private static int CalculateChecksum(int[] weights, StringNumber number, bool tverrsum)
{
int checksum = 0;
for (int i = 0; i < weights.Length; i++)
{
int weight = weights[i];
int currentNumber = number.GetAt(weights.Length - 1 - i);
int product = weight * currentNumber;
if (tverrsum)
{
if (product > 9)
{
checksum += product - 9;
}
else
{
checksum += product;
}
}
else
{
checksum += product;
}
}
return(checksum);
}
protected static int CalculateMod10CheckSum(int[] weights, StringNumber number)
{
int checksum = CalculateChecksum(weights, number, true)%10;
if (checksum == 0)
return 0;
else
return 10 - checksum;
}
protected static int[] GetMod11Weights(StringNumber k)
{
var weights = new int[k.GetLength() - 1];
for (int i = 0; i < weights.Length; i++)
{
int j = i%BaseMod11Weights.Length;
weights[i] = BaseMod11Weights[j];
}
return weights;
}
protected static int CalculateMod11CheckSum(int[] weights, StringNumber number)
{
int c = CalculateChecksum(weights, number, false) % 11;
if (c == 1)
{
throw new ArgumentException(ERROR_INVALID_CHECKSUM + number);
}
return(c == 0 ? 0 : 11 - c);
}
protected static int CalculateMod11CheckSum(int[] weights, StringNumber number)
{
int checksum = CalculateChecksum(weights, number, false)%11;
if (checksum == 1)
throw new ArgumentException(InvalidChecksumErrorMessage + number);
if (checksum == 0)
return 0;
else
return 11 - checksum;
}
protected static int[] GetMod11Weights(StringNumber k)
{
var weights = new int[k.GetLength() - 1];
for (int i = 0; i < weights.Length; i++)
{
int j = i % BaseMod11Weights.Length;
weights[i] = BaseMod11Weights[j];
}
return(weights);
}
protected static int[] GetMod10Weights(StringNumber k)
{
var weights = new int[k.GetLength() - 1];
for (int i = 0; i < weights.Length; i++)
{
if ((i%2) == 0)
weights[i] = 2;
else
weights[i] = 1;
}
return weights;
}
protected static int CalculateMod10CheckSum(int[] weights, StringNumber number)
{
int checksum = CalculateChecksum(weights, number, true) % 10;
if (checksum == 0)
{
return(0);
}
else
{
return(10 - checksum);
}
}
protected static int[] GetMod10Weights(StringNumber k)
{
var weights = new int[k.GetLength() - 1];
for (int i = 0; i < weights.Length; i++)
{
if ((i % 2) == 0)
{
weights[i] = 2;
}
else
{
weights[i] = 1;
}
}
return(weights);
}
protected static int CalculateMod11CheckSum(int[] weights, StringNumber number)
{
int checksum = CalculateChecksum(weights, number, false) % 11;
if (checksum == 1)
{
throw new ArgumentException(InvalidChecksumErrorMessage + number);
}
if (checksum == 0)
{
return(0);
}
else
{
return(11 - checksum);
}
}
private static int CalculateChecksum(int[] weights, StringNumber number, bool tverrsum)
{
int checkSum = 0;
for (int i = 0; i < weights.Length; i++)
{
int product = weights[i] * number.GetAt(weights.Length - 1 - i);
if (tverrsum)
{
checkSum += (product > 9 ? product - 9 : product);
}
else
{
checkSum += product;
}
}
return(checkSum);
}
private static int CalculateChecksum(int[] weights, StringNumber number, bool tverrsum)
{
int checksum = 0;
for (int i = 0; i < weights.Length; i++)
{
int weight = weights[i];
int currentNumber = number.GetAt(weights.Length - 1 - i);
int product = weight*currentNumber;
if (tverrsum)
{
if (product > 9) checksum += product - 9;
else checksum += product;
}
else
{
checksum += product;
}
}
return checksum;
}
protected static int CalculateMod10CheckSum(int[] weights, StringNumber number)
{
int c = CalculateChecksum(weights, number, true) % 10;
return(c == 0 ? 0 : 10 - c);
}