Mercurial > hg > orthanc
annotate OrthancFramework/Sources/HttpServer/HttpStreamTranscoder.cpp @ 4844:55e8fb8e8028
tagging a pre-release of the Orthanc framework for WSI 1.1
| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Tue, 07 Dec 2021 14:01:17 +0100 |
| parents | 7053502fbf97 |
| children | 43e613a7756b |
| rev | line source |
|---|---|
| 1525 | 1 /** |
| 2 * Orthanc - A Lightweight, RESTful DICOM Store | |
| 1900 | 3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics |
| 1525 | 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 * Copyright (C) 2021-2021 Sebastien Jodogne, ICTEAM UCLouvain, Belgium |
| 1525 | 7 * |
| 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. |
| 1525 | 12 * |
| 13 * This program is distributed in the hope that it will be useful, but | |
| 14 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
|
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16 * Lesser General Public License for more details. |
| 1525 | 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/>. |
| 1525 | 21 **/ |
| 22 | |
| 23 | |
| 24 #include "../PrecompiledHeaders.h" | |
| 25 #include "HttpStreamTranscoder.h" | |
| 26 | |
| 27 #include "../OrthancException.h" | |
| 28 #include "../Compression/ZlibCompressor.h" | |
| 29 | |
| 30 #include <string.h> // For memcpy() | |
| 31 #include <cassert> | |
| 32 | |
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33 #include <stdio.h> |
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34 |
| 1525 | 35 namespace Orthanc |
| 36 { | |
| 37 void HttpStreamTranscoder::ReadSource(std::string& buffer) | |
| 38 { | |
| 39 if (source_.SetupHttpCompression(false, false) != HttpCompression_None) | |
| 40 { | |
| 41 throw OrthancException(ErrorCode_InternalError); | |
| 42 } | |
| 43 | |
| 44 uint64_t size = source_.GetContentLength(); | |
| 45 if (static_cast<uint64_t>(static_cast<size_t>(size)) != size) | |
| 46 { | |
| 47 throw OrthancException(ErrorCode_NotEnoughMemory); | |
| 48 } | |
| 49 | |
| 50 buffer.resize(static_cast<size_t>(size)); | |
| 51 size_t offset = 0; | |
| 52 | |
| 53 while (source_.ReadNextChunk()) | |
| 54 { | |
| 55 size_t chunkSize = static_cast<size_t>(source_.GetChunkSize()); | |
| 56 memcpy(&buffer[offset], source_.GetChunkContent(), chunkSize); | |
| 57 offset += chunkSize; | |
| 58 } | |
| 59 | |
| 60 if (offset != size) | |
| 61 { | |
| 62 throw OrthancException(ErrorCode_InternalError); | |
| 63 } | |
| 64 } | |
| 65 | |
| 66 | |
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67 HttpCompression HttpStreamTranscoder::SetupZlibCompression(bool deflateAllowed) |
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68 { |
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69 uint64_t size = source_.GetContentLength(); |
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70 |
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71 if (size == 0) |
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72 { |
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73 return HttpCompression_None; |
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74 } |
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75 |
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76 if (size < sizeof(uint64_t)) |
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77 { |
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78 throw OrthancException(ErrorCode_CorruptedFile); |
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79 } |
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80 |
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81 if (deflateAllowed) |
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82 { |
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83 bytesToSkip_ = sizeof(uint64_t); |
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84 |
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85 return HttpCompression_Deflate; |
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86 } |
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87 else |
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88 { |
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89 // TODO Use stream-based zlib decoding to reduce memory usage |
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90 std::string compressed; |
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91 ReadSource(compressed); |
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92 |
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93 uncompressed_.reset(new BufferHttpSender); |
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94 |
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95 ZlibCompressor compressor; |
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96 IBufferCompressor::Uncompress(uncompressed_->GetBuffer(), compressor, compressed); |
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97 |
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98 return HttpCompression_None; |
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99 } |
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100 } |
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101 |
| 4298 | 102 HttpStreamTranscoder::HttpStreamTranscoder(IHttpStreamAnswer &source, CompressionType compression) : |
| 103 source_(source), | |
| 104 sourceCompression_(compression), | |
| 105 bytesToSkip_(0), | |
| 106 skipped_(0), | |
| 107 currentChunkOffset_(0), | |
| 108 ready_(false) | |
| 109 { | |
| 110 } | |
| 111 | |
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112 |
| 1525 | 113 HttpCompression HttpStreamTranscoder::SetupHttpCompression(bool gzipAllowed, |
| 114 bool deflateAllowed) | |
| 115 { | |
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116 if (ready_) |
