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AylinCE
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 Posted: Wed Oct 01, 2025 6:57 am Post subject: Parsing a number from an address (Double~Int) |
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We aim to contribute to the CE and CEF archives as much as possible.
Please support further sharing on this topic.
I have a project where I need to parse whether a number retrieved from an address is a "Double" or an "Integer."
I'll probably compare the results of a vtAll scan of a mixture of 4 bytes and Doubles and add them to the address list.
Here's the parsing method I want to use:
| Code: | function getAOB(address, length)
local bytestring1={}
local str=''
bytestring1=readBytes(address, tonumber(length), true)
for i,k in pairs(bytestring1) do
str=str..string.format('%02x ',bytestring1[i])
end
return str:upper()
end
function isLikelyDouble(d, i, aob)
if math.abs(d) < 1e-100 and i ~= 0 then
return false
end
if d == 0.0 and i == 0 then
if aob:match("^00 00 00 00 00 00 00 00$") then
return true
else
return false
end
end
if d ~= math.floor(d) then
return true
end
local maxInt32 = 2147483648
if math.abs(d) >= maxInt32 then
return true
end
local leading4Bytes = aob:match("^%x%x %x%x %x%x %x%x")
if d == math.floor(d) and leading4Bytes:match("^00 00 00 00$") then
return true
end
return false
end
function readUnsignedInt(addr, opt)
local signed = readInteger(addr, true)
if opt then
if signed < 0 then
return signed + 4294967296 -- 2^32
else
return signed
end
else
return signed
end
end
function checkType(addr)
local d = readDouble(addr)
local i = readInteger(addr, true)
local aob = getAOB(addr, 8)
local res = ""
if isLikelyDouble(d, i, aob) then
res = string.format("Likely DOUBLE: %.12f - %s", d, aob)
else
res = string.format("Likely INT: %d - %s", readUnsignedInt(addr, true), aob)
end
print(res)
end
addr1 = "14C14398F50" -- Double
checkType(addr1)
addr2 = "7B589EF2D8" -- Int
checkType(addr2)
addr3 = "14C03478FA0" -- Double
checkType(addr3)
addr4 = "7B589FEC38" -- Int
checkType(addr4)
addr5 = "7B589FECF0" -- Int ( unsigned: 2863311530, true / signed: -1431655766, false )
checkType(addr5) |
result:
Likely DOUBLE: 999.125000000000 - 02 00 00 00 00 39 8F 40
Likely INT: 100 - 64 00 00 00 00 00 00 00
Likely DOUBLE: 1000.876464843750 - 01 00 00 00 03 47 8F 40
Likely INT: 2863311530 - AA AA AA AA AA AA AA AA
Likely INT: 0 - 00 00 00 00 00 00 00 00
If you have an idea for a better approach to this issue, please contribute to improve the code.
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ParkourPenguin
I post too much
 Reputation: 152
Joined: 06 Jul 2014
Posts: 4702
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| Posted: Wed Oct 01, 2025 11:00 am Post subject: |
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CE has the Lua function autoGuess that guesses what type the value at some address is.
| Code: | function byteTableToAOB(bt)
local t = {}
for i,b in ipairs(bt) do
t[i] = ('%02X'):format(b)
end
return table.concat(t, ' ')
end
function checkType(addr)
local g = autoGuess(addr)
if g == vtDouble then
local bt = readBytes(addr, 8, true)
print(('double: %.12f - %s'):format(byteTableToDouble(bt), byteTableToAOB(bt)))
elseif g == vtDword then
local bt = readBytes(addr, 4, true)
print(('int: %d - %s'):format(byteTableToDword(bt), byteTableToAOB(bt)))
else
print('Other type:', g) -- see defines.lua
end
end |
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AylinCE
Grandmaster Cheater Supreme
Reputation: 37
Joined: 16 Feb 2017
Posts: 1522
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| Posted: Wed Oct 01, 2025 2:37 pm Post subject: |
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| ParkourPenguin wrote: | | CE has the Lua function autoGuess ... |
This is promising code, thanks.
But there's a global bug in "autoGuess" in 7.5.
Has this been defined?
