online</a></li>
<li>Download</li>
<li><a href="usage.html">Usage</a></li>
<li><a href="license.html">License</a></li>
<li><a href="history.html">History</a></li>
</ul>
</td>
<td>
<h2>Download</h2>
The simplest way is to get it in precompiled form. I have two jar
archives:
<ul>
<li><a href="jode-@VERSION@-1.1.jar">jode-@VERSION@-1.1.jar</a> is for
JDK&nbsp;1.1. It already contains gnu.getopt, but you need to
download the <a
href="http://java.sun.com/beans/infobus/#DOWNLOAD_COLLECTIONS">collection
classes</a>. If you want to use the swing interface, you have to
download <a href="http://java.sun.com/products/jfc/index.html#download-swing">swing</a> separately. </li> <li><a
href="jode-@VERSION@-1.2.jar">jode-@VERSION@-1.2.jar</a> is for
JDK&nbsp;1.2. It already contains gnu.getopt, so you don't need any
other package.</li>
</ul>
<a href="jode-@VERSION@.tar.gz">jode-@VERSION@.tar.gz</a> is the source
code. You need many unix tools to compile this file. It also works
under windows with <a
href="http://sourceware.cygnus.com/cygwin/">cygwin</a> and unzip.</li>
<h2>Other packages you may need</h2>
<dl>
<dt>CYGWIN (unix tools for win95/NT)</dt>
<dd>
<a href="http://sourceware.cygnus.com/cygwin/">http://sourceware.cygnus.com/cygwin/</a>
</dd>
<dt>JDK 1.1:</dt>
<dd>
<a href="http://java.sun.com/products/jdk/1.1/index.htm">http://java.sun.com/products/jdk/1.1/index.htm</a>
</dd>
<dt>Collection classes and Swing for JDK 1.1:<dt>
<dd>
<a href="http://java.sun.com/beans/infobus/#DOWNLOAD_COLLECTIONS">http://java.sun.com/beans/infobus/#DOWNLOAD_COLLECTIONS</a>
<a href="http://java.sun.com/products/jfc/index.html#download-swing">http://java.sun.com/products/jfc/index.html#download-swing</a>
</dd>
<dt>JDK 1.2:</dt>
<dd>
<a href="http://java.sun.com/products/jdk/1.2/index.html">http://java.sun.com/products/jdk/1.2/index.html</a>
</dd>
<dt>Getopt:</dt>
<dd>
<a href="http://www.urbanophile.com/arenn/hacking/download.html#getopt">http://www.urbanophile.com/arenn/hacking/download.html#getopt</a>
</dd>
</dl>
</td>
</table>
<hr>
<p><A HREF="mailto:Jochen.Hoenicke@Informatik.Uni-Oldenburg.DE">
http://www.informatik.uni-oldenburg.de/~delwi/jode/download.html</A>, last
updated on <em>24-Okt-1999</em>.</p>
</body>
</html>

@ -0,0 +1,59 @@
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 3.0//EN">
<html>
<head>
<title>Java Optimize and Decompile Environment (JODE)</title>
<meta name="robots" content="noindex">
<meta name="date" content="1999-10-24">
</head>
<body>
<table cellpadding=4 cellspacing=1 width=100%>
<tr>
<td></td>
<td> <img src="jode-logo.gif" alt="JODE" width=286 height=110></td>
</tr>
<tr>
<td valign="top">
<B><a href="http://www.informatik.uni-oldenburg.de/~delwi">Homepage</a></B>
<br><br>
<a href="jode.html">
<B>Jode</B></a>
<ul>
<li><a href="applet.html">Test It Online</a></li>
<li><a href="download.html">Download</a></li>
<li><a href="usage.html">Usage</a></li>
<li><a href="license.html">License</a></li>
<li>History</li>
</ul>
</td>
<td>
<h2>Why did I wrote it?</h2>
<p>Someday I found <code>guavad</code>, a disassembler for java byte
code (it does similar things like <code>javap&nbsp;-c</code>). I used
it on a class file, and found that it was possible to reconstruct the
original java code. First I did it by hand on some small routines,
but I soon realized that it was a rather stupid task, and that I could
write a <a href="dasm_to_java.perl"><code>perl</code> script</a>
that does the same. At the end of the next day I had a working
decompiler.</p>
<p>Now while it was working, it was not easy to use. You had to
decompile the code first with a disassembler, cut the method, you
wanted to decompile and then run the perl script on it. So I decided
to get some information of the class files and do this all
automatically. I decided to write it in <code>java</code> now,
because it suited best.</p>
<p>Just for the records: the java code is now more than 50 times
bigger than the original perl script and is still growing.</p>
</td>
</table>
<hr>
<p><A HREF="mailto:Jochen.Hoenicke@Informatik.Uni-Oldenburg.DE">
http://www.informatik.uni-oldenburg.de/~delwi/jode/history.html</A>, last
updated on <em>24-Okt-1999</em>.</p>
</body>
</html>

@ -1,39 +0,0 @@
<html>
<head>
<title>Jode Test Applet</title>
</head>
<body>
<a href="jode.html">Up</a>
<h1>Test Applet</h1>
<applet code="jode/JodeApplet.class" archive="jode-applet.jar" width=640 height=400>
<param name=classpath
value="http://www.informatik.uni-oldenburg.de/~delwi/jode/jode_cls.zip">
<param name=class value="jode.JodeApplet">
</applet><br><br>
Press the start button to decompile this applet. You may change the
class path and class name to point to a class file of your choice.
