#define CRC32_POLYNOMIAL 0xEDB88320
unsigned long CRC32Table[256];

void InitCRC32()
{
	static bool CRC32Initialized = false;
	if(CRC32Initialized)
		return;
	CRC32Initialized = true;

	for(unsigned long I = 0; I < 256; I++) {
		unsigned long K = I;
		for(unsigned long J = 0; J < 8; J++)
			K = (K >> 1) ^ ((K & 1) ? CRC32_POLYNOMIAL : 0);
		CRC32Table[I] = K;
	}
}

unsigned long CRC32(unsigned char* Data, unsigned long Size)
{
	InitCRC32();

	unsigned long CRC = 0xffffffff;
	while(Size--)
		CRC = (CRC >> 8) ^ CRC32Table[(CRC & 0xff) ^ *Data++];
	return ~CRC;
}

inline unsigned char Hex(unsigned char Digit)
{
	if(Digit < 10)
		return Digit + '0';
	else
		return Digit - 10 + 'A';
}

unsigned long BNLSChecksum(const char* Password, unsigned long ServerCode)
{
	unsigned long Size = (unsigned long)strlen(Password);
	unsigned char* Data = new unsigned char[Size + 8];
	memcpy(Data, Password, Size);
	unsigned long I = 7;
	do {
		Data[Size + I] = Hex((unsigned char)ServerCode & 0xf);
		ServerCode >>= 4;
	}
	while(I--);

	unsigned long Checksum = CRC32(Data, Size + 8);
	delete[] Data;
	return Checksum;
}