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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.bytecode;
import java.util.Set;
import javassist.ClassMap;
import javassist.CtBehavior;
import javassist.CtClass;
import javassist.CtField;
import javassist.CtMethod;
import javassist.bytecode.ConstPool;
import javassist.bytecode.Descriptor;
import javassist.bytecode.InnerClassesAttribute;
import com.beust.jcommander.internal.Sets;
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 )
);
String translatedName = m_translator.translate( entry );
if( translatedName == null )
{
translatedName = entry.getName();
}
// translate the type
String type = constants.getFieldrefType( i );
String translatedType = m_translator.translateSignature( type );
if( !entry.getName().equals( translatedName ) || !type.equals( translatedType ) )
{
editor.changeMemberrefNameAndType( i, translatedName, translatedType );
}
}
break;
case ConstPool.CONST_Methodref:
case ConstPool.CONST_InterfaceMethodref:
{
// translate the name and type
MethodEntry entry = new MethodEntry(
new ClassEntry( Descriptor.toJvmName( editor.getMemberrefClassname( i ) ) ),
editor.getMemberrefName( i ),
editor.getMemberrefType( i )
);
String translatedName = m_translator.translate( entry );
if( translatedName == null )
{
translatedName = entry.getName();
}
String translatedSignature = m_translator.translateSignature( entry.getSignature() );
if( !entry.getName().equals( translatedName ) || !entry.getSignature().equals( translatedSignature ) )
{
editor.changeMemberrefNameAndType( i, translatedName, translatedSignature );
}
}
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() )
{
// translate the name
MethodEntry entry = new MethodEntry( classEntry, behavior.getName(), behavior.getSignature() );
String translatedName = m_translator.translate( entry );
if( translatedName != null )
{
if( behavior instanceof CtMethod )
{
((CtMethod)behavior).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
Set<ClassEntry> classEntries = getAllClassEntries( c );
ClassMap map = new ClassMap();
for( ClassEntry obfClassEntry : classEntries )
{
map.put( obfClassEntry.getName(), m_translator.translateEntry( obfClassEntry ).getName() );
}
c.replaceClassName( map );
// translate the names in the InnerClasses attribute
InnerClassesAttribute attr = (InnerClassesAttribute)c.getClassFile().getAttribute( InnerClassesAttribute.tag );
if( attr != null )
{
for( int i=0; i<attr.tableLength(); i++ )
{
ClassEntry obfClassEntry = new ClassEntry( Descriptor.toJvmName( attr.innerClass( i ) ) );
ClassEntry deobfClassEntry = m_translator.translateEntry( obfClassEntry );
attr.setInnerClassIndex( i, constants.addClassInfo( deobfClassEntry.getName() ) );
if( attr.outerClassIndex( i ) != 0 )
{
attr.setOuterClassIndex( i, constants.addClassInfo( deobfClassEntry.getOuterClassName() ) );
}
if( attr.innerNameIndex( i ) != 0 )
{
attr.setInnerNameIndex( i, constants.addUtf8Info( deobfClassEntry.getInnerClassName() ) );
}
/* DEBUG
System.out.println( String.format( "\tOBF: %s DEOBF: %s-> ATTR: %s,%s,%s",
obfClassEntry, deobfClassEntry,
attr.outerClass( i ),
attr.innerClass( i ),
attr.innerName( i )
) );
*/
}
}
}
private Set<ClassEntry> getAllClassEntries( CtClass c )
{
final Set<ClassEntry> entries = Sets.newHashSet();
ClassMap map = new ClassMap( )
{
@Override
public Object get( Object obj )
{
if( obj instanceof String )
{
entries.add( new ClassEntry( (String)obj ) );
}
return null;
}
private static final long serialVersionUID = -202160293602070641L;
};
c.replaceClassName( map );
return entries;
}
}
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