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comparison mupdf-source/thirdparty/zxing-cpp/core/src/GTIN.h @ 3:2c135c81b16c

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MERGE: upstream PyMuPDF 1.26.4 with MuPDF 1.26.7
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:44:09 +0200
parents b50eed0cc0ef
children
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0:6015a75abc2d 3:2c135c81b16c
1 /*
2 * Copyright 2016 Nu-book Inc.
3 * Copyright 2016 ZXing authors
4 * Copyright 2020 Axel Waggershauser
5 */
6 // SPDX-License-Identifier: Apache-2.0
7
8 #pragma once
9
10 #include "Barcode.h"
11 #include "BarcodeFormat.h"
12 #include "ZXAlgorithms.h"
13
14 #include <string>
15
16 namespace ZXing::GTIN {
17
18 template <typename T>
19 T ComputeCheckDigit(const std::basic_string<T>& digits, bool skipTail = false)
20 {
21 int sum = 0, N = Size(digits) - skipTail;
22 for (int i = N - 1; i >= 0; i -= 2)
23 sum += digits[i] - '0';
24 sum *= 3;
25 for (int i = N - 2; i >= 0; i -= 2)
26 sum += digits[i] - '0';
27 return ToDigit<T>((10 - (sum % 10)) % 10);
28 }
29
30 template <typename T>
31 bool IsCheckDigitValid(const std::basic_string<T>& s)
32 {
33 return ComputeCheckDigit(s, true) == s.back();
34 }
35
36 /**
37 * Evaluate the prefix of the GTIN to estimate the country of origin. See
38 * <a href="https://www.gs1.org/standards/id-keys/company-prefix">
39 * https://www.gs1.org/standards/id-keys/company-prefix</a> and
40 * <a href="https://en.wikipedia.org/wiki/List_of_GS1_country_codes">
41 * https://en.wikipedia.org/wiki/List_of_GS1_country_codes</a>.
42 *
43 * `format` required for EAN-8 (UPC-E assumed if not given)
44 */
45 std::string LookupCountryIdentifier(const std::string& GTIN, const BarcodeFormat format = BarcodeFormat::None);
46
47 std::string EanAddOn(const Barcode& barcode);
48
49 std::string IssueNr(const std::string& ean2AddOn);
50 std::string Price(const std::string& ean5AddOn);
51
52 } // namespace ZXing::GTIN