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AylinCE
Grandmaster Cheater Supreme
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Joined: 16 Feb 2017
Posts: 1527
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 Posted: Fri Apr 18, 2025 6:00 am Post subject: Lua on bit32.. (@DB, @atom0s) |
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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?
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ParkourPenguin
I post too much
 Reputation: 152
Joined: 06 Jul 2014
Posts: 4706
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| Posted: Fri Apr 18, 2025 11:04 am Post subject: |
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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.
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AylinCE
Grandmaster Cheater Supreme
Reputation: 37
Joined: 16 Feb 2017
Posts: 1527
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| Posted: Fri Apr 18, 2025 1:43 pm Post subject: |
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| 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. 
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atom0s
Moderator
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Joined: 25 Jan 2006
Posts: 8587
Location: 127.0.0.1
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AylinCE
Grandmaster Cheater Supreme
Reputation: 37
Joined: 16 Feb 2017
Posts: 1527
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| Posted: Sat Apr 19, 2025 2:07 am Post subject: |
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@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.
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