extern void IT25Encoder(char *src, bool CheckDigit, char *res);

void IT25Encoder(char *src, bool CheckDigit, char *res)
{
	DWORD Sum;
	WORD Weight;
	WORD CurrChar;
	WORD Index;
	char TmpStr[256];
	WORD FinalLen;

	int StrLen = lstrlen(src);

	if (CheckDigit)
	{
		Sum = 0;
		Weight = 3;
		for(int i = 0; i < StrLen; i++)
		{
			CurrChar = src[StrLen - i - 1] - '0';
			Sum = Sum + CurrChar * Weight;
			Weight = 4 - Weight;
		}

		Sum = Sum % 10;
		if (Sum != 0)
			Sum = 10 - Sum;

		if ((StrLen % 2) == 0)
		{
			lstrcpy(TmpStr, "0");
			lstrcat(TmpStr, src);
			TmpStr[StrLen + 1] = (char)(Sum + '0');
			FinalLen = StrLen + 2;
		}
		else
		{
			lstrcpy(TmpStr, src);
			TmpStr[StrLen] = (char)(Sum + '0');
			FinalLen = StrLen + 1;
		}
	}
	else
	{
		if ((StrLen % 2) == 1)
		{
			lstrcpy(TmpStr, "0");
			lstrcat(TmpStr, src);
			FinalLen = StrLen + 1;
		}
		else
		{
			lstrcpy(TmpStr, src);
			FinalLen = StrLen;
		}
	}

	// start character (198)
	Index = 0;
	res[Index++] = (char)(198);
	int i = 0;
	while (i < FinalLen)
	{
		Sum = TmpStr[i] - '0';
		Sum = 10 * Sum + TmpStr[i + 1] - '0';
		if (Sum < 94)
			res[Index++]= (char)(Sum + 33);
		else
			res[Index++]= (char)(Sum + 98);
		i = i + 2;
	}

	// stop character (199)
	res[Index++] = (char)(198);

	res[Index++] = '\0';
}