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annotate OrthancFramework/Sources/Endianness.h @ 5308:1e23bfb0f732

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author Alain Mazy <am@osimis.io>
date Tue, 06 Jun 2023 17:04:23 +0200
parents 0ea402b4d901
children 59e3b6f8c5be
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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 * Copyright (C) 2017-2023 Osimis S.A., Belgium
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6 * Copyright (C) 2021-2023 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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7 *
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8 * This program is free software: you can redistribute it and/or
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9 * modify it under the terms of the GNU Lesser General Public License
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10 * as published by the Free Software Foundation, either version 3 of
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11 * the License, or (at your option) any later version.
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12 *
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13 * This program is distributed in the hope that it will be useful, but
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14 * WITHOUT ANY WARRANTY; without even the implied warranty of
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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16 * Lesser General Public License for more details.
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17 *
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18 * You should have received a copy of the GNU Lesser General Public
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19 * License along with this program. If not, see
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20 * <http://www.gnu.org/licenses/>.
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21 **/
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22
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23
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24 #pragma once
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25
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26
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27 /********************************************************************
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28 ** LINUX-LIKE ARCHITECTURES
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29 ********************************************************************/
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30
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31 #if defined(__LSB_VERSION__)
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32 // Linux Standard Base (LSB) does not come with be16toh, be32toh, and
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33 // be64toh
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34 # define ORTHANC_HAS_BUILTIN_BYTE_SWAP 0
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35 # include <endian.h>
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36 #elif defined(__linux__) || defined(__EMSCRIPTEN__)
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37 # define ORTHANC_HAS_BUILTIN_BYTE_SWAP 1
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38 # include <endian.h>
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39 #endif
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40
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41
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42 /********************************************************************
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43 ** WINDOWS ARCHITECTURES
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44 **
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45 ** On Windows x86, "host" will always be little-endian ("le").
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46 ********************************************************************/
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47
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48 #if defined(_WIN32)
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49 # if defined(_MSC_VER)
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50 // Visual Studio - http://msdn.microsoft.com/en-us/library/a3140177.aspx
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51 # define ORTHANC_HAS_BUILTIN_BYTE_SWAP 1
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52 # define be16toh(x) _byteswap_ushort(x)
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53 # define be32toh(x) _byteswap_ulong(x)
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54 # define be64toh(x) _byteswap_uint64(x)
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55 # elif (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3))
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56 // MinGW >= 4.3 - Use builtin intrinsic for byte swapping
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57 # define ORTHANC_HAS_BUILTIN_BYTE_SWAP 1
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58 # define be16toh(x) __builtin_bswap16(x)
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59 # define be32toh(x) __builtin_bswap32(x)
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60 # define be64toh(x) __builtin_bswap64(x)
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61 # else
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62 // MinGW <= 4.2, we must manually implement the byte swapping (*)
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63 # define ORTHANC_HAS_BUILTIN_BYTE_SWAP 0
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64 # define be16toh(x) __orthanc_bswap16(x)
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65 # define be32toh(x) __orthanc_bswap32(x)
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66 # define be64toh(x) __orthanc_bswap64(x)
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67 # endif
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68
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69 # define htobe16(x) be16toh(x)
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70 # define htobe32(x) be32toh(x)
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71 # define htobe64(x) be64toh(x)
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72
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73 # define htole16(x) x
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74 # define htole32(x) x
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75 # define htole64(x) x
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76
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77 # define le16toh(x) x
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78 # define le32toh(x) x
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79 # define le64toh(x) x
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80 #endif
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81
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82
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83 /********************************************************************
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84 ** FREEBSD ARCHITECTURES
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85 ********************************************************************/
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86
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87 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
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88 # define ORTHANC_HAS_BUILTIN_BYTE_SWAP 1
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89 # include <arpa/inet.h>
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90 #endif
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91
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92
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93 /********************************************************************
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94 ** OPENBSD ARCHITECTURES
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95 ********************************************************************/
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96
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97 #if defined(__OpenBSD__)
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98 # define ORTHANC_HAS_BUILTIN_BYTE_SWAP 1
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99 # include <endian.h>
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100 #endif
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101
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102
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103 /********************************************************************
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104 ** APPLE ARCHITECTURES (including OS X)
