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Check if file exists, file name in memory?
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thethiny
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Joined: 01 Apr 2012
Posts: 38
Location: earth

Posted: Sat Jul 16, 2016 6:57 pm Post subject:

ParkourPenguin wrote:

Now that you mention it, file+100 is probably more than 2GB away from newmem which causes the instruction cmp [BOOL],1 to fail (it's not encodable). Pass it back via a register (i.e. eax) instead, or just put it inline like I suggested.

Yeah I noticed that and I fixed it Very Happy

ParkourPenguin wrote:

I also just now noticed you're swapping rax and rcx by popping them in the wrong order. Elements are accessed from the stack on a last-in-first-out basis.

I also fixed this in the edit.

ParkourPenguin wrote:

If PathFileExists always returns 0, then it's always failing to find the file specified. Try executing my example script in the game but instead of CE's path use '..\Loadr\FileName.txt',0

I got it, the Get Path thingy starts at the root directory, so I don't need the '..\', I fixed this by lea rcx,[DATA+3] instead of DATA

THANK YOU SO MUCH I NOW HAVE A FULLY WORKING DLC LOADER Very Happy

here's the code for those interested:
I expanded it to support 128 characters.

Code:

alloc(newmem,2048,"MK10.exe"+13FF5C4)
alloc(DATA,512)
label(returnhere)
label(originalcode)
label(exit)
label(file)
label(BOOL)
label(X0Backup)

DATA+90:
BOOL:
dd 424F4F4C

DATA+80:
X0Backup:
DB ?

newmem: //this is allocated memory, you have read,write,execute access
//place your code here
movaps [X0Backup],xmm0 //BACKUP XMM0
movaps [DATA],xmm0
movaps xmm1,[rax-70]
movaps [DATA+10],xmm1
//Expand Max Charachter Size
movaps xmm0,[rax-60]
movaps [DATA+20],xmm0
movaps xmm1,[rax-50]
movaps [DATA+30],xmm1
movaps xmm0,[rax-40]
movaps [DATA+40],xmm0
movaps xmm1,[rax-30]
movaps [DATA+50],xmm1
movaps xmm0,[rax-20]
movaps [DATA+60],xmm0
movaps xmm1,[rax-10]
movaps [DATA+70],xmm1

cmp [DATA],'..\A'
jnz originalcode
cmp [DATA+4],'sset'
jnz originalcode
cmp Byte Ptr [DATA+8],'\'
jnz originalcode
mov [DATA+3],'Load'
mov Word Ptr [DATA+7],'r\'

call file //Try to open ..\Loadr\YourFile
cmp [BOOL],1
jnz originalcode

movaps xmm0,[DATA]
movaps xmm1,[DATA+10]
movaps [rdx-80],xmm0
movaps [rdx-70],xmm1
movaps xmm0,[DATA+20]
movaps xmm1,[DATA+30]
movaps [rdx-60],xmm0
movaps [rdx-50],xmm1
movaps xmm0,[DATA+40]
movaps xmm1,[DATA+50]
movaps [rdx-40],xmm0
movaps [rdx-30],xmm1
movaps xmm0,[DATA+60]
movaps xmm1,[DATA+70]
movaps [rdx-20],xmm0
movaps [rdx-10],xmm1
jmp "MK10.exe"+13FF600

file:
push rcx //Backup All 3 Registers
push rax
push rdx
sub rsp,20
lea rcx,[DATA+3]
call SHLWAPI.PathFileExistsA
mov [BOOL],eax
add rsp,20
pop rdx
pop rax
pop rcx
ret

originalcode:
movaps xmm0,[X0Backup] //RESTORE XMM0
movaps [rdx-80],xmm0
movaps xmm1,[rax-70]

exit:
jmp returnhere

"MK10.exe"+13FF5C4:
jmp newmem
nop
nop
nop
returnhere:

atom0s
Moderator

Reputation: 204

Joined: 25 Jan 2006
Posts: 8579
Location: 127.0.0.1

Posted: Sat Jul 16, 2016 11:24 pm Post subject:

You can use 'GetFileAttributes' instead which is exported from kernel32.dll and guaranteed to be available in every process. If the function fails, it will return 'INVALID_FILE_ATTRIBUTES' which allows you to determine if the file is on disk or not. You can also pull the specific reason for failing from GetLastError. If you need more info see: https://msdn.microsoft.com/en-us/library/windows/desktop/aa364944(v=vs.85).aspx _________________ - Retired.

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