public void deobfuscate(ScopeBlock scopeBlock)
{
while (true) {
var switchObfuscationInfo = new SwitchObfuscationInfo((instr) => getLocalVar(instr));
if (!findSwitchObfuscation(scopeBlock, switchObfuscationInfo))
break;
switchObfuscationInfo.fixSwitchBranches(scopeBlock);
scopeBlock.removeDeadBlocks(new List<Block>(switchObfuscationInfo.SwitchTargetBlocks));
scopeBlock.mergeBlocks();
}
}
bool findSwitchObfuscation(ScopeBlock scopeBlock, SwitchObfuscationInfo switchObfuscationInfo)
{
foreach (var bb in scopeBlock.getBaseBlocks()) {
var block = bb as Block;
if (block == null || foundBlocks.ContainsKey(block))
continue;
if (block.Instructions.Count != 2 || !block.Instructions[0].isLdloc() || block.Instructions[1].OpCode != OpCodes.Switch)
continue;
switchObfuscationInfo.switchBlock = block;
switchObfuscationInfo.stateVar = getLocalVar(block.Instructions[0]);
var typeName = switchObfuscationInfo.stateVar.VariableType.FullName;
if (typeName != "System.Int32" && typeName != "System.UInt32")
continue;
foundBlocks[block] = true;
return true;
}
return false;
}
