Mercurial > hg > orthanc
annotate Core/HttpServer/HttpStreamTranscoder.cpp @ 2485:a5196a7d98c6
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| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Tue, 06 Mar 2018 10:41:05 +0100 |
| parents | 878b59270859 |
| children | 4e43e67f8ecf |
| 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) 2017-2018 Osimis S.A., Belgium |
| 1525 | 6 * |
| 7 * This program is free software: you can redistribute it and/or | |
| 8 * modify it under the terms of the GNU General Public License as | |
| 9 * published by the Free Software Foundation, either version 3 of the | |
| 10 * License, or (at your option) any later version. | |
| 11 * | |
| 12 * In addition, as a special exception, the copyright holders of this | |
| 13 * program give permission to link the code of its release with the | |
| 14 * OpenSSL project's "OpenSSL" library (or with modified versions of it | |
| 15 * that use the same license as the "OpenSSL" library), and distribute | |
| 16 * the linked executables. You must obey the GNU General Public License | |
| 17 * in all respects for all of the code used other than "OpenSSL". If you | |
| 18 * modify file(s) with this exception, you may extend this exception to | |
| 19 * your version of the file(s), but you are not obligated to do so. If | |
| 20 * you do not wish to do so, delete this exception statement from your | |
| 21 * version. If you delete this exception statement from all source files | |
| 22 * in the program, then also delete it here. | |
| 23 * | |
| 24 * This program is distributed in the hope that it will be useful, but | |
| 25 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 27 * General Public License for more details. | |
| 28 * | |
| 29 * You should have received a copy of the GNU General Public License | |
| 30 * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| 31 **/ | |
| 32 | |
| 33 | |
| 34 #include "../PrecompiledHeaders.h" | |
| 35 #include "HttpStreamTranscoder.h" | |
| 36 | |
| 37 #include "../OrthancException.h" | |
| 38 #include "../Compression/ZlibCompressor.h" | |
| 39 | |
| 40 #include <string.h> // For memcpy() | |
| 41 #include <cassert> | |
| 42 | |
|
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43 #include <stdio.h> |
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44 |
| 1525 | 45 namespace Orthanc |
| 46 { | |
| 47 void HttpStreamTranscoder::ReadSource(std::string& buffer) | |
| 48 { | |
| 49 if (source_.SetupHttpCompression(false, false) != HttpCompression_None) | |
| 50 { | |
| 51 throw OrthancException(ErrorCode_InternalError); | |
| 52 } | |
| 53 | |
| 54 uint64_t size = source_.GetContentLength(); | |
| 55 if (static_cast<uint64_t>(static_cast<size_t>(size)) != size) | |
| 56 { | |
| 57 throw OrthancException(ErrorCode_NotEnoughMemory); | |
| 58 } | |
| 59 | |
| 60 buffer.resize(static_cast<size_t>(size)); | |
| 61 size_t offset = 0; | |
| 62 | |
| 63 while (source_.ReadNextChunk()) | |
| 64 { | |
| 65 size_t chunkSize = static_cast<size_t>(source_.GetChunkSize()); | |
| 66 memcpy(&buffer[offset], source_.GetChunkContent(), chunkSize); | |
| 67 offset += chunkSize; | |
| 68 } | |
| 69 | |
| 70 if (offset != size) | |
| 71 { | |
| 72 throw OrthancException(ErrorCode_InternalError); | |
| 73 } | |
| 74 } | |
| 75 | |
| 76 | |
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77 HttpCompression HttpStreamTranscoder::SetupZlibCompression(bool deflateAllowed) |
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78 { |
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79 uint64_t size = source_.GetContentLength(); |
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80 |
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81 if (size == 0) |
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82 { |
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83 return HttpCompression_None; |
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84 } |
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85 |
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86 if (size < sizeof(uint64_t)) |
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87 { |
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88 throw OrthancException(ErrorCode_CorruptedFile); |
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89 } |
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90 |
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91 if (deflateAllowed) |
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92 { |
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93 bytesToSkip_ = sizeof(uint64_t); |
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94 |
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95 return HttpCompression_Deflate; |
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96 } |
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97 else |
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98 { |
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99 // TODO Use stream-based zlib decoding to reduce memory usage |
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100 std::string compressed; |
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101 ReadSource(compressed); |