But note that most browsers doesn't allow loading files from a
different server.<br><br>
Save probably doesn't work, because it is forbidden by the browser.<br><br>
You may give multiple entries in the class path field separated by a
comma. The components may be local or remote zip or jar files or
directories. Note that browsers forbid accesses to different hosts or
local files that are not in a subdirectory of the applet
directory.<br><br>
BTW: If you just want to read the source, you may <a
href="http://www.informatik.uni-oldenburg.de/~delwi/jode">browse it
online</a> <code>:-)</code><br><br>
You can download this, look <a href="jode-useapplet.html">here</a> for
a description.
</body>
</html>

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@ -1,15 +0,0 @@
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 3.0//EN">
<html>
<head>
<title>Using the obfuscator</title>
</head>
<body>
<a href="jode.html">Up</a>
The obfuscator currently takes a lot of options (I plan to use an
extra file containing the options). You should therefore create a
script (or batch file under Windows) that invokes the obfuscator.<br>
</body>

@ -1,97 +0,0 @@
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 3.0//EN">
<html>
<head>
<title>Using the decompiler under Unix</title>
</head>
<body>
<a href="jode.html">Up</a>
<h1>Step by Step</h1>
You need java version 1.1 or higher. In the following description I
assume you have the JDK 1.1, residing in <code>/usr/lib/java</code>.
For other installations you have to adopt the paths. Also I use the
bourne shell syntax.
<ol>
<li> Set the classpath. It should include the jode_cls.zip as well as
the directory where the class files you want to decompile resides.
You can also specify a zip file instead of a directory. It is
also a good idea to include the zip resp. jar file containing the
basic <code>java.*</code> class files.
<pre>
export CLASSPATH=$HOME/jode_cls.zip:$HOME/download:/usr/lib/java/lib/classes.zip
</pre>
</li>
<li> Now you can start the graphical interface as following (Note the
case of the parameter)
<pre>
java jode.JodeWindow
</pre>
</li>
<li> The classpath field should already contain the classpath you set
above. The class field contains <code>jode.JodeWindow</code> and
you may push start immediately to decompile this class.
</li>
<li> If you want to decompile your own <code>.class</code> file, enter
the name of the file without <code>.class</code> extension and
push the start button. Change the class path if it doesn't point
to the right directory.
</li>
<li> After decompiling, you can save the file using the save button.
</li>
</ol>
<h1>Packaged classes</h1>
If the class file belongs to a package (like jode.JodeWindow) you
have to give the full qualified class name (the package names
separated by a dot followed by the class name). The class path should
point to the directory containing the package sub directories in this
case. <br><br>
<h1>Command line utility</h1>
There is also a command line utility which is much more powerful, but
also more difficult to use. You can start it (after setting the
classpath) with
<pre>
java jode.Decompiler
</pre>
and get a list of the supported parameters. To decompile the whole
decompiler you can use these magic lines:
<pre>
mkdir src
CLASSPATH=jode_cls.zip java jode.Decompiler --dest src \
`unzip -v jode_cls.zip|grep .class|cut -c59-|sed s/.class//|sed s?/?.?g`
</pre>
<h1>Obfuscator</h1>
So you want to protect your classes from decompiling? Well that is
your choice. You may use my obfuscator. The class files are
decompileable again (except when using -strong option, but this is
reversable by obfuscating again), but at least the information about
the names of identifiers are completely lost. <br><br>
The obfuscator is quite difficult to use (this is why I hided this
section here) and there is only a short description of the command
line parameters:
<pre>
CLASSPATH=jode_cls.zip java jode.Obfuscator
</pre>
As a hint, to obfuscate the obfuscator use the following command line:
<pre>
CLASSPATH=jode_cls.zip java jode.Obfuscator \
-cp jode_cls.zip:/usr/lib/java/lib/classes.zip -d obfuscated.zip \
-weak -revtable translate.tbl -swaporder \
-preserve jode.Obfuscator.main jode
</pre>
The options <code>-unique</code> and <code>-table</code> can be
helpful to deobfuscate obfuscated code.
</body>

@ -1,49 +0,0 @@
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 3.0//EN">
<html>
<head>
<title>Using the decompiler as applet (locally)</title>
</head>
<body>
<a href="jode.html">Up</a>
<h1>Step by Step</h1>
If you want to use the applet version you need a recent Internet
Explorer or Netscape which supports java 1.1. You can also use the
appletviewer of the java development kit.
<ol>
<li> Copy <a
href="http://www.informatik.uni-oldenburg.de/~delwi/jode/jode-applet.html"
>jode-applet.html</a> into a local directory.
</li>
<li> Copy <a
href="http://www.informatik.uni-oldenburg.de/~delwi/jode/jode_cls.zip"
>jode_cls.zip</a> to the <b>same</b> directory.
</li>
<li> Copy the <code>.class</code> file or <code>zip</code> file, you
want to decompile, to that directory.
</li>
<li> Load the html file into Netscape or Internet Explorer.
</li>
<li> Set the classpath simply to `<code>.</code>' (without quotes).
You may also specify a zip or jar file here. Note that applet and
class files must be in the same directory due to security policy. <br>
You can also change the default classpath in the html file.
</li>
<li> Enter the name of the class without <code>.class</code>
extension.
</li>
<li> Press start button in applet. </li>
<li> Press save button to save the decompiled code. </li>
</ol>
<h1>Packaged classes</h1>
If the class file belongs to a package (like jode.JodeWindow) you
have to give the full qualified class name (the package names
separated by a dot followed by the class name). The class path should
point to the directory containing the package sub directories in this
case.
