Mercurial > hg > orthanc-stone
annotate Resources/Orthanc/Core/Compression/GzipCompressor.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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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 "GzipCompressor.h" |
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36 |
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37 #include <stdio.h> |
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38 #include <string.h> |
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39 #include <zlib.h> |
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40 |
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41 #include "../OrthancException.h" |
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42 #include "../Logging.h" |
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43 |
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44 namespace Orthanc |
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45 { |
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46 uint64_t GzipCompressor::GuessUncompressedSize(const void* compressed, |
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47 size_t compressedSize) |
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48 { |
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49 /** |
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50 * "Is there a way to find out the size of the original file which |
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51 * is inside a GZIP file? [...] There is no truly reliable way, |
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52 * other than gunzipping the stream. You do not need to save the |
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53 * result of the decompression, so you can determine the size by |
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54 * simply reading and decoding the entire file without taking up |
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55 * space with the decompressed result. |
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56 * |
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57 * There is an unreliable way to determine the uncompressed size, |
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58 * which is to look at the last four bytes of the gzip file, which |
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59 * is the uncompressed length of that entry modulo 232 in little |
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60 * endian order. |
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61 * |
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62 * It is unreliable because a) the uncompressed data may be longer |
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63 * than 2^32 bytes, and b) the gzip file may consist of multiple |
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64 * gzip streams, in which case you would find the length of only |
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65 * the last of those streams. |
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66 * |
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67 * If you are in control of the source of the gzip files, you know |
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68 * that they consist of single gzip streams, and you know that |
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69 * they are less than 2^32 bytes uncompressed, then and only then |
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70 * can you use those last four bytes with confidence." |
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71 * |
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72 * http://stackoverflow.com/a/9727599/881731 |
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73 **/ |
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74 |
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75 if (compressedSize < 4) |
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76 { |
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77 throw OrthancException(ErrorCode_BadFileFormat); |
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78 } |
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79 |
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80 const uint8_t* p = reinterpret_cast<const uint8_t*>(compressed) + compressedSize - 4; |
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81 |
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82 return ((static_cast<uint32_t>(p[0]) << 0) + |
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83 (static_cast<uint32_t>(p[1]) << 8) + |
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84 (static_cast<uint32_t>(p[2]) << 16) + |
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85 (static_cast<uint32_t>(p[3]) << 24)); |
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86 } |
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87 |
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88 |
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89 |
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90 void GzipCompressor::Compress(std::string& compressed, |
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91 const void* uncompressed, |
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92 size_t uncompressedSize) |
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93 { |
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94 uLongf compressedSize = compressBound(uncompressedSize) + 1024 /* security margin */; |
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95 if (compressedSize == 0) |
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96 { |
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97 compressedSize = 1; |
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98 } |
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99 |
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100 uint8_t* target; |
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101 if (HasPrefixWithUncompressedSize()) |
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102 { |
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103 compressed.resize(compressedSize + sizeof(uint64_t)); |
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104 target = reinterpret_cast<uint8_t*>(&compressed[0]) + sizeof(uint64_t); |
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105 } |
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106 else |
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107 { |
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108 compressed.resize(compressedSize); |
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109 target = reinterpret_cast<uint8_t*>(&compressed[0]); |
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110 } |
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111 |
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112 z_stream stream; |
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113 memset(&stream, 0, sizeof(stream)); |
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114 |
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115 stream.next_in = const_cast<Bytef*>(reinterpret_cast<const Bytef*>(uncompressed)); |
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116 stream.next_out = reinterpret_cast<Bytef*>(target); |
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117 |
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118 stream.avail_in = static_cast<uInt>(uncompressedSize); |
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119 stream.avail_out = static_cast<uInt>(compressedSize); |
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120 |
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121 // Ensure no overflow (if the buffer is too large for the current archicture) |
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122 if (static_cast<size_t>(stream.avail_in) != uncompressedSize || |
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123 static_cast<size_t>(stream.avail_out) != compressedSize) |
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124 { |
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125 throw OrthancException(ErrorCode_NotEnoughMemory); |
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126 } |
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127 |
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128 // Initialize the compression engine |
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129 int error = deflateInit2(&stream, |
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130 GetCompressionLevel(), |
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131 Z_DEFLATED, |
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132 MAX_WBITS + 16, // ask for gzip output |
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133 8, // default memory level |
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134 Z_DEFAULT_STRATEGY); |
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135 |
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136 if (error != Z_OK) |
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137 { |
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138 // Cannot initialize zlib |
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139 compressed.clear(); |
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140 throw OrthancException(ErrorCode_InternalError); |
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141 } |
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142 |
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143 // Compress the input buffer |
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144 error = deflate(&stream, Z_FINISH); |
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145 |
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146 if (error != Z_STREAM_END) |
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147 { |
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148 deflateEnd(&stream); |
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149 compressed.clear(); |
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150 |
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151 switch (error) |
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152 { |
