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annotate Core/HttpServer/HttpStreamTranscoder.cpp @ 2764:60f09c16c1e5 Orthanc-1.2.0
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| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Tue, 17 Jul 2018 09:42:14 +0200 |
| parents | b1291df2f780 |
| children | a3a65de1840f |
| 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 |
| 5 * | |
| 6 * This program is free software: you can redistribute it and/or | |
| 7 * modify it under the terms of the GNU General Public License as | |
| 8 * published by the Free Software Foundation, either version 3 of the | |
| 9 * License, or (at your option) any later version. | |
| 10 * | |
| 11 * In addition, as a special exception, the copyright holders of this | |
| 12 * program give permission to link the code of its release with the | |
| 13 * OpenSSL project's "OpenSSL" library (or with modified versions of it | |
| 14 * that use the same license as the "OpenSSL" library), and distribute | |
| 15 * the linked executables. You must obey the GNU General Public License | |
| 16 * in all respects for all of the code used other than "OpenSSL". If you | |
| 17 * modify file(s) with this exception, you may extend this exception to | |
| 18 * your version of the file(s), but you are not obligated to do so. If | |
| 19 * you do not wish to do so, delete this exception statement from your | |
| 20 * version. If you delete this exception statement from all source files | |
| 21 * in the program, then also delete it here. | |
| 22 * | |
| 23 * This program is distributed in the hope that it will be useful, but | |
| 24 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 26 * General Public License for more details. | |
| 27 * | |
| 28 * You should have received a copy of the GNU General Public License | |
| 29 * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| 30 **/ | |
| 31 | |
| 32 | |
| 33 #include "../PrecompiledHeaders.h" | |
| 34 #include "HttpStreamTranscoder.h" | |
| 35 | |
| 36 #include "../OrthancException.h" | |
| 37 #include "../Compression/ZlibCompressor.h" | |
| 38 | |
| 39 #include <string.h> // For memcpy() | |
| 40 #include <cassert> | |
| 41 | |
|
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42 #include <stdio.h> |
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43 |
| 1525 | 44 namespace Orthanc |
| 45 { | |
| 46 void HttpStreamTranscoder::ReadSource(std::string& buffer) | |
| 47 { | |
| 48 if (source_.SetupHttpCompression(false, false) != HttpCompression_None) | |
| 49 { | |
| 50 throw OrthancException(ErrorCode_InternalError); | |
| 51 } | |
| 52 | |
| 53 uint64_t size = source_.GetContentLength(); | |
| 54 if (static_cast<uint64_t>(static_cast<size_t>(size)) != size) | |
| 55 { | |
| 56 throw OrthancException(ErrorCode_NotEnoughMemory); | |
| 57 } | |
| 58 | |
| 59 buffer.resize(static_cast<size_t>(size)); | |
| 60 size_t offset = 0; | |
| 61 | |
| 62 while (source_.ReadNextChunk()) | |
| 63 { | |
| 64 size_t chunkSize = static_cast<size_t>(source_.GetChunkSize()); | |
| 65 memcpy(&buffer[offset], source_.GetChunkContent(), chunkSize); | |
| 66 offset += chunkSize; | |
| 67 } | |
| 68 | |
| 69 if (offset != size) | |
| 70 { | |
| 71 throw OrthancException(ErrorCode_InternalError); | |
| 72 } | |
| 73 } | |
| 74 | |
| 75 | |
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76 HttpCompression HttpStreamTranscoder::SetupZlibCompression(bool deflateAllowed) |
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77 { |
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78 uint64_t size = source_.GetContentLength(); |
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79 |
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80 if (size == 0) |
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81 { |
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82 return HttpCompression_None; |
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83 } |
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84 |
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85 if (size < sizeof(uint64_t)) |
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86 { |
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87 throw OrthancException(ErrorCode_CorruptedFile); |
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88 } |
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89 |
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90 if (deflateAllowed) |
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91 { |
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92 bytesToSkip_ = sizeof(uint64_t); |
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93 |
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94 return HttpCompression_Deflate; |
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95 } |
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96 else |
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97 { |
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98 // TODO Use stream-based zlib decoding to reduce memory usage |
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99 std::string compressed; |
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100 ReadSource(compressed); |
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101 |
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102 uncompressed_.reset(new BufferHttpSender); |
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103 |
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104 ZlibCompressor compressor; |
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105 IBufferCompressor::Uncompress(uncompressed_->GetBuffer(), compressor, compressed); |
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106 |
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107 return HttpCompression_None; |
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108 } |
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109 } |
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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 | |
| 135 | |
| 136 uint64_t HttpStreamTranscoder::GetContentLength() | |
| 137 { | |
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138 if (!ready_) |
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139 { |
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140 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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141 } |
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142 |
| 1525 | 143 if (uncompressed_.get() != NULL) |
| 144 { | |
| 145 return uncompressed_->GetContentLength(); | |
| 146 } | |
| 147 else | |
| 148 { | |
| 149 uint64_t length = source_.GetContentLength(); | |
| 150 if (length < bytesToSkip_) | |
| 151 { | |
| 152 throw OrthancException(ErrorCode_InternalError); | |
| 153 } | |
| 154 | |
| 155 return length - bytesToSkip_; | |
| 156 } | |
| 157 } | |
| 158 | |
| 159 | |
| 160 bool HttpStreamTranscoder::ReadNextChunk() | |
| 161 { | |
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162 if (!ready_) |
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163 { |
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164 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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165 } |
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166 |
| 1525 | 167 if (uncompressed_.get() != NULL) |
| 168 { | |
| 169 return uncompressed_->ReadNextChunk(); | |
| 170 } | |
| 171 | |
| 172 assert(skipped_ <= bytesToSkip_); | |
| 173 if (skipped_ == bytesToSkip_) | |
| 174 { | |
| 175 // We have already skipped the first bytes of the stream | |
| 176 currentChunkOffset_ = 0; | |
| 177 return source_.ReadNextChunk(); | |
| 178 } | |
| 179 | |
| 180 // This condition can only be true on the first call to "ReadNextChunk()" | |
| 181 for (;;) | |
| 182 { | |
| 183 assert(skipped_ < bytesToSkip_); | |
| 184 | |
| 185 bool ok = source_.ReadNextChunk(); | |
| 186 if (!ok) | |
| 187 { | |
| 188 throw OrthancException(ErrorCode_CorruptedFile); | |
| 189 } | |
| 190 | |
| 1545 | 191 size_t remaining = static_cast<size_t>(bytesToSkip_ - skipped_); |
| 1525 | 192 size_t s = source_.GetChunkSize(); |
| 193 | |
| 194 if (s < remaining) | |
| 195 { | |
| 196 skipped_ += s; | |
| 197 } | |
| 198 else if (s == remaining) | |
| 199 { | |
| 200 // We have skipped enough bytes, but we must read a new chunk | |
| 201 currentChunkOffset_ = 0; | |
| 202 skipped_ = bytesToSkip_; | |
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203 return source_.ReadNextChunk(); |
| 1525 | 204 } |
| 205 else | |
| 206 { | |
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207 // We have skipped enough bytes, and we have enough data in the current chunