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Custom Float Type (Lua Script)

 
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RandName
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Joined: 19 Jun 2015
Posts: 22

PostPosted: Tue Jun 30, 2015 11:26 am    Post subject: Custom Float Type (Lua Script) Reply with quote

Hello together,

I am really bad with asm so I need help with creating a custom (float) type for a lua script of mine.

The "encryption" is as follows:
First there is a pointer which points to two addresses.
The value of the two addresses have to be xored against each other.
It would look something like this: xor(readInteger(pointer), readInteger(pointer+4))
The result now gets converted to a float value (hex->float).

Code:
xoredVal = bXor(readInteger(valPtr), readInteger(valPtr + 4))
val = hex2float(xoredVal)


So my question is now, whether it is possible to realize this by creating a custom type.
And if it is possible, how?
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Dark Byte
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PostPosted: Tue Jun 30, 2015 12:50 pm    Post subject: Reply with quote

it's "possible" but it's going to be really really really really really really really really really really really really slow when done like that

it might be easier(and a lot faster) to just use a 8 byte custom type, split the 8 bytes up into 2 4 byte values, xor the 2 values and convert that to float.

anyhow, for using the pointer method:
Code:

--Note: keep the function base name unique.
typename="Pointer to xored value type" --shown as the typename in ce
bytecount=4  --number of bytes of this type
functionbasename="customvaluetype3"

function customvaluetype3_bytestovalue(b1,b2,b3,b4)
  local pointer=byteTableToDword({b1,b2,b3,b4})

  local v1=readInteger(pointer)
  local v2=readInteger(pointer+4)

  if (v1~=nil) and (v2~=nil) then
    local v=bXor(v1,v2)
    local bt=dwordToByteTable(v)
    return byteTableToFloat(bt)
  else
    return 0
  end
end

function customvaluetype3_valuetobytes(i)

--return the bytes to write (usually only used when you change the value)
error('not supported')
--return 0,0,0,0

end
return typename,bytecount,functionbasename

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