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kucingkembar
Advanced Cheater
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Joined: 08 Oct 2020
Posts: 71
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 Posted: Mon Apr 01, 2024 7:33 pm Post subject: how to convert big endian to little endian(vice versa)? |
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i read this topic at https://forum.cheatengine.org/viewtopic.php?t=604168
and read this
| ParkourPenguin wrote: | I'm pretty sure you meant "big endian." With regards to primitive data types composed of multiple bytes, "little endian" means the least significant byte is stored first (used by x86 architectures) and "big endian" means the most significant byte is stored first (not uncommon to see on emulators).
| Code: | 32-bit integer:
0x1234ABCD
big endian:
12 34 AB CD
little endian:
CD AB 34 12 |
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I read the Dark Byte reply using assembly code, but it confusing myself,
is there a simple way to "convert" this? |
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ParkourPenguin
I post too much
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Joined: 06 Jul 2014
Posts: 4702
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| Posted: Mon Apr 01, 2024 7:57 pm Post subject: |
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What specifically do you mean by "convert"? If you're looking for a value type, big endian types are builtin to CE now. Enable them in Edit -> Settings -> Extra Custom Types
If you just mean "convert" in general, then reverse the order of the bytes. What was first is now last, what was second is now second-to-last, etc.
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I don't know where I'm going, but I'll figure it out when I get there. |
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LeFiXER
Grandmaster Cheater Supreme
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Joined: 02 Sep 2011
Posts: 1069
Location: 0x90
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| Posted: Mon Apr 01, 2024 8:02 pm Post subject: |
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You reverse the byte order between the two endiannesses.
12 34 AB CD in big endian becomes CD AB 34 12 in little endian. If you wish to do this programmatically it really depends on the data representation.
| Code: |
function reverseBytes(num)
-- Convert integer to hexadecimal string
local hexValue = string.format('%X', num)
-- Ensure the length of the hex string is even by adding a leading zero if necessary
if #hexValue % 2 ~= 0 then
hexValue = '0' .. hexValue
end
-- Reverse the byte order
local reversedHex = ''
for i = #hexValue, 1, -2 do
reversedHex = reversedHex .. string.sub(hexValue, i-1, i)
end
return reversedHex
end
local num = 0x1234ABCD
printf('Big Endian:\t%X', num)
local converted = reverseBytes(num)
print('Little Endian:\t' .. converted)
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Execute the code in Lua Engine window within Cheat Engine. |
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kucingkembar
Advanced Cheater
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Joined: 08 Oct 2020
Posts: 71
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| Posted: Mon Apr 01, 2024 8:08 pm Post subject: |
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thank you for the reply,
is this "Enable them in Edit -> Settings -> Extra Custom Types" can be edited/exported to Lua script like readSmallInteger()? |
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kucingkembar
Advanced Cheater
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Joined: 08 Oct 2020
Posts: 71
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| Posted: Tue Apr 02, 2024 6:06 am Post subject: |
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| LeFiXER wrote: | You reverse the byte order between the two endiannesses.
12 34 AB CD in big endian becomes CD AB 34 12 in little endian. If you wish to do this programmatically it really depends on the data representation.
| Code: |
function reverseBytes(num)
-- Convert integer to hexadecimal string
local hexValue = string.format('%X', num)
-- Ensure the length of the hex string is even by adding a leading zero if necessary
if #hexValue % 2 ~= 0 then
hexValue = '0' .. hexValue
end
-- Reverse the byte order
local reversedHex = ''
for i = #hexValue, 1, -2 do
reversedHex = reversedHex .. string.sub(hexValue, i-1, i)
end
return reversedHex
end
local num = 0x1234ABCD
printf('Big Endian:\t%X', num)
local converted = reverseBytes(num)
print('Little Endian:\t' .. converted)
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Execute the code in Lua Engine window within Cheat Engine. |
thank you LeFiXER for the reply,
your code is what i looking for,
i want to reply ASAP but something about "double post" prevent me to do it |
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AylinCE
Grandmaster Cheater Supreme
 Reputation: 37
Joined: 16 Feb 2017
Posts: 1522
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| Posted: Tue Apr 02, 2024 9:26 am Post subject: |
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Address based results in this method:
| Code: | address = 0x64F344C0
print("byte: "..readShortInteger(address))
print("word: "..readSmallInteger(address))
print("integer: "..readInteger(address))
print("int64: "..readQword(address))
print("pointer: "..readPointer(address))
print("float: "..readFloat(address))
print("double: "..readDouble(address))
print("string: "..readString(address))
function func2hex(reverse,num,space)
str = ""
if reverse==true then
str = string.format("%08X",num)
else
str = string.format("%08X",num):reverse():gsub("(.)(.)","%2%1")
end
if space==1 then
str = (str):gsub("..", "%1 "):sub(1,-2)
end
return str
end
local num = readInteger(0x64F344C0)
print("numInteger: "..num)
print(func2hex(false,num,0))
print(func2hex(true,num,0))
print(func2hex(false,num,1))
print(func2hex(true,num,1)) |
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