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How to move bytes into a register rather than 4 byte values?

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rog9001
Expert Cheater

Reputation: 2

Joined: 22 Dec 2015
Posts: 214
Location: Jupiter

Posted: Tue Aug 23, 2016 10:28 am Post subject: How to move bytes into a register rather than 4 byte values?

so for example I have this:

Code:

mov [edx+00000340],ecx

This address contains the amount of special ability me and my opponent have. When looking at the values in 4 bytes its always some massive number like "1348304088" or something like that, when looking at the value in float/double it goes from + value to - value and from that - value to + value. But when looking at the values in bytes then it mostly is, no special ability = 0 and after that it goes up (9, 14, 28, 32, 37, 44, 58 etc.). sometimes it does go up and down (58, 64, 60, 68, 72, 69, 77 etc.). I noticed that the highest value in bytes is 175 - 200, I figured that the byte lvl would be the easiest to work with. I want to move bytes into the [edx+00000340] rather then a float or a 4 byte value. How do I do this? do I need to do something like:

Code:

mov cx,FF
mov [edx+00000340],cx

or

mov ch,FF
mov [edx+00000340],ch

or

mov cl,FF
mov [edx+00000340],cl

ulysse31
Master Cheater

Reputation: 2

Joined: 19 Mar 2015
Posts: 324
Location: Paris

Posted: Tue Aug 23, 2016 11:05 am Post subject:

Code:

mov cl,FF
mov [edx+00000340],cl

This should do what you want. It will only change the last byte, so if [edx+00000340] held 0xffffffff, 0xffffff will remain unchanged.

If you want to have zero padding you can use movzx
MOVZX moves an unsigned value into a register and zero-extends it with zero.

rog9001
Expert Cheater

Reputation: 2

Joined: 22 Dec 2015
Posts: 214
Location: Jupiter

Posted: Tue Aug 23, 2016 11:28 am Post subject:

ulysse31 wrote:

Code:

mov cl,FF
mov [edx+00000340],cl

thanks for the help. I could never figure out when to use cl (al, dl etc.) and when to use ch (ah, dh etc.).

I wrote my script like this:

Code:

push eax
mov al,FF
mov [edx+00000340],al
pop eax

Zanzer
I post too much

Reputation: 126

Joined: 09 Jun 2013
Posts: 3278

Posted: Tue Aug 23, 2016 6:03 pm Post subject:

Code:

mov byte ptr [edx+00000340],FF

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