FearLess Cheat Engine

Posted: **Sun Jan 02, 2022 10:44 am**

This is collections of functions that will help you with memory editing and other
btw this post will keep updating (since i've opened this thread,i won't dump this)

Memory editing(byte inject)

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function MakeRangedNop(addr,addrTo)
    addr = getAddress(addr)
    addrTo = getAddress(addrTo)
    local size
    if addr == nil then
        return
    end
    if addrTo == nil then
        size = getInstructionSize(addr)
    end
    size = -(addr - addrTo)
    MakeNop(addr,size)
end

function MakeNop(addr,size)
    addr = getAddress(addr)
    size = tonumber(size)
    if addr == nil then
        return
    end
    if size == 0 then
        return
    end
    if size == nil then
        size = getInstructionSize(addr)
    end
    size = size - 1
    for i = 0,size do
        writeBytes(addr+i,0x90)
    end
end

Value types

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function readBoolean(addr)
    local result
    if addr == nil then
        return nil
    end
    result = readBytes(addr) == 1
    if readBytes(addr) > 1 then
        result = nil
    end
    return result
end

function writeBoolean(addr,bool)
    local result
    if addr == nil or bool == nil then
        return
    end
    result = bool and 1 or 0
    writeBytes(addr,result)
end

function rewriteString(addr,text,wideChar)
    if addr == nil then
        error("Address wasn't setted!")
        return
    end
    if text == nil then
        error("String wasn't aspected!")
        return
    end
    if wideChar == nil then
        wideChar = false
    end
    addr = getAddress(addr)
    if not addr then return end
    local size = #readString(addr)
    if wideChar then
        local size = size * 2
        for i = 0,size do
            writeBytes(addr+i,{0x00,0x00})
        end
    else
        for i = 0,size do
            writeBytes(addr+i,0)
        end
    end
    writeString(addr,text,wideChar)
end

Posted: **Sun Jan 02, 2022 11:22 am**

Frouk wrote: ↑
Sun Jan 02, 2022 10:44 am
..

Didn't belong in tools section, moved to appropriate forum.

Posted: **Sun Jan 02, 2022 12:52 pm**

The "rewriteString" won't work for wide character or unicode strings. For a zero terminated string all you need is a zero at the end. And doing a memory write for every byte can be a bit slow you'd be better off making a table of bytes then writing to memory once using the byte table. Something like this is all you really need for a zero terminated string.

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---- 
---- Writes a zero terminated string to the given address.
---- 
---- writeStringZT(address, text)
---- writeStringZT(address, text, wideChar)
---- 
---- Parameters:
---- 	address : number - string : 
---- 		The address to write to.
---- 	text : string : 
---- 		The string to write to memory.
---- 	wideChar (optional): boolean : 
---- 		Set to true for wide character strings.
function writeStringZT(address, text, wideChar)
	address = getAddressSafe(address)
	if not address then return end
	writeString(address, text, wideChar)
	local len = #text
	if wideChar then len = len * 2 end
	writeBytes(address + len, { 0x00, 0x00 })
end
registerLuaFunctionHighlight('writeStringZT')

And for local strings:

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---- 
---- Writes a zero terminated string to the given address targeting the CE process.
---- 
---- writeStringLocalZT(address, text)
---- writeStringLocalZT(address, text, wideChar)
---- 
---- Parameters:
---- 	address : number - string : 
---- 		The address to write to.
---- 	text : string : 
---- 		The string to write to memory.
---- 	wideChar (optional): boolean : 
---- 		Set to true for wide character strings.
function writeStringLocalZT(address, text, wideChar)
	address = getAddressSafe(address, true)
	if not address then return end
	writeStringLocal(address, text, wideChar)
	local len = #text
	if wideChar then len = len * 2 end
	writeBytesLocal(address + len, { 0x00, 0x00 })
end
registerLuaFunctionHighlight('writeStringLocalZT')

EDIT:
And the "PrintRangedBytes" seems like Ctrl+Alt+C in the memory view form does what you need. And you might at least want to use a 2 digit format for the printed bytes, and even maybe build the string then print. And a read for every byte will be slow again, instead you can just use something like readBytes(addr, size). Right now it outputs something like this:

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48 
8D 
D 
BF 
B4 
1A 
0

Where as Ctrl+Alt+C will give you something like this:

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48 8D 0D BF B4 1A 00

EDIT 2:
And it took me forever to figure this out but when you throw an error you can give it a stack index to throw the error at the caller's location instead of inside your function. e.g.:

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local function errorTest(somePara)
      if not somePara then
         error('no parameter given')
      end
end
errorTest()

This will output an error message like this, note the line number:

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Error:[string "local function errorTest1(somePara)
..."]:3: no parameter given
Script Error

But with the stack index:

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local function errorTest(somePara)
      if not somePara then
         error('no parameter given', 2)
      end
end
errorTest()

It will output an error message like this, again note the line number:

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Error:[string "local function errorTest(somePara)
..."]:6: no parameter given
Script Error

If you're calling the function a lot this will help find where the error actually is.

Posted: **Mon Jan 03, 2022 10:08 am**

Well, i didn't had wide char string,so i decided to do without it

Posted: **Mon Jan 03, 2022 6:08 pm**

Frouk wrote: ↑
Mon Jan 03, 2022 10:08 am
Well, i didn't had wide char string,so i decided to do without it

It doesn't hurt to provide that functionality. Widechar is a type used to deal with multi-byte characters.

FearLess Cheat Engine

Memory Editing & etc lua scripts

Memory Editing & etc lua scripts

Re: Memory Editing & etc lua scripts

Re: Memory Editing & etc lua scripts

Re: Memory Editing & etc lua scripts

Re: Memory Editing & etc lua scripts