73 lines
2.5 KiB
C#
73 lines
2.5 KiB
C#
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// ***********************************************************************
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// Assembly : FCS.Lib.Utility
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// Author : inno
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// Created : 2023 04 25 09:01
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//
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// Last Modified By : inno
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// Last Modified On : 2023 04 30 10:25
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// ***********************************************************************
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// <copyright file="EanFormatValidator.cs" company="FCS">
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// Copyright (C) 2023-2023 FCS Frede's Computer Services.
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as
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// published by the Free Software Foundation, either version 3 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see [https://www.gnu.org/licenses]
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// </copyright>
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// <summary></summary>
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// ***********************************************************************
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using System.Collections.Generic;
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namespace FCS.Lib.Utility;
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public class EanFormatValidator
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{
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private const int Ean13Size = 12;
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public static bool ValidateIan13(string number)
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{
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if (number.Length != Ean13Size + 1) return false;
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return number == ParsedNumber(number.Substring(0, Ean13Size));
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}
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private static string CalculateIan13(IReadOnlyList<int> firstDigits)
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{
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var subResult = 0;
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for (var idx = 0; idx < Ean13Size; idx++)
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{
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var alt = idx % 2 == 0 ? 1 : 3;
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var digit = firstDigits[idx];
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subResult += digit * alt;
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}
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var checkDigit = 10 - subResult % 10 == 10 ? 0 : 10 - subResult % 10;
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return string.Join("", firstDigits) + checkDigit;
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}
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private static string ParsedNumber(string number)
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{
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var firstDigits = new int[Ean13Size];
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if ((number.Length != Ean13Size) | !long.TryParse(number, out _))
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return null;
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for (var idx = 0; idx < Ean13Size; idx++)
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{
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var digit = int.Parse(number[idx].ToString());
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firstDigits[idx] = digit;
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}
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return CalculateIan13(firstDigits);
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}
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}
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