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/*******************************************************************************
* Copyright (c) 2014 Jeff Martin.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the GNU Public License v3.0
* which accompanies this distribution, and is available at
* http://www.gnu.org/licenses/gpl.html
*
* Contributors:
* Jeff Martin - initial API and implementation
******************************************************************************/
package cuchaz.enigma.analysis;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import javassist.ByteArrayClassPath;
import javassist.ClassPool;
import javassist.CtClass;
import javassist.NotFoundException;
import javassist.bytecode.Descriptor;
import javassist.bytecode.MethodInfo;
import com.google.common.collect.HashMultimap;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import com.google.common.collect.Multimap;
import cuchaz.enigma.Constants;
import cuchaz.enigma.mapping.ClassEntry;
import cuchaz.enigma.mapping.MethodEntry;
import cuchaz.enigma.mapping.Translator;
public class Ancestries implements Serializable
{
private static final long serialVersionUID = 738687982126844179L;
private Map<String,String> m_superclasses;
private Multimap<String,String> m_methodImplementations;
public Ancestries( )
{
m_superclasses = Maps.newHashMap();
m_methodImplementations = HashMultimap.create();
}
@SuppressWarnings( "unchecked" )
public void readFromJar( InputStream in )
throws IOException
{
ClassPool classPool = new ClassPool();
ZipInputStream zin = new ZipInputStream( in );
ZipEntry entry;
while( ( entry = zin.getNextEntry() ) != null )
{
// filter out non-classes
if( entry.isDirectory() || !entry.getName().endsWith( ".class" ) )
{
continue;
}
// read the class into a buffer
ByteArrayOutputStream bos = new ByteArrayOutputStream();
byte[] buf = new byte[Constants.KiB];
int totalNumBytesRead = 0;
while( zin.available() > 0 )
{
int numBytesRead = zin.read( buf );
if( numBytesRead < 0 )
{
break;
}
bos.write( buf, 0, numBytesRead );
// sanity checking
totalNumBytesRead += numBytesRead;
if( totalNumBytesRead > Constants.MiB )
{
throw new Error( "Class file " + entry.getName() + " larger than 1 MiB! Something is wrong!" );
}
}
// determine the class name (ie chop off the ".class")
String className = Descriptor.toJavaName( entry.getName().substring( 0, entry.getName().length() - ".class".length() ) );
// get a javassist handle for the class
classPool.insertClassPath( new ByteArrayClassPath( className, bos.toByteArray() ) );
try
{
CtClass c = classPool.get( className );
addSuperclass( c.getName(), c.getClassFile().getSuperclass() );
addMethodImplementations( c.getName(), (List<MethodInfo>)c.getClassFile().getMethods() );
}
catch( NotFoundException ex )
{
throw new Error( "Unable to load class: " + className );
}
}
}
private void addMethodImplementations( String name, List<MethodInfo> methods )
{
for( MethodInfo method : methods )
{
m_methodImplementations.put( name, getMethodKey( method.getName(), method.getDescriptor() ) );
}
}
public void addSuperclass( String className, String superclassName )
{
className = Descriptor.toJvmName( className );
superclassName = Descriptor.toJvmName( superclassName );
if( className.equals( superclassName ) )
{
throw new IllegalArgumentException( "Class cannot be its own superclass! " + className );
}
if( !isJre( className ) && !isJre( superclassName ) )
{
m_superclasses.put( className, superclassName );
}
}
public String getSuperclassName( String className )
{
return m_superclasses.get( className );
}
public List<String> getAncestry( String className )
{
List<String> ancestors = new ArrayList<String>();
while( className != null )
{
className = getSuperclassName( className );
if( className != null )
{
ancestors.add( className );
}
}
return ancestors;
}
public List<String> getSubclasses( String className )
{
// linear search is fast enough for now
List<String> subclasses = Lists.newArrayList();
for( Map.Entry<String,String> entry : m_superclasses.entrySet() )
{
String subclass = entry.getKey();
String superclass = entry.getValue();
if( className.equals( superclass ) )
{
subclasses.add( subclass );
}
}
return subclasses;
}
public boolean isMethodImplemented( MethodEntry methodEntry )
{
return isMethodImplemented( methodEntry.getClassName(), methodEntry.getName(), methodEntry.getSignature() );
}
public boolean isMethodImplemented( String className, String methodName, String methodSignature )
{
Collection<String> implementations = m_methodImplementations.get( className );
if( implementations == null )
{
return false;
}
return implementations.contains( getMethodKey( methodName, methodSignature ) );
}
public ClassInheritanceTreeNode getClassInheritance( Translator deobfuscatingTranslator, ClassEntry obfClassEntry )
{
// get the root node
List<String> ancestry = getAncestry( obfClassEntry.getName() );
ClassInheritanceTreeNode rootNode = new ClassInheritanceTreeNode( deobfuscatingTranslator, ancestry.get( ancestry.size() - 1 ) );
// expand all children recursively
rootNode.load( this, true );
return rootNode;
}
public MethodInheritanceTreeNode getMethodInheritance( Translator deobfuscatingTranslator, MethodEntry obfMethodEntry )
{
// travel to the ancestor implementation
String baseImplementationClassName = obfMethodEntry.getClassName();
for( String ancestorClassName : getAncestry( obfMethodEntry.getClassName() ) )
{
if( isMethodImplemented( ancestorClassName, obfMethodEntry.getName(), obfMethodEntry.getSignature() ) )
{
baseImplementationClassName = ancestorClassName;
}
}
// make a root node at the base
MethodEntry methodEntry = new MethodEntry(
new ClassEntry( baseImplementationClassName ),
obfMethodEntry.getName(),
obfMethodEntry.getSignature()
);
MethodInheritanceTreeNode rootNode = new MethodInheritanceTreeNode(
deobfuscatingTranslator,
methodEntry,
isMethodImplemented( methodEntry )
);
// expand the full tree
rootNode.load( this, true );
return rootNode;
}
private boolean isJre( String className )
{
return className.startsWith( "java/" )
|| className.startsWith( "javax/" );
}
private String getMethodKey( String name, String signature )
{
return name + signature;
}
}
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