Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/zxing-cpp/core/src/BitHacks.h @ 20:eb3dd22fef2c

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FIX: the new "sdist" build target is PHONY also
author Franz Glasner <fzglas.hg@dom66.de>
date Thu, 18 Sep 2025 22:04:13 +0200
parents b50eed0cc0ef
children
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2
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1 /*
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2 * Copyright 2016 Huy Cuong Nguyen
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3 * Copyright 2017 Axel Waggershauser
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4 */
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5 // SPDX-License-Identifier: Apache-2.0
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6
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7 #pragma once
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8
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9 #include <cassert>
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10 #include <cstdint>
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11 #include <cstring>
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12 #include <vector>
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13
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14 // MSVC has the <bit> header but then warns about including it.
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15 // We check for _MSVC_LANG here as well, so client code is depending on /Zc:__cplusplus
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16 #if __has_include(<bit>) && (__cplusplus > 201703L || (defined(_MSVC_LANG) && _MSVC_LANG > 201703L))
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17 #include <bit>
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18 #if __cplusplus > 201703L && defined(__ANDROID__) // NDK 25.1.8937393 has the implementation but fails to advertise it
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19 #define __cpp_lib_bitops 201907L
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20 #endif
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21 #elif defined(_MSC_VER)
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22 // accoring to #863 MSVC defines __cpp_lib_bitops even when <bit> it not included and bitops are not available
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23 #undef __cpp_lib_bitops
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24 #endif
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25
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26 #if defined(__clang__) || defined(__GNUC__)
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27 #define ZX_HAS_GCC_BUILTINS
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28 #elif defined(_MSC_VER) && !defined(_M_ARM) && !defined(_M_ARM64)
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29 #include <intrin.h>
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30 #define ZX_HAS_MSC_BUILTINS
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31 #endif
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32
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33 namespace ZXing::BitHacks {
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34
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35 /**
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36 * The code below is taken from https://graphics.stanford.edu/~seander/bithacks.html
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37 * All credits go to Sean Eron Anderson and other authors mentioned in that page.
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38 */
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39
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40 /// <summary>
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41 /// Compute the number of zero bits on the left.
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42 /// </summary>
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43 template<typename T, typename = std::enable_if_t<std::is_integral_v<T>>>
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44 inline int NumberOfLeadingZeros(T x)
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45 {
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46 #ifdef __cpp_lib_bitops
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47 return std::countl_zero(static_cast<std::make_unsigned_t<T>>(x));
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48 #else
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49 if constexpr (sizeof(x) <= 4) {
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50 static_assert(sizeof(x) == 4, "NumberOfLeadingZeros not implemented for 8 and 16 bit ints.");
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51 if (x == 0)
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52 return 32;
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53 #ifdef ZX_HAS_GCC_BUILTINS
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54 return __builtin_clz(x);
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55 #elif defined(ZX_HAS_MSC_BUILTINS)
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56 unsigned long where;
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57 if (_BitScanReverse(&where, x))
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58 return 31 - static_cast<int>(where);
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59 return 32;
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60 #else
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61 int n = 0;
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62 if ((x & 0xFFFF0000) == 0) { n = n + 16; x = x << 16; }
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63 if ((x & 0xFF000000) == 0) { n = n + 8; x = x << 8; }
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64 if ((x & 0xF0000000) == 0) { n = n + 4; x = x << 4; }
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65 if ((x & 0xC0000000) == 0) { n = n + 2; x = x << 2; }
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66 if ((x & 0x80000000) == 0) { n = n + 1; }
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67 return n;
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68 #endif
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69 } else {
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70 if (x == 0)
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71 return 64;
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72 #ifdef ZX_HAS_GCC_BUILTINS
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73 return __builtin_clzll(x);
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74 #else // including ZX_HAS_MSC_BUILTINS
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75 int n = NumberOfLeadingZeros(static_cast<uint32_t>(x >> 32));
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76 if (n == 32)
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77 n += NumberOfLeadingZeros(static_cast<uint32_t>(x));
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78 return n;
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79 #endif
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80 }
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81 #endif
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82 }
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83
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84 /// <summary>
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85 /// Compute the number of zero bits on the right.
