public X64NativeTable(Stream scriptFile, int position, int length, int codeSize)
{
scriptFile.Position = position;
Stream stream;
if (Program.RDRNativeCipher)
{
stream = new MemoryStream();
byte carry = (byte)codeSize;
for (int i = 0; i < length * 8; ++i)
{
int b;
if ((b = scriptFile.ReadByte()) == -1)
{
throw new EndOfStreamException("Invalid Scriptfile!");
}
byte xordeciphed = (byte)(carry ^ (byte)b);
carry = (byte)b;
stream.WriteByte(xordeciphed);
}
stream.Position = 0;
}
else
{
stream = scriptFile;
}
IO.Reader reader = new IO.Reader(stream);
int count = 0;
ulong nat;
while (count < length)
{
//GTA V PC natives arent stored sequentially in the table. Each native needs a bitwise rotate depending on its position and codetable size
//Then the natives needs to go back through translation tables to get to their hash as defined in the vanilla game version
//or the earliest game version that native was introduced in.
//Just some of the steps Rockstar take to make reverse engineering harder
nat = Program.IsBit32 ? reader.CReadUInt32() : Utils.RotateLeft(reader.ReadUInt64(), (codeSize + count) & 0x3F);
_nativehash.Add(nat);
if (Program.X64npi.ContainsKey(nat))
{
_natives.Add(Program.X64npi[nat].Display);
}
else
{
_natives.Add(Program.NativeName(Native.UnkPrefix) + Native.CreateNativeHash(nat));
}
count++;
}
}
