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Ean13Validator.cs
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Ean13Validator.cs
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// ***********************************************************************
// Assembly : FCS.Lib.Utility
// Filename : Ean13Validator.cs
// Author : Frede Hundewadt
// Created : 2024 03 29 12:36
//
// Last Modified By : root
// Last Modified On : 2024 04 11 13:03
// ***********************************************************************
// <copyright company="FCS">
// Copyright (C) 2024-2024 FCS Frede's Computer Service.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see [https://www.gnu.org/licenses]
// </copyright>
// <summary></summary>
// ***********************************************************************
using System;
namespace FCS.Lib.Utility;
public class Ean13Validator
{
private const int Size = 12;
public static bool Validate(string number)
{
if (number.Length != Size + 1)
return false;
return number == ParsedNumber(number.Substring(0, 12));
}
private static string Ean13(int[] firstDigits)
{
var summedProduct = 0;
var randomDigits = new Random();
bool isNull;
if (firstDigits == null)
{
firstDigits = new int[Size];
isNull = true;
}
else
{
isNull = false;
}
for (var idx = 0; idx < Size; idx++)
{
var alt = idx % 2 == 0 ? 1 : 3;
int digit;
if (isNull)
{
digit = randomDigits.Next(10);
firstDigits[idx] = digit;
}
else
{
digit = firstDigits[idx];
}
summedProduct += digit * alt;
}
var checkDigit = 10 - summedProduct % 10;
if (checkDigit == 10)
checkDigit = 0;
return string.Join("", firstDigits) + checkDigit;
}
private static string ParsedNumber(string number)
{
var firstDigits = new int[Size];
if ((number.Length != Size) | !long.TryParse(number, out _))
return null;
for (var idx = 0; idx < Size; idx++)
{
var digit = int.Parse(number[idx].ToString());
firstDigits[idx] = digit;
}
return Ean13(firstDigits);
}
}