Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/zxing-cpp/core/src/GenericGF.cpp @ 24:21c6080bc183

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When building "_build.py": also handle Mercurial repositories. BUGS: Attribute names are left as-is.
author Franz Glasner <fzglas.hg@dom66.de>
date Fri, 19 Sep 2025 18:19:48 +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 #include "GenericGF.h"
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9 namespace ZXing {
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11 const GenericGF &
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12 GenericGF::AztecData12()
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13 {
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14 static GenericGF inst(0x1069, 4096, 1); // x^12 + x^6 + x^5 + x^3 + 1
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15 return inst;
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16 }
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18 const GenericGF &
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19 GenericGF::AztecData10()
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20 {
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21 static GenericGF inst(0x409, 1024, 1); // x^10 + x^3 + 1
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22 return inst;
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23 }
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24
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25 const GenericGF &
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26 GenericGF::AztecData6()
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27 {
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28 static GenericGF inst(0x43, 64, 1); // x^6 + x + 1
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29 return inst;
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30 }
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32 const GenericGF &
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33 GenericGF::AztecParam()
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34 {
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35 static GenericGF inst(0x13, 16, 1); // x^4 + x + 1
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36 return inst;
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37 }
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39 const GenericGF &
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40 GenericGF::QRCodeField256()
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41 {
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42 static GenericGF inst(0x011D, 256, 0); // x^8 + x^4 + x^3 + x^2 + 1
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43 return inst;
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44 }
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46 const GenericGF &
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47 GenericGF::DataMatrixField256()
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48 {
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49 static GenericGF inst(0x012D, 256, 1); // x^8 + x^5 + x^3 + x^2 + 1
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50 return inst;
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51 }
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53 const GenericGF &
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54 GenericGF::AztecData8()
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55 {
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56 static const GenericGF inst(0x012D, 256, 1); // = DATA_MATRIX_FIELD_256;
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57 return inst;
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58 }
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59
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60 const GenericGF &
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61 GenericGF::MaxiCodeField64()
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62 {
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63 static const GenericGF inst(0x43, 64, 1); // = AZTEC_DATA_6;
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64 return inst;
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65 }
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66
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67
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68 /**
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69 * Create a representation of GF(size) using the given primitive polynomial.
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70 *
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71 * @param primitive irreducible polynomial whose coefficients are represented by
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72 * the bits of an int, where the least-significant bit represents the constant
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73 * coefficient
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74 * @param size the size of the field
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75 * @param b the factor b in the generator polynomial can be 0- or 1-based
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76 * (g(x) = (x+a^b)(x+a^(b+1))...(x+a^(b+2t-1))).
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77 * In most cases it should be 1, but for QR code it is 0.
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78 */
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79 GenericGF::GenericGF(int primitive, int size, int b) :
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80 _size(size),
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81 _generatorBase(b)
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82 {
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83 #ifdef ZX_REED_SOLOMON_USE_MORE_MEMORY_FOR_SPEED
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84 _expTable.resize(size * 2, 0);
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85 #else
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86 _expTable.resize(size, 0);
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87 #endif
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88 _logTable.resize(size, 0);
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89 int x = 1;
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90 for (int i = 0; i < size; ++i) {
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91 _expTable[i] = x;
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92 x *= 2; // we're assuming the generator alpha is 2
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93 if (x >= size) {
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94 x ^= primitive;
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95 x &= size - 1;
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96 }
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97 }
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98
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99 #ifdef ZX_REED_SOLOMON_USE_MORE_MEMORY_FOR_SPEED
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100 for (int i = size - 1; i < size * 2; ++i)
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101 _expTable[i] = _expTable[i - (size - 1)];
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102 #endif
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103
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104 for (int i = 0; i < size - 1; ++i)
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105 _logTable[_expTable[i]] = i;
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106 // logTable[0] == 0 but this should never be used
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107 }
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108
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109 } // namespace ZXing