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2 Questions

 
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kitesan
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Joined: 01 May 2014
Posts: 124
PostPosted: Tue Aug 26, 2014 6:46 pm    Post subject: 2 Questions Reply with quote
i dont understand this

Test eax,eax
je address

why to compare the same value?


is possible to nop a call?
there is some advanced tutorial about advanced codeinjection?
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abystus
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Joined: 09 Dec 2010
Posts: 140
PostPosted: Wed Aug 27, 2014 2:05 am    Post subject: Re: 2 Questions Reply with quote
kitesan wrote:
i dont understand this

Test eax,eax
je address

why to compare the same value?


The Test instruction does a bit-wise AND operation, and sets the zero flag accordingly. The next line is a JE, and will jump if AND(EAX,EAX) = 0 (aka Zero Flag = 1).

kitesan wrote:

is possible to nop a call?


Yes, a Call can be nopped. If it is just a Call with no pushes directly before it, then just nop the Call. If the Call has pushes directly before it, nop the pushes as well as the Call. Depending on what the Call in question does, your modifications may still result in a crash due to the game expecting something to be set correctly within the Call you nopped.

kitesan wrote:

there is some advanced tutorial about advanced codeinjection?


Most likely. Search the forums. Also, Google is your friend.
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