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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.Collection;
import javassist.CtClass;
import javassist.bytecode.AccessFlag;
import javassist.bytecode.ConstPool;
import javassist.bytecode.Descriptor;
import javassist.bytecode.InnerClassesAttribute;
import cuchaz.enigma.analysis.JarIndex;
import cuchaz.enigma.mapping.ClassEntry;
public class InnerClassWriter
{
private JarIndex m_jarIndex;
public InnerClassWriter( JarIndex jarIndex )
{
m_jarIndex = jarIndex;
}
public void write( CtClass c )
{
// get the outer class name
String obfClassName = Descriptor.toJvmName( c.getName() );
String obfOuterClassName = m_jarIndex.getOuterClass( obfClassName );
if( obfOuterClassName == null )
{
// this is an outer class
obfOuterClassName = obfClassName;
}
else
{
// this is an inner class, rename it to outer$inner
ClassEntry obfClassEntry = new ClassEntry( obfOuterClassName + "$" + new ClassEntry( obfClassName ).getSimpleName() );
c.setName( obfClassEntry.getName() );
}
// write the inner classes if needed
Collection<String> obfInnerClassNames = m_jarIndex.getInnerClasses( obfOuterClassName );
if( obfInnerClassNames != null )
{
writeInnerClasses( c, obfOuterClassName, obfInnerClassNames );
}
}
private void writeInnerClasses( CtClass c, String obfOuterClassName, Collection<String> obfInnerClassNames )
{
InnerClassesAttribute attr = new InnerClassesAttribute( c.getClassFile().getConstPool() );
c.getClassFile().addAttribute( attr );
for( String obfInnerClassName : obfInnerClassNames )
{
// get the new inner class name
ClassEntry obfClassEntry = new ClassEntry( obfOuterClassName + "$" + new ClassEntry( obfInnerClassName ).getSimpleName() );
// here's what the JVM spec says about the InnerClasses attribute
// append( inner, outer of inner if inner is member of outer 0 ow, name after $ if inner not anonymous 0 ow, flags );
// update the attribute with this inner class
ConstPool constPool = c.getClassFile().getConstPool();
int innerClassIndex = constPool.addClassInfo( obfClassEntry.getName() );
int outerClassIndex = 0;
int innerClassSimpleNameIndex = 0;
if( !m_jarIndex.isAnonymousClass( obfInnerClassName ) )
{
outerClassIndex = constPool.addClassInfo( obfClassEntry.getOuterClassName() );
innerClassSimpleNameIndex = constPool.addUtf8Info( obfClassEntry.getInnerClassName() );
}
attr.append(
innerClassIndex,
outerClassIndex,
innerClassSimpleNameIndex,
c.getClassFile().getAccessFlags() & ~AccessFlag.SUPER
);
/* DEBUG
System.out.println( String.format( "\tOBF: %s -> ATTR: %s,%s,%s (replace %s with %s)",
obfClassEntry,
attr.outerClass( attr.tableLength() - 1 ),
attr.innerClass( attr.tableLength() - 1 ),
attr.innerName( attr.tableLength() - 1 ),
obfInnerClassName, obfClassEntry.getName()
) );
*/
// make sure the outer class references only the new inner class names
c.replaceClassName( obfInnerClassName, obfClassEntry.getName() );
}
}
}
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