Mercurial > hg > orthanc
annotate OrthancFramework/Sources/ChunkedBuffer.cpp @ 4792:434843934307 storage-cache
Added a StorageCache in the StorageAccessor
author | Alain Mazy <am@osimis.io> |
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date | Thu, 30 Sep 2021 12:14:19 +0200 |
parents | d9473bd5ed43 |
children | 7053502fbf97 |
rev | line source |
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0 | 1 /** |
59 | 2 * Orthanc - A Lightweight, RESTful DICOM Store |
1900 | 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 |
0 | 6 * |
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. |
136 | 11 * |
0 | 12 * This program is distributed in the hope that it will be useful, but |
13 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
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15 * Lesser General Public License for more details. |
0 | 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/>. |
0 | 20 **/ |
21 | |
22 | |
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23 #include "PrecompiledHeaders.h" |
0 | 24 #include "ChunkedBuffer.h" |
25 | |
26 #include <cassert> | |
27 #include <string.h> | |
28 | |
29 | |
59 | 30 namespace Orthanc |
0 | 31 { |
32 void ChunkedBuffer::Clear() | |
33 { | |
34 numBytes_ = 0; | |
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35 pendingPos_ = 0; |
0 | 36 |
37 for (Chunks::iterator it = chunks_.begin(); | |
656 | 38 it != chunks_.end(); ++it) |
0 | 39 { |
40 delete *it; | |
41 } | |
42 } | |
43 | |
44 | |
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45 void ChunkedBuffer::AddChunkInternal(const void* chunkData, |
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46 size_t chunkSize) |
0 | 47 { |
48 if (chunkSize == 0) | |
49 { | |
50 return; | |
51 } | |
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52 else |
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53 { |
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54 assert(chunkData != NULL); |
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55 chunks_.push_back(new std::string(reinterpret_cast<const char*>(chunkData), chunkSize)); |
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56 numBytes_ += chunkSize; |
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57 } |
0 | 58 } |
59 | |
60 | |
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61 void ChunkedBuffer::FlushPendingBuffer() |
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62 { |
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63 assert(pendingPos_ <= pendingBuffer_.size()); |
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64 |
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65 if (!pendingBuffer_.empty()) |
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66 { |
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67 AddChunkInternal(pendingBuffer_.c_str(), pendingPos_); |
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68 } |
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69 else |
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70 { |
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71 assert(pendingPos_ == 0); |
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72 } |
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73 |
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74 pendingPos_ = 0; |
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75 } |
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76 |
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77 |
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78 ChunkedBuffer::ChunkedBuffer() : |
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79 numBytes_(0), |
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80 pendingPos_(0) |
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81 { |
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82 pendingBuffer_.resize(16 * 1024); // Default size of the pending buffer: 16KB |
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83 } |
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84 |
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85 |
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86 ChunkedBuffer::~ChunkedBuffer() |
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87 { |
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88 Clear(); |
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89 } |
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90 |
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91 |
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92 size_t ChunkedBuffer::GetNumBytes() const |
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93 { |
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94 return numBytes_ + pendingPos_; |
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95 } |
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96 |
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97 |
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98 void ChunkedBuffer::SetPendingBufferSize(size_t size) |
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99 { |
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100 FlushPendingBuffer(); |
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101 pendingBuffer_.resize(size); |
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102 } |
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103 |
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104 |
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105 size_t ChunkedBuffer::GetPendingBufferSize() const |
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106 { |
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107 return pendingBuffer_.size(); |
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108 } |
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109 |
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110 |
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111 void ChunkedBuffer::AddChunk(const void* chunkData, |
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112 size_t chunkSize) |
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113 { |
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114 if (chunkSize > 0) |
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115 { |
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116 #if 1 |
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117 assert(sizeof(char) == 1); |
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118 |
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119 // Optimization if Orthanc >= 1.7.3, to speed up in the presence of many small chunks |
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120 if (pendingPos_ + chunkSize <= pendingBuffer_.size()) |
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121 { |
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122 // There remains enough place in the pending buffer |
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123 memcpy(&pendingBuffer_[pendingPos_], chunkData, chunkSize); |
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124 pendingPos_ += chunkSize; |
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125 } |
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126 else |
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127 { |
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128 FlushPendingBuffer(); |
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129 |
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130 if (!pendingBuffer_.empty() && |
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131 chunkSize < pendingBuffer_.size()) |
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132 { |
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133 memcpy(&pendingBuffer_[0], chunkData, chunkSize); |
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134 pendingPos_ = chunkSize; |
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135 } |
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136 else |
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137 { |
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138 AddChunkInternal(chunkData, chunkSize); |
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139 } |
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140 } |
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141 #else |
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142 // Non-optimized implementation in Orthanc <= 1.7.2 |
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143 AddChunkInternal(chunkData, chunkSize); |
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144 #endif |
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145 } |
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146 } |
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147 |
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148 |
874
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149 void ChunkedBuffer::AddChunk(const std::string& chunk) |
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150 { |
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151 if (chunk.size() > 0) |
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152 { |
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153 AddChunk(&chunk[0], chunk.size()); |
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154 } |
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155 } |
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156 |
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157 |
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158 void ChunkedBuffer::AddChunk(const std::string::const_iterator& begin, |
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159 const std::string::const_iterator& end) |
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160 { |
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161 const size_t s = end - begin; |
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162 |
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163 if (s > 0) |
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164 { |
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165 AddChunk(&begin[0], s); |
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166 } |
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167 } |
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168 |
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169 |
0 | 170 void ChunkedBuffer::Flatten(std::string& result) |
171 { | |
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172 FlushPendingBuffer(); |
0 | 173 result.resize(numBytes_); |
174 | |
175 size_t pos = 0; | |
176 for (Chunks::iterator it = chunks_.begin(); | |
656 | 177 it != chunks_.end(); ++it) |
0 | 178 { |
179 assert(*it != NULL); | |
180 | |
181 size_t s = (*it)->size(); | |
182 if (s != 0) | |
183 { | |
184 memcpy(&result[pos], (*it)->c_str(), s); | |
185 pos += s; | |
186 } | |
187 | |
188 delete *it; | |
189 } | |
190 | |
191 chunks_.clear(); | |
1921 | 192 numBytes_ = 0; |
0 | 193 } |
194 } |