// Function: sanitize_line
// Description: Returns a sanitized version of the line passed in.
// Uses Functions:
// Parameters: Line from an ACH file.
// Pre-Conditions: string
// Post-Conditions: string
// Return: Sanitized version of line.
public static string sanitize_line(string line)
{
StringBuilder sanitizedLine = new StringBuilder(line); // Deal with line as a stringbuilder for convenience.
if (line[0] == '6') // Card numbers are only on lines that start with 6.
{
// Sanitize number.
ulong number = UInt64.Parse(line.Substring(12, 16));
sanitizedLine.Remove(12, 16);
sanitizedLine.Insert(12, (CardFunctions.get_sanitized_number(number)).ToString());
// Sanitize name.
for (int i = 39; i < 78; i++)
{
sanitizedLine[i] = char_randomizer(sanitizedLine[i]);
}
}
else if (line[0] == '5')
{
// Sanitize name.
for (int i = 53; i < 68; i++)
{
sanitizedLine[i] = char_randomizer(sanitizedLine[i]);
}
}
return(sanitizedLine.ToString());
}
// Function: get_sanitized_number
// Description: Returns sanitized version of card number.
// Uses Functions: get_corrected_number
// Parameters: Number to be sanitized.
// Pre-Conditions: Valid card number.
// Post-Conditions: Number retains first 5 digits then is all zeros, except for the check digit at the end that will pass the Luhn Algorithm.
// Return: Sanitized number.
public static ulong get_sanitized_number(ulong num)
{
ulong returnNum = 0;
int checkDigit = CardFunctions.get_last_digit(num);
int[] digits = num.ToString().Select(Convert.ToInt32).ToArray(); // Convert num into array of digits.
for (int i = 0; i < 5; i++) // Retain first 5 digits of the number, and zero the rest.
{
digits[i] -= 48;
returnNum += Convert.ToUInt64(digits[i]) * Convert.ToUInt64(Math.Pow(10, digits.Length - i - 1));
}
return(get_corrected_number(returnNum)); // Return number with the correct check digit at the end.
}