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86 /// </summary>
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87 template<typename T, typename = std::enable_if_t<std::is_integral_v<T>>>
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88 inline int NumberOfTrailingZeros(T v)
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89 {
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90 #ifdef __cpp_lib_bitops
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91 return std::countr_zero(static_cast<std::make_unsigned_t<T>>(v));
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92 #else
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93 if constexpr (sizeof(v) <= 4) {
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94 static_assert(sizeof(v) == 4, "NumberOfTrailingZeros not implemented for 8 and 16 bit ints.");
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95 #ifdef ZX_HAS_GCC_BUILTINS
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96 return v == 0 ? 32 : __builtin_ctz(v);
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97 #elif defined(ZX_HAS_MSC_BUILTINS)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
98 unsigned long where;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
99 if (_BitScanForward(&where, v))
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
100 return static_cast<int>(where);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
101 return 32;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
102 #else
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
103 int c = 32;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
104 v &= -int32_t(v);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
105 if (v) c--;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
106 if (v & 0x0000FFFF) c -= 16;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
107 if (v & 0x00FF00FF) c -= 8;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
108 if (v & 0x0F0F0F0F) c -= 4;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
109 if (v & 0x33333333) c -= 2;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
110 if (v & 0x55555555) c -= 1;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
111 return c;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
112 #endif
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parents:
diff changeset
113 } else {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
114 #ifdef ZX_HAS_GCC_BUILTINS
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Franz Glasner <fzglas.hg@dom66.de>
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diff changeset
115 return v == 0 ? 64 : __builtin_ctzll(v);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
116 #else // including ZX_HAS_MSC_BUILTINS
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
117 int n = NumberOfTrailingZeros(static_cast<uint32_t>(v));
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
118 if (n == 32)
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parents:
diff changeset
119 n += NumberOfTrailingZeros(static_cast<uint32_t>(v >> 32));
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
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120 return n;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
121 #endif
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122 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
123 #endif
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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124 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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125
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
126 inline uint32_t Reverse(uint32_t v)
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parents:
diff changeset
127 {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
128 #if 0
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parents:
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129 return __builtin_bitreverse32(v);
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parents:
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130 #else
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parents:
diff changeset
131 v = ((v >> 1) & 0x55555555) | ((v & 0x55555555) << 1);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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132 // swap consecutive pairs
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
133 v = ((v >> 2) & 0x33333333) | ((v & 0x33333333) << 2);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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134 // swap nibbles ...
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
135 v = ((v >> 4) & 0x0F0F0F0F) | ((v & 0x0F0F0F0F) << 4);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
136 // swap bytes
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
137 v = ((v >> 8) & 0x00FF00FF) | ((v & 0x00FF00FF) << 8);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
138 // swap 2-byte long pairs
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
139 v = (v >> 16) | (v << 16);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
140 return v;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
141 #endif
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parents:
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142 }
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parents:
diff changeset
143
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parents:
diff changeset
144 inline int CountBitsSet(uint32_t v)
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parents:
diff changeset
145 {
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parents:
diff changeset
146 #ifdef __cpp_lib_bitops
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
147 return std::popcount(v);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
148 #elif defined(ZX_HAS_GCC_BUILTINS)
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parents:
diff changeset
149 return __builtin_popcount(v);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
150 #else
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parents:
diff changeset
151 v = v - ((v >> 1) & 0x55555555); // reuse input as temporary
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
152 v = (v & 0x33333333) + ((v >> 2) & 0x33333333); // temp
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
153 return (((v + (v >> 4)) & 0xF0F0F0F) * 0x1010101) >> 24; // count
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
154 #endif
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parents:
diff changeset
155 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
156
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
157 // this is the same as log base 2 of v
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
158 inline int HighestBitSet(uint32_t v)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
159 {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
160 return 31 - NumberOfLeadingZeros(v);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
161 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
162
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
163 // shift a whole array of bits by offset bits to the right (thinking of the array as a contiguous stream of bits
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
164 // starting with the LSB of the first int and ending with the MSB of the last int, this is actually a left shift)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
165 template <typename T>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
166 void ShiftRight(std::vector<T>& bits, std::size_t offset)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
167 {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
168 assert(offset < sizeof(T) * 8);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
169
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
170 if (offset == 0 || bits.empty())
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
171 return;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
172
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
173 std::size_t leftOffset = sizeof(T) * 8 - offset;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
174 for (std::size_t i = 0; i < bits.size() - 1; ++i) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
175 bits[i] = (bits[i] >> offset) | (bits[i + 1] << leftOffset);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
176 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
177 bits.back() >>= offset;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
178 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
179
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
180 // reverse a whole array of bits. padding is the number of 'dummy' bits at the end of the array
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
181 template <typename T>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
182 void Reverse(std::vector<T>& bits, std::size_t padding)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
183 {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
184 static_assert(sizeof(T) == sizeof(uint32_t), "Reverse only implemented for 32 bit types");
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
185
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
186 // reverse all int's first (reversing the ints in the array and the bits in the ints at the same time)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
187 auto first = bits.begin(), last = bits.end();
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
188 for (; first < --last; ++first) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
189 auto t = *first;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
190 *first = BitHacks::Reverse(*last);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
191 *last = BitHacks::Reverse(t);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
192 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
193 if (first == last)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
194 *last = BitHacks::Reverse(*last);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
195
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
196 // now correct the int's if the bit size isn't a multiple of 32
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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197 ShiftRight(bits, padding);
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198 }
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199
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200 // use to avoid "load of misaligned address" when using a simple type cast
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201 template <typename T>
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202 T LoadU(const void* ptr)
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203 {
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204 static_assert(std::is_integral<T>::value, "T must be an integer");
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205 T res;
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206 memcpy(&res, ptr, sizeof(T));
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207 return res;
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208 }
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209
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210 } // namespace ZXing::BitHacks