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annotate Core/Endianness.h @ 3929:7dc5e7e0045d transcoding

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simplifying MemoryBufferTranscoder::Transcode() interface
author Sebastien Jodogne <s.jodogne@gmail.com>
date Thu, 14 May 2020 14:40:13 +0200
parents 94f4a18a79cc
children
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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) 2017-2020 Osimis S.A., Belgium
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6 *
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7 * This program is free software: you can redistribute it and/or
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8 * modify it under the terms of the GNU General Public License as
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9 * published by the Free Software Foundation, either version 3 of the
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10 * License, or (at your option) any later version.
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11 *
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12 * In addition, as a special exception, the copyright holders of this
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13 * program give permission to link the code of its release with the
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14 * OpenSSL project's "OpenSSL" library (or with modified versions of it
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15 * that use the same license as the "OpenSSL" library), and distribute
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16 * the linked executables. You must obey the GNU General Public License
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17 * in all respects for all of the code used other than "OpenSSL". If you
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18 * modify file(s) with this exception, you may extend this exception to
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19 * your version of the file(s), but you are not obligated to do so. If
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20 * you do not wish to do so, delete this exception statement from your
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21 * version. If you delete this exception statement from all source files
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22 * in the program, then also delete it here.
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23 *
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24 * This program is distributed in the hope that it will be useful, but
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25 * WITHOUT ANY WARRANTY; without even the implied warranty of
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26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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27 * General Public License for more details.
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28 *
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29 * You should have received a copy of the GNU General Public License
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30 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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31 **/
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32
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33
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34 #pragma once
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35
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36
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37 /********************************************************************
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38 ** LINUX-LIKE ARCHITECTURES
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39 ********************************************************************/
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40
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41 #if defined(__LSB_VERSION__)
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42 // Linux Standard Base (LSB) does not come with be16toh, be32toh, and
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43 // be64toh
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44 # define ORTHANC_HAS_BUILTIN_BYTE_SWAP 0
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45 # include <endian.h>
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46 #elif defined(__linux__) || defined(__EMSCRIPTEN__)
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47 # define ORTHANC_HAS_BUILTIN_BYTE_SWAP 1
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48 # include <endian.h>
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49 #endif
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50
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51
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52 /********************************************************************
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53 ** WINDOWS ARCHITECTURES
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54 **
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55 ** On Windows x86, "host" will always be little-endian ("le").
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56 ********************************************************************/
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57
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58 #if defined(_WIN32)
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59 # if defined(_MSC_VER)
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60 // Visual Studio - http://msdn.microsoft.com/en-us/library/a3140177.aspx
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61 # define ORTHANC_HAS_BUILTIN_BYTE_SWAP 1
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62 # define be16toh(x) _byteswap_ushort(x)
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63 # define be32toh(x) _byteswap_ulong(x)
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64 # define be64toh(x) _byteswap_uint64(x)
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65 # elif (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3))
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66 // MinGW >= 4.3 - Use builtin intrinsic for byte swapping
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67 # define ORTHANC_HAS_BUILTIN_BYTE_SWAP 1
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68 # define be16toh(x) __builtin_bswap16(x)
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69 # define be32toh(x) __builtin_bswap32(x)
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70 # define be64toh(x) __builtin_bswap64(x)
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71 # else
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72 // MinGW <= 4.2, we must manually implement the byte swapping (*)
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73 # define ORTHANC_HAS_BUILTIN_BYTE_SWAP 0
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74 # define be16toh(x) __orthanc_bswap16(x)
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75 # define be32toh(x) __orthanc_bswap32(x)
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76 # define be64toh(x) __orthanc_bswap64(x)
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77 # endif
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78
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79 # define htobe16(x) be16toh(x)
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80 # define htobe32(x) be32toh(x)
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81 # define htobe64(x) be64toh(x)
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82
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83 # define htole16(x) x
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84 # define htole32(x) x
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85 # define htole64(x) x
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86
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87 # define le16toh(x) x
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88 # define le32toh(x) x
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89 # define le64toh(x) x
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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 ** FREEBSD ARCHITECTURES
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95 ********************************************************************/
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96
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97 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
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98 # define ORTHANC_HAS_BUILTIN_BYTE_SWAP 1
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99 # include <arpa/inet.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 ** OPENBSD ARCHITECTURES
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105 ********************************************************************/
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106
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107 #if defined(__OpenBSD__)
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108 # define ORTHANC_HAS_BUILTIN_BYTE_SWAP 1
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109 # include <endian.h>
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110 #endif
