mirror of
https://github.com/sp-tarkov/assembly-tool.git
synced 2025-02-13 02:30:44 -05:00
71 lines
2.0 KiB
C#
71 lines
2.0 KiB
C#
|
/*
|
||
|
|
Copyright (C) 2011-2015 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 <http://www.gnu.org/licenses/>.
|
||
|
|
*/
|
||
|
|
|
||
|
|
using System.Collections.Generic;
|
||
|
|
using dnlib.DotNet;
|
||
|
|
using dnlib.DotNet.Emit;
|
||
|
|
|
||
|
|
namespace de4dot.blocks.cflow {
|
||
|
|
// Replace stloc + ldloc with dup + stloc
|
||
|
|
class StLdlocFixer : BlockDeobfuscator {
|
||
|
|
IList<Local> locals;
|
||
|
|
|
||
|
|
protected override void Initialize(List<Block> allBlocks) {
|
||
|
|
base.Initialize(allBlocks);
|
||
|
|
locals = blocks.Locals;
|
||
|
|
}
|
||
|
|
|
||
|
|
protected override bool Deobfuscate(Block block) {
|
||
|
|
bool modified = false;
|
||
|
|
var instructions = block.Instructions;
|
||
|
|
for (int i = 0; i < instructions.Count; i++) {
|
||
|
|
var instr = instructions[i];
|
||
|
|
switch (instr.OpCode.Code) {
|
||
|
|
// Xenocode generates stloc + ldloc (bool). Replace it with dup + stloc. It will eventually
|
||
|
|
// become dup + pop and be removed.
|
||
|
|
case Code.Stloc:
|
||
|
|
case Code.Stloc_S:
|
||
|
|
case Code.Stloc_0:
|
||
|
|
case Code.Stloc_1:
|
||
|
|
case Code.Stloc_2:
|
||
|
|
case Code.Stloc_3:
|
||
|
|
if (i + 1 >= instructions.Count)
|
||
|
|
break;
|
||
|
|
if (!instructions[i + 1].IsLdloc())
|
||
|
|
break;
|
||
|
|
var local = Instr.GetLocalVar(locals, instr);
|
||
|
|
if (local.Type.ElementType != ElementType.Boolean)
|
||
|
|
continue;
|
||
|
|
if (local != Instr.GetLocalVar(locals, instructions[i + 1]))
|
||
|
|
break;
|
||
|
|
instructions[i] = new Instr(OpCodes.Dup.ToInstruction());
|
||
|
|
instructions[i + 1] = instr;
|
||
|
|
modified = true;
|
||
|
|
break;
|
||
|
|
|
||
|
|
default:
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return modified;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|