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117 { |
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118 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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119 } |
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120 |
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121 ready_ = true; |
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122 |
| 1525 | 123 switch (sourceCompression_) |
| 124 { | |
| 125 case CompressionType_None: | |
| 126 return HttpCompression_None; | |
| 127 | |
| 128 case CompressionType_ZlibWithSize: | |
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129 return SetupZlibCompression(deflateAllowed); |
| 1525 | 130 |
| 131 default: | |
| 132 throw OrthancException(ErrorCode_NotImplemented); | |
| 133 } | |
| 134 } | |
| 135 | |
| 4298 | 136 bool HttpStreamTranscoder::HasContentFilename(std::string &filename) |
| 137 { | |
| 138 return source_.HasContentFilename(filename); | |
| 139 } | |
| 140 | |
| 141 std::string HttpStreamTranscoder::GetContentType() | |
| 142 { | |
| 143 return source_.GetContentType(); | |
| 144 } | |
| 145 | |
| 1525 | 146 |
| 147 uint64_t HttpStreamTranscoder::GetContentLength() | |
| 148 { | |
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149 if (!ready_) |
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150 { |
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151 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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152 } |
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153 |
| 1525 | 154 if (uncompressed_.get() != NULL) |
| 155 { | |
| 156 return uncompressed_->GetContentLength(); | |
| 157 } | |
| 158 else | |
| 159 { | |
| 160 uint64_t length = source_.GetContentLength(); | |
| 161 if (length < bytesToSkip_) | |
| 162 { | |
| 163 throw OrthancException(ErrorCode_InternalError); | |
| 164 } | |
| 165 | |
| 166 return length - bytesToSkip_; | |
| 167 } | |
| 168 } | |
| 169 | |
| 170 | |
| 171 bool HttpStreamTranscoder::ReadNextChunk() | |
| 172 { | |
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173 if (!ready_) |
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174 { |
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175 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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176 } |
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177 |
| 1525 | 178 if (uncompressed_.get() != NULL) |
| 179 { | |
| 180 return uncompressed_->ReadNextChunk(); | |
| 181 } | |
| 182 | |
| 183 assert(skipped_ <= bytesToSkip_); | |
| 184 if (skipped_ == bytesToSkip_) | |
| 185 { | |
| 186 // We have already skipped the first bytes of the stream | |
| 187 currentChunkOffset_ = 0; | |
| 188 return source_.ReadNextChunk(); | |
| 189 } | |
| 190 | |
| 191 // This condition can only be true on the first call to "ReadNextChunk()" | |
| 192 for (;;) | |
| 193 { | |
| 194 assert(skipped_ < bytesToSkip_); | |
| 195 | |
| 196 bool ok = source_.ReadNextChunk(); | |
| 197 if (!ok) | |
| 198 { | |
| 199 throw OrthancException(ErrorCode_CorruptedFile); | |
| 200 } | |
| 201 | |
| 1545 | 202 size_t remaining = static_cast<size_t>(bytesToSkip_ - skipped_); |
| 1525 | 203 size_t s = source_.GetChunkSize(); |
| 204 | |
| 205 if (s < remaining) | |
| 206 { | |
| 207 skipped_ += s; | |
| 208 } | |
| 209 else if (s == remaining) | |
| 210 { | |
| 211 // We have skipped enough bytes, but we must read a new chunk | |
| 212 currentChunkOffset_ = 0; | |
| 213 skipped_ = bytesToSkip_; | |
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214 return source_.ReadNextChunk(); |
| 1525 | 215 } |
| 216 else | |
| 217 { | |
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218 // We have skipped enough bytes, and we have enough data in the current chunk |
| 1525 | 219 assert(s > remaining); |
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220 currentChunkOffset_ = remaining; |
| 1525 | 221 skipped_ = bytesToSkip_; |
| 222 return true; | |
| 223 } | |
| 224 } | |
| 225 } | |
| 226 | |
| 227 | |
| 228 const char* HttpStreamTranscoder::GetChunkContent() | |
| 229 { | |
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230 if (!ready_) |
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231 { |
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232 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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233 } |
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234 |
| 1525 | 235 if (uncompressed_.get() != NULL) |
| 236 { | |
| 237 return uncompressed_->GetChunkContent(); | |
| 238 } | |
| 239 else | |
| 240 { | |
| 241 return source_.GetChunkContent() + currentChunkOffset_; | |
| 242 } | |
| 243 } | |
| 244 | |
| 245 size_t HttpStreamTranscoder::GetChunkSize() | |
| 246 { | |
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247 if (!ready_) |
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248 { |
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249 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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096a8af528c9
fix streams, initialization/finalization of libcurl and openssl
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
1525
diff
changeset
|
250 } |
|
096a8af528c9
fix streams, initialization/finalization of libcurl and openssl
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
1525
diff
changeset
|
251 |
| 1525 | 252 if (uncompressed_.get() != NULL) |
| 253 { | |
| 254 return uncompressed_->GetChunkSize(); | |
| 255 } | |
| 256 else | |
| 257 { | |
| 1545 | 258 return static_cast<size_t>(source_.GetChunkSize() - currentChunkOffset_); |
| 1525 | 259 } |
| 260 } | |
| 261 } |