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153 case Z_MEM_ERROR: |
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154 throw OrthancException(ErrorCode_NotEnoughMemory); |
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155 |
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156 default: |
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157 throw OrthancException(ErrorCode_InternalError); |
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158 } |
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159 } |
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160 |
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161 size_t size = stream.total_out; |
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162 |
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163 if (deflateEnd(&stream) != Z_OK) |
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164 { |
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165 throw OrthancException(ErrorCode_InternalError); |
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166 } |
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167 |
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168 // The compression was successful |
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169 if (HasPrefixWithUncompressedSize()) |
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170 { |
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171 uint64_t s = static_cast<uint64_t>(uncompressedSize); |
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172 memcpy(&compressed[0], &s, sizeof(uint64_t)); |
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173 compressed.resize(size + sizeof(uint64_t)); |
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174 } |
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175 else |
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176 { |
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177 compressed.resize(size); |
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178 } |
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179 } |
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180 |
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181 |
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182 void GzipCompressor::Uncompress(std::string& uncompressed, |
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183 const void* compressed, |
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184 size_t compressedSize) |
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185 { |
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186 uint64_t uncompressedSize; |
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187 const uint8_t* source = reinterpret_cast<const uint8_t*>(compressed); |
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188 |
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189 if (HasPrefixWithUncompressedSize()) |
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190 { |
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191 uncompressedSize = ReadUncompressedSizePrefix(compressed, compressedSize); |
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192 source += sizeof(uint64_t); |
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193 compressedSize -= sizeof(uint64_t); |
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194 } |
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195 else |
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196 { |
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197 uncompressedSize = GuessUncompressedSize(compressed, compressedSize); |
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198 } |
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199 |
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200 try |
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201 { |
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202 uncompressed.resize(static_cast<size_t>(uncompressedSize)); |
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203 } |
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204 catch (...) |
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205 { |
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206 throw OrthancException(ErrorCode_NotEnoughMemory); |
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207 } |
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208 |
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209 z_stream stream; |
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210 memset(&stream, 0, sizeof(stream)); |
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211 |
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212 char dummy = '\0'; // zlib does not like NULL output buffers (even if the uncompressed data is empty) |
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213 stream.next_in = const_cast<Bytef*>(source); |
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214 stream.next_out = reinterpret_cast<Bytef*>(uncompressedSize == 0 ? &dummy : &uncompressed[0]); |
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215 |
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216 stream.avail_in = static_cast<uInt>(compressedSize); |
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217 stream.avail_out = static_cast<uInt>(uncompressedSize); |
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218 |
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219 // Ensure no overflow (if the buffer is too large for the current archicture) |
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220 if (static_cast<size_t>(stream.avail_in) != compressedSize || |
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221 static_cast<size_t>(stream.avail_out) != uncompressedSize) |
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222 { |
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223 throw OrthancException(ErrorCode_NotEnoughMemory); |
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224 } |
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225 |
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226 // Initialize the compression engine |
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227 int error = inflateInit2(&stream, |
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228 MAX_WBITS + 16); // this is a gzip input |
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229 |
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230 if (error != Z_OK) |
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231 { |
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232 // Cannot initialize zlib |
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233 uncompressed.clear(); |
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234 throw OrthancException(ErrorCode_InternalError); |
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235 } |
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236 |
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237 // Uncompress the input buffer |
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238 error = inflate(&stream, Z_FINISH); |
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239 |
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240 if (error != Z_STREAM_END) |
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241 { |
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242 inflateEnd(&stream); |
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243 uncompressed.clear(); |
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244 |
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245 switch (error) |
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246 { |
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247 case Z_MEM_ERROR: |
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248 throw OrthancException(ErrorCode_NotEnoughMemory); |
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249 |
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250 case Z_BUF_ERROR: |
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251 case Z_NEED_DICT: |
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252 throw OrthancException(ErrorCode_BadFileFormat); |
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253 |
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254 default: |
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255 throw OrthancException(ErrorCode_InternalError); |
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256 } |
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257 } |
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258 |
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259 size_t size = stream.total_out; |
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260 |
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261 if (inflateEnd(&stream) != Z_OK) |
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262 { |
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263 uncompressed.clear(); |
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264 throw OrthancException(ErrorCode_InternalError); |
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265 } |
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266 |
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267 if (size != uncompressedSize) |
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268 { |
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269 uncompressed.clear(); |
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270 |
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271 // The uncompressed size was not that properly guess, presumably |
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272 // because of a file size over 4GB. Should fallback to |
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273 // stream-based decompression. |
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274 LOG(ERROR) << "The uncompressed size of a gzip-encoded buffer was not properly guessed"; |
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275 throw OrthancException(ErrorCode_NotImplemented); |
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276 } |
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277 } |
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278 } |