</body>

@ -1,62 +0,0 @@
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 3.0//EN">
<html>
<head>
<title>Using the decompiler under Windows</title>
</head>
<body>
<a href="jode.html">Up</a>
<h1>Step by Step</h1>
You need java version 1.1 or higher. I suggest using the Sun JDK or
JRE 1.1 or 1.2. In the following description I assume Sun JDK 1.2,
for other virtual machines the paths and the name of the java
interpreter (<code>c:\jdk1.2\java</code>) may differ. <br><br>
<ol>
<li> Set the classpath. It should include the jode_cls.zip as well as
the directory where the class files you want to decompile resides.
You can also specify a zip file instead of a directory. It is
also a good Idea to include the zip resp. jar file containing the
basic <code>java.*</code> class files.
<pre>
set CLASSPATH=c:\temp\jode_cls.zip;c:\temp;c:\jdk1.2\jre\lib\rt.jar
</pre>
</li>
<li> Now you can start the graphical interface as following (Note the
case of the parameter)
<pre>
c:\jdk1.2\java jode.JodeWindow
</pre>
</li>
<li> The classpath field should already contain the classpath you set
above. The class field contains <code>jode.JodeWindow</code> and
you may push start immediately to decompile this class.
</li>
<li> If you want to decompile your own <code>.class</code> file, enter
the name of the file without <code>.class</code> extension and
push the start button. Change the class path if it doesn't point
to the right directory.
</li>
<li> After decompiling, you can save the file using the save button.
</li>
</ol>
<h1>Packaged classes</h1>
If the class file belongs to a package (like jode.JodeWindow) you
have to give the full qualified class name (the package names
separated by a dot followed by the class name). The class path should
point to the directory containing the package sub directories in this
case. <br><br>
<h1>Command line utility</h1>
There is also a command line utility which is much more powerful, but
also more difficult to use. You can start it (after setting the
classpath) with
<pre>
c:\jdk1.2\java jode.Decompiler
</pre>
and get a list of the supported parameters.
</body>

@ -1,70 +1,96 @@
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<html> <html>
<head> <head>
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<meta name="description" content="The home page of jode, my Java decompiler."> <meta name="description" content="The home page of jode, my Java decompiler.">
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<meta name="keywords" content="jode, java, decompile, decompiler, <meta name="keywords" content="jode, java, decompile, decompiler,
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<a href="http://www.informatik.uni-oldenbur.de/~delwi/jode/jode.html"> <table cellpadding=4 cellspacing=1 width=100%>
An uptodate version of this page is located here.</a><p> <tr>
<td></td>
<h2>What is it?</h2> <td> <img src="jode-logo.gif" alt="JODE" width=286 height=110></td>
</tr>
<P>This is a decompiler for java I have written in my spare time. It <tr>
takes class-files as input and produces something similar to the <td valign="top">
original java-File. Of course this can't be perfect: There is no way <B><a href="http://www.informatik.uni-oldenburg.de/~delwi">Homepage</a></B>
to produce the comments or the names of local variables (except when <br><br>
compiled with <code>-g</code>) and there are often more ways to write <a
the same thing. But it does its job quite well.</P> href="http://www.informatik.uni-oldenburg.de/~delwi/jode/jode.html">
<B>Jode</B></a>
<h2>Quick Test</h2> <ul>
I have now an applet interface to the decompiler. <li><a href="applet.html">Test It Online</a></li>
<a href="jode-applet.html">Check it out</a>. <li><a href="download.html">Download</a></li>
<li><a href="usage.html">Usage</a></li>
<h2>How to get it</h2> <li><a href="license.html">License</a></li>
<P>You can donwload the files in zip form. <li><a href="history.html">History</a></li>
The <a href="jode_src.zip">sources</a> contain only the </ul>
<code>java</code> files, the <a href="jode_cls.zip">classes</a> </td>
contain only the <code>class</code> files. </p> <td>
<P><i>JODE</i> is a java package containing a decompiler and an
<p>I also have a <a href="jode.tar.gz">tar.gz file</a> containing only optimizer (aka obfuscator ;-) for java. This package was totally
the <code>RCS</code> directories. This is the form I maintain the written in my spare time and is available for free (see <a
project, but you probably need unix and a few tools to use them.</p> href="license.html">license</a>).<p>
<p>There are also some <a href="snapshot/">snapshots</a> that have new <P>The decompiler takes <tt>class</tt> files as input and produces
features like inner and anonymous classes. </p> something similar to the original <tt>java</tt> file. Of course this
can't be perfect: There is no way to produce the comments or the names
<p><a href=".">Click here</a> to browse the files online. of local variables (except when compiled with debuging) and there are
</p> often more ways to write the same thing. But <i>JODE</i> does its job
quite well, so you should give it a try: <a href="applet.html">start
the applet</a>.</P>
<P>The optimizer transforms <tt>class</tt> files in various ways with
can be controlled by a script file. It supports the following
operations:</p>
<ul>
<li>Renaming class, method, field and local names to shorter or unique
names or according to a given translation table</li>
<li>Removing debugging information</li>
<li>Removing dead code (classes, fields, methods) and constant
fields</li>
<li>Optimizing local variable allocation</li>
</ul>
<h2>News</h2>
<h2>How to use it</h2> <ul>
<li>I can now decompile <b>inner and anonymous</b> classes.</li>
<li>The optimizer (aka obfuscator) can now be customized via a small
config file</li>
<li>Jode is now <tt>autoconf</tt>igured.</li>
<li>I use the <a href="http://www.urbanophile.com/arenn/hacking/download.html#getopt">getopt</a> package</li>
</ul>
<p>I have some simple step by step pages. There are three <h3>Older News</h3>
possibilities:
<ul> <ul>
<li> <a href="jode-useapplet.html"> Using the applet version</a>. <li>There is a <a href="usage.html#swing">swing</a> interface</li>
This can make problem due to java's security policy, but is the <li>Jode handles zip and jar archives as both input and output.</li>
simplest way and works on most platforms.
