/*
Copyright (C) 2011-2012 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;
using System.Collections.Generic;
using dot10.DotNet;
using dot10.DotNet.Emit;
using de4dot.blocks;
using de4dot.code.renamer.asmmodules;
namespace de4dot.code.renamer {
class ResourceRenamer {
Module module;
Dictionary nameToResource;
public ResourceRenamer(Module module) {
this.module = module;
}
public void rename(List renamedTypes) {
// Rename the longest names first. Otherwise eg. b.g.resources could be renamed
// Class0.g.resources instead of Class1.resources when b.g was renamed Class1.
renamedTypes.Sort((a, b) => b.oldFullName.Length.CompareTo(a.oldFullName.Length));
nameToResource = new Dictionary(module.ModuleDefMD.Resources.Count * 3, StringComparer.Ordinal);
foreach (var resource in module.ModuleDefMD.Resources) {
var name = resource.Name.String;
nameToResource[name] = resource;
if (name.EndsWith(".g.resources"))
nameToResource[name.Substring(0, name.Length - 12)] = resource;
int index = name.LastIndexOf('.');
if (index > 0)
nameToResource[name.Substring(0, index)] = resource;
}
renameResourceNamesInCode(renamedTypes);
renameResources(renamedTypes);
}
void renameResourceNamesInCode(List renamedTypes) {
var oldNameToTypeInfo = new Dictionary(StringComparer.Ordinal);
foreach (var info in renamedTypes)
oldNameToTypeInfo[info.oldFullName] = info;
foreach (var method in module.getAllMethods()) {
if (!method.HasBody)
continue;
var instrs = method.Body.Instructions;
for (int i = 0; i < instrs.Count; i++) {
var instr = instrs[i];
if (instr.OpCode != OpCodes.Ldstr)
continue;
var codeString = (string)instr.Operand;
if (string.IsNullOrEmpty(codeString))
continue;
Resource resource;
if (!nameToResource.TryGetValue(codeString, out resource))
continue;
TypeInfo typeInfo;
if (!oldNameToTypeInfo.TryGetValue(codeString, out typeInfo))
continue;
var newName = typeInfo.type.TypeDef.FullName;
bool renameCodeString = module.ObfuscatedFile.RenameResourcesInCode ||
isCallingResourceManagerCtor(instrs, i, typeInfo);
if (!renameCodeString)
Log.v("Possible resource name in code: '{0}' => '{1}' in method {2}", Utils.removeNewlines(codeString), newName, Utils.removeNewlines(method));
else {
instr.Operand = newName;
Log.v("Renamed resource string in code: '{0}' => '{1}' ({2})", Utils.removeNewlines(codeString), newName, Utils.removeNewlines(method));
}
}
}
}
static bool isCallingResourceManagerCtor(IList instrs, int ldstrIndex, TypeInfo typeInfo) {
try {
int index = ldstrIndex + 1;
var ldtoken = instrs[index++];
if (ldtoken.OpCode.Code != Code.Ldtoken)
return false;
if (!new SigComparer().Equals(typeInfo.type.TypeDef, ldtoken.Operand as ITypeDefOrRef))
return false;
if (!checkCalledMethod(instrs[index++], "System.Type", "(System.RuntimeTypeHandle)"))
return false;
if (!checkCalledMethod(instrs[index++], "System.Reflection.Assembly", "()"))
return false;
var newobj = instrs[index++];
if (newobj.OpCode.Code != Code.Newobj)
return false;
if (newobj.Operand.ToString() != "System.Void System.Resources.ResourceManager::.ctor(System.String,System.Reflection.Assembly)")
return false;
return true;
}
catch (ArgumentOutOfRangeException) {
return false;
}
catch (IndexOutOfRangeException) {
return false;
}
}
static bool checkCalledMethod(Instruction instr, string returnType, string parameters) {
if (instr.OpCode.Code != Code.Call && instr.OpCode.Code != Code.Callvirt)
return false;
return DotNetUtils.isMethod(instr.Operand as IMethod, returnType, parameters);
}
class RenameInfo {
public Resource resource;
public TypeInfo typeInfo;
public string newResourceName;
public RenameInfo(Resource resource, TypeInfo typeInfo, string newResourceName) {
this.resource = resource;
this.typeInfo = typeInfo;
this.newResourceName = newResourceName;
}
public override string ToString() {
return string.Format("{0} => {1}", resource.Name, newResourceName);
}
}
void renameResources(List renamedTypes) {
var newNames = new Dictionary();
foreach (var info in renamedTypes) {
var oldFullName = info.oldFullName;
Resource resource;
if (!nameToResource.TryGetValue(oldFullName, out resource))
continue;
if (newNames.ContainsKey(resource))
continue;
var newTypeName = info.type.TypeDef.FullName;
var newName = newTypeName + resource.Name.String.Substring(oldFullName.Length);
newNames[resource] = new RenameInfo(resource, info, newName);
Log.v("Renamed resource in resources: {0} => {1}", Utils.removeNewlines(resource.Name), newName);
resource.Name = new UTF8String(newName);
}
}
}
}