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Birdi
Expert Cheater
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Joined: 08 Jun 2020
Posts: 124
Location: Migrating
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 Posted: Sun Sep 14, 2025 8:19 pm Post subject: Defining 3-Byte Little Endian Custom Type |
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CE7.5
I've got an issue where in memory data is stored as 3 byte little endian for a set of counters.
Most of these are fine as 2 bytes, but one is meant to count up to 1,000,000.
Each 4th byte's tag ends as Hex 40, then the next counter is stored.
I've tried a few approaches in the Cheat Table Lua Script to autoload the Custom Type but it always displays as 0 for the value.
Am I missing something in this?
| Code: |
do
local function register3byte(name)
local function reader(address)
local ok, b = pcall(readBytes, address, 4, true)
if not ok or not b or #b < 3 then return 0 end
local b0 = b[1] or 0
local b1 = b[2] or 0
local b2 = b[3] or 0
return b0 + b1*256 + b2*65536
end
local function writer(address, value)
local v = tonumber(value) or 0
if v < 0 then v = 0 end
if v > 0xFFFFFF then v = 0xFFFFFF end
local ok, t = pcall(readBytes, address+3, 1, true)
local tag = (ok and t and t[1]) and t[1] or 0x40
local b0 = v % 256
local b1 = math.floor(v/256) % 256
local b2 = math.floor(v/65536) % 256
pcall(writeBytes, address, b0, b1, b2, tag)
end
local ok, err = pcall(registerCustomTypeLua, name, 4, reader, writer)
end
register3byte("3 Bytes")
end
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Example:
00 01 0F 40 = 4byte: 1074725120, 2byte: 256, In-Game: 983296, CE: 0
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Dark Byte
Site Admin
 Reputation: 470
Joined: 09 May 2003
Posts: 25781
Location: The netherlands
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| Posted: Mon Sep 15, 2025 5:53 am Post subject: |
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Don't use address. bytes come first
| Code: |
do
local function register3byte(name)
local function reader(b0,b1,b2)
return b0 + b1*256 + b2*65536
end
local function writer(value)
local r=dwordToByteTable(value)
r[4]=nil
return r
end
local ok, err = pcall(registerCustomTypeLua, name, 3, reader, writer)
end
register3byte("3 Bytes")
end
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AylinCE
Grandmaster Cheater Supreme
 Reputation: 37
Joined: 16 Feb 2017
Posts: 1516
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| Posted: Mon Sep 15, 2025 2:34 pm Post subject: |
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My opinion;
| Code: | do
local function register3byte(name)
local function reader(address)
local ok, b = pcall(readBytes, address, 3, true)
if not ok or not b or #b < 3 then return 0 end
local b0 = b[1] or 0
local b1 = b[2] or 0
local b2 = b[3] or 0
return b0 + b1*256 + b2*65536
end
local function writer(address, value)
local v = tonumber(value) or 0
if v < 0 then v = 0 end
if v > 0xFFFFFF then v = 0xFFFFFF end
local b0 = v % 256
local b1 = math.floor(v/256) % 256
local b2 = math.floor(v/65536) % 256
pcall(writeBytes, address, b0, b1, b2)
end
local ok, err = pcall(registerCustomTypeLua, name, 3, reader, writer)
if not ok then
showMessage("Failed to register 3 Bytes custom type: " .. err)
end
end
register3byte("3 Bytes")
end |
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Dark Byte
Site Admin
Reputation: 470
Joined: 09 May 2003
Posts: 25781
Location: The netherlands
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| Posted: Mon Sep 15, 2025 3:15 pm Post subject: |
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as I mentioned in the previous post, the first parameter is not the address, so this will fail
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Birdi
Expert Cheater
Reputation: 0
Joined: 08 Jun 2020
Posts: 124
Location: Migrating
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| Posted: Mon Sep 15, 2025 5:33 pm Post subject: |
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| Dark Byte wrote: | Don't use address. bytes come first
| Code: |
do
local function register3byte(name)
local function reader(b0,b1,b2)
return b0 + b1*256 + b2*65536
end
local function writer(value)
local r=dwordToByteTable(value)
r[4]=nil
return r
end
local ok, err = pcall(registerCustomTypeLua, name, 3, reader, writer)
end
register3byte("3 Bytes")
end
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|
Many thanks, worked perfectly!
For the Writer section, setting the 4th Byte to Nil seems odd to me.
I see in practice it just ignores that one when writing, but my brain tells me it should be "nothing" -- is it that it writes until the end of table or until Nil is met? Just for future cases, should I need to ignore n and m bytes in an array for some reason (probably just easier to do offset +n secondary write tbh)
Edit: Well, rereading the documentation and implementation here I see that bytecount should've been the intended number of bytes and not the size.
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Csimbi
I post too much
 Reputation: 97
Joined: 14 Jul 2007
Posts: 3321
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| Posted: Tue Sep 16, 2025 1:23 pm Post subject: |
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| Birdi wrote: |
For the Writer section, setting the 4th Byte to Nil seems odd to me.
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You do need the last octet of the DWORD to be ignored.
(it will always be 0x40 and so, you are not writing that octet)
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