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annotate OrthancFramework/Sources/Compression/ZlibCompressor.cpp @ 5115:0a9d36187a91

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author Alain Mazy <am@osimis.io>
date Fri, 02 Dec 2022 15:05:33 +0100
parents 43e613a7756b
children 0ea402b4d901
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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) 2017-2022 Osimis S.A., Belgium
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6 * Copyright (C) 2021-2022 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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23
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24 #include "../PrecompiledHeaders.h"
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25 #include "ZlibCompressor.h"
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27 #include "../Endianness.h"
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28 #include "../OrthancException.h"
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29 #include "../Logging.h"
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30
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31 #include <stdio.h>
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32 #include <string.h>
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33 #include <zlib.h>
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34
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35 namespace Orthanc
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36 {
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37 ZlibCompressor::ZlibCompressor()
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38 {
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39 SetPrefixWithUncompressedSize(true);
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40 }
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41
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42 void ZlibCompressor::Compress(std::string& compressed,
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43 const void* uncompressed,
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44 size_t uncompressedSize)
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45 {
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46 if (uncompressedSize == 0)
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47 {
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48 compressed.clear();
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49 return;
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50 }
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51
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52 uLongf compressedSize = compressBound(static_cast<uLong>(uncompressedSize))
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53 + 1024 /* security margin */;
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54 if (compressedSize == 0)
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55 {
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56 compressedSize = 1;
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57 }
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58
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59 uint8_t* target;
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60 if (HasPrefixWithUncompressedSize())
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61 {
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62 compressed.resize(compressedSize + sizeof(uint64_t));
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63 target = reinterpret_cast<uint8_t*>(&compressed[0]) + sizeof(uint64_t);
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64 }
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65 else
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66 {
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67 compressed.resize(compressedSize);
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68 target = reinterpret_cast<uint8_t*>(&compressed[0]);
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69 }
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70
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71 int error = compress2(target,
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72 &compressedSize,
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73 const_cast<Bytef *>(static_cast<const Bytef *>(uncompressed)),
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74 static_cast<uLong>(uncompressedSize),
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75 GetCompressionLevel());
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76
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77 if (error != Z_OK)
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78 {
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79 compressed.clear();
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80
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81 switch (error)
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82 {
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83 case Z_MEM_ERROR:
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84 throw OrthancException(ErrorCode_NotEnoughMemory);
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85
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86 default:
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87 throw OrthancException(ErrorCode_InternalError);
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88 }
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89 }
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90
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91 // The compression was successful
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92 if (HasPrefixWithUncompressedSize())
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93 {
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94 uint64_t s = static_cast<uint64_t>(uncompressedSize);
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95
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96 // New in Orthanc 1.9.0: Explicitly use litte-endian encoding in size prefix
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97 s = htole64(s);
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98
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99 memcpy(&compressed[0], &s, sizeof(uint64_t));
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100 compressed.resize(compressedSize + sizeof(uint64_t));
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101 }
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102 else
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103 {
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104 compressed.resize(compressedSize);
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105 }
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106 }
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107
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108
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109 void ZlibCompressor::Uncompress(std::string& uncompressed,
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110 const void* compressed,
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111 size_t compressedSize)
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112 {
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113 if (compressedSize == 0)
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114 {
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115 uncompressed.clear();
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116 return;
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117 }
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118
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119 if (!HasPrefixWithUncompressedSize())
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120 {
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121 throw OrthancException(ErrorCode_InternalError,
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122 "Cannot guess the uncompressed size of a zlib-encoded buffer");
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123 }
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124
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125 uint64_t uncompressedSize = ReadUncompressedSizePrefix(compressed, compressedSize);
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126
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127 // New in Orthanc 1.9.0: Explicitly use litte-endian encoding in size prefix
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128 uncompressedSize = le64toh(uncompressedSize);
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129
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130 try
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131 {
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132 uncompressed.resize(static_cast<size_t>(uncompressedSize));
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133 }
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134 catch (...)
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135 {
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136 throw OrthancException(ErrorCode_NotEnoughMemory);
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137 }
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138
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139 uLongf tmp = static_cast<uLongf>(uncompressedSize);
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140 int error = uncompress
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141 (reinterpret_cast<uint8_t*>(&uncompressed[0]),
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142 &tmp,
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143 reinterpret_cast<const uint8_t*>(compressed) + sizeof(uint64_t),
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144 static_cast<uLong>(compressedSize - sizeof(uint64_t)));
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145
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146 if (error != Z_OK)
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147 {
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148 uncompressed.clear();
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149
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150 switch (error)
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151 {
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152 case Z_DATA_ERROR:
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153 throw OrthancException(ErrorCode_CorruptedFile);
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154
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155 case Z_MEM_ERROR:
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156 throw OrthancException(ErrorCode_NotEnoughMemory);
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157
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158 default:
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159 throw OrthancException(ErrorCode_InternalError);
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160 }
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161 }
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162 }
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163 }