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annotate OrthancFramework/Sources/Compression/ZipWriter.h @ 5013:c074a5827da9

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author Alain Mazy <am@osimis.io>
date Wed, 08 Jun 2022 15:46:24 +0200
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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24 #pragma once
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25
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26 #include "../OrthancFramework.h"
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28 #if !defined(ORTHANC_ENABLE_ZLIB)
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29 # error The macro ORTHANC_ENABLE_ZLIB must be defined
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30 #endif
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31
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32 #if ORTHANC_ENABLE_ZLIB != 1
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33 # error ZLIB support must be enabled to include this file
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34 #endif
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35
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36 #if ORTHANC_BUILD_UNIT_TESTS == 1
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37 # include <gtest/gtest_prod.h>
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38 #endif
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39
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40 #include "../ChunkedBuffer.h"
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41 #include "../Compatibility.h"
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42
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44 #include <stdint.h>
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45 #include <string>
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46 #include <boost/noncopyable.hpp>
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47 #include <boost/shared_ptr.hpp>
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48
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49 namespace Orthanc
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50 {
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51 class ORTHANC_PUBLIC ZipWriter : public boost::noncopyable
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52 {
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53 #if ORTHANC_BUILD_UNIT_TESTS == 1
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54 FRIEND_TEST(ZipWriter, BufferWithSeek);
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55 #endif
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56
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57 public:
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58 // New in Orthanc 1.9.4
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59 class ORTHANC_PUBLIC IOutputStream : public boost::noncopyable
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60 {
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61 public:
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62 virtual ~IOutputStream()
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63 {
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64 }
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65
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66 virtual void Write(const std::string& chunk) = 0;
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67
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68 virtual void Close() = 0;
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70 virtual uint64_t GetArchiveSize() const = 0;
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71 };
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72
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73
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74 // The lifetime of the "target" buffer must be larger than that of ZipWriter
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75 class ORTHANC_PUBLIC MemoryStream : public IOutputStream
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76 {
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77 private:
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78 std::string& target_;
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79 ChunkedBuffer chunked_;
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80 uint64_t archiveSize_;
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82 public:
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83 explicit MemoryStream(std::string& target);
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84
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85 virtual void Write(const std::string& chunk) ORTHANC_OVERRIDE;
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86
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87 virtual void Close() ORTHANC_OVERRIDE;
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89 virtual uint64_t GetArchiveSize() const ORTHANC_OVERRIDE;
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90 };
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91
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93 private:
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94 // This class is only public for unit tests
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95 class ORTHANC_PUBLIC BufferWithSeek : public boost::noncopyable
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96 {
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97 private:
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98 size_t currentPosition_;
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99 ChunkedBuffer chunks_;
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100 std::string flattened_;
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101
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102 void CheckInvariants() const;
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103
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104 public:
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105 BufferWithSeek();
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106
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107 ~BufferWithSeek();
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108
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109 size_t GetPosition() const;
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110
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111 size_t GetSize() const;
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112
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113 void Write(const void* data,
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114 size_t size);
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115
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116 void Write(const std::string& data);
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117
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118 void Seek(size_t position);
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119
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120 void Flush(std::string& target);
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121 };
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122
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123
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124 private:
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125 class StreamBuffer;
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126
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127 struct PImpl;
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128 boost::shared_ptr<PImpl> pimpl_;
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129
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130 bool isZip64_;
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131 bool hasFileInZip_;
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132 bool append_;
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133 uint8_t compressionLevel_;
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134 std::string path_;
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135
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136 std::unique_ptr<IOutputStream> outputStream_;
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137
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138 public:
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139 ZipWriter();
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140
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141 ~ZipWriter();
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142
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143 void SetZip64(bool isZip64);
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144
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145 bool IsZip64() const;
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146
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147 void SetCompressionLevel(uint8_t level);
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148
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149 uint8_t GetCompressionLevel() const;
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150
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151 void SetAppendToExisting(bool append);
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152
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153 bool IsAppendToExisting() const;
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154
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155 void Open();
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156
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157 void Close();
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158
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159 bool IsOpen() const;
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160
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161 void SetOutputPath(const char* path);
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162
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163 const std::string& GetOutputPath() const;
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164
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165 void OpenFile(const char* path);
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166
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167 void Write(const void* data, size_t length);
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168
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169 void Write(const std::string& data);
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170
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171 void AcquireOutputStream(IOutputStream* stream, // transfers ownership
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172 bool isZip64);
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173
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174 // The lifetime of the "target" buffer must be larger than that of ZipWriter
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175 void SetMemoryOutput(std::string& target,
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176 bool isZip64);
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177
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178 void CancelStream();
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180 // WARNING: "GetArchiveSize()" only has its final value after
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181 // "Close()" has been called
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182 uint64_t GetArchiveSize() const;
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183 };
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184 }