</li>
<li> If you use Windows, you should look on <a
href="jode-win.html">this page</a>.</li>
<li> Unix users should look on <a href="jode-unix.html">this page</a>.
</ul> </ul>
<h2>Known bugs</h2> <h2>Known Bugs</h2>
<p>If not all dependent classes can be found, the verifier (which is
run before decompilation starts) may exit with a type error. You
can decompile it with <tt>--verify=off</tt>, but take the warning
serious, that the types may be incorrect. There's sometimes no way
to guess the right type, if you don't have access the full class
hierarchie.<br>
But if you don't have the dependent classes, you can't compile the
code again, anyway, so why do you want to decompile it?</p>
<p>There may be situations, where the code doesn't understand complex <p>There may be situations, where the code doesn't understand complex
expressions. In this many ugly temporary variables are used, but the expressions. In this many ugly temporary variables are used, but the
code should still be compileable. This does especially happen when code should still be compileable. This does especially happen when
you compile with `-O' flag and javac has inlined some methods. </p> you compile with <tt>`-O'</tt> flag and javac has inlined some
methods. </p>
<p>Sometimes this program may exit with an <code>Exception</code> or <p>Sometimes this program may exit with an <code>Exception</code> or
produce incorrect code. Most time the code can't be compiled, so that produce incorrect code. Most time the code can't be compiled, so that
@ -73,53 +99,19 @@ those that occur on some of the <code>jode.test</code> files, I would
be very interested in a bug report (including the <code>class</code> be very interested in a bug report (including the <code>class</code>
file, if possible).</p> file, if possible).</p>
<p>Sometimes it generates some <code>GOTO</code> expression and <p>Sometimes <i>JODE</i> generates some GOTO expression and labels. This
labels. This can't be compiled, but shouldn't happen any more with shouldn't happen any more with code produced by javac or jikes.
javac or jikes.</p> But some flow obfuscator likes Zelix Klassmaster may provoke this.
In that case you can run the Obfuscator first (to optimize away the
<p>It doesn't handle inner and anonymous classes, yet. You can flow obfuscation ;-).</p>
decompile them separately, though (use `<code>+$</code>' switch under </td>
jikes), but there is a bug in javac, so that a final variable is twice </table>
initialized. If you encounter this problem just remove the doubled
line by hand. </p>
<p><b>New!</b> The latest <a href="snapshot">snapshot</a> can handle
inner and anonymous classes.</p>
<h2>Why did I wrote it?</h2>
<p>Someday I found <code>guavad</code>, a disassembler for java byte
code (it does similar things like <code>javap&nbsp;-c</code>). I used
it on a class file, and found that it was possible to reconstruct the
original java code. First I did it by hand on some small routines,
but I soon realized that it was a rather stupid task, and that I could
write a <a href="../perl/dasm_to_java.perl"><code>perl</code> script</a>
that does the same. At the end of the next day I had a working
decompiler.</p>
<p>Now while it was working, it was not easy to use. You had to
decompile the code first with a disassembler, cut the method, you
wanted to decompile and then run the perl script on it. So I decided
to get some information of the class files and do this all
automatically. I decided to write it in <code>java</code> now,
because it suited best.</p>
<p>Just for the records: the java code is now more than 50 times
bigger than the original perl script and is still growing.</p>
<h2>License</h2>
<p>This code is under GNU GPL. That basically means, that you can copy
or modify this code, as long as you put all your modification under
the GPL again. <A HREF="http://www.gnu.org/copyleft/gpl.html"> Look
here for the complete license</a>.</p>
<hr> <hr>
<p><A HREF="mailto:Jochen.Hoenicke@Informatik.Uni-Oldenburg.DE"> <p><A HREF="mailto:Jochen.Hoenicke@Informatik.Uni-Oldenburg.DE">
http://www.informatik.uni-oldenburg.de/~delwi/jode/jode.html</A>, last http://www.informatik.uni-oldenburg.de/~delwi/jode/jode.html</A>, last
updated on <em>17-Jun-1999</em>.</p> updated on <em>24-Okt-1999</em>.</p>
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@ -0,0 +1,530 @@
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 3.0//EN">
<html>
<head>
<TITLE>GNU General Public License - GNU Project - Free Software Foundation (FSF)</TITLE>
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<meta name="date" content="1999-10-24">
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<body>
<table cellpadding=4 cellspacing=1 width=100%>
<tr>
<td></td>
<td> <img src="jode-logo.gif" alt="JODE" width=286 height=110></td>
</tr>
<tr>
<td valign="top">
<B><a href="http://www.informatik.uni-oldenburg.de/~delwi">Homepage</a></B>
<br><br>
<a href="jode.html">
<B>Jode</B></a>
<ul>
<li><a href="applet.html">Test It Online</a></li>
<li><a href="download.html">Download</a></li>
<li><a href="usage.html">Usage</a></li>
<li>License</li>
<li><a href="history.html">History</a></li>
</ul>
</td>
<td>
<h2>License</h2>
<p><i>JODE</i> is Copyright 1998,1999 by Jochen Hoenicke. It is
released under GNU GPL. That basically means, that you can copy or
modify this code, as long as you put all your modification under the
GPL again. Here is the complete license:</p>
<H2>Table of Contents</H2>
<UL>
<LI><A NAME="TOC1" HREF="#SEC1">GNU GENERAL PUBLIC LICENSE</A>
<UL>
<LI><A NAME="TOC2" HREF="#SEC2">Preamble</A>
<LI><A NAME="TOC3" HREF="#SEC3">TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION</A>
<LI><A NAME="TOC4" HREF="#SEC4">How to Apply These Terms to Your New Programs</A>
</UL>
</UL>
<P>
<HR>
<P>
<H2><A NAME="SEC1" HREF="#TOC1">GNU GENERAL PUBLIC LICENSE</A></H2>
<P>
Version 2, June 1991
</P>
<PRE>
Copyright (C) 1989, 1991 Free Software Foundation, Inc.
