Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/zxing-cpp/core/src/BitArray.h @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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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 * Copyright 2017 Axel Waggershauser
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5 */
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6 // SPDX-License-Identifier: Apache-2.0
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8 #pragma once
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10 #include "Range.h"
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11 #include "ZXAlgorithms.h"
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13 #include <algorithm>
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14 #include <cassert>
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15 #include <cstdint>
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16 #include <stdexcept>
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17 #include <type_traits>
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18 #include <vector>
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20 namespace ZXing {
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22 class ByteArray;
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24 /**
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25 * A simple, fast array of bits.
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26 */
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27 class BitArray
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28 {
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29 std::vector<uint8_t> _bits;
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31 friend class BitMatrix;
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33 // Nothing wrong to support it, just to make it explicit, instead of by mistake.
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34 // Use copy() below.
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35 BitArray(const BitArray &) = default;
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36 BitArray& operator=(const BitArray &) = delete;
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38 public:
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40 using Iterator = std::vector<uint8_t>::const_iterator;
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42 BitArray() = default;
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44 explicit BitArray(int size) : _bits(size, 0) {}
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46 BitArray(BitArray&& other) noexcept = default;
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47 BitArray& operator=(BitArray&& other) noexcept = default;
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49 BitArray copy() const { return *this; }
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51 int size() const noexcept { return Size(_bits); }
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53 int sizeInBytes() const noexcept { return (size() + 7) / 8; }
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55 bool get(int i) const { return _bits.at(i) != 0; }
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56 void set(int i, bool val) { _bits.at(i) = val; }
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58 // If you know exactly how may bits you are going to iterate
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59 // and that you access bit in sequence, iterator is faster than get().
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60 // However, be extremely careful since there is no check whatsoever.
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61 // (Performance is the reason for the iterator to exist in the first place.)
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62 Iterator iterAt(int i) const noexcept { return {_bits.cbegin() + i}; }
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63 Iterator begin() const noexcept { return _bits.cbegin(); }
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64 Iterator end() const noexcept { return _bits.cend(); }
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66 /**
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67 * Appends the least-significant bits, from value, in order from most-significant to
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68 * least-significant. For example, appending 6 bits from 0x000001E will append the bits
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69 * 0, 1, 1, 1, 1, 0 in that order.
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70 *
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71 * @param value {@code int} containing bits to append
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72 * @param numBits bits from value to append
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73 */
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74 void appendBits(int value, int numBits)
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75 {
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76 for (; numBits; --numBits)
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77 _bits.push_back((value >> (numBits-1)) & 1);
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78 }
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80 void appendBit(bool bit) { _bits.push_back(bit); }
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82 void appendBitArray(const BitArray& other) { _bits.insert(_bits.end(), other.begin(), other.end()); }
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84 /**
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85 * Reverses all bits in the array.
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86 */
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87 void reverse() { std::reverse(_bits.begin(), _bits.end()); }
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89 void bitwiseXOR(const BitArray& other);
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91 /**
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92 * @param bitOffset first bit to extract
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93 * @param numBytes how many bytes to extract (-1 == until the end, padded with '0')
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94 * @return Bytes are written most-significant bit first.
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95 */
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96 ByteArray toBytes(int bitOffset = 0, int numBytes = -1) const;
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98 using Range = ZXing::Range<Iterator>;
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99 Range range() const { return {begin(), end()}; }
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100
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diff changeset
101 friend bool operator==(const BitArray& a, const BitArray& b) { return a._bits == b._bits; }
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diff changeset
102 };
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103
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diff changeset
104 template<typename T, typename = std::enable_if_t<std::is_integral_v<T>>>
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diff changeset
105 T& AppendBit(T& val, bool bit)
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diff changeset
106 {
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diff changeset
107 return (val <<= 1) |= static_cast<T>(bit);
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108 }
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109
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diff changeset
110 template <typename ARRAY, typename = std::enable_if_t<std::is_integral_v<typename ARRAY::value_type>>>
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diff changeset
111 int ToInt(const ARRAY& a)
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112 {
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diff changeset
113 assert(Reduce(a) <= 32);
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114
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115 int pattern = 0;
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116 for (int i = 0; i < Size(a); i++)
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117 pattern = (pattern << a[i]) | ~(0xffffffff << a[i]) * (~i & 1);
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118 return pattern;
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119 }
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120
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121 template <typename T = int, typename = std::enable_if_t<std::is_integral_v<T>>>
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122 T ToInt(const BitArray& bits, int pos = 0, int count = 8 * sizeof(T))
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123 {
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124 assert(0 <= count && count <= 8 * (int)sizeof(T));
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125 assert(0 <= pos && pos + count <= bits.size());
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126
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127 count = std::min(count, bits.size());
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128 int res = 0;
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129 auto it = bits.iterAt(pos);
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130 for (int i = 0; i < count; ++i, ++it)
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131 AppendBit(res, *it);
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132
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133 return res;
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134 }
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135
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136 template <typename T = int, typename = std::enable_if_t<std::is_integral_v<T>>>
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137 std::vector<T> ToInts(const BitArray& bits, int wordSize, int totalWords, int offset = 0)
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138 {
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diff changeset
139 assert(totalWords >= bits.size() / wordSize);
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140 assert(wordSize <= 8 * (int)sizeof(T));
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141
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142 std::vector<T> res(totalWords, 0);
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diff changeset
143 for (int i = offset; i < bits.size(); i += wordSize)
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144 res[(i - offset) / wordSize] = ToInt(bits, i, wordSize);
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145
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146 return res;
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147 }
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148
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diff changeset
149 class BitArrayView
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150 {
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151 const BitArray& bits;
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diff changeset
152 BitArray::Iterator cur;
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153
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diff changeset
154 public:
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diff changeset
155 BitArrayView(const BitArray& bits) : bits(bits), cur(bits.begin()) {}
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156
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diff changeset
157 BitArrayView& skipBits(int n)
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diff changeset
158 {
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parents:
diff changeset
159 if (cur + n > bits.end())
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diff changeset
160 throw std::out_of_range("BitArrayView::skipBits() out of range.");
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diff changeset
161 cur += n;
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diff changeset
162 return *this;
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163 }
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diff changeset
164
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parents:
diff changeset
165 int peakBits(int n) const
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parents:
diff changeset
166 {
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parents:
diff changeset
167 assert(n <= 32);
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parents:
diff changeset
168 if (cur + n > bits.end())
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parents:
diff changeset
169 throw std::out_of_range("BitArrayView::peakBits() out of range.");
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parents:
diff changeset
170 int res = 0;
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parents:
diff changeset
171 for (auto i = cur; n > 0; --n, i++)
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parents:
diff changeset
172 AppendBit(res, *i);
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parents:
diff changeset
173 return res;
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parents:
diff changeset
174 }
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parents:
diff changeset
175
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parents:
diff changeset
176 int readBits(int n)
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parents:
diff changeset
177 {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
178 int res = peakBits(n);
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parents:
diff changeset
179 cur += n;
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diff changeset
180 return res;
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parents:
diff changeset
181 }
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parents:
diff changeset
182
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parents:
diff changeset
183 int size() const
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parents:
diff changeset
184 {
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parents:
diff changeset
185 return narrow_cast<int>(bits.end() - cur);
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parents:
diff changeset
186 }
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parents:
diff changeset
187
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parents:
diff changeset
188 explicit operator bool() const { return size(); }
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parents:
diff changeset
189 };
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190
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parents:
diff changeset
191 } // ZXing