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Need some help to "special" freeze a value

 
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Kulturbanause
How do I cheat?
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Joined: 19 May 2009
Posts: 3

PostPosted: Fri Jul 27, 2018 1:23 pm    Post subject: Need some help to "special" freeze a value Reply with quote

Hi Community,

I want to freeze a value of an adress in a special way.

I know you can freeze a value, you can freeze it to allow increase and you can freeze it to allow decrease. Standard functions of CE.

What I want is to freeze this value to for example 10000 and make it possible to allow increase and decrease above 10000. But the value should never decrease below 10000.
This 10000 should act as a boundary. All values above this value should be possible but a decrease below 10000 should not be possible.

How to achieve this?

BR
Kulturbanause
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TheyCallMeTim13
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Joined: 24 Feb 2017
Posts: 976
Location: Pluto

PostPosted: Fri Jul 27, 2018 2:28 pm    Post subject: Reply with quote

Find out where the value is written to, and compare it to your freeze value to see if you will allow it to set the value.

https://wiki.cheatengine.org/index.php?title=Tutorials:Auto_Assembler:Injection_full

Here is an example script.
Code:


{$STRICT}

define(address, mgsvtpp.exe+3E883F4)
define(bytes, 89 07 80 8B 88 0E 00 00 05)

////
//// ------------------------------ ENABLE ------------------------------
[ENABLE]
aobScanModule(aobGmpWrtHook, mgsvtpp.exe, 48xxxxxxxxxxxx89xx44xxxx44xxxx3Dxxxxxxxx7Cxx44xxxx7Fxx89xx80xxxxxxxxxxxx48xxxxxxxx48xxxxxxxxxx)
define(injGmpWrtHook, aobGmpWrtHook+1B)
assert(injGmpWrtHook, bytes)
registerSymbol(injGmpWrtHook)

alloc(memGmpWrtHook, 0x400, injGmpWrtHook)

label(intGmpWrtHook)
registerSymbol(intGmpWrtHook)

label(ptrGmpWrtHook)
registerSymbol(ptrGmpWrtHook)

label(n_code)
label(o_code)
label(exit)
label(return)

memGmpWrtHook:
   intGmpWrtHook:
      dd (int)50000
   ptrGmpWrtHook:
      dq 0
   align 10 CC
   n_code:
      pushfq
      mov [ptrGmpWrtHook],rdi
      push rcx
      mov ecx,[intGmpWrtHook] // move freeze value to ECX
      cmp [rdi],ecx // compare GMP (money) to freeze value
      jge @f // jump if GMP is greater then freeze value
         mov eax,ecx // set new value to freeze value
      @@:
      pop rcx
      cmp [rdi],eax // cmp new value with GMP
      jle @f // jump if GMP is less than new value.
         mov eax,[rdi] // set new value to current value (freeze value)
      @@:
      popfq
   o_code:
      mov [rdi],eax
      or byte ptr [rbx+00000E88],05
   exit:
      jmp return


////
//// ---------- Injection Point ----------
injGmpWrtHook:
   jmp n_code
   nop
   nop
   nop
   nop
   return:


////
//// ------------------------------ DISABLE ------------------------------
[DISABLE]
////
//// ---------- Injection Point ----------
injGmpWrtHook:
   db bytes

unregisterSymbol(injGmpWrtHook)

unregisterSymbol(intGmpWrtHook)

unregisterSymbol(ptrGmpWrtHook)

dealloc(memGmpWrtHook)

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FreeER
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Joined: 09 Aug 2013
Posts: 1091

PostPosted: Fri Jul 27, 2018 3:49 pm    Post subject: Reply with quote

either hook code that accesses it and use assembly to compare it to your min value and if it's less set it to the min, otherwise do nothing/write the original.

Or you can use some lua code to do it, using something like
Code:
{$lua}
[ENABLE]
-- value boundary configuration
local min = 10000
local max = nil

-- start of generic code
local mr = memrec.Parent -- assumes script to freeze is nested under value to freeze
FreezeTimers = FreezeTimers or {}
if syntaxcheck then return end
local t = createTimer()
FreezeTimers[memrec.id] = t
t.Interval = getFreezeTimer().Interval -- use same interval as CE
t.OnTimer = function()
  local value = tonumber(mr.Value, mr.ShowAsHex and 16 or 10)
  if max and value > max then value = max end
  if min and value < min then value = min end
  mr.Value = string.format(mr.ShowAsHex and '0x%X' or '%d', value)
end
[DISABLE]
if syntaxcheck then return end
FreezeTimers[memrec.id].destroy()

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