Mercurial > hg > orthanc-stone
annotate Resources/Orthanc/Core/Compression/ZlibCompressor.cpp @ 208:db70f6c5fa4f
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author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Wed, 11 Apr 2018 16:27:09 +0200 |
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rev | line source |
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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) 2017-2018 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 #include "../PrecompiledHeaders.h" |
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35 #include "ZlibCompressor.h" |
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36 |
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37 #include "../OrthancException.h" |
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38 #include "../Logging.h" |
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39 |
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40 #include <stdio.h> |
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41 #include <string.h> |
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42 #include <zlib.h> |
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43 |
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44 namespace Orthanc |
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45 { |
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46 void ZlibCompressor::Compress(std::string& compressed, |
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47 const void* uncompressed, |
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48 size_t uncompressedSize) |
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49 { |
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50 if (uncompressedSize == 0) |
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51 { |
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52 compressed.clear(); |
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53 return; |
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54 } |
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55 |
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56 uLongf compressedSize = compressBound(uncompressedSize) + 1024 /* security margin */; |
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57 if (compressedSize == 0) |
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58 { |
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59 compressedSize = 1; |
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60 } |
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61 |
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62 uint8_t* target; |
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63 if (HasPrefixWithUncompressedSize()) |
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64 { |
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65 compressed.resize(compressedSize + sizeof(uint64_t)); |
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66 target = reinterpret_cast<uint8_t*>(&compressed[0]) + sizeof(uint64_t); |
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67 } |
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68 else |
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69 { |
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70 compressed.resize(compressedSize); |
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71 target = reinterpret_cast<uint8_t*>(&compressed[0]); |
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72 } |
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73 |
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74 int error = compress2(target, |
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75 &compressedSize, |
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76 const_cast<Bytef *>(static_cast<const Bytef *>(uncompressed)), |
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77 uncompressedSize, |
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78 GetCompressionLevel()); |
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79 |
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80 if (error != Z_OK) |
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81 { |
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82 compressed.clear(); |
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83 |
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84 switch (error) |
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85 { |
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86 case Z_MEM_ERROR: |
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87 throw OrthancException(ErrorCode_NotEnoughMemory); |
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88 |
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89 default: |
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90 throw OrthancException(ErrorCode_InternalError); |
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91 } |
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92 } |
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93 |
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94 // The compression was successful |
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95 if (HasPrefixWithUncompressedSize()) |
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96 { |
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97 uint64_t s = static_cast<uint64_t>(uncompressedSize); |
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98 memcpy(&compressed[0], &s, sizeof(uint64_t)); |
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99 compressed.resize(compressedSize + sizeof(uint64_t)); |
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100 } |
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101 else |
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102 { |
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103 compressed.resize(compressedSize); |
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104 } |
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105 } |
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106 |
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107 |
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108 void ZlibCompressor::Uncompress(std::string& uncompressed, |
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109 const void* compressed, |
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110 size_t compressedSize) |
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111 { |
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112 if (compressedSize == 0) |
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113 { |
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114 uncompressed.clear(); |
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115 return; |
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116 } |
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117 |
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118 if (!HasPrefixWithUncompressedSize()) |
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119 { |
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120 LOG(ERROR) << "Cannot guess the uncompressed size of a zlib-encoded buffer"; |
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121 throw OrthancException(ErrorCode_InternalError); |
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122 } |
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123 |
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124 uint64_t uncompressedSize = ReadUncompressedSizePrefix(compressed, compressedSize); |
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125 |
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126 try |
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127 { |
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128 uncompressed.resize(static_cast<size_t>(uncompressedSize)); |
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129 } |
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130 catch (...) |
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131 { |
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132 throw OrthancException(ErrorCode_NotEnoughMemory); |
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133 } |
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134 |
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135 uLongf tmp = static_cast<uLongf>(uncompressedSize); |
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136 int error = uncompress |
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137 (reinterpret_cast<uint8_t*>(&uncompressed[0]), |
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138 &tmp, |
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139 reinterpret_cast<const uint8_t*>(compressed) + sizeof(uint64_t), |
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140 compressedSize - sizeof(uint64_t)); |
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141 |
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142 if (error != Z_OK) |
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143 { |
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144 uncompressed.clear(); |
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145 |
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146 switch (error) |
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147 { |
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148 case Z_DATA_ERROR: |
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149 throw OrthancException(ErrorCode_CorruptedFile); |
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150 |
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151 case Z_MEM_ERROR: |
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152 throw OrthancException(ErrorCode_NotEnoughMemory); |
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153 |
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154 default: |
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155 throw OrthancException(ErrorCode_InternalError); |
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156 } |
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157 } |
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158 } |
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159 } |