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Dark Byte
Site Admin
 Reputation: 470
Joined: 09 May 2003
Posts: 25796
Location: The netherlands
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| Posted: Wed Oct 01, 2025 3:38 pm Post subject: |
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you can always use onAutoGuess to fix whatever bug you think it has
e.g when CE thinks something is a pointer, because the value it represents is dividable by 8 and the address it represents is readable , you can tell it, no, it's a double/float/int/whatever
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AylinCE
Grandmaster Cheater Supreme
Reputation: 37
Joined: 16 Feb 2017
Posts: 1522
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| Posted: Wed Oct 01, 2025 4:28 pm Post subject: |
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So why "nil"?
| Code: | function byteTableToAOB(bt)
local t = {}
for i,b in ipairs(bt) do
t[i] = ('%02X'):format(b)
end
return table.concat(t, ' ')
end
function checkType(addr)
local g = onAutoGuess(addr) -- > g = nil ..
if g == vtDouble then
local bt = readBytes(addr, 8, true)
print(('double: %.12f - %s'):format(byteTableToDouble(bt), byteTableToAOB(bt)))
elseif g == vtDword then
local bt = readBytes(addr, 4, true)
print(('int: %d - %s'):format(byteTableToDword(bt), byteTableToAOB(bt)))
else
print(('Other type: %s'):format(g)) -- see defines.lua
end
end
addr1 = 0x1824006473F8 -- Double
checkType(addr1)
addr2 = "29AA1FEE10" -- Int
checkType(addr2)
addr3 = "3220047A352" -- Double
checkType(addr3)
addr4 = "3220018B4EC" -- Int
checkType(addr4) |
result:
Other type: nil
Other type: nil
Other type: nil
Other type: nil
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ParkourPenguin
I post too much
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Joined: 06 Jul 2014
Posts: 4702
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| Posted: Wed Oct 01, 2025 4:31 pm Post subject: |
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I think `autoGuess` became a global function in 7.6. I can't find it in the github repository.
`onAutoGuess` is used to override CE's default type-guessing behaviour.
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Dark Byte
Site Admin
Reputation: 470
Joined: 09 May 2003
Posts: 25796
Location: The netherlands
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| Posted: Wed Oct 01, 2025 4:59 pm Post subject: |
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right.
in 7.5 you'd have to use the structure class
| Code: |
function autoGuess(address)
local sf=enumStructureForms()
if #sf==0 then --autoGuess needs a dissect struct form to exist in ce 7.5
f=createStructureForm()
f.hide()
end
local s=createStructure('temp')
local as
if type(address)~='string' then
as=string.format('%x',address)
else
as=address
end
s.autoGuess(as,0,16)
local result
if s.Count>0 then
result=s[0].VarType
else
result=nil
end
s.destroy()
return result
end
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AylinCE
Grandmaster Cheater Supreme
Reputation: 37
Joined: 16 Feb 2017
Posts: 1522
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| Posted: Wed Oct 01, 2025 6:47 pm Post subject: |
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I think it defines fractional numbers as bytes.
| Code: | function autoGuess(address)
local sf = enumStructureForms()
if #sf == 0 then
local f = createStructureForm()
f.hide()
end
local s = createStructure('temp')
local as = type(address) == 'string' and address or string.format('%x', address)
s:autoGuess(as, 0, 16)
local result = nil
local e = s:getElement(0)
if e and e.Vartype then
print("Element 0 type:", e.VarType)
result = e.VarType
end
s:destroy()
return result
end |
addr1 = "1824006473F8" -- Double
checkType(addr1)
addr2 = "29AA1FEE10" -- Int
checkType(addr2)
addr3 = "3220047A352" -- Double >> 100.000000079162
checkType(addr3)
addr4 = "3220018B4EC" -- Int
checkType(addr4)
addr3 = "3220056F62B" -- float >> 1001.015625
checkType(addr3)
result:
Element 0 type: vtDouble
double: 100.000000000000 - 00 00 00 00 00 00 59 40
Element 0 type: vtDword
int: 1000 - E8 03 00 00
Element 0 type: vtByte
Other type: vtByte
Element 0 type: vtDword
int: 1000 - E8 03 00 00
Element 0 type: vtByte
Other type: vtByte
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Dark Byte
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Joined: 09 May 2003
Posts: 25796
Location: The netherlands
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| Posted: Wed Oct 01, 2025 11:18 pm Post subject: |
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compilers generally never put floats in an address not dividable by at least 4 (8 or 16 is actually more common) so CE doesn't detect that as a float and just uses bytes to pad to the next alignment
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