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annotate OrthancFramework/Sources/Compression/ZlibCompressor.cpp @ 4455:a8f554ca5ac6

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Explicitly use little-endian to encode uncompressed file size with zlib compression
author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 19 Jan 2021 14:31:04 +0100
parents d9473bd5ed43
children 0b2484663233
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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) 2017-2021 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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26 #include "../Endianness.h"
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27 #include "../OrthancException.h"
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28 #include "../Logging.h"
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29
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30 #include <stdio.h>
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31 #include <string.h>
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32 #include <zlib.h>
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33
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34 namespace Orthanc
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35 {
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36 ZlibCompressor::ZlibCompressor()
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37 {
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38 SetPrefixWithUncompressedSize(true);
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39 }
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40
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41 void ZlibCompressor::Compress(std::string& compressed,
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42 const void* uncompressed,
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43 size_t uncompressedSize)
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44 {
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45 if (uncompressedSize == 0)
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46 {
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47 compressed.clear();
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48 return;
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49 }
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50
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51 uLongf compressedSize = compressBound(static_cast<uLong>(uncompressedSize))
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52 + 1024 /* security margin */;
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53 if (compressedSize == 0)
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54 {
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55 compressedSize = 1;
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56 }
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57
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58 uint8_t* target;
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59 if (HasPrefixWithUncompressedSize())
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60 {
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61 compressed.resize(compressedSize + sizeof(uint64_t));
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62 target = reinterpret_cast<uint8_t*>(&compressed[0]) + sizeof(uint64_t);
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63 }
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64 else
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65 {
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66 compressed.resize(compressedSize);
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67 target = reinterpret_cast<uint8_t*>(&compressed[0]);
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68 }
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69
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70 int error = compress2(target,
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71 &compressedSize,
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72 const_cast<Bytef *>(static_cast<const Bytef *>(uncompressed)),
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73 static_cast<uLong>(uncompressedSize),
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74 GetCompressionLevel());
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75
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76 if (error != Z_OK)
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77 {
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78 compressed.clear();
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79
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80 switch (error)
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81 {
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82 case Z_MEM_ERROR:
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83 throw OrthancException(ErrorCode_NotEnoughMemory);
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84
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85 default:
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86 throw OrthancException(ErrorCode_InternalError);
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87 }
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88 }
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89
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90 // The compression was successful
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91 if (HasPrefixWithUncompressedSize())
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92 {
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93 uint64_t s = static_cast<uint64_t>(uncompressedSize);
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94
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95 // New in Orthanc 1.9.0: Explicitly use litte-endian encoding in size prefix
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96 s = htole64(s);
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97
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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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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 throw OrthancException(ErrorCode_InternalError,
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121 "Cannot guess the uncompressed size of a zlib-encoded buffer");
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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 // New in Orthanc 1.9.0: Explicitly use litte-endian encoding in size prefix
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136 uncompressedSize = le64toh(uncompressedSize);
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137
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138 uLongf tmp = static_cast<uLongf>(uncompressedSize);
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139 int error = uncompress
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140 (reinterpret_cast<uint8_t*>(&uncompressed[0]),
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141 &tmp,
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142 reinterpret_cast<const uint8_t*>(compressed) + sizeof(uint64_t),
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143 static_cast<uLong>(compressedSize - sizeof(uint64_t)));
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144
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145 if (error != Z_OK)
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146 {
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147 uncompressed.clear();
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148
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149 switch (error)
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150 {
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151 case Z_DATA_ERROR:
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152 throw OrthancException(ErrorCode_CorruptedFile);
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153
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154 case Z_MEM_ERROR:
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155 throw OrthancException(ErrorCode_NotEnoughMemory);
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156
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157 default:
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158 throw OrthancException(ErrorCode_InternalError);
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159 }
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160 }
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161 }
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162 }