Help With Fireball with one charge.

Hi, I was playing around with the skill.dll in mabinogi and i think i found something related to fireball without the 5 charges, i know there's a version released already but i like to figure how things work out by myself. :)

So... anyways i don't understand this part

Quote:

text:100432B2 test al, al

i know its somehow testing/comparing something. can i just change test to NOP or JMP. I'm new to this so sorry if it doesn't make much sense.

and...

Quote:

cmp al, 5

it's defiantly testing something. Al could be the storage of something and the 5 must be how much you need to cast right? :D

anyways I'd like it if you could help me out or just push (not spoon-feed) me in the right direction

You almost have it. Just use your brain. Think think.

The function of Test for you direct from the art of assembly book:

Another important use of the test instruction is to efficiently compare a register against zero. The following test instruction sets the zero flag if and only if ax contains zero (anything anded with itself produces its original value; this sets the zero flag only if that value is zero):




test ax, ax


As for what CMP does is it compares the value of the al register to 5, usually followed by a jump if that value matches.

You do seem to be really close though, this is some of the easier ASM to understand.

Look at the line directly below the CMP line, it'll be Jump IF condition is met.

You just want to jump regardless of any condition.

Ok so i know now that AL = 0. so I looked around a little more and found another register, which is AH. I googles and i found

Quote:

test ah, 5

(AH contains the high byte of AX?)<-- kinda don't get that.

And looked a little deeper to find out that AX is a General-Purpose Register, which is mostly used for calculations and for input/output (so this must be the input for the user(me)) below that is a JP (It jumps if there is parity or if the parity is even?) so I pretty much get the function (i think) now i should fill it with NOP's but i don't know how to do it on IDA... can someone help with that part please? Thanks in advance.

Quote:

Originally Posted by wossen Ok so i know now that AL = 0. so I looked around a little more and found another register, which is AH. I googles and i found (AH contains the high byte of AX?)<-- kinda don't get that. And looked a little deeper to find out that AX is a General-Purpose Register, which is mostly used for calculations and for input/output (so this must be the input for the user(me)) below that is a JP (It jumps if there is parity or if the parity is even?) so I pretty much get the function (i think) now i should fill it with NOP's but i don't know how to do it on IDA... can someone help with that part please? Thanks in advance.

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We are starting to get more Coders and less Leechers. :D

Quote:

Originally Posted by Dark Raccoon We are starting to get more Coders and less Leechers. :D

I think we're getting more coders and even more leechers o.o...

Quote:

Originally Posted by Dark Raccoon We are starting to get more Coders and less Leechers. :D

QFT
but I'm still a leecher :<

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Quote:

Originally Posted by Dark Raccoon We are starting to get more Coders and less Leechers. :D

And the same amount of Lurkers!

Where's that Checkerbox fellow, he's probably lurking too.

I've still yet to contribute since I more or less just watch to see what's happening, I don't even PE, it's lame.

Quote:

Originally Posted by Kefkai And the same amount of Lurkers! Where's that Checkerbox fellow, he's probably lurking too. I've still yet to contribute since I more or less just watch to see what's happening, I don't even PE, it's lame.

And more people getting a clue.

#Closed, Guide was posted.