Подсчет контрольной суммы CRC

class CheckSummCounter
{
protected:
    int cs;
public:
    __fastcall CheckSummCounter() { cs = 0xFF; };
    void __fastcall Reset(void)   { cs = 0xFF; };
    void __fastcall Process(void *ProcessBytes, int BytesCount);
    void __fastcall Process(char ProcessByte) { cs ^= (int)ProcessByte; };
    int  __fastcall Done(void) { int x = cs; this->Reset(); return x; };
};

void __fastcall CheckSummCounter::Process(void *ProcessBytes, int BytesCount)
{
    for(int i = 0; i < BytesCount; i++)
        this->Process(((char*)ProcessBytes));
};

void __fastcall TForm1::Button2Click(TObject *Sender)
{
    CheckSummCounter e3;
    e3.Process((void*)(Edit3->Text.c_str()), Edit3->Text.Length());
    AnsiString x;
    Edit2->Text = x.sprintf("%2X",e3.Done());
}