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annotate OrthancFramework/Sources/ChunkedBuffer.cpp @ 5185:0ea402b4d901

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Sat, 25 Mar 2023 12:27:21 +0100
parents 43e613a7756b
children 48b8dae6dc77
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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) 2017-2023 Osimis S.A., Belgium
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6 * Copyright (C) 2021-2023 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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23
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24 #include "PrecompiledHeaders.h"
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25 #include "ChunkedBuffer.h"
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27 #include <cassert>
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28 #include <string.h>
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30
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31 namespace Orthanc
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32 {
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33 void ChunkedBuffer::Clear()
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34 {
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35 numBytes_ = 0;
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36 pendingPos_ = 0;
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37
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38 for (Chunks::iterator it = chunks_.begin();
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39 it != chunks_.end(); ++it)
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40 {
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41 delete *it;
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42 }
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43 }
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45
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46 void ChunkedBuffer::AddChunkInternal(const void* chunkData,
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47 size_t chunkSize)
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48 {
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49 if (chunkSize == 0)
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50 {
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51 return;
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52 }
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53 else
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54 {
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55 assert(chunkData != NULL);
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56 chunks_.push_back(new std::string(reinterpret_cast<const char*>(chunkData), chunkSize));
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57 numBytes_ += chunkSize;
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58 }
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59 }
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61
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62 void ChunkedBuffer::FlushPendingBuffer()
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63 {
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64 assert(pendingPos_ <= pendingBuffer_.size());
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65
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66 if (!pendingBuffer_.empty())
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67 {
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68 AddChunkInternal(pendingBuffer_.c_str(), pendingPos_);
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69 }
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70 else
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71 {
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72 assert(pendingPos_ == 0);
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73 }
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75 pendingPos_ = 0;
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76 }
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79 ChunkedBuffer::ChunkedBuffer() :
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80 numBytes_(0),
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81 pendingPos_(0)
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82 {
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83 pendingBuffer_.resize(16 * 1024); // Default size of the pending buffer: 16KB
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84 }
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85
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86
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87 ChunkedBuffer::~ChunkedBuffer()
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88 {
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89 Clear();
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90 }
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93 size_t ChunkedBuffer::GetNumBytes() const
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94 {
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95 return numBytes_ + pendingPos_;
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96 }
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98
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99 void ChunkedBuffer::SetPendingBufferSize(size_t size)
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100 {
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101 FlushPendingBuffer();
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102 pendingBuffer_.resize(size);
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103 }
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104
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105
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106 size_t ChunkedBuffer::GetPendingBufferSize() const
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107 {
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108 return pendingBuffer_.size();
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109 }
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110
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111
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112 void ChunkedBuffer::AddChunk(const void* chunkData,
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113 size_t chunkSize)
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114 {
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115 if (chunkSize > 0)
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116 {
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117 #if 1
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118 assert(sizeof(char) == 1);
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119
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120 // Optimization if Orthanc >= 1.7.3, to speed up in the presence of many small chunks
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121 if (pendingPos_ + chunkSize <= pendingBuffer_.size())
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122 {
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123 // There remains enough place in the pending buffer
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124 memcpy(&pendingBuffer_[pendingPos_], chunkData, chunkSize);
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125 pendingPos_ += chunkSize;
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126 }
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127 else
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128 {
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129 FlushPendingBuffer();
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130
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131 if (!pendingBuffer_.empty() &&
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132 chunkSize < pendingBuffer_.size())
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133 {
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134 memcpy(&pendingBuffer_[0], chunkData, chunkSize);
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135 pendingPos_ = chunkSize;
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136 }
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137 else
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138 {
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139 AddChunkInternal(chunkData, chunkSize);
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140 }
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141 }
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142 #else
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143 // Non-optimized implementation in Orthanc <= 1.7.2
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144 AddChunkInternal(chunkData, chunkSize);
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145 #endif
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146 }
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147 }
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148
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149
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150 void ChunkedBuffer::AddChunk(const std::string& chunk)
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151 {
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152 if (chunk.size() > 0)
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153 {
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154 AddChunk(&chunk[0], chunk.size());
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155 }
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156 }
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157
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158
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159 void ChunkedBuffer::AddChunk(const std::string::const_iterator& begin,
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160 const std::string::const_iterator& end)
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161 {
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162 const size_t s = end - begin;
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163
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164 if (s > 0)
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165 {
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166 AddChunk(&begin[0], s);
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167 }
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168 }
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169
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170
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171 void ChunkedBuffer::Flatten(std::string& result)
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172 {
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173 FlushPendingBuffer();
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174 result.resize(numBytes_);
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175
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176 size_t pos = 0;
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177 for (Chunks::iterator it = chunks_.begin();
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178 it != chunks_.end(); ++it)
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179 {
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180 assert(*it != NULL);
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181
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182 size_t s = (*it)->size();
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183 if (s != 0)
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184 {
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185 memcpy(&result[pos], (*it)->c_str(), s);
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186 pos += s;
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187 }
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188
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189 delete *it;
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190 }
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191
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192 chunks_.clear();
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193 numBytes_ = 0;
0
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194 }
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195 }