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
</PRE>
<H2><A NAME="SEC2" HREF="#TOC2">Preamble</A></H2>
<P>
The licenses for most software are designed to take away your
freedom to share and change it. By contrast, the GNU General Public
License is intended to guarantee your freedom to share and change free
software--to make sure the software is free for all its users. This
General Public License applies to most of the Free Software
Foundation's software and to any other program whose authors commit to
using it. (Some other Free Software Foundation software is covered by
the GNU Library General Public License instead.) You can apply it to
your programs, too.
</P>
<P>
When we speak of free software, we are referring to freedom, not
price. Our General Public Licenses are designed to make sure that you
have the freedom to distribute copies of free software (and charge for
this service if you wish), that you receive source code or can get it
if you want it, that you can change the software or use pieces of it
in new free programs; and that you know you can do these things.
</P>
<P>
To protect your rights, we need to make restrictions that forbid
anyone to deny you these rights or to ask you to surrender the rights.
These restrictions translate to certain responsibilities for you if you
distribute copies of the software, or if you modify it.
</P>
<P>
For example, if you distribute copies of such a program, whether
gratis or for a fee, you must give the recipients all the rights that
you have. You must make sure that they, too, receive or can get the
source code. And you must show them these terms so they know their
rights.
</P>
<P>
We protect your rights with two steps: (1) copyright the software, and
(2) offer you this license which gives you legal permission to copy,
distribute and/or modify the software.
</P>
<P>
Also, for each author's protection and ours, we want to make certain
that everyone understands that there is no warranty for this free
software. If the software is modified by someone else and passed on, we
want its recipients to know that what they have is not the original, so
that any problems introduced by others will not reflect on the original
authors' reputations.
</P>
<P>
Finally, any free program is threatened constantly by software
patents. We wish to avoid the danger that redistributors of a free
program will individually obtain patent licenses, in effect making the
program proprietary. To prevent this, we have made it clear that any
patent must be licensed for everyone's free use or not licensed at all.
</P>
<P>
The precise terms and conditions for copying, distribution and
modification follow.
</P>
<H2><A NAME="SEC3" HREF="#TOC3">TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION</A></H2>
<P>
<STRONG>0.</STRONG>
This License applies to any program or other work which contains
a notice placed by the copyright holder saying it may be distributed
under the terms of this General Public License. The "Program", below,
refers to any such program or work, and a "work based on the Program"
means either the Program or any derivative work under copyright law:
that is to say, a work containing the Program or a portion of it,
either verbatim or with modifications and/or translated into another
language. (Hereinafter, translation is included without limitation in
the term "modification".) Each licensee is addressed as "you".
<P>
Activities other than copying, distribution and modification are not
covered by this License; they are outside its scope. The act of
running the Program is not restricted, and the output from the Program
is covered only if its contents constitute a work based on the
Program (independent of having been made by running the Program).
Whether that is true depends on what the Program does.
<P>
<STRONG>1.</STRONG>
You may copy and distribute verbatim copies of the Program's
source code as you receive it, in any medium, provided that you
conspicuously and appropriately publish on each copy an appropriate
copyright notice and disclaimer of warranty; keep intact all the
notices that refer to this License and to the absence of any warranty;
and give any other recipients of the Program a copy of this License
along with the Program.
<P>
You may charge a fee for the physical act of transferring a copy, and
you may at your option offer warranty protection in exchange for a fee.
<P>
<STRONG>2.</STRONG>
You may modify your copy or copies of the Program or any portion
of it, thus forming a work based on the Program, and copy and
distribute such modifications or work under the terms of Section 1
above, provided that you also meet all of these conditions:
<P>
<UL>
<LI><STRONG>a)</STRONG>
You must cause the modified files to carry prominent notices
stating that you changed the files and the date of any change.
<P>
<LI><STRONG>b)</STRONG>
You must cause any work that you distribute or publish, that in
whole or in part contains or is derived from the Program or any
part thereof, to be licensed as a whole at no charge to all third
parties under the terms of this License.
<P>
<LI><STRONG>c)</STRONG>
If the modified program normally reads commands interactively
when run, you must cause it, when started running for such
interactive use in the most ordinary way, to print or display an
announcement including an appropriate copyright notice and a
notice that there is no warranty (or else, saying that you provide
a warranty) and that users may redistribute the program under
these conditions, and telling the user how to view a copy of this
License. (Exception: if the Program itself is interactive but
does not normally print such an announcement, your work based on
the Program is not required to print an announcement.)
</UL>
These requirements apply to the modified work as a whole. If
identifiable sections of that work are not derived from the Program,
and can be reasonably considered independent and separate works in
themselves, then this License, and its terms, do not apply to those
sections when you distribute them as separate works. But when you
distribute the same sections as part of a whole which is a work based
on the Program, the distribution of the whole must be on the terms of
this License, whose permissions for other licensees extend to the
entire whole, and thus to each and every part regardless of who wrote it.
<P>
Thus, it is not the intent of this section to claim rights or contest
your rights to work written entirely by you; rather, the intent is to
exercise the right to control the distribution of derivative or
collective works based on the Program.
