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Little pointer problem (MASM)

 
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Sean1337
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Joined: 04 May 2007
Posts: 478
PostPosted: Mon Aug 06, 2007 1:43 am    Post subject: Little pointer problem (MASM) Reply with quote
Alright here's the scenario.

FROM CE:
ecx, [eax]
eax, [ecx+24]
movzx edx, byte ptr [eax+1234]
cmp byte ptr [edx+eax+1235], 09

I'm trying to get pointer for [edx+eax+1235].

So here's what I know.

I have the pointer for ecx (static).

So follow the code.

I got, [pointer+24] = eax
then, [eax+1234] = edx
then, edx+eax+1235 is the pointer I want.

[eax+1234] is a 2 level pointer. Basically code should be like this.

Code:

mov   eax, pointer
mov   eax, [eax]
add   eax, 0024h
mov   eax, [eax] ;after this instruction, eax should contain the value of pointer + 24.
      
push eax
   add eax, 1234h ;2nd level, add 1234 to the value of pointer + 24.
   mov eax, [eax] ;move value of 2nd level pointer into eax
   mov ecx, eax ;save eax into ecx
pop eax
add eax, 1235h ;add 1235 to value of pointer + 24
add eax, ecx ;add value in edx
mov dword ptr ds:[eax],0 ;move 0 into pointer [edx+eax+1235]


I'm not sure whether I did it correctly, but my goal is so that the last line mov [eax], 0 moves 0 into [edx+eax+1235]
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assaf84
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Joined: 03 Oct 2006
Posts: 238
PostPosted: Mon Aug 06, 2007 11:59 pm    Post subject: Reply with quote
It looks just fine.. Do u have any problems using it?
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TheSorc3r3r
I post too much
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Joined: 06 Sep 2006
Posts: 2404
PostPosted: Tue Aug 07, 2007 5:46 am    Post subject: Reply with quote
Code:
mov byte ptr [eax+edx+1235], 0

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Don't laugh, I'm still learning photoshop!
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