Hi all,
I'm newbie with CIL. I tried to:
- Read a DLL file.
- Iterate all instructions
+ if program encounters add operator, it will change to sub and then save
to a new dll (Add.dll)
+ if program encounters sub operator, it will change to add and then save
to a new dll.(Sub.dll)
My problem is:
- After I run my code, Sub.dll is modified from Add.dll, instead of
original code.
*I. Result I've got :*
1. Original code
public int add(int a,int b) {return a+b;}
public int subtract(int a,int b) {return a-b;}
2. Add.dll
public int add(int a,int b) {return a-b;}
public int subtract (int a,int b) {return a-b;}
3. Subtract.dll
public int add(int a,int b)*{return a-b;} //instead of a+b*
public int subtract(int a,int b){return a+b;}
*II. My code*
var _module = ModuleDefinition.ReadModule(sourceFile);
foreach (TypeDefinition type in _module.Types)
{
if (type.Name != "<Module>")
{
foreach (MethodDefinition method in type.Methods)
{
//omit constructor
if (method.Name != ".ctor")
{
//iterate all instructions in each method
foreach (var instruction in
method.Body.Instructions)
{
if (instruction.OpCode == OpCodes.Add)
{
instruction.OpCode = OpCodes.Sub;
_module.Write("Add.dll");
}
else if (instruction.OpCode ==
OpCodes.Sub)
{
instruction.OpCode = OpCodes.Add;
_module.Write(Sub.dll");
}
Thanks for your time !
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