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lontongmalam
Newbie cheater

Reputation: 0

Joined: 13 Apr 2022
Posts: 17

Posted: Mon Nov 20, 2023 7:16 am Post subject: Random Number In Range

Hello everyone,

I need some help. I want to generate a random number between two given values.

Here are the details:

Quote:

[r14+000001FC] -> Contains min range

[r14+000001FE] -> Contains max range

The max value is 200. For example:

Quote:

[r14+000001FC] -> 78

[r14+000001FE] -> 192

I want to make it somehow like this:

Quote:

[r14+000001FC] -> 133

[r14+000001FE] -> 192

Thank you!

LeFiXER
Grandmaster Cheater Supreme

Reputation: 20

Joined: 02 Sep 2011
Posts: 1069
Location: 0x90

Posted: Mon Nov 20, 2023 9:31 am Post subject:

You can just simply use a register to set the value of [r14+1FC] like so:

Code:

...
push rbx // Store what's held in RBX
mov rbx,#133 // Move int 133 into RBX
mov [r14+1FC],rbx // Move the value held in RBX to [r14+1FC]
pop rbx // Restore value that was held in RBX before we used it
...

lontongmalam
Newbie cheater

Reputation: 0

Joined: 13 Apr 2022
Posts: 17

Posted: Mon Nov 20, 2023 9:39 am Post subject:

LeFiXER wrote:

You can just simply use a register to set the value of [r14+1FC] like so:

Code:

Thanks for the reply.

However, it is expected to be a randomly generated number between 78 and 192, rather than the fixed one. That above is my example of the result.

AylinCE
Grandmaster Cheater Supreme

Reputation: 37

Joined: 16 Feb 2017
Posts: 1526

Posted: Mon Nov 20, 2023 11:55 am Post subject:

Ridiculous or ordinary ..
There must be similar ideas ..

Code:

{$lua}
local num = math.random(78,192)
local res = "#"..tonumber(num)

{$asm}
push rbx // Store what's held in RBX
mov rbx,res // #133 Move int 133 into RBX
mov [r14+1FC],rbx // Move the value held in RBX to [r14+1FC]
pop rbx

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lontongmalam
Newbie cheater

Reputation: 0

Joined: 13 Apr 2022
Posts: 17

Posted: Mon Nov 20, 2023 12:25 pm Post subject:

AylinCE wrote:

Ridiculous or ordinary ..
There must be similar ideas ..

Code:

I can do that in lua, but I need assembly codes as it would run faster.
Also, you need to get the min, max value from r14.

I think I found a topic similiar like this, but I have no idea how to change that into my request.

cheatengine*org/forum/viewtopic.php?p=5638667&sid=f4105b9b0798d0924764843446ddfef2

Last edited by lontongmalam on Mon Nov 20, 2023 12:29 pm; edited 1 time in total

ParkourPenguin
I post too much

Reputation: 152

Joined: 06 Jul 2014
Posts: 4706

Posted: Mon Nov 20, 2023 12:28 pm Post subject:

lontongmalam wrote:

The max value is 200. For example:

Quote:

[r14+000001FC] -> 78

[r14+000001FE] -> 192

Where's the 200?

lontongmalam wrote:

Quote:

[r14+000001FC] -> Contains min range

[r14+000001FE] -> Contains max range

...
I want to make it somehow like this:

Quote:

[r14+000001FC] -> 133

[r14+000001FE] -> 192

You want to change the minimum value to be a random value? That's just going to converge to the max value every iteration.

Give more information regarding what you want to do.
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lontongmalam
Newbie cheater

Reputation: 0

Joined: 13 Apr 2022
Posts: 17

Posted: Mon Nov 20, 2023 12:33 pm Post subject:

ParkourPenguin wrote:

lontongmalam wrote:

The max value is 200. For example:

Quote:

[r14+000001FC] -> 78

[r14+000001FE] -> 192

Where's the 200?

lontongmalam wrote:

Quote:

[r14+000001FC] -> Contains min range

[r14+000001FE] -> Contains max range

...
I want to make it somehow like this:

Quote:

[r14+000001FC] -> 133

[r14+000001FE] -> 192

You want to change the minimum value to be a random value? That's just going to converge to the max value every iteration.

Give more information regarding what you want to do.

Yes, I want give a new value to [r14+1FC] based on what number between [r14+1FC] and [r14+1FE]. And it should be not greater than [r14+1FE].

Like this:

Code:

{$lua}
local a = readByte(num+0x1FC)
local b = readByte(num+0x1FE)
writeByte(num+0x1FC, math.random(a,b))

{$asm}
mov [num],r14

num:
dq 0

But it really slowdown the process, that's why I want these codes in asm, like fully asm.

ParkourPenguin
I post too much

Reputation: 152

Joined: 06 Jul 2014
Posts: 4706

Posted: Mon Nov 20, 2023 1:07 pm Post subject:

lontongmalam wrote:

Yes, I want give a new value to [r14+1FC] based on what number between [r14+1FC] and [r14+1FE]. And it should be not greater than [r14+1FE].

That's just going to converge to the maximum value. There would no longer be any randomness after a few iterations.

Code:

low - high -> rand_val

1: 10 - 100 -> 69
2: 69 - 100 -> 88
3: 88 - 100 -> 98
4: 98 - 100 -> 100
5: 100 - 100 -> 100
6: 100 - 100 -> 100
...

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AylinCE
Grandmaster Cheater Supreme

Reputation: 37

Joined: 16 Feb 2017
Posts: 1526

Posted: Mon Nov 20, 2023 1:23 pm Post subject:

ParkourPenguin wrote:

[quote=That's just going to converge to the maximum value. There would no longer be any randomness after a few iterations.

The "[r14+1FC] and [r14+1FE]" values may be constantly changing during the game.
In other words, arbitrary value assignment is only possible if the script is enabled, if it is not tied to a timer.
And if not disabled it may be getting fixed to random value.
_________________

ParkourPenguin
I post too much

Reputation: 152

Joined: 06 Jul 2014
Posts: 4706

Posted: Mon Nov 20, 2023 1:42 pm Post subject:

Alright.

There's probably some `int rand(void)` function exported by some dll; try to use that.

Code:

[ENABLE]
...
{$c}
extern int rand(void);

int randbetween(int low, int high) {
return rand() % (high - low + 1) + low;
}
{$asm}

...

newmem:
{$ccode ptr=r12}
char *data = (char *)ptr;

const short *minp = (short *)(data + 0x1FC);
const short *maxp = (short *)(data + 0x1FE);

*minp = randbetween(*minp, *maxp);
{$asm}
...

[DISABLE]
...

{$ccode} is probably fast enough. It's basically assembly.
If not, go implement your own random number genrator.
_________________

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lontongmalam
Newbie cheater

Reputation: 0

Joined: 13 Apr 2022
Posts: 17

Posted: Mon Nov 20, 2023 2:10 pm Post subject:

ParkourPenguin wrote:

Alright.

There's probably some `int rand(void)` function exported by some dll; try to use that.

Code:

{$ccode} is probably fast enough. It's basically assembly.
If not, go implement your own random number genrator.

Thanks, I tried to make it like this, I think it similiar:

Code:

push rax
push rdx
push rbx
push r10

xor r10,r10
xor rbx,rbx

rdtsc

xor edx,edx

mov bl,[r14+1FE]
mov r10b,[r14+1FC]
sub bl,r10b
inc bl
div ebx // edx is the remainder
add dl,r10b
mov byte ptr [r14+1FC],dl

pop r10
pop rbx
pop rdx
pop rax

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