/*******************************************************************************
* 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.bytecode;
import java.util.Map;
import javassist.CtBehavior;
import javassist.CtClass;
import javassist.CtField;
import javassist.CtMethod;
import javassist.bytecode.ConstPool;
import javassist.bytecode.Descriptor;
import com.google.common.collect.Maps;
import cuchaz.enigma.mapping.BehaviorEntry;
import cuchaz.enigma.mapping.BehaviorEntryFactory;
import cuchaz.enigma.mapping.ClassEntry;
import cuchaz.enigma.mapping.FieldEntry;
import cuchaz.enigma.mapping.MethodEntry;
import cuchaz.enigma.mapping.Translator;
public class ClassTranslator
{
private Translator m_translator;
public ClassTranslator( Translator translator )
{
m_translator = translator;
}
public void translate( CtClass c )
{
// NOTE: the order of these translations is very important
// translate all the field and method references in the code by editing the constant pool
ConstPool constants = c.getClassFile().getConstPool();
ConstPoolEditor editor = new ConstPoolEditor( constants );
for( int i=1; i<constants.getSize(); i++ )
{
switch( constants.getTag( i ) )
{
case ConstPool.CONST_Fieldref:
{
// translate the name
FieldEntry entry = new FieldEntry(
new ClassEntry( Descriptor.toJvmName( constants.getFieldrefClassName( i ) ) ),
constants.getFieldrefName( i )
);
FieldEntry translatedEntry = m_translator.translateEntry( entry );
// translate the type
String type = constants.getFieldrefType( i );
String translatedType = m_translator.translateSignature( type );
if( !entry.equals( translatedEntry ) || !type.equals( translatedType ) )
{
editor.changeMemberrefNameAndType( i, translatedEntry.getName(), translatedType );
}
}
break;
case ConstPool.CONST_Methodref:
case ConstPool.CONST_InterfaceMethodref:
{
// translate the name and type
BehaviorEntry entry = BehaviorEntryFactory.create(
Descriptor.toJvmName( editor.getMemberrefClassname( i ) ),
editor.getMemberrefName( i ),
editor.getMemberrefType( i )
);
BehaviorEntry translatedEntry = m_translator.translateEntry( entry );
if( !entry.getName().equals( translatedEntry.getName() ) || !entry.getSignature().equals( translatedEntry.getSignature() ) )
{
editor.changeMemberrefNameAndType( i, translatedEntry.getName(), translatedEntry.getSignature() );
}
}
break;
}
}
ClassEntry classEntry = new ClassEntry( Descriptor.toJvmName( c.getName() ) );
// translate all the fields
for( CtField field : c.getDeclaredFields() )
{
// translate the name
FieldEntry entry = new FieldEntry( classEntry, field.getName() );
String translatedName = m_translator.translate( entry );
if( translatedName != null )
{
field.setName( translatedName );
}
// translate the type
String translatedType = m_translator.translateSignature( field.getFieldInfo().getDescriptor() );
field.getFieldInfo().setDescriptor( translatedType );
}
// translate all the methods and constructors
for( CtBehavior behavior : c.getDeclaredBehaviors() )
{
if( behavior instanceof CtMethod )
{
CtMethod method = (CtMethod)behavior;
// translate the name
MethodEntry entry = new MethodEntry( classEntry, method.getName(), method.getSignature() );
String translatedName = m_translator.translate( entry );
if( translatedName != null )
{
method.setName( translatedName );
}
}
// translate the type
String translatedSignature = m_translator.translateSignature( behavior.getMethodInfo().getDescriptor() );
behavior.getMethodInfo().setDescriptor( translatedSignature );
}
// translate all the class names referenced in the code
// the above code only changed method/field/reference names and types, but not the class names themselves
Map<ClassEntry,ClassEntry> map = Maps.newHashMap();
for( ClassEntry obfClassEntry : ClassRenamer.getAllClassEntries( c ) )
{
ClassEntry deobfClassEntry = m_translator.translateEntry( obfClassEntry );
if( !obfClassEntry.equals( deobfClassEntry ) )
{
map.put( obfClassEntry, deobfClassEntry );
}
}
ClassRenamer.renameClasses( c, map );
}
}