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annotate OrthancFramework/Sources/ChunkedBuffer.cpp @ 5649:4a2bfda999c6

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author Alain Mazy <am@orthanc.team>
date Mon, 03 Jun 2024 14:30:30 +0200
parents f7adfb22e20e
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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) 2024-2024 Orthanc Team SRL, Belgium
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7 * Copyright (C) 2021-2024 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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8 *
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9 * This program is free software: you can redistribute it and/or
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10 * modify it under the terms of the GNU Lesser General Public License
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11 * as published by the Free Software Foundation, either version 3 of
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12 * the License, or (at your option) any later version.
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13 *
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14 * This program is distributed in the hope that it will be useful, but
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15 * WITHOUT ANY WARRANTY; without even the implied warranty of
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16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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17 * Lesser General Public License for more details.
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18 *
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19 * You should have received a copy of the GNU Lesser General Public
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20 * License along with this program. If not, see
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21 * <http://www.gnu.org/licenses/>.
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22 **/
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24
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25 #include "PrecompiledHeaders.h"
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26 #include "ChunkedBuffer.h"
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28 #include <cassert>
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29 #include <string.h>
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31
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32 namespace Orthanc
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33 {
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34 void ChunkedBuffer::Clear()
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35 {
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36 numBytes_ = 0;
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37 pendingPos_ = 0;
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39 for (Chunks::iterator it = chunks_.begin();
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40 it != chunks_.end(); ++it)
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41 {
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42 delete *it;
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43 }
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44 }
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46
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47 void ChunkedBuffer::AddChunkInternal(const void* chunkData,
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48 size_t chunkSize)
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49 {
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50 if (chunkSize == 0)
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51 {
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52 return;
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53 }
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54 else
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55 {
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56 assert(chunkData != NULL);
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57 chunks_.push_back(new std::string(reinterpret_cast<const char*>(chunkData), chunkSize));
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58 numBytes_ += chunkSize;
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59 }
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60 }
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63 void ChunkedBuffer::FlushPendingBuffer()
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64 {
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65 assert(pendingPos_ <= pendingBuffer_.size());
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67 if (!pendingBuffer_.empty())
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68 {
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69 AddChunkInternal(pendingBuffer_.c_str(), pendingPos_);
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70 }
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71 else
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72 {
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73 assert(pendingPos_ == 0);
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74 }
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76 pendingPos_ = 0;
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77 }
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80 ChunkedBuffer::ChunkedBuffer() :
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81 numBytes_(0),
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82 pendingPos_(0)
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83 {
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84 pendingBuffer_.resize(16 * 1024); // Default size of the pending buffer: 16KB
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85 }
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88 ChunkedBuffer::~ChunkedBuffer()
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89 {
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90 Clear();
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91 }
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94 size_t ChunkedBuffer::GetNumBytes() const
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95 {
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96 return numBytes_ + pendingPos_;
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97 }
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99
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100 void ChunkedBuffer::SetPendingBufferSize(size_t size)
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101 {
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102 FlushPendingBuffer();
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103 pendingBuffer_.resize(size);
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104 }
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106
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107 size_t ChunkedBuffer::GetPendingBufferSize() const
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108 {
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109 return pendingBuffer_.size();
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110 }
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111
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112
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113 void ChunkedBuffer::AddChunk(const void* chunkData,
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114 size_t chunkSize)
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115 {
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116 if (chunkSize > 0)
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117 {
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118 #if 1
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119 assert(sizeof(char) == 1);
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120
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121 // Optimization if Orthanc >= 1.7.3, to speed up in the presence of many small chunks
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122 if (pendingPos_ + chunkSize <= pendingBuffer_.size())
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123 {
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124 // There remains enough place in the pending buffer
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125 memcpy(&pendingBuffer_[pendingPos_], chunkData, chunkSize);
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126 pendingPos_ += chunkSize;
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127 }
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128 else
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129 {
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130 FlushPendingBuffer();
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131
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132 if (!pendingBuffer_.empty() &&
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133 chunkSize < pendingBuffer_.size())
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134 {
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135 memcpy(&pendingBuffer_[0], chunkData, chunkSize);
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136 pendingPos_ = chunkSize;
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137 }
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138 else
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139 {
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140 AddChunkInternal(chunkData, chunkSize);
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141 }
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142 }
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143 #else
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144 // Non-optimized implementation in Orthanc <= 1.7.2
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145 AddChunkInternal(chunkData, chunkSize);
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146 #endif
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147 }
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148 }
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149
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150
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151 void ChunkedBuffer::AddChunk(const std::string& chunk)
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152 {
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153 if (chunk.size() > 0)
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154 {
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155 AddChunk(&chunk[0], chunk.size());
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156 }
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157 }
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158
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159
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160 void ChunkedBuffer::AddChunk(const std::string::const_iterator& begin,
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161 const std::string::const_iterator& end)
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162 {
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163 const size_t s = end - begin;
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164
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165 if (s > 0)
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166 {
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167 AddChunk(&begin[0], s);
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168 }
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169 }
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170
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171
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172 void ChunkedBuffer::Flatten(std::string& result)
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173 {
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174 FlushPendingBuffer();
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175 result.resize(numBytes_);
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176
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177 size_t pos = 0;
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178 for (Chunks::iterator it = chunks_.begin();
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179 it != chunks_.end(); ++it)
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180 {
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181 assert(*it != NULL);
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182
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183 size_t s = (*it)->size();
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184 if (s != 0)
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185 {
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186 memcpy(&result[pos], (*it)->c_str(), s);
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187 pos += s;
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188 }
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189
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190 delete *it;
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191 }
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192
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193 chunks_.clear();
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194 numBytes_ = 0;
0
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195 }
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196 }