/*
Copyright (C) 2011-2013 de4dot@gmail.com
This file is part of de4dot.
de4dot is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
de4dot is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with de4dot. If not, see .
*/
using System.Collections.Generic;
using dnlib.DotNet;
using dnlib.DotNet.Emit;
namespace de4dot.blocks.cflow {
// Only deobfuscates a method once. A copy of the method (now deobfuscated) is returned.
public class CachedCflowDeobfuscator {
BlocksCflowDeobfuscator cflowDeobfuscator = new BlocksCflowDeobfuscator();
Dictionary deobfuscated = new Dictionary();
public CachedCflowDeobfuscator() {
}
public CachedCflowDeobfuscator(IEnumerable blocksDeobfuscators) {
add(blocksDeobfuscators);
}
public void add(IEnumerable blocksDeobfuscators) {
foreach (var bd in blocksDeobfuscators)
cflowDeobfuscator.add(bd);
}
public void add(IBlocksDeobfuscator blocksDeobfuscator) {
cflowDeobfuscator.add(blocksDeobfuscator);
}
public MethodDef deobfuscate(MethodDef method) {
MethodDef deobfuscatedMethod;
if (deobfuscated.TryGetValue(method, out deobfuscatedMethod))
return deobfuscatedMethod;
if (method.Body == null || method.Body.Instructions.Count == 0) {
deobfuscated[method] = method;
return method;
}
deobfuscatedMethod = DotNetUtils.clone(method);
deobfuscated[method] = deobfuscatedMethod;
var blocks = new Blocks(deobfuscatedMethod);
deobfuscate(blocks);
IList allInstructions;
IList allExceptionHandlers;
blocks.getCode(out allInstructions, out allExceptionHandlers);
DotNetUtils.restoreBody(deobfuscatedMethod, allInstructions, allExceptionHandlers);
return deobfuscatedMethod;
}
void deobfuscate(Blocks blocks) {
cflowDeobfuscator.init(blocks);
cflowDeobfuscator.deobfuscate();
}
}
}