annotate Core/Compression/ZlibCompressor.cpp @ 2105:d1bb4bbe9775

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Mon, 17 Oct 2016 12:17:22 +0200
parents b1291df2f780
children a3a65de1840f
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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
1900
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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 *
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6 * This program is free software: you can redistribute it and/or
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7 * modify it under the terms of the GNU General Public License as
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8 * published by the Free Software Foundation, either version 3 of the
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9 * License, or (at your option) any later version.
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10 *
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11 * In addition, as a special exception, the copyright holders of this
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12 * program give permission to link the code of its release with the
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13 * OpenSSL project's "OpenSSL" library (or with modified versions of it
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14 * that use the same license as the "OpenSSL" library), and distribute
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15 * the linked executables. You must obey the GNU General Public License
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16 * in all respects for all of the code used other than "OpenSSL". If you
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17 * modify file(s) with this exception, you may extend this exception to
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18 * your version of the file(s), but you are not obligated to do so. If
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19 * you do not wish to do so, delete this exception statement from your
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20 * version. If you delete this exception statement from all source files
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21 * in the program, then also delete it here.
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22 *
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23 * This program is distributed in the hope that it will be useful, but
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24 * WITHOUT ANY WARRANTY; without even the implied warranty of
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25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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26 * General Public License for more details.
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27 *
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28 * You should have received a copy of the GNU General Public License
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29 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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30 **/
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31
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32
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33 #include "../PrecompiledHeaders.h"
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34 #include "ZlibCompressor.h"
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35
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36 #include "../OrthancException.h"
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37 #include "../Logging.h"
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38
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39 #include <stdio.h>
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40 #include <string.h>
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41 #include <zlib.h>
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42
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43 namespace Orthanc
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44 {
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45 void ZlibCompressor::Compress(std::string& compressed,
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46 const void* uncompressed,
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47 size_t uncompressedSize)
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48 {
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49 if (uncompressedSize == 0)
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50 {
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51 compressed.clear();
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52 return;
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53 }
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54
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55 uLongf compressedSize = compressBound(uncompressedSize) + 1024 /* security margin */;
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56 if (compressedSize == 0)
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57 {
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58 compressedSize = 1;
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59 }
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60
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61 uint8_t* target;
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62 if (HasPrefixWithUncompressedSize())
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63 {
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64 compressed.resize(compressedSize + sizeof(uint64_t));
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65 target = reinterpret_cast<uint8_t*>(&compressed[0]) + sizeof(uint64_t);
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66 }
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67 else
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68 {
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69 compressed.resize(compressedSize);
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70 target = reinterpret_cast<uint8_t*>(&compressed[0]);
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71 }
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72
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73 int error = compress2(target,
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74 &compressedSize,
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75 const_cast<Bytef *>(static_cast<const Bytef *>(uncompressed)),
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76 uncompressedSize,
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77 GetCompressionLevel());
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78
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79 if (error != Z_OK)
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80 {
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81 compressed.clear();
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82
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83 switch (error)
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84 {
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85 case Z_MEM_ERROR:
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86 throw OrthancException(ErrorCode_NotEnoughMemory);
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88 default:
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89 throw OrthancException(ErrorCode_InternalError);
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90 }
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91 }
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92
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93 // The compression was successful
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94 if (HasPrefixWithUncompressedSize())
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95 {
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96 uint64_t s = static_cast<uint64_t>(uncompressedSize);
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97 memcpy(&compressed[0], &s, sizeof(uint64_t));
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98 compressed.resize(compressedSize + sizeof(uint64_t));
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99 }
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100 else
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101 {
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102 compressed.resize(compressedSize);
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103 }
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104 }
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106
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107 void ZlibCompressor::Uncompress(std::string& uncompressed,
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108 const void* compressed,
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109 size_t compressedSize)
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110 {
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111 if (compressedSize == 0)
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112 {
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113 uncompressed.clear();
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114 return;
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115 }
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116
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117 if (!HasPrefixWithUncompressedSize())
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118 {
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119 LOG(ERROR) << "Cannot guess the uncompressed size of a zlib-encoded buffer";
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120 throw OrthancException(ErrorCode_InternalError);
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121 }
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122
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123 uint64_t uncompressedSize = ReadUncompressedSizePrefix(compressed, compressedSize);
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124
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125 try
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126 {
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127 uncompressed.resize(static_cast<size_t>(uncompressedSize));
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128 }
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129 catch (...)
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130 {
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131 throw OrthancException(ErrorCode_NotEnoughMemory);
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132 }
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133
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134 uLongf tmp = static_cast<uLongf>(uncompressedSize);
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135 int error = uncompress
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136 (reinterpret_cast<uint8_t*>(&uncompressed[0]),
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137 &tmp,
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138 reinterpret_cast<const uint8_t*>(compressed) + sizeof(uint64_t),
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139 compressedSize - sizeof(uint64_t));
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140
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141 if (error != Z_OK)
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142 {
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143 uncompressed.clear();
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144
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145 switch (error)
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146 {
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147 case Z_DATA_ERROR:
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148 throw OrthancException(ErrorCode_CorruptedFile);
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150 case Z_MEM_ERROR:
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151 throw OrthancException(ErrorCode_NotEnoughMemory);
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153 default:
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154 throw OrthancException(ErrorCode_InternalError);
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155 }
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156 }
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157 }
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158 }