<P>
In addition, mere aggregation of another work not based on the Program
with the Program (or with a work based on the Program) on a volume of
a storage or distribution medium does not bring the other work under
the scope of this License.
<P>
<STRONG>3.</STRONG>
You may copy and distribute the Program (or a work based on it,
under Section 2) in object code or executable form under the terms of
Sections 1 and 2 above provided that you also do one of the following:
<!-- we use this doubled UL to get the sub-sections indented, -->
<!-- while making the bullets as unobvious as possible. -->
<UL>
<LI><STRONG>a)</STRONG>
Accompany it with the complete corresponding machine-readable
source code, which must be distributed under the terms of Sections
1 and 2 above on a medium customarily used for software interchange; or,
<P>
<LI><STRONG>b)</STRONG>
Accompany it with a written offer, valid for at least three
years, to give any third party, for a charge no more than your
cost of physically performing source distribution, a complete
machine-readable copy of the corresponding source code, to be
distributed under the terms of Sections 1 and 2 above on a medium
customarily used for software interchange; or,
<P>
<LI><STRONG>c)</STRONG>
Accompany it with the information you received as to the offer
to distribute corresponding source code. (This alternative is
allowed only for noncommercial distribution and only if you
received the program in object code or executable form with such
an offer, in accord with Subsection b above.)
</UL>
The source code for a work means the preferred form of the work for
making modifications to it. For an executable work, complete source
code means all the source code for all modules it contains, plus any
associated interface definition files, plus the scripts used to
control compilation and installation of the executable. However, as a
special exception, the source code distributed need not include
anything that is normally distributed (in either source or binary
form) with the major components (compiler, kernel, and so on) of the
operating system on which the executable runs, unless that component
itself accompanies the executable.
<P>
If distribution of executable or object code is made by offering
access to copy from a designated place, then offering equivalent
access to copy the source code from the same place counts as
distribution of the source code, even though third parties are not
compelled to copy the source along with the object code.
<P>
<STRONG>4.</STRONG>
You may not copy, modify, sublicense, or distribute the Program
except as expressly provided under this License. Any attempt
otherwise to copy, modify, sublicense or distribute the Program is
void, and will automatically terminate your rights under this License.
However, parties who have received copies, or rights, from you under
this License will not have their licenses terminated so long as such
parties remain in full compliance.
<P>
<STRONG>5.</STRONG>
You are not required to accept this License, since you have not
signed it. However, nothing else grants you permission to modify or
distribute the Program or its derivative works. These actions are
prohibited by law if you do not accept this License. Therefore, by
modifying or distributing the Program (or any work based on the
Program), you indicate your acceptance of this License to do so, and
all its terms and conditions for copying, distributing or modifying
the Program or works based on it.
<P>
<STRONG>6.</STRONG>
Each time you redistribute the Program (or any work based on the
Program), the recipient automatically receives a license from the
original licensor to copy, distribute or modify the Program subject to
these terms and conditions. You may not impose any further
restrictions on the recipients' exercise of the rights granted herein.
You are not responsible for enforcing compliance by third parties to
this License.
<P>
<STRONG>7.</STRONG>
If, as a consequence of a court judgment or allegation of patent
infringement or for any other reason (not limited to patent issues),
conditions are imposed on you (whether by court order, agreement or
otherwise) that contradict the conditions of this License, they do not
excuse you from the conditions of this License. If you cannot
distribute so as to satisfy simultaneously your obligations under this
License and any other pertinent obligations, then as a consequence you
may not distribute the Program at all. For example, if a patent
license would not permit royalty-free redistribution of the Program by
all those who receive copies directly or indirectly through you, then
the only way you could satisfy both it and this License would be to
refrain entirely from distribution of the Program.
<P>
If any portion of this section is held invalid or unenforceable under
any particular circumstance, the balance of the section is intended to
apply and the section as a whole is intended to apply in other
circumstances.
<P>
It is not the purpose of this section to induce you to infringe any
patents or other property right claims or to contest validity of any
such claims; this section has the sole purpose of protecting the
integrity of the free software distribution system, which is
implemented by public license practices. Many people have made
generous contributions to the wide range of software distributed
through that system in reliance on consistent application of that
system; it is up to the author/donor to decide if he or she is willing
to distribute software through any other system and a licensee cannot
impose that choice.
<P>
This section is intended to make thoroughly clear what is believed to
be a consequence of the rest of this License.
<P>
<STRONG>8.</STRONG>
If the distribution and/or use of the Program is restricted in
certain countries either by patents or by copyrighted interfaces, the
original copyright holder who places the Program under this License
may add an explicit geographical distribution limitation excluding
those countries, so that distribution is permitted only in or among
countries not thus excluded. In such case, this License incorporates
the limitation as if written in the body of this License.
<P>
<STRONG>9.</STRONG>
The Free Software Foundation may publish revised and/or new versions
of the General Public License from time to time. Such new versions will
be similar in spirit to the present version, but may differ in detail to
address new problems or concerns.
<P>
Each version is given a distinguishing version number. If the Program
specifies a version number of this License which applies to it and "any
later version", you have the option of following the terms and conditions
either of that version or of any later version published by the Free
Software Foundation. If the Program does not specify a version number of
this License, you may choose any version ever published by the Free Software
Foundation.
<P>
<STRONG>10.</STRONG>
If you wish to incorporate parts of the Program into other free
programs whose distribution conditions are different, write to the author
to ask for permission. For software which is copyrighted by the Free
Software Foundation, write to the Free Software Foundation; we sometimes
make exceptions for this. Our decision will be guided by the two goals
of preserving the free status of all derivatives of our free software and
of promoting the sharing and reuse of software generally.
