annotate OrthancFramework/Sources/HttpServer/HttpStreamTranscoder.cpp @ 4544:ae63b301d522 Orthanc-1.7.4

close branch
author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 02 Mar 2021 16:52:26 +0100
parents bf7b9edf6b81
children db3932f9660d
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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) 2017-2020 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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21
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22
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23 #include "../PrecompiledHeaders.h"
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24 #include "HttpStreamTranscoder.h"
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25
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26 #include "../OrthancException.h"
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27 #include "../Compression/ZlibCompressor.h"
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28
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29 #include <string.h> // For memcpy()
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30 #include <cassert>
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31
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32 #include <stdio.h>
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33
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34 namespace Orthanc
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35 {
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36 void HttpStreamTranscoder::ReadSource(std::string& buffer)
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37 {
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38 if (source_.SetupHttpCompression(false, false) != HttpCompression_None)
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39 {
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40 throw OrthancException(ErrorCode_InternalError);
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41 }
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42
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43 uint64_t size = source_.GetContentLength();
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44 if (static_cast<uint64_t>(static_cast<size_t>(size)) != size)
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45 {
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46 throw OrthancException(ErrorCode_NotEnoughMemory);
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47 }
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48
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49 buffer.resize(static_cast<size_t>(size));
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50 size_t offset = 0;
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51
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52 while (source_.ReadNextChunk())
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53 {
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54 size_t chunkSize = static_cast<size_t>(source_.GetChunkSize());
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55 memcpy(&buffer[offset], source_.GetChunkContent(), chunkSize);
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56 offset += chunkSize;
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57 }
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58
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59 if (offset != size)
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60 {
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61 throw OrthancException(ErrorCode_InternalError);
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62 }
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63 }
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64
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65
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66 HttpCompression HttpStreamTranscoder::SetupZlibCompression(bool deflateAllowed)
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67 {
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68 uint64_t size = source_.GetContentLength();
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69
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70 if (size == 0)
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71 {
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72 return HttpCompression_None;
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73 }
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74
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75 if (size < sizeof(uint64_t))
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76 {
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77 throw OrthancException(ErrorCode_CorruptedFile);
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78 }
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79
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80 if (deflateAllowed)
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81 {
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82 bytesToSkip_ = sizeof(uint64_t);
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83
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84 return HttpCompression_Deflate;
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85 }
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86 else
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87 {
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88 // TODO Use stream-based zlib decoding to reduce memory usage
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89 std::string compressed;
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90 ReadSource(compressed);
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91
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92 uncompressed_.reset(new BufferHttpSender);
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93
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94 ZlibCompressor compressor;
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95 IBufferCompressor::Uncompress(uncompressed_->GetBuffer(), compressor, compressed);
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96
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97 return HttpCompression_None;
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98 }
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99 }
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100
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101
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102 HttpCompression HttpStreamTranscoder::SetupHttpCompression(bool gzipAllowed,
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103 bool deflateAllowed)
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104 {
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105 if (ready_)
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106 {
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107 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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108 }
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109
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110 ready_ = true;
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111
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112 switch (sourceCompression_)
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113 {
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114 case CompressionType_None:
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115 return HttpCompression_None;
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116
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117 case CompressionType_ZlibWithSize:
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118 return SetupZlibCompression(deflateAllowed);
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119
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120 default:
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121 throw OrthancException(ErrorCode_NotImplemented);
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122 }
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123 }
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124
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125
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126 uint64_t HttpStreamTranscoder::GetContentLength()
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127 {
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128 if (!ready_)
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129 {
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130 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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131 }
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132
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133 if (uncompressed_.get() != NULL)
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134 {
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135 return uncompressed_->GetContentLength();
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136 }
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137 else
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138 {
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139 uint64_t length = source_.GetContentLength();
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140 if (length < bytesToSkip_)
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parents:
