1 files changed, 132 insertions, 0 deletions

diff --git a/src/cuchaz/enigma/bytecode/InnerClassWriter.java b/src/cuchaz/enigma/bytecode/InnerClassWriter.java
new file mode 100644
index 0000000..bdb1b5d
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+++ b/src/cuchaz/enigma/bytecode/InnerClassWriter.java
@@ -0,0 +1,132 @@
+/*******************************************************************************
+ * Copyright (c) 2015 Jeff Martin.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the GNU Lesser General Public
+ * License v3.0 which accompanies this distribution, and is available at
+ * http://www.gnu.org/licenses/lgpl.html
+ * 
+ * Contributors:
+ *     Jeff Martin - initial API and implementation
+ ******************************************************************************/
+package cuchaz.enigma.bytecode;
+
+import java.util.Collection;
+import java.util.List;
+
+import com.google.common.collect.Lists;
+
+import javassist.CtClass;
+import javassist.bytecode.AccessFlag;
+import javassist.bytecode.ConstPool;
+import javassist.bytecode.EnclosingMethodAttribute;
+import javassist.bytecode.InnerClassesAttribute;
+import cuchaz.enigma.analysis.JarIndex;
+import cuchaz.enigma.mapping.BehaviorEntry;
+import cuchaz.enigma.mapping.ClassEntry;
+import cuchaz.enigma.mapping.EntryFactory;
+
+public class InnerClassWriter {
+        
+        private JarIndex m_index;
+        
+        public InnerClassWriter(JarIndex index) {
+                m_index = index;
+        }
+        
+        public void write(CtClass c) {
+                
+                // don't change anything if there's already an attribute there
+                InnerClassesAttribute oldAttr = (InnerClassesAttribute)c.getClassFile().getAttribute(InnerClassesAttribute.tag);
+                if (oldAttr != null) {
+                        // bail!
+                        return;
+                }
+                
+                ClassEntry obfClassEntry = EntryFactory.getClassEntry(c);
+                List<ClassEntry> obfClassChain = m_index.getObfClassChain(obfClassEntry);
+                
+                boolean isInnerClass = obfClassChain.size() > 1;
+                if (isInnerClass) {
+                        
+                        // it's an inner class, rename it to the fully qualified name
+                        c.setName(obfClassEntry.buildClassEntry(obfClassChain).getName());
+                        
+                        BehaviorEntry caller = m_index.getAnonymousClassCaller(obfClassEntry);
+                        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()));
+                                }
+                        }
+                }
+                
+                // does this class have any inner classes?
+                Collection<ClassEntry> obfInnerClassEntries = m_index.getInnerClasses(obfClassEntry);
+                
+                if (isInnerClass || !obfInnerClassEntries.isEmpty()) {
+                        
+                        // create an inner class attribute
+                        InnerClassesAttribute attr = new InnerClassesAttribute(c.getClassFile().getConstPool());
+                        c.getClassFile().addAttribute(attr);
+                        
+                        // write the ancestry, but not the outermost class
+                        for (int i=1; i<obfClassChain.size(); i++) {
+                                ClassEntry obfInnerClassEntry = obfClassChain.get(i);
+                                writeInnerClass(attr, obfClassChain, obfInnerClassEntry);
+                                
+                                // update references to use the fully qualified inner class name
+                                c.replaceClassName(obfInnerClassEntry.getName(), obfInnerClassEntry.buildClassEntry(obfClassChain).getName());
+                        }
+                        
+                        // write the inner classes
+                        for (ClassEntry obfInnerClassEntry : obfInnerClassEntries) {
+                                
+                                // extend the class chain
+                                List<ClassEntry> extendedObfClassChain = Lists.newArrayList(obfClassChain);
+                                extendedObfClassChain.add(obfInnerClassEntry);
+                                
+                                writeInnerClass(attr, extendedObfClassChain, obfInnerClassEntry);
+                                
+                                // update references to use the fully qualified inner class name
+                                c.replaceClassName(obfInnerClassEntry.getName(), obfInnerClassEntry.buildClassEntry(extendedObfClassChain).getName());
+                        }
+                }
+        }
+        
+        private void writeInnerClass(InnerClassesAttribute attr, List<ClassEntry> obfClassChain, ClassEntry obfClassEntry) {
+                
+                // get the new inner class name
+                ClassEntry obfInnerClassEntry = obfClassEntry.buildClassEntry(obfClassChain);
+                ClassEntry obfOuterClassEntry = obfInnerClassEntry.getOuterClassEntry();
+                
+                // here's what the JVM spec says about the InnerClasses attribute
+                // append(inner, parent, 0 if anonymous else simple name, flags);
+                
+                // update the attribute with this inner class
+                ConstPool constPool = attr.getConstPool();
+                int innerClassIndex = constPool.addClassInfo(obfInnerClassEntry.getName());
+                int parentClassIndex = constPool.addClassInfo(obfOuterClassEntry.getName());
+                int innerClassNameIndex = 0;
+                int accessFlags = AccessFlag.PUBLIC;
+                // TODO: need to figure out if we can put static or not
+                if (!m_index.isAnonymousClass(obfClassEntry)) {
+                        innerClassNameIndex = constPool.addUtf8Info(obfInnerClassEntry.getInnermostClassName());
+                }
+                
+                attr.append(innerClassIndex, parentClassIndex, innerClassNameIndex, accessFlags);
+                
+                /* DEBUG 
+                System.out.println(String.format("\tOBF: %s -> ATTR: %s,%s,%s (replace %s with %s)",
+                        obfClassEntry,
+                        attr.innerClass(attr.tableLength() - 1),
+                        attr.outerClass(attr.tableLength() - 1),
+                        attr.innerName(attr.tableLength() - 1),
+                        Constants.NonePackage + "/" + obfInnerClassName,
+                        obfClassEntry.getName()
+                ));
+                */
+        }
+}