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Add counter of addresses stored

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neofsn
Newbie cheater

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Joined: 19 Mar 2022
Posts: 10

Posted: Sun Mar 20, 2022 8:01 am Post subject: Add counter of addresses stored

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Hello, I am trying to add a counter so I can track the number of addresses in my storage and perform a reset so I can prevent overflows also to remove dead addresses.

This is what I am trying but with no luck.

Code:

alloc(counter,4)
addAddress:
mov [ebx],edx //copy address
inc [counter] //increment counter + 1??? not sure
cmp [counter],10 //if we copied 10 address then reset
jae refresh
ret

refresh:
mov [ebx],00000000 //rewrites the storage to basically empty? not sure
mov [counter],0 //rewrites the counter to zero? not sure
ret

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Dark Byte
Site Admin

Reputation: 470

Joined: 09 May 2003
Posts: 25785
Location: The netherlands

Posted: Sun Mar 20, 2022 9:31 am Post subject:

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Keep in mind that this is not thread safe:

Code:

alloc(addAddress,128)
alloc(counter,4)
alloc(list,1024) //so 1024/4=256 entries
registersymbol(addAddress)
registersymbol(counter)
registersymbol(list)

addAddress:
//edx contains the address
push edi
push ecx
push eax

//check if the address is already in the list
mov edi,list
mov ecx,[counter]
add ecx,1
mov eax,edx
repne scasd //run until [edi] contains the value of eax (address to add)) or ecx=0
cmp rcx,0
jne short alreadyinlist

mov edi,list
mov ecx,[counter]
add ecx,1
mov eax,0
repne scasd //run until [edi] contains the value of eax(0) or ecx=0
cmp rcx,0
je short notfound

//found an empty spot
sub edi,4
mov [edi],edx
pop eax
pop ecx
pop edi
ret

notfound:
//add to the list if possible
cmp [counter],#256
jae short listfull
mov edi,[counter]
mov [list+edi*4],edx
inc [counter]

listfull:
alreadyinlist:
pop eax
pop ecx
pop edi
ret

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Dark Byte
Site Admin

Reputation: 470

Joined: 09 May 2003
Posts: 25785
Location: The netherlands

Posted: Sun Mar 20, 2022 9:38 am Post subject:

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alternatively:

Code:

alloc(addAddress,128)
alloc(counter,4)
alloc(list,1024) //so 1024/4=256 entries
registersymbol(addAddress)
registersymbol(counter)
registersymbol(list)

addAddress:
//edx contains the address
{$ccode address=edx}
int i;
extern unsigned int list[256];
extern int counter;

//check if address is in the list
for (i=0; i<counter; i++)
if (list[i]==address) return; //normally return is not recommended as changes to address are undone, but that's a non-issue here

//not a duplicate, scan for an empty spot
for (i=0; i<counter; i++)
if (list[i]==0)
{
list[i]=address;
return;
}

//still here so no free spot
if (counter<=255)
{
list[counter]=address;
counter++;
}

{$asm}
ret

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neofsn
Newbie cheater

Reputation: 0

Joined: 19 Mar 2022
Posts: 10

Posted: Sun Mar 20, 2022 11:11 am Post subject:

Thanks dark byte, got it all working now.

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