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Unexpected value after mov

 
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thefreestyle
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PostPosted: Sat May 02, 2020 11:28 am    Post subject: Unexpected value after mov Reply with quote
Hi everybody,

Something probably simple but i cant figure this out.

I found address that i want to change, it has one one of 2 values (in 4 bytes) 256 \ 257

When i do :
Code:
mov [rsi+00002705],(int) 257


The value eventually seen as 65792. If ill take calculator and put this number as decimal, the hex value is 10100, which is not exactly what i want. The correct hex value suppose to be 101 = 257 (DEC).
I found another op code that is original to game and it writes the value this way:
Code:
mov [rcx],dil


If i change the value manually at the address to 257 then i get expected result.
What am i missing here ?

Thanks,
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ParkourPenguin
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PostPosted: Sat May 02, 2020 2:12 pm    Post subject: Reply with quote
Change 00002705 to 00002704
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thefreestyle
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PostPosted: Sat May 02, 2020 2:22 pm    Post subject: Reply with quote
ParkourPenguin wrote:
Change 00002705 to 00002704


Works !

can you explain why?

Thanks a lot,
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ParkourPenguin
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PostPosted: Sat May 02, 2020 3:45 pm    Post subject: Reply with quote
It was probably a typo. You meant to press "4" but you accidentally pressed "5".

Or it's not a 4-byte value and the debugger gets confused because you said it is.

If you're wondering about the binary format of integers, they're stored as sums of nonnegative powers of 2 with bytes in little endian order. This is more or less a fancy way of saying hexadecimal in reverse byte order.
e.g. the 4 byte value 0x1234ABCD gets stored as the bytes CD AB 34 12 (in that order).
In your case, you want to set a value to 0x101, but you specified the address wrong:
Code:
00 01 00 00
^^ the start of the actual value
00 01 00 00
   ^^ the address you were writing to

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