From 2d5f3a9848da6b69272c4a85aca6265c694a8936 Mon Sep 17 00:00:00 2001
From: jochen <jochen@379699f6-c40d-0410-875b-85095c16579e>
Date: Sat, 13 Mar 1999 00:00:52 +0000
Subject: [PATCH] deobfuscate strings

git-svn-id: https://svn.code.sf.net/p/jode/code/trunk@408 379699f6-c40d-0410-875b-85095c16579e
---
 jode/jode/expr/ComplexExpression.java |  9 ++++++-
 jode/jode/expr/InvokeOperator.java    | 39 ++++++++++++++++++++++++++-
 2 files changed, 46 insertions(+), 2 deletions(-)

diff --git a/jode/jode/expr/ComplexExpression.java b/jode/jode/expr/ComplexExpression.java
index 4481432..18246e4 100644
--- a/jode/jode/expr/ComplexExpression.java
+++ b/jode/jode/expr/ComplexExpression.java
@@ -418,7 +418,14 @@ public class ComplexExpression extends Expression {
                 return new ComplexExpression
                     (new StringAddOperator(), new Expression[] 
 		     { left, right });
-            }
+            } else if (Decompiler.stringDecrypting) {
+		Expression expr = subExpressions[0].simplifyString();
+		if (expr instanceof ConstOperator) {
+		    expr = invoke.deobfuscateString((ConstOperator)expr);
+		    if (expr != null)
+			return expr;
+		}
+	    }
         }
         return this;
     }
diff --git a/jode/jode/expr/InvokeOperator.java b/jode/jode/expr/InvokeOperator.java
index bc2ff54..fe5df17 100644
--- a/jode/jode/expr/InvokeOperator.java
+++ b/jode/jode/expr/InvokeOperator.java
@@ -19,9 +19,12 @@
 
 package jode.expr;
 import jode.decompiler.CodeAnalyzer;
+import jode.decompiler.ClassAnalyzer;
 import jode.MethodType;
+import jode.Decompiler;
 import jode.Type;
-import jode.bytecode.ClassInfo;
+import jode.bytecode.*;
+import jode.jvm.*;
 
 public final class InvokeOperator extends Operator 
     implements MatchableOperator {
@@ -168,6 +171,40 @@ public final class InvokeOperator extends Operator
 	    .getMethod(methodName, methodType).isGetClass();
     }
 
+    public ConstOperator deobfuscateString(ConstOperator op) {
+	if (!isThis() || !isStatic()
+	    || methodType.getParameterTypes().length != 1
+	    || !methodType.getParameterTypes()[0].equals(Type.tString)
+	    || !methodType.getReturnType().equals(Type.tString))
+	    return null;
+	ClassAnalyzer clazz = codeAnalyzer.getClassAnalyzer();
+	CodeAnalyzer ca = clazz.getMethod(methodName, methodType).getCode();
+	if (ca == null)
+	    return null;
+	CodeInfo info = ca.getCodeInfo();
+	Value[] locals = new Value[info.getMaxLocals()];
+	for (int i=0; i< locals.length; i++)
+	    locals[i] = new Value();
+	Value[] stack = new Value[info.getMaxStack()];
+	for (int i=0; i< stack.length; i++)
+	    stack[i] = new Value();
+	locals[0].setObject(op.getValue());
+	String result;
+	try {
+	    result = (String) Interpreter.interpretMethod
+		(clazz, info.getCode(), locals, stack);
+	} catch (InterpreterException ex) {
+	    Decompiler.err.println("Warning: Can't interpret method "
+				   +methodName);
+	    ex.printStackTrace(Decompiler.err);
+	    return null;
+	} catch (ClassFormatException ex) {
+	    ex.printStackTrace(Decompiler.err);
+	    return null;
+	}
+	return new ConstOperator(Type.tString, result);
+    }
+
     /* Invokes never equals: they may return different values even if
      * they have the same parameters.
      */