<P><STRONG>NO WARRANTY</STRONG></P>
<P>
<STRONG>11.</STRONG>
BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS
TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE
PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
REPAIR OR CORRECTION.
<P>
<STRONG>12.</STRONG>
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES.
<P>
<H2>END OF TERMS AND CONDITIONS</H2>
<H2><A NAME="SEC4" HREF="#TOC4">How to Apply These Terms to Your New Programs</A></H2>
<P>
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
</P>
<P>
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
convey the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
</P>
<PRE>
<VAR>one line to give the program's name and an idea of what it does.</VAR>
Copyright (C) <VAR>yyyy</VAR> <VAR>name of author</VAR>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
</PRE>
<P>
Also add information on how to contact you by electronic and paper mail.
</P>
<P>
If the program is interactive, make it output a short notice like this
when it starts in an interactive mode:
</P>
<PRE>
Gnomovision version 69, Copyright (C) <VAR>yyyy</VAR> <VAR>name of author</VAR>
Gnomovision comes with ABSOLUTELY NO WARRANTY; for details
type `show w'. This is free software, and you are welcome
to redistribute it under certain conditions; type `show c'
for details.
</PRE>
<P>
The hypothetical commands <SAMP>`show w'</SAMP> and <SAMP>`show c'</SAMP> should show
the appropriate parts of the General Public License. Of course, the
commands you use may be called something other than <SAMP>`show w'</SAMP> and
<SAMP>`show c'</SAMP>; they could even be mouse-clicks or menu items--whatever
suits your program.
</P>
<P>
You should also get your employer (if you work as a programmer) or your
school, if any, to sign a "copyright disclaimer" for the program, if
necessary. Here is a sample; alter the names:
</P>
<PRE>
Yoyodyne, Inc., hereby disclaims all copyright
interest in the program `Gnomovision'
(which makes passes at compilers) written
by James Hacker.
<VAR>signature of Ty Coon</VAR>, 1 April 1989
Ty Coon, President of Vice
</PRE>
<P>
This General Public License does not permit incorporating your program into
proprietary programs. If your program is a subroutine library, you may
consider it more useful to permit linking proprietary applications with the
library. If this is what you want to do, use the GNU Library General
Public License instead of this License.
</td>
</table>
<hr>
<p><A HREF="mailto:Jochen.Hoenicke@Informatik.Uni-Oldenburg.DE">
http://www.informatik.uni-oldenburg.de/~delwi/jode/history.html</A>, last
updated on <em>24-Okt-1999</em>.</p>
</body>
</html>

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# This is a sample script file to obfuscate my project
strip = "unreach","lvt","inner"
load = new WildCard { value = "org.myorg.myproject" },
new WildCard { value = "org.myorg.mylib*" },
new WildCard { value = "org.otherorg.shortlib" }
preserve = new WildCard { value = "org.myorg.application.main.*" },
new WildCard { value = "org.myorg.applet.<init>.()V" },
new WildCard { value = "org.resources.bundle*.<init>.()V" },
new MultiIdentifierMatcher {
and = new WildCard { value = "org.myorg.publiclib.*" },
new ModifierMatcher { access = "PUBLIC" }
}
renamer = ney KeywordRenamer {
backup = new StrongRenamer {
charsetStart = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
charsetPart =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_"
charsetPackage = "abcdefghijklmnopqrstuvwxyz"
charsetClass = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
}
}
analyzer = new SimpleAnalyzer
post = new LocalOptimizer, new RemovePopAnalyzer

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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 3.0//EN">
<html>
<head>
<title>Java Optimize and Decompile Environment (JODE)</title>
<meta name="robots" content="noindex">
<meta name="date" content="1999-10-24">
</head>
<body>
<table cellpadding=4 cellspacing=1 width=100%>
<tr>
<td></td>
<td> <img src="jode-logo.gif" alt="JODE" width=286 height=110></td>
</tr>
<tr>
<td valign="top">
<B><a href="http://www.informatik.uni-oldenburg.de/~delwi">Homepage</a></B>
<br><br>
<a href="jode.html"><B>Jode</B></a>
<ul>
<li><a href="applet.html">Test It Online</a></li>
<li><a href="download.html">Download</a></li>
<li>Usage<br>
<a href="#decompiler">Decompiler</a><br>
&nbsp;&nbsp;&nbsp;<a href="#cmdline">Command&nbsp;Line</a><br>
&nbsp;&nbsp;&nbsp;<a href="#awt">AWT&nbsp;Interface</a><br>
&nbsp;&nbsp;&nbsp;<a href="#swing">Swing&nbsp;Interface</a><br>
<a href="#optimizer">Obfuscator</a><br>
</li><br>
<li><a href="license.html">License</a></li>
<li><a href="history.html">History</a></li>
</ul>
</td>
<td>
<a name="decompiler">
<h1>Using the Decompiler</h1></a>
After you have <a href="download.html">downloaded</a> the necessary
packages, put them into your <tt>CLASSPATH</tt>:
<ul><li>Under Windows you have to start a MSDOS session and type
something like:
<pre>
set CLASSPATH=C:\download\jode-xxx.jar;C:\swing\swingall.jar
</pre>
</li><li>Under Unix you start a shell and type (for bourne shell):
<pre>export CLASSPATH=/tmp/jode-xxx.jar:/usr/local/swing/swingall.jar</pre>
or for csh:
<pre>setenv CLASSPATH /tmp/jode-xxx.jar:/usr/local/swing/swingall.jar</pre>
</ul>
<a name="cmdline"><h3>Command Line Interface</h3></a>
The most powerful way to start <I>JODE</I>'s decompiler is the command
line interface. Some people don't like long command lines; they
should go to the next section. <br>
Start the class <tt>jode.Decompiler</tt> with the options. The
following command will give a complete list of the available commands:
<pre>java jode.Decompiler --help</pre>
<a name="awt"><h3>AWT Interface</h3></a>
The AWT Interface looks exactly like the <a
href="applet.html">applet</a>. In fact the applet uses the AWT
Interface. You start it after setting the <tt>CLASSPATH</tt> (see <a
href="#decompiler">above</a>), with
<pre>java jode.JodeWindow</pre>
In the classpath line you can enter a number of jar files, zip files
and directories separated by comma(<tt>,</tt>). Then enter the
dot(<tt>.</tt>) separated name of the class you want to decompile.