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102 |
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103 uncompressed_.reset(new BufferHttpSender); |
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104 |
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105 ZlibCompressor compressor; |
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106 IBufferCompressor::Uncompress(uncompressed_->GetBuffer(), compressor, compressed); |
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107 |
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108 return HttpCompression_None; |
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109 } |
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110 } |
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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 | |
| 136 | |
| 137 uint64_t HttpStreamTranscoder::GetContentLength() | |
| 138 { | |
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139 if (!ready_) |
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140 { |
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141 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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142 } |
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143 |
| 1525 | 144 if (uncompressed_.get() != NULL) |
| 145 { | |
| 146 return uncompressed_->GetContentLength(); | |
| 147 } | |
| 148 else | |
| 149 { | |
| 150 uint64_t length = source_.GetContentLength(); | |
| 151 if (length < bytesToSkip_) | |
| 152 { | |
| 153 throw OrthancException(ErrorCode_InternalError); | |
| 154 } | |
| 155 | |
| 156 return length - bytesToSkip_; | |
| 157 } | |
| 158 } | |
| 159 | |
| 160 | |
| 161 bool HttpStreamTranscoder::ReadNextChunk() | |
| 162 { | |
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163 if (!ready_) |
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164 { |
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165 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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166 } |
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167 |
| 1525 | 168 if (uncompressed_.get() != NULL) |
| 169 { | |
| 170 return uncompressed_->ReadNextChunk(); | |
| 171 } | |
| 172 | |
| 173 assert(skipped_ <= bytesToSkip_); | |
| 174 if (skipped_ == bytesToSkip_) | |
| 175 { | |
| 176 // We have already skipped the first bytes of the stream | |
| 177 currentChunkOffset_ = 0; | |
| 178 return source_.ReadNextChunk(); | |
| 179 } | |
| 180 | |
| 181 // This condition can only be true on the first call to "ReadNextChunk()" | |
| 182 for (;;) | |
| 183 { | |
| 184 assert(skipped_ < bytesToSkip_); | |
| 185 | |
| 186 bool ok = source_.ReadNextChunk(); | |
| 187 if (!ok) | |
| 188 { | |
| 189 throw OrthancException(ErrorCode_CorruptedFile); | |
| 190 } | |
| 191 | |
| 1545 | 192 size_t remaining = static_cast<size_t>(bytesToSkip_ - skipped_); |
| 1525 | 193 size_t s = source_.GetChunkSize(); |
| 194 | |
| 195 if (s < remaining) | |
| 196 { | |
| 197 skipped_ += s; | |
| 198 } | |
| 199 else if (s == remaining) | |
| 200 { | |
| 201 // We have skipped enough bytes, but we must read a new chunk | |
| 202 currentChunkOffset_ = 0; | |
| 203 skipped_ = bytesToSkip_; | |
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204 return source_.ReadNextChunk(); |
| 1525 | 205 } |
| 206 else | |
| 207 { | |
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208 // We have skipped enough bytes, and we have enough data in the current chunk |
| 1525 | 209 assert(s > remaining); |
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210 currentChunkOffset_ = remaining; |
| 1525 | 211 skipped_ = bytesToSkip_; |
| 212 return true; | |
| 213 } | |
| 214 } | |
| 215 } | |
| 216 | |
| 217 | |
| 218 const char* HttpStreamTranscoder::GetChunkContent() | |
| 219 { | |
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220 if (!ready_) |
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221 { |
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222 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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223 } |
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224 |
| 1525 | 225 if (uncompressed_.get() != NULL) |
| 226 { | |
| 227 return uncompressed_->GetChunkContent(); | |
| 228 } | |
| 229 else | |
| 230 { | |
| 231 return source_.GetChunkContent() + currentChunkOffset_; | |
| 232 } | |
| 233 } | |
| 234 | |
| 235 size_t HttpStreamTranscoder::GetChunkSize() | |
| 236 { | |
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237 if (!ready_) |
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238 { |
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239 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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240 } |
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241 |
| 1525 | 242 if (uncompressed_.get() != NULL) |
| 243 { | |
| 244 return uncompressed_->GetChunkSize(); | |
| 245 } | |
| 246 else | |
| 247 { | |
| 1545 | 248 return static_cast<size_t>(source_.GetChunkSize() - currentChunkOffset_); |
| 1525 | 249 } |
| 250 } | |
| 251 } |