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annotate OrthancFramework/Sources/Compression/ZipWriter.h @ 4670:b12faca76a52

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support of output streams in ZipWriter
author Sebastien Jodogne <s.jodogne@gmail.com>
date Fri, 28 May 2021 18:26:40 +0200
parents d9473bd5ed43
children d9942d48fea7
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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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23 #pragma once
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24
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25 #include "../OrthancFramework.h"
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27 #if !defined(ORTHANC_ENABLE_ZLIB)
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28 # error The macro ORTHANC_ENABLE_ZLIB must be defined
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29 #endif
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30
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31 #if ORTHANC_ENABLE_ZLIB != 1
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32 # error ZLIB support must be enabled to include this file
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33 #endif
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34
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35 #if ORTHANC_BUILD_UNIT_TESTS == 1
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36 # include <gtest/gtest_prod.h>
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37 #endif
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38
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39 #include "../ChunkedBuffer.h"
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40 #include "../Compatibility.h"
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41
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43 #include <stdint.h>
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44 #include <string>
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45 #include <boost/noncopyable.hpp>
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46 #include <boost/shared_ptr.hpp>
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47
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48 namespace Orthanc
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49 {
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50 class ORTHANC_PUBLIC ZipWriter : public boost::noncopyable
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51 {
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52 #if ORTHANC_BUILD_UNIT_TESTS == 1
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53 FRIEND_TEST(ZipWriter, BufferWithSeek);
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54 #endif
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55
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56 public:
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57 // New in Orthanc 1.9.4
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58 class ORTHANC_PUBLIC IOutputStream : public boost::noncopyable
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59 {
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60 public:
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61 virtual ~IOutputStream()
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62 {
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63 }
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64
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65 virtual void Write(const std::string& chunk) = 0;
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66
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67 virtual void Close() = 0;
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68 };
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69
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70
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71 // The lifetime of the "target" buffer must be larger than that of ZipWriter
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72 class ORTHANC_PUBLIC MemoryStream : public IOutputStream
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73 {
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74 private:
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75 std::string& target_;
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76 ChunkedBuffer chunked_;
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78 public:
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79 MemoryStream(std::string& target);
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80
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81 virtual void Write(const std::string& chunk) ORTHANC_OVERRIDE;
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82
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83 virtual void Close() ORTHANC_OVERRIDE;
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84 };
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85
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86
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87 private:
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88 // This class is only public for unit tests
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89 class ORTHANC_PUBLIC BufferWithSeek : public boost::noncopyable
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90 {
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91 private:
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92 size_t currentPosition_;
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93 ChunkedBuffer chunks_;
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94 std::string flattened_;
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95
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96 void CheckInvariants() const;
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97
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98 public:
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99 BufferWithSeek();
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100
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101 ~BufferWithSeek();
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102
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103 size_t GetPosition() const;
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104
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105 size_t GetSize() const;
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106
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107 void Write(const void* data,
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108 size_t size);
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109
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110 void Write(const std::string& data);
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111
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112 void Seek(size_t position);
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113
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114 void Flush(std::string& target);
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115 };
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116
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117
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118 private:
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119 class StreamBuffer;
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120
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121 struct PImpl;
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122 boost::shared_ptr<PImpl> pimpl_;
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123
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124 bool isZip64_;
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125 bool hasFileInZip_;
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126 bool append_;
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127 uint8_t compressionLevel_;
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128 std::string path_;
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129
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130 std::unique_ptr<IOutputStream> outputStream_;
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131
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132 public:
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133 ZipWriter();
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134
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135 ~ZipWriter();
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136
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137 void SetZip64(bool isZip64);
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138
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139 bool IsZip64() const;
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140
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141 void SetCompressionLevel(uint8_t level);
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142
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143 uint8_t GetCompressionLevel() const;
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144
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145 void SetAppendToExisting(bool append);
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146
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147 bool IsAppendToExisting() const;
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148
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149 void Open();
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150
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151 void Close();
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152
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153 bool IsOpen() const;
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154
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155 void SetOutputPath(const char* path);
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156
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157 const std::string& GetOutputPath() const;
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158
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159 void OpenFile(const char* path);
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160
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161 void Write(const void* data, size_t length);
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162
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163 void Write(const std::string& data);
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164
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165 void AcquireOutputStream(IOutputStream* stream); // transfers ownership
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166
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167 // The lifetime of the "target" buffer must be larger than that of ZipWriter
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168 void SetMemoryOutput(std::string& target);
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169 };
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170 }