Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/zxing-cpp/core/src/ReedSolomonEncoder.cpp @ 32:72c1b70d4f5c

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author Franz Glasner <fzglas.hg@dom66.de>
date Sun, 21 Sep 2025 15:10:12 +0200
parents b50eed0cc0ef
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1 /*
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2 * Copyright 2016 Huy Cuong Nguyen
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3 * Copyright 2016 ZXing authors
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4 */
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5 // SPDX-License-Identifier: Apache-2.0
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7 #include "ReedSolomonEncoder.h"
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9 #include "GenericGF.h"
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11 #include <algorithm>
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12 #include <iterator>
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13 #include <stdexcept>
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15 namespace ZXing {
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17 ReedSolomonEncoder::ReedSolomonEncoder(const GenericGF& field)
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18 : _field(&field)
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19 {
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20 _cachedGenerators.push_back(GenericGFPoly(field, { 1 }));
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21 }
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23 const GenericGFPoly&
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24 ReedSolomonEncoder::buildGenerator(int degree)
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25 {
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26 int cachedGenSize = Size(_cachedGenerators);
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27 if (degree >= cachedGenSize) {
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28 GenericGFPoly lastGenerator = _cachedGenerators.back();
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29 for (int d = cachedGenSize; d <= degree; d++) {
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30 lastGenerator.multiply(GenericGFPoly(*_field, { 1, _field->exp(d - 1 + _field->generatorBase()) }));
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31 _cachedGenerators.push_back(lastGenerator);
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32 }
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33 }
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35 return *std::next(_cachedGenerators.begin(), degree);
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36 }
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38 void
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39 ReedSolomonEncoder::encode(std::vector<int>& message, const int numECCodeWords)
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40 {
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41 if (numECCodeWords == 0 || numECCodeWords >= Size(message))
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42 throw std::invalid_argument("Invalid number of error correction code words");
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44 GenericGFPoly info = GenericGFPoly(*_field, std::vector<int>(message.begin(), message.end() - numECCodeWords));
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45 info.multiplyByMonomial(1, numECCodeWords);
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46 GenericGFPoly _;
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47 info.divide(buildGenerator(numECCodeWords), _);
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48 auto& coefficients = info.coefficients();
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49 int numZeroCoefficients = numECCodeWords - Size(coefficients);
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50 std::fill_n(message.end() - numECCodeWords, numZeroCoefficients, 0);
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51 std::copy(coefficients.begin(), coefficients.end(), message.end() - numECCodeWords + numZeroCoefficients);
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52 }
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54 } // ZXing