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Add code to initialize arrays

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de4dot 2012-01-03 15:25:25 +01:00
parent 6e80b5bb94
commit d3c801efb6
1 changed files with 27 additions and 0 deletions
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27
de4dot.code/deobfuscators/InitializedDataCreator.cs
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@ -20,6 +20,7 @@
using System;
using System.Collections.Generic;
using Mono.Cecil;
using Mono.Cecil.Cil;
using de4dot.blocks;
namespace de4dot.code.deobfuscators {
@ -29,11 +30,37 @@ namespace de4dot.code.deobfuscators {
TypeDefinition ourType;
TypeReference valueType;
int unique = 0;
MethodReference initializeArrayMethod;
public MethodReference InitializeArrayMethod {
get { return createInitializeArrayMethod(); }
}
public InitializedDataCreator(ModuleDefinition module) {
this.module = module;
}
MethodReference createInitializeArrayMethod() {
if (initializeArrayMethod == null) {
var runtimeHelpersType = DotNetUtils.findOrCreateTypeReference(module, module.TypeSystem.Corlib as AssemblyNameReference, "System.Runtime.CompilerServices", "RuntimeHelpers", false);
initializeArrayMethod = new MethodReference("InitializeArray", module.TypeSystem.Void, runtimeHelpersType);
var systemArrayType = DotNetUtils.findOrCreateTypeReference(module, module.TypeSystem.Corlib as AssemblyNameReference, "System", "Array", false);
var runtimeFieldHandleType = DotNetUtils.findOrCreateTypeReference(module, module.TypeSystem.Corlib as AssemblyNameReference, "System", "RuntimeFieldHandle", true);
initializeArrayMethod.Parameters.Add(new ParameterDefinition(systemArrayType));
initializeArrayMethod.Parameters.Add(new ParameterDefinition(runtimeFieldHandleType));
}
return initializeArrayMethod;
}
public void addInitializeArrayCode(Block block, int start, int numToRemove, TypeReference elementType, byte[] data) {
int index = start;
block.replace(index++, numToRemove, DotNetUtils.createLdci4(data.Length / elementType.PrimitiveSize));
block.insert(index++, Instruction.Create(OpCodes.Newarr, elementType));
block.insert(index++, Instruction.Create(OpCodes.Dup));
block.insert(index++, Instruction.Create(OpCodes.Ldtoken, create(data)));
block.insert(index++, Instruction.Create(OpCodes.Call, InitializeArrayMethod));
}
void createOurType() {
if (ourType != null)
return;