Press the <code>start</code> button and the decompiled class should
appear. You can save it via the <code>save</code> button.
<a name="swing"><h3>Swing Interface</h3></a>
For the swing interface you need java version 1.2 or the separately
available swing package (see <a href="download.html#swing">download
page</a>. <br>
The swing interface will show the package hierarchie of all classes
in the classpath on the left side. You can now select a class and the
decompiled code will appear on the right side. Via the menu, you may
change the classpath or switch between package hierarchie tree and
class inheritence tree.<br>
The swing interface is very nice, if you just want to work how
something works, and you don't have the source code. It is especially
useful to trace bugs through library code. It is not meant to
generate <tt>java</tt> files and so you won't find a save option
there.<br>
<a name="optimizer"><h1>Using the Obfuscator</h1>
To use the obfuscator you have to create a script file, say <a
href="myproject.jos"><tt>myproject.jos</tt></a>, with
the following contents (You have to adapt it to match your project, of
course). It should contain the following options:
<p>First select what you want to strip. There are several
possibilities, which can be separated by comma(<tt>,</tt>):</p>
<dl>
<dt>unreach</dt>
<dd>strip unreachable methods and classes.</dd>
<dt>source</dt>
<dd>remove the name of the java file (exceptions will get unreadable).</dd>
<dt>lnt</dt>
<dd>remove the line number table (exceptions will get unreadable).</dd>
<dt>lvt</dt>
<dd>remove the local variable table (debugging doesn't work).</dd>
<dt>inner</dt>
<dd>strip inner class info (reflection doesn't work correctly).</dd>
</dl>
<pre>
strip = "unreach","lvt","inner"
</pre>
<p>Select the packages and classes you want to obfuscate. You
should only include libraries, that you don't ship separately.</p>
<pre>
load = new WildCard { value = "org.myorg.myproject" },
new WildCard { value = "org.myorg.mylib*" },
new WildCard { value = "org.otherorg.shortlib" }
</pre>
<p>Select the methods and classes you want to preserve. This is
the <tt>main</tt> method for applications and the default constructor
<tt>&lt;init&gt;.()V</tt> for applets, resource bundles and other classes
that you load manually at runtime.<br> You have to give the method
name and the type signature to identify your method. <tt>javap
-s</tt> will show you the type signatures for your classes, but you
may also use <tt>*</tt>, to select all methods with that name.</p>
<pre>
preserve = new WildCard { value = "org.myorg.application.main.*" },
new WildCard { value = "org.myorg.applet.&lt;init&gt;.()V" },
new WildCard { value = "org.resources.bundle*.&lt;init&gt;.()V" }
</pre>
<p>If you want to obfuscate (or just shorten) the identifier you can
specify a renamer. There are currently following renamer
available</p>
<dl><dt>StrongRenamer</dt>
<dd>Renames to the shortest possible name. You can give a charset
that should be used. It uses the same name as much as possible.</dd>
<dt>UniqueRenamer</dt>
<dd>Renames to unique identifier of the form <tt>xxx123</tt>. Useful
to reduce name conflicts, before you decompile an obfuscated package.</dd>
<dt>NameSwapper</dt>
<dd>This renamer just swaps the names. This is a funny obfuscation
option that is not very strong, but very confusing.</dd>
<dt>KeywordRenamer</dt>
<dd>Renames identifiers to keyword. You can give your own list of
keywords as parameters. Resulting code is not decompilable directly,
but it is legal bytecode.</dd>
</dl>
<pre>
renamer = new KeywordRenamer
</pre>
<p>Now you can select the analyzer. The purpose of the
analyzer is to mark all reachable methods, find out which methods
needs to get the same name (overloading), and which method names
mustn't change (overload of library methods, e.g. <tt>nextElement</tt>
for <tt>Enumeration</tt>s). There are currently two analyzers.
<dl><dt>SimpleAnalyzer</dt>
<dd>Straight forward analyzer. It is fast and will remove dead code
on method basis.</dd>
<dd><dt>ConstantAnalyzer</dt>
<dd>Strong analyzer that will determine, which fields and instructions
have constant values. It will remove dead code on instruction basis
and replace constant instruction with a load constant, or remove them
completely.<br> This analyzer is especially useful to revert Zelix
Klassmaster's flow obfuscation.</dd>
</dl>
</p>
<pre>
analyzer = new SimpleAnalyzer
</pre>
<p>Pre- and Post transformers transform the bytecode before
resp. after the Analyzer runs. Using this defaults should be
okay.</p>
<pre>
post = new LocalOptimizer, new RemovePopAnalyzer
</pre>
</td>
</table>
<hr>
<p><A HREF="mailto:Jochen.Hoenicke@Informatik.Uni-Oldenburg.DE">
http://www.informatik.uni-oldenburg.de/~delwi/jode/usage.html</A>, last
updated on <em>24-Okt-1999</em>.</p>
</body>
</html>
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