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141 {
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142 throw OrthancException(ErrorCode_InternalError);
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143 }
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parents:
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144
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diff changeset
145 return length - bytesToSkip_;
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parents:
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146 }
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147 }
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parents:
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148
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parents:
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149
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150 bool HttpStreamTranscoder::ReadNextChunk()
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151 {
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152 if (!ready_)
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153 {
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154 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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155 }
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156
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157 if (uncompressed_.get() != NULL)
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158 {
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159 return uncompressed_->ReadNextChunk();
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160 }
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parents:
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161
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diff changeset
162 assert(skipped_ <= bytesToSkip_);
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163 if (skipped_ == bytesToSkip_)
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parents:
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164 {
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165 // We have already skipped the first bytes of the stream
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166 currentChunkOffset_ = 0;
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167 return source_.ReadNextChunk();
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168 }
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169
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170 // This condition can only be true on the first call to "ReadNextChunk()"
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171 for (;;)
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172 {
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173 assert(skipped_ < bytesToSkip_);
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parents:
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174
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175 bool ok = source_.ReadNextChunk();
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176 if (!ok)
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177 {
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178 throw OrthancException(ErrorCode_CorruptedFile);
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179 }
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180
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181 size_t remaining = static_cast<size_t>(bytesToSkip_ - skipped_);
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182 size_t s = source_.GetChunkSize();
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parents:
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183
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diff changeset
184 if (s < remaining)
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parents:
diff changeset
185 {
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diff changeset
186 skipped_ += s;
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parents:
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187 }
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diff changeset
188 else if (s == remaining)
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parents:
diff changeset
189 {
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190 // We have skipped enough bytes, but we must read a new chunk
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191 currentChunkOffset_ = 0;
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diff changeset
192 skipped_ = bytesToSkip_;
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193 return source_.ReadNextChunk();
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194 }
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
195 else
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parents:
diff changeset
196 {
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197 // We have skipped enough bytes, and we have enough data in the current chunk
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198 assert(s > remaining);
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199 currentChunkOffset_ = remaining;
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diff changeset
200 skipped_ = bytesToSkip_;
f9b0169eb6bb testing
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diff changeset
201 return true;
f9b0169eb6bb testing
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parents:
diff changeset
202 }
f9b0169eb6bb testing
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
203 }
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
204 }
f9b0169eb6bb testing
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
205
f9b0169eb6bb testing
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
206
f9b0169eb6bb testing
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
207 const char* HttpStreamTranscoder::GetChunkContent()
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
208 {
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209 if (!ready_)
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diff changeset
210 {
096a8af528c9 fix streams, initialization/finalization of libcurl and openssl
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211 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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212 }
096a8af528c9 fix streams, initialization/finalization of libcurl and openssl
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diff changeset
213
1525
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diff changeset
214 if (uncompressed_.get() != NULL)
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
215 {
f9b0169eb6bb testing
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parents:
diff changeset
216 return uncompressed_->GetChunkContent();
f9b0169eb6bb testing
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parents:
diff changeset
217 }
f9b0169eb6bb testing
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
218 else
f9b0169eb6bb testing
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
219 {
f9b0169eb6bb testing
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parents:
diff changeset
220 return source_.GetChunkContent() + currentChunkOffset_;
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parents:
diff changeset
221 }
f9b0169eb6bb testing
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
222 }
f9b0169eb6bb testing
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
223
f9b0169eb6bb testing
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
224 size_t HttpStreamTranscoder::GetChunkSize()
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parents:
diff changeset
225 {
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diff changeset
226 if (!ready_)
096a8af528c9 fix streams, initialization/finalization of libcurl and openssl
Sebastien Jodogne <s.jodogne@gmail.com>
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diff changeset
227 {
096a8af528c9 fix streams, initialization/finalization of libcurl and openssl
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228 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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229 }
096a8af528c9 fix streams, initialization/finalization of libcurl and openssl
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diff changeset
230
1525
f9b0169eb6bb testing
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parents:
diff changeset
231 if (uncompressed_.get() != NULL)
f9b0169eb6bb testing
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parents:
diff changeset
232 {
f9b0169eb6bb testing
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parents:
diff changeset
233 return uncompressed_->GetChunkSize();
f9b0169eb6bb testing
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parents:
diff changeset
234 }
f9b0169eb6bb testing
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
235 else
f9b0169eb6bb testing
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parents:
diff changeset
236 {
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237 return static_cast<size_t>(source_.GetChunkSize() - currentChunkOffset_);
1525
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parents:
diff changeset
238 }
f9b0169eb6bb testing
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parents:
diff changeset
239 }
f9b0169eb6bb testing
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
240 }