Mercurial > hg > orthanc
annotate OrthancFramework/Sources/HttpServer/HttpStreamTranscoder.cpp @ 4298:db3932f9660d
abi continued
| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Thu, 05 Nov 2020 18:21:03 +0100 |
| parents | bf7b9edf6b81 |
| children | d9473bd5ed43 |
| 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) 2017-2020 Osimis S.A., Belgium |
| 1525 | 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. |
| 1525 | 11 * |
| 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. |
| 1525 | 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/>. |
| 1525 | 20 **/ |
| 21 | |
| 22 | |
| 23 #include "../PrecompiledHeaders.h" | |
| 24 #include "HttpStreamTranscoder.h" | |
| 25 | |
| 26 #include "../OrthancException.h" | |
| 27 #include "../Compression/ZlibCompressor.h" | |
| 28 | |
| 29 #include <string.h> // For memcpy() | |
| 30 #include <cassert> | |
| 31 | |
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32 #include <stdio.h> |
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33 |
| 1525 | 34 namespace Orthanc |
| 35 { | |
| 36 void HttpStreamTranscoder::ReadSource(std::string& buffer) | |
| 37 { | |
| 38 if (source_.SetupHttpCompression(false, false) != HttpCompression_None) | |
| 39 { | |
| 40 throw OrthancException(ErrorCode_InternalError); | |
| 41 } | |
| 42 | |
| 43 uint64_t size = source_.GetContentLength(); | |
| 44 if (static_cast<uint64_t>(static_cast<size_t>(size)) != size) | |
| 45 { | |
| 46 throw OrthancException(ErrorCode_NotEnoughMemory); | |
| 47 } | |
| 48 | |
| 49 buffer.resize(static_cast<size_t>(size)); | |
| 50 size_t offset = 0; | |
| 51 | |
| 52 while (source_.ReadNextChunk()) | |
| 53 { | |
| 54 size_t chunkSize = static_cast<size_t>(source_.GetChunkSize()); | |
| 55 memcpy(&buffer[offset], source_.GetChunkContent(), chunkSize); | |
| 56 offset += chunkSize; | |
| 57 } | |
| 58 | |
| 59 if (offset != size) | |
| 60 { | |
| 61 throw OrthancException(ErrorCode_InternalError); | |
| 62 } | |
| 63 } | |
| 64 | |
| 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 |
| 4298 | 101 HttpStreamTranscoder::HttpStreamTranscoder(IHttpStreamAnswer &source, CompressionType compression) : |
| 102 source_(source), | |
| 103 sourceCompression_(compression), | |
| 104 bytesToSkip_(0), | |
| 105 skipped_(0), | |
| 106 currentChunkOffset_(0), | |
| 107 ready_(false) | |
| 108 { | |
| 109 } | |
| 110 | |
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111 |
| 1525 | 112 HttpCompression HttpStreamTranscoder::SetupHttpCompression(bool gzipAllowed, |
| 113 bool deflateAllowed) | |
| 114 { | |
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115 if (ready_) |
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116 { |
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117 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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118 } |
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119 |
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120 ready_ = true; |
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121 |
| 1525 | 122 switch (sourceCompression_) |
| 123 { | |
| 124 case CompressionType_None: | |
| 125 return HttpCompression_None; | |
| 126 | |
| 127 case CompressionType_ZlibWithSize: | |
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128 return SetupZlibCompression(deflateAllowed); |
| 1525 | 129 |
| 130 default: | |
| 131 throw OrthancException(ErrorCode_NotImplemented); | |
| 132 } | |
| 133 } | |
| 134 | |
| 4298 | 135 bool HttpStreamTranscoder::HasContentFilename(std::string &filename) |
| 136 { | |
| 137 return source_.HasContentFilename(filename); | |
| 138 } | |
| 139 | |
| 140 std::string HttpStreamTranscoder::GetContentType() | |
| 141 { | |
| 142 return source_.GetContentType(); | |
| 143 } | |
| 144 | |
| 1525 | 145 |
| 146 uint64_t HttpStreamTranscoder::GetContentLength() | |
| 147 { | |
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148 if (!ready_) |
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149 { |
