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Find something to compare in dissected structure

 
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vask0to
How do I cheat?
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Joined: 30 Nov 2013
Posts: 3

PostPosted: Sat Jan 06, 2018 4:49 pm    Post subject: Find something to compare in dissected structure Reply with quote

So I have dissected a structure and got to the point where I could change life of the unit. The thing is that the function is responsible for changing every unit/building life too. So I want to check if the unit has 555 power, and if it has to change its life to some other value otherwise to act normal.

Lets say that the function is rcx+30

So I am asking how to get in to the tree of the structure to get the offsets
Code:
> 0000 something
> 0008 something2
> 0010 something3
> 0018 something4
   > 0000 somethingelse
   > 0008 somethingelse2
   > 0010 somethingelse3
   > 0018 somethingelse4
   ...
   01E0 power  --> 555
0030 life --> 4567

What I want to do is change life if power equals 555

What I've tried is this, but the compare doesn't work. I've tried to find a way to get the offset right but no success...
Code:
code:
  pushf
  cmp [rcx+??],1E // 1E to be the value of rcx+?? ... I am looking for the ??
  jne originalcode
  popf
  mov [rcx+30],FF //unit to be changed to FF lifepoints
  jmp return

originalcode:
  popf
  mov [rcx+30],edx
  mov rdx,[rbp+10]
  jmp return


I am kinda new to assembly, so please don't judge too hard :)
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TheyCallMeTim13
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Joined: 24 Feb 2017
Posts: 161
Location: Right Here Buddy.

PostPosted: Sat Jan 06, 2018 4:56 pm    Post subject: Reply with quote

Code:

> 0018 something4
   > 01E0 power  --> 555
> 0030 life --> 4567

Code:
 
code:
  pushfq
  push rsi
  mov rsi,[rcx+18]
  test rsi,rsi
  jz originalcode
    cmp [rsi+1E0],1E // 1E to be the value of rcx+?? ... I am looking for the ??
    jne originalcode
      pop rsi
      popfq
      mov [rcx+30],FF //unit to be changed to FF lifepoints
      jmp return

originalcode:
  pop rsi
  popfq
  mov [rcx+30],edx
  mov rdx,[rbp+10]
  jmp return

_________________
A: What manner of man are you that can summon up fire without flint or tinder?
T: I... am an enchanter.
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vask0to
How do I cheat?
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Joined: 30 Nov 2013
Posts: 3

PostPosted: Sat Jan 06, 2018 5:09 pm    Post subject: Reply with quote

Thank you a lot. It worked like a charm Smile
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