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annotate OrthancFramework/Sources/Compression/ZlibCompressor.cpp @ 4417:a4518adede59

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Mon, 28 Dec 2020 17:40:35 +0100
parents 785a2713323e
children d9473bd5ed43
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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 Lesser General Public License
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9 * as published by the Free Software Foundation, either version 3 of
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10 * the License, or (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * Lesser General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU Lesser General Public
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18 * License along with this program. If not, see
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19 * <http://www.gnu.org/licenses/>.
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20 **/
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22
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23 #include "../PrecompiledHeaders.h"
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24 #include "ZlibCompressor.h"
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25
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26 #include "../OrthancException.h"
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27 #include "../Logging.h"
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28
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29 #include <stdio.h>
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30 #include <string.h>
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31 #include <zlib.h>
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32
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33 namespace Orthanc
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34 {
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35 ZlibCompressor::ZlibCompressor()
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36 {
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37 SetPrefixWithUncompressedSize(true);
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38 }
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39
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40 void ZlibCompressor::Compress(std::string& compressed,
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41 const void* uncompressed,
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42 size_t uncompressedSize)
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43 {
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44 if (uncompressedSize == 0)
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45 {
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46 compressed.clear();
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47 return;
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48 }
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49
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50 uLongf compressedSize = compressBound(static_cast<uLong>(uncompressedSize))
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51 + 1024 /* security margin */;
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52 if (compressedSize == 0)
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53 {
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54 compressedSize = 1;
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55 }
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56
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57 uint8_t* target;
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58 if (HasPrefixWithUncompressedSize())
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59 {
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60 compressed.resize(compressedSize + sizeof(uint64_t));
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61 target = reinterpret_cast<uint8_t*>(&compressed[0]) + sizeof(uint64_t);
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62 }
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63 else
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64 {
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65 compressed.resize(compressedSize);
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66 target = reinterpret_cast<uint8_t*>(&compressed[0]);
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67 }
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68
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69 int error = compress2(target,
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70 &compressedSize,
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71 const_cast<Bytef *>(static_cast<const Bytef *>(uncompressed)),
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72 static_cast<uLong>(uncompressedSize),
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73 GetCompressionLevel());
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74
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75 if (error != Z_OK)
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76 {
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77 compressed.clear();
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78
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79 switch (error)
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80 {
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81 case Z_MEM_ERROR:
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82 throw OrthancException(ErrorCode_NotEnoughMemory);
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83
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84 default:
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85 throw OrthancException(ErrorCode_InternalError);
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86 }
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87 }
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88
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89 // The compression was successful
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90 if (HasPrefixWithUncompressedSize())
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91 {
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92 uint64_t s = static_cast<uint64_t>(uncompressedSize);
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93 memcpy(&compressed[0], &s, sizeof(uint64_t));
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94 compressed.resize(compressedSize + sizeof(uint64_t));
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95 }
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96 else
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97 {
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98 compressed.resize(compressedSize);
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99 }
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100 }
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102
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103 void ZlibCompressor::Uncompress(std::string& uncompressed,
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104 const void* compressed,
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105 size_t compressedSize)
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106 {
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107 if (compressedSize == 0)
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108 {
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109 uncompressed.clear();
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110 return;
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111 }
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112
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113 if (!HasPrefixWithUncompressedSize())
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114 {
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115 throw OrthancException(ErrorCode_InternalError,
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116 "Cannot guess the uncompressed size of a zlib-encoded buffer");
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117 }
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118
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119 uint64_t uncompressedSize = ReadUncompressedSizePrefix(compressed, compressedSize);
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120
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121 try
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122 {
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123 uncompressed.resize(static_cast<size_t>(uncompressedSize));
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124 }
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125 catch (...)
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126 {
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127 throw OrthancException(ErrorCode_NotEnoughMemory);
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128 }
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129
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130 uLongf tmp = static_cast<uLongf>(uncompressedSize);
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131 int error = uncompress
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132 (reinterpret_cast<uint8_t*>(&uncompressed[0]),
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133 &tmp,
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134 reinterpret_cast<const uint8_t*>(compressed) + sizeof(uint64_t),
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135 static_cast<uLong>(compressedSize - sizeof(uint64_t)));
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136
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137 if (error != Z_OK)
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138 {
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139 uncompressed.clear();
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140
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141 switch (error)
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142 {
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143 case Z_DATA_ERROR:
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144 throw OrthancException(ErrorCode_CorruptedFile);
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146 case Z_MEM_ERROR:
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147 throw OrthancException(ErrorCode_NotEnoughMemory);
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149 default:
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150 throw OrthancException(ErrorCode_InternalError);
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151 }
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152 }
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153 }
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154 }