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111
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112
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113 /********************************************************************
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114 ** APPLE ARCHITECTURES (including OS X)
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115 ********************************************************************/
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116
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117 #if defined(__APPLE__)
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118 # define ORTHANC_HAS_BUILTIN_BYTE_SWAP 1
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119 # include <libkern/OSByteOrder.h>
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120 # define be16toh(x) OSSwapBigToHostInt16(x)
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121 # define be32toh(x) OSSwapBigToHostInt32(x)
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122 # define be64toh(x) OSSwapBigToHostInt64(x)
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123
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124 # define htobe16(x) OSSwapHostToBigInt16(x)
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125 # define htobe32(x) OSSwapHostToBigInt32(x)
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126 # define htobe64(x) OSSwapHostToBigInt64(x)
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127
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128 # define htole16(x) OSSwapHostToLittleInt16(x)
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129 # define htole32(x) OSSwapHostToLittleInt32(x)
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130 # define htole64(x) OSSwapHostToLittleInt64(x)
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131
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132 # define le16toh(x) OSSwapLittleToHostInt16(x)
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133 # define le32toh(x) OSSwapLittleToHostInt32(x)
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134 # define le64toh(x) OSSwapLittleToHostInt64(x)
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135 #endif
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136
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137
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138 /********************************************************************
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139 ** PORTABLE (BUT SLOW) IMPLEMENTATION OF BYTE-SWAPPING
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140 ********************************************************************/
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141
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142 #if ORTHANC_HAS_BUILTIN_BYTE_SWAP != 1
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143
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144 #include <stdint.h>
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145
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146 static inline uint16_t __orthanc_bswap16(uint16_t a)
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147 {
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148 /**
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149 * Note that an alternative implementation was included in Orthanc
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150 * 1.4.0 and 1.4.1:
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151 *
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152 * # hg log -p -r 2706
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153 *
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154 * This alternative implementation only hid an underlying problem
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155 * with pointer alignment on some architectures, and was thus
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156 * reverted. Check out issue #99:
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157 * https://bitbucket.org/sjodogne/orthanc/issues/99
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158 **/
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159 return (a << 8) | (a >> 8);
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160 }
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161
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162 static inline uint32_t __orthanc_bswap32(uint32_t a)
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163 {
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164 const uint8_t* p = reinterpret_cast<const uint8_t*>(&a);
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165 return (static_cast<uint32_t>(p[0]) << 24 |
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166 static_cast<uint32_t>(p[1]) << 16 |
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167 static_cast<uint32_t>(p[2]) << 8 |
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168 static_cast<uint32_t>(p[3]));
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169 }
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170
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171 static inline uint64_t __orthanc_bswap64(uint64_t a)
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172 {
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173 const uint8_t* p = reinterpret_cast<const uint8_t*>(&a);
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174 return (static_cast<uint64_t>(p[0]) << 56 |
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175 static_cast<uint64_t>(p[1]) << 48 |
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176 static_cast<uint64_t>(p[2]) << 40 |
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177 static_cast<uint64_t>(p[3]) << 32 |
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178 static_cast<uint64_t>(p[4]) << 24 |
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179 static_cast<uint64_t>(p[5]) << 16 |
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180 static_cast<uint64_t>(p[6]) << 8 |
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181 static_cast<uint64_t>(p[7]));
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182 }
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183
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184 #if defined(_WIN32)
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185 // Implemented above (*)
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186 #elif defined(__BYTE_ORDER) && defined(__LITTLE_ENDIAN) && defined(__BIG_ENDIAN)
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187 # if __BYTE_ORDER == __LITTLE_ENDIAN
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188 # define be16toh(x) __orthanc_bswap16(x)
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189 # define be32toh(x) __orthanc_bswap32(x)
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190 # define be64toh(x) __orthanc_bswap64(x)
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191 # define htobe16(x) __orthanc_bswap16(x)
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192 # define htobe32(x) __orthanc_bswap32(x)
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193 # define htobe64(x) __orthanc_bswap64(x)
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194 # define htole16(x) x
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195 # define htole32(x) x
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196 # define htole64(x) x
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197 # define le16toh(x) x
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198 # define le32toh(x) x
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199 # define le64toh(x) x
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200 # elif __BYTE_ORDER == __BIG_ENDIAN
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201 # define be16toh(x) x
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202 # define be32toh(x) x
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203 # define be64toh(x) x
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204 # define htobe16(x) x
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205 # define htobe32(x) x
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206 # define htobe64(x) x
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207 # define htole16(x) __orthanc_bswap16(x)
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208 # define htole32(x) __orthanc_bswap32(x)
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209 # define htole64(x) __orthanc_bswap64(x)
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210 # define le16toh(x) __orthanc_bswap16(x)
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211 # define le32toh(x) __orthanc_bswap32(x)
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212 # define le64toh(x) __orthanc_bswap64(x)
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213 # else
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214 # error Please support your platform here
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215 # endif
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216 #else
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217 # error Please support your platform here
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218 #endif
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219
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220 #endif