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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.EnclosingMethodAttribute;
import javassist.bytecode.InnerClassesAttribute;
import cuchaz.enigma.Constants;
import cuchaz.enigma.analysis.JarIndex;
import cuchaz.enigma.mapping.BehaviorEntry;
import cuchaz.enigma.mapping.ClassEntry;
public class InnerClassWriter {
private JarIndex m_jarIndex;
public InnerClassWriter(JarIndex jarIndex) {
m_jarIndex = jarIndex;
}
public void write(CtClass c) {
// is this an inner or outer class?
String obfInnerClassName = new ClassEntry(Descriptor.toJvmName(c.getName())).getSimpleName();
String obfOuterClassName = m_jarIndex.getOuterClass(obfInnerClassName);
if (obfOuterClassName == null) {
// this is an outer class
obfOuterClassName = Descriptor.toJvmName(c.getName());
} else {
// this is an inner class, rename it to outer$inner
ClassEntry obfClassEntry = new ClassEntry(obfOuterClassName + "$" + obfInnerClassName);
c.setName(obfClassEntry.getName());
BehaviorEntry caller = m_jarIndex.getAnonymousClassCaller(obfInnerClassName);
if (caller != null) {
// write the enclosing method attribute
if (caller.getName().equals("<clinit>")) {
c.getClassFile().addAttribute(new EnclosingMethodAttribute(c.getClassFile().getConstPool(), caller.getClassName()));
} else {
c.getClassFile().addAttribute(new EnclosingMethodAttribute(c.getClassFile().getConstPool(), caller.getClassName(), caller.getName(), caller.getSignature().toString()));
}
}
}
// write the inner classes if needed
Collection<String> obfInnerClassNames = m_jarIndex.getInnerClasses(obfOuterClassName);
if (obfInnerClassNames != null && !obfInnerClassNames.isEmpty()) {
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 + "$" + obfInnerClassName);
// 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),
Constants.NonePackage + "/" + obfInnerClassName,
obfClassEntry.getName()
));
*/
// make sure the outer class references only the new inner class names
c.replaceClassName(Constants.NonePackage + "/" + obfInnerClassName, obfClassEntry.getName());
}
}
}
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