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105 ********************************************************************/
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106
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107 #if defined(__APPLE__)
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108 # define ORTHANC_HAS_BUILTIN_BYTE_SWAP 1
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109 # include <libkern/OSByteOrder.h>
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110 # define be16toh(x) OSSwapBigToHostInt16(x)
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111 # define be32toh(x) OSSwapBigToHostInt32(x)
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112 # define be64toh(x) OSSwapBigToHostInt64(x)
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113
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114 # define htobe16(x) OSSwapHostToBigInt16(x)
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115 # define htobe32(x) OSSwapHostToBigInt32(x)
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116 # define htobe64(x) OSSwapHostToBigInt64(x)
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117
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118 # define htole16(x) OSSwapHostToLittleInt16(x)
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119 # define htole32(x) OSSwapHostToLittleInt32(x)
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120 # define htole64(x) OSSwapHostToLittleInt64(x)
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121
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122 # define le16toh(x) OSSwapLittleToHostInt16(x)
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123 # define le32toh(x) OSSwapLittleToHostInt32(x)
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124 # define le64toh(x) OSSwapLittleToHostInt64(x)
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125 #endif
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126
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127
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128 /********************************************************************
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129 ** PORTABLE (BUT SLOW) IMPLEMENTATION OF BYTE-SWAPPING
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130 ********************************************************************/
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131
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132 #if ORTHANC_HAS_BUILTIN_BYTE_SWAP != 1
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133
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134 #include <stdint.h>
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135
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136 static inline uint16_t __orthanc_bswap16(uint16_t a)
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137 {
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138 /**
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139 * Note that an alternative implementation was included in Orthanc
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140 * 1.4.0 and 1.4.1:
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141 *
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142 * # hg log -p -r 2706
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143 *
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144 * This alternative implementation only hid an underlying problem
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145 * with pointer alignment on some architectures, and was thus
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146 * reverted. Check out issue #99:
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147 * https://bugs.orthanc-server.com/show_bug.cgi?id=99
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148 **/
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149 return (a << 8) | (a >> 8);
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150 }
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151
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152 static inline uint32_t __orthanc_bswap32(uint32_t a)
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153 {
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154 const uint8_t* p = reinterpret_cast<const uint8_t*>(&a);
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155 return (static_cast<uint32_t>(p[0]) << 24 |
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156 static_cast<uint32_t>(p[1]) << 16 |
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157 static_cast<uint32_t>(p[2]) << 8 |
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158 static_cast<uint32_t>(p[3]));
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159 }
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160
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161 static inline uint64_t __orthanc_bswap64(uint64_t a)
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162 {
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163 const uint8_t* p = reinterpret_cast<const uint8_t*>(&a);
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164 return (static_cast<uint64_t>(p[0]) << 56 |
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165 static_cast<uint64_t>(p[1]) << 48 |
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166 static_cast<uint64_t>(p[2]) << 40 |
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167 static_cast<uint64_t>(p[3]) << 32 |
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168 static_cast<uint64_t>(p[4]) << 24 |
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169 static_cast<uint64_t>(p[5]) << 16 |
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170 static_cast<uint64_t>(p[6]) << 8 |
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171 static_cast<uint64_t>(p[7]));
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172 }
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173
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174 #if defined(_WIN32)
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175 // Implemented above (*)
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176 #elif defined(__BYTE_ORDER) && defined(__LITTLE_ENDIAN) && defined(__BIG_ENDIAN)
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177 # if __BYTE_ORDER == __LITTLE_ENDIAN
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178 # define be16toh(x) __orthanc_bswap16(x)
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179 # define be32toh(x) __orthanc_bswap32(x)
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180 # define be64toh(x) __orthanc_bswap64(x)
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181 # define htobe16(x) __orthanc_bswap16(x)
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182 # define htobe32(x) __orthanc_bswap32(x)
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183 # define htobe64(x) __orthanc_bswap64(x)
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184 # define htole16(x) x
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185 # define htole32(x) x
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186 # define htole64(x) x
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187 # define le16toh(x) x
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188 # define le32toh(x) x
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189 # define le64toh(x) x
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190 # elif __BYTE_ORDER == __BIG_ENDIAN
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191 # define be16toh(x) x
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192 # define be32toh(x) x
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193 # define be64toh(x) x
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194 # define htobe16(x) x
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195 # define htobe32(x) x
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196 # define htobe64(x) x
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197 # define htole16(x) __orthanc_bswap16(x)
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198 # define htole32(x) __orthanc_bswap32(x)
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199 # define htole64(x) __orthanc_bswap64(x)
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200 # define le16toh(x) __orthanc_bswap16(x)
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201 # define le32toh(x) __orthanc_bswap32(x)
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202 # define le64toh(x) __orthanc_bswap64(x)
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203 # else
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204 # error Please support your platform here
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205 # endif
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206 #else
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207 # error Please support your platform here
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208 #endif
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209
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210 #endif