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150 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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151 } |
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152 |
| 1525 | 153 if (uncompressed_.get() != NULL) |
| 154 { | |
| 155 return uncompressed_->GetContentLength(); | |
| 156 } | |
| 157 else | |
| 158 { | |
| 159 uint64_t length = source_.GetContentLength(); | |
| 160 if (length < bytesToSkip_) | |
| 161 { | |
| 162 throw OrthancException(ErrorCode_InternalError); | |
| 163 } | |
| 164 | |
| 165 return length - bytesToSkip_; | |
| 166 } | |
| 167 } | |
| 168 | |
| 169 | |
| 170 bool HttpStreamTranscoder::ReadNextChunk() | |
| 171 { | |
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172 if (!ready_) |
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173 { |
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174 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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175 } |
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176 |
| 1525 | 177 if (uncompressed_.get() != NULL) |
| 178 { | |
| 179 return uncompressed_->ReadNextChunk(); | |
| 180 } | |
| 181 | |
| 182 assert(skipped_ <= bytesToSkip_); | |
| 183 if (skipped_ == bytesToSkip_) | |
| 184 { | |
| 185 // We have already skipped the first bytes of the stream | |
| 186 currentChunkOffset_ = 0; | |
| 187 return source_.ReadNextChunk(); | |
| 188 } | |
| 189 | |
| 190 // This condition can only be true on the first call to "ReadNextChunk()" | |
| 191 for (;;) | |
| 192 { | |
| 193 assert(skipped_ < bytesToSkip_); | |
| 194 | |
| 195 bool ok = source_.ReadNextChunk(); | |
| 196 if (!ok) | |
| 197 { | |
| 198 throw OrthancException(ErrorCode_CorruptedFile); | |
| 199 } | |
| 200 | |
| 1545 | 201 size_t remaining = static_cast<size_t>(bytesToSkip_ - skipped_); |
| 1525 | 202 size_t s = source_.GetChunkSize(); |
| 203 | |
| 204 if (s < remaining) | |
| 205 { | |
| 206 skipped_ += s; | |
| 207 } | |
| 208 else if (s == remaining) | |
| 209 { | |
| 210 // We have skipped enough bytes, but we must read a new chunk | |
| 211 currentChunkOffset_ = 0; | |
| 212 skipped_ = bytesToSkip_; | |
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213 return source_.ReadNextChunk(); |
| 1525 | 214 } |
| 215 else | |
| 216 { | |
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217 // We have skipped enough bytes, and we have enough data in the current chunk |
| 1525 | 218 assert(s > remaining); |
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219 currentChunkOffset_ = remaining; |
| 1525 | 220 skipped_ = bytesToSkip_; |
| 221 return true; | |
| 222 } | |
| 223 } | |
| 224 } | |
| 225 | |
| 226 | |
| 227 const char* HttpStreamTranscoder::GetChunkContent() | |
| 228 { | |
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229 if (!ready_) |
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230 { |
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231 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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232 } |
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233 |
| 1525 | 234 if (uncompressed_.get() != NULL) |
| 235 { | |
| 236 return uncompressed_->GetChunkContent(); | |
| 237 } | |
| 238 else | |
| 239 { | |
| 240 return source_.GetChunkContent() + currentChunkOffset_; | |
| 241 } | |
| 242 } | |
| 243 | |
| 244 size_t HttpStreamTranscoder::GetChunkSize() | |
| 245 { | |
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246 if (!ready_) |
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247 { |
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248 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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249 } |
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|
250 |
| 1525 | 251 if (uncompressed_.get() != NULL) |
| 252 { | |
| 253 return uncompressed_->GetChunkSize(); | |
| 254 } | |
| 255 else | |
| 256 { | |
| 1545 | 257 return static_cast<size_t>(source_.GetChunkSize() - currentChunkOffset_); |
| 1525 | 258 } |
| 259 } | |
| 260 } |