Help/Support I need help converting an unsigned int into a signed int in Ida Pro (Android ARM binary)

[xoashley 4.9k none none]

I am using Nox Emulator since I do not have an Android device (Nox is Android version 7)

I've tried to make a free modified ipa and a free modified android apk for the app Kim Kardashian:Hollywood (the ipa is done as of this moment but I need a lot of help with the android one)

Loaded the binary of the APK in Ida Pro and wanted to get to the offset where I can change the cost of an item in the game (here is the source I got it from https://apkpure.com/kim-kardashian-hollywood/com.glu.stardomkim)

I've been trying to modify the offset of function "CustomizeUI_GetOptionCost" I tried doing a negative number then I realized it is an unsigned integer *sigh*

Here is what the offset looks like below for those who are wondering:

; CustomizeUI_GetOptionCost(SSceneManager *, SCustomCharOption const&, unsigned int, unsigned int *, int *)
j__Z25CustomizeUI_GetOptionCostP13SSceneManagerRK17SCustomCharOptionjPjPi
ADRL            R12, 0x69C0F8
LDR             PC, [R12,#(_Z25CustomizeUI_GetOptionCostP13SSceneManagerRK17SCustomCharOptionjPjPi_ptr - 0x69C0F8)]! ; CustomizeUI_GetOptionCost(SSceneManager *,SCustomCharOption const&,uint,uint *,int *)
; End of function CustomizeUI_GetOptionCost(SSceneManager *,SCustomCharOption const&,uint,uint *,int *)

 

So then I did some investigating ~ I xref to 0x69C0F8 and get this result from the first xref

 

.text:005B14C0                 MOV             R3, R2
.text:005B14C2                 MOV             R2, R1
.text:005B14C4                 MOV             R1, R0
.text:005B14C6                 LDR             R0, =(strtoumax_ptr - 0x5B14CC)
.text:005B14C8                 ADD             R0, PC  ; strtoumax_ptr
.text:005B14CA                 LDR             R0, [R0] ; strtoumax
.text:005B14CC                 B.W             loc_5B13C8
.text:005B14CC ; ---------------------------------------------------------------------------
.text:005B14D0 off_5B14D0      DCD strtoumax_ptr - 0x5B14CC

NOPd the entirety of strtoumax_ptr and all the xrefs that contained it ~ noping it didn't help at all it made the cost of an item the maximum value of an unsigned integer which is interesting but not what I wanted at all

I would like to make the cost of the items to a negative number instead (any negative number even -1)

I really would like a helping hand for this ~ thanks in advance  

[s.h.e 946 Galaxy note 3 Idrk]

 Use a cast. int a = 6; unsigned int b; int c; b = (unsigned int)a; c = (int)b; 

I oml you already solved it though lol

Updated July 4, 2021 by Peachxx_101