I'm trying to reverse engineer a game database and have come to a roadblock.
I can load all the tables/fields/records , however I'm stuck when it comes to converting the record values to hex or bits
the values (in game) are as follows: (15 bits) 192 - (10 bits) 20 - (5 bits) 19 - (5 bits) 2
In the db file , it shows 00 C0 - 00 0A - A6 - 00
This is strange , because only the first value (00 C0) is the same in Hex (192)
The other values are different , I'm guessing this is because they are not full bytes (10 and 5 bits respectively) so it must be using a bit array.
This guess is further proven when I change the final value from 2 , to 31. The last 2 values in the db are changed, and the hex string becomes 00 C0 - 00 0A - E6 - 07
So what's the best way to get these 4 integers in to a bit array in PowerShell so I can try to determine what's going on here ? If it is not obvious to any more experienced programmers what is at play here. If required I could also use C# however I'm less experienced.
Thanks
I am not sure what you want to achieve. 5bits words are literally odd.
It could be that there is no clear conversion here but something like a hash. Anyways, you could technically count from 0 to 2^35 - 1 and poke that in your game and lookup the result in your database.
Let me give you a few conversion methods:
To bit array:
$Bits =
[convert]::ToString(192, 2).PadLeft(15, '0') +
[convert]::ToString( 20, 2).PadLeft(10, '0') +
[convert]::ToString( 19, 2).PadLeft( 5, '0') +
[convert]::ToString( 2, 2).PadLeft( 5, '0')
$Bits
00000001100000000000101001001100010
And back:
if ($Bits -Match '(.{15})(.{10})(.{5})(.{5})') {
$Matches[1..4].Foreach{ [convert]::ToByte($_, 2) }
}
192
20
19
2
To Int64:
$Int64 = [convert]::ToInt64($Bits, 2)
$Int64
201347682
To bytes:
$Bytes = [BitConverter]::GetBytes($Int64)
[System.BitConverter]::ToString($Bytes)
62-52-00-0C-00-00-00-00
Note that the bytes list is reverse order:
[convert]::ToString(0x62, 2)
1100010