Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/zxing-cpp/core/src/GenericGFPoly.h @ 38:8934ac156ef5

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Allow to build with the PyPI package "clang" instead of "libclang". 1. It seems to be maintained. 2. In the FreeBSD base system there is no pre-built libclang.so. If you need this library you have to install llvm from ports additionally. 2. On FreeBSD there is no pre-built wheel "libclang" with a packaged libclang.so.
author Franz Glasner <fzglas.hg@dom66.de>
date Tue, 23 Sep 2025 10:27:15 +0200
parents b50eed0cc0ef
children
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1 /*
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2 * Copyright 2016 Nu-book Inc.
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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 #pragma once
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9 #include "ZXAlgorithms.h"
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11 #include <algorithm>
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12 #include <cassert>
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13 #include <cstddef>
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14 #include <vector>
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16 namespace ZXing {
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18 class GenericGF;
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20 /**
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21 * <p>Represents a polynomial whose coefficients are elements of a GF.
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22 * Instances of this class are immutable.</p>
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23 *
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24 * <p>Much credit is due to William Rucklidge since portions of this code are an indirect
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25 * port of his C++ Reed-Solomon implementation.</p>
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26 *
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27 * @author Sean Owen
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28 */
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29 class GenericGFPoly
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30 {
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31 struct Coefficients : public std::vector<int>
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32 {
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33 void reserve(size_t s)
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34 {
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35 if (capacity() < s)
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36 std::vector<int>::reserve(std::max(size_t(32), s));
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37 }
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39 void resize(size_t s)
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40 {
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41 reserve(s);
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42 std::vector<int>::resize(s);
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43 }
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44
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45 void resize(size_t s, int i)
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46 {
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47 reserve(s);
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48 std::vector<int>::resize(s, i);
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49 }
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50 };
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52 public:
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53 // Build a invalid object, so that this can be used in container or return by reference,
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54 // any access to invalid object is undefined behavior.
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55 GenericGFPoly() = default;
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57 /**
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58 * @param field the {@link GenericGF} instance representing the field to use
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59 * to perform computations
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60 * @param coefficients coefficients as ints representing elements of GF(size), arranged
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61 * from most significant (highest-power term) coefficient to least significant
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62 */
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63 GenericGFPoly(const GenericGF& field, std::vector<int>&& coefficients) : _field(&field)
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64 {
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65 assert(!coefficients.empty());
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66 _coefficients.swap(coefficients); // _coefficients = coefficients
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67 normalize();
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68 }
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69 GenericGFPoly(const GenericGF& field, const std::vector<int>& coefficients) : GenericGFPoly(field, std::vector<int>(coefficients)) {}
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71 GenericGFPoly& operator=(GenericGFPoly&& other) noexcept = default;
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72 GenericGFPoly(GenericGFPoly&& other) noexcept = default;
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74 GenericGFPoly& operator=(const GenericGFPoly& other) {
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75 assert(_field == other._field);
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76 _coefficients.reserve(other._coefficients.size());
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77 _coefficients = other._coefficients;
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78 return *this;
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79 }
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81 GenericGFPoly(const GenericGFPoly& other) {
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82 _field = other._field;
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83 *this = other;
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84 }
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85
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86 GenericGFPoly& setField(const GenericGF& field)
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87 {
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88 _field = &field;
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89 return *this;
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90 }
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91 const GenericGF& field() const noexcept { return *_field; }
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92 const auto& coefficients() const noexcept { return _coefficients; }
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93
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94 /**
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95 * @return degree of this polynomial
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96 */
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97 int degree() const {
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98 return Size(_coefficients) - 1;
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99 }
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100
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101 /**
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102 * @return true iff this polynomial is the monomial "0"
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103 */
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104 bool isZero() const {
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105 return _coefficients[0] == 0;
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106 }
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107
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108 int leadingCoefficient() const noexcept {
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109 return _coefficients.front();
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110 }
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111
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112 int constant() const noexcept {
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113 return _coefficients.back();
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114 }
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115
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116 /**
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117 * @brief set to the monomial representing coefficient * x^degree
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118 */
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119 GenericGFPoly& setMonomial(int coefficient, int degree = 0)
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120 {
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121 assert(degree >= 0 && (coefficient != 0 || degree == 0));
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122
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123 _coefficients.resize(degree + 1);
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124 std::fill(_coefficients.begin(), _coefficients.end(), 0);
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125 _coefficients.front() = coefficient;
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126
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127 return *this;
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128 }
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129
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130 /**
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131 * @return evaluation of this polynomial at a given point
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132 */
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133 int evaluateAt(int a) const;
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134
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135 GenericGFPoly& addOrSubtract(GenericGFPoly& other);
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136 GenericGFPoly& multiply(const GenericGFPoly& other);
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137 GenericGFPoly& multiplyByMonomial(int coefficient, int degree = 0);
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138 GenericGFPoly& divide(const GenericGFPoly& other, GenericGFPoly& quotient);
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139
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140 friend void swap(GenericGFPoly& a, GenericGFPoly& b)
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141 {
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142 std::swap(a._field, b._field);
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143 std::swap(a._coefficients, b._coefficients);
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144 }
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145
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146 private:
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147 void normalize();
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148
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149 const GenericGF* _field = nullptr;
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150 Coefficients _coefficients, _cache; // _cache is used for malloc caching
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151 };
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152
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153 } // ZXing