 |
Cheat Engine
The Official Site of Cheat Engine
|
| View previous topic :: View next topic |
| Author |
Message |
AylinCE
Grandmaster Cheater Supreme
 Reputation: 37
Joined: 16 Feb 2017
Posts: 1516
|
 Posted: Fri Apr 18, 2025 6:00 am Post subject: Lua on bit32.. (@DB, @atom0s) |
 |
|
I see that "bit32" is marked as the syntax in CE.
But when I want to use it, it gives "undefined, nil".
Instead, I had to define "bit32" for "XOR".
Probably because "bit32" was deprecated after Lua 5.2 and a 64 bit version was defined. (5.2+)
My question: Which one do you find more useful?
Of course, the intended use is also important.
Here is a standalone example:
| Code: | -- Defining bit32 XOR function manually
local bit32 = {}
function bit32.bxor(a, b)
local result = 0
local bit = 1
while a > 0 or b > 0 do
local a_bit = a % 2
local b_bit = b % 2
local xor_bit = (a_bit + b_bit) % 2
result = result + xor_bit * bit
a = math.floor(a / 2)
b = math.floor(b / 2)
bit = bit * 2
end
return result
end
-- XOR Encryption Function
function xorEncryptDecrypt(input, key)
local output = {}
local out2 = ""
for i = 1, #input do
local char = string.byte(input, i)
local encryptedChar = bit32.bxor(char, key)
table.insert(output, string.char(encryptedChar))
end
out2 = table.concat(output)
out2 = string.gsub(out2, "[\n\r]", " ")
return out2
end
-- Encryption Key
local key = 42
-- Text to be Encrypted
local originalText = "print('This is a test text.')"
-- Encode
local encryptedText = xorEncryptDecrypt(originalText, key)
print("Encode Text:")
print(encryptedText)
-- Ahh.. It would be better to write the output to a ".lua" file. ;)
-- Decode
local decryptedText = xorEncryptDecrypt(encryptedText, key)
print("Decode Text:")
print(decryptedText) |
Or "64-bit" example:
| Code: | -- 64-bit values
local a = 0x12345678ABCDEF01 -- A 64-bit number
local b = 0xF0F0F0F0F0F0F0F0 -- Another 64-bit number
-- Bitwise "AND" operation
local and_result = a & b
print(string.format("AND result: 0x%X", and_result))
-- Bitwise "OR" operation
local or_result = a | b
print(string.format("OR result: 0x%X", or_result))
-- Bitwise "XOR" operation
local xor_result = a ~ b
print(string.format("XOR result: 0x%X", xor_result))
-- Bitwise shifts (left and right)
local shift_left = a << 4 -- Shift left by 4 bits
local shift_right = b >> 4 -- Shift right by 4 bits
print(string.format("Left shift: 0x%X", shift_left))
print(string.format("Right shift: 0x%X", shift_right)) |
Results:
| Code: | AND result: 0x10305070A0C0E000
OR result: 0xF2F4F6F8FBFDFFF1
XOR result: 0xE2C4A6885B3D1FF1
Left shift: 0x2345678ABCDEF010
Right shift: 0xF0F0F0F0F0F0F0F |
On the other hand, I can see that the required operation works without using "bit32":
| Code: | function xorEncryptDecrypt(input, key)
local output = {}
for i = 1, #input do
local char = string.byte(input, i)
local encryptedChar = char ~ key
table.insert(output, string.char(encryptedChar))
end
local singleLineOutput = table.concat(output)
singleLineOutput = string.gsub(singleLineOutput, "[\n\r]", " ")
return singleLineOutput
end |
"bit32" is not defined in "celua.txt" but it is still marked in Lua Script.
Why?
_________________
|
|
| Back to top |
|
 |
ParkourPenguin
I post too much
 Reputation: 152
Joined: 06 Jul 2014
Posts: 4695
|
| Posted: Fri Apr 18, 2025 11:04 am Post subject: |
|
|
Use Lua's builtin binary ops. e.g. xor: `~`
| AylinCE wrote: | "bit32" is not defined in "celua.txt" but it is still marked in Lua Script.
Why? |
Lua 5.2's bit32 stdlib was deprecated in favor of Lua 5.3's new binary ops.
It still gets highlighted because DB didn't remove the code that highlighted "bit32". I don't think this has anything to do with backwards compatibility... perhaps it was simply forgotten.
_________________
I don't know where I'm going, but I'll figure it out when I get there. |
|
| Back to top |
|
|
AylinCE
Grandmaster Cheater Supreme
Reputation: 37
Joined: 16 Feb 2017
Posts: 1516
|
| Posted: Fri Apr 18, 2025 1:43 pm Post subject: |
|
|
| ParkourPenguin wrote: | | ... |
Probably as you said.
I am evaluating applications to shorten some codes.
Actually, he may have forgotten the emphasis because there is no need for "bit32".
I am just wondering if there are other options. 
_________________
|
|
| Back to top |
|
|
atom0s
Moderator
 Reputation: 205
Joined: 25 Jan 2006
Posts: 8585
Location: 127.0.0.1
|
|
| Back to top |
|
|
AylinCE
Grandmaster Cheater Supreme
Reputation: 37
Joined: 16 Feb 2017
Posts: 1516
|
| Posted: Sat Apr 19, 2025 2:07 am Post subject: |
|
|
@atom0s, Thanks for the answer.
As far as I understand, you are using older versions of Lua and still recommending newer versions.
On the other hand, what interested me was the integration of Lua with CE.
I could not really adopt Lua outside of CE.
Also, considering Lua in your case, I cannot calculate the layers. Because the level you are at (LuaJIT) reminds me of the following saying;
"LuaJIT is like a superhero costume for Lua: Faster, more powerful and more impressive!"
(I will not bother you unnecessarily by asking why it does not work with versions after 5.1.)
Yes, I think the marked status of "bit32" is a forgotten or "if needed" detail to be revisited.
Frankly, there is an alternative and I think it does not need to be defined.
_________________
|
|
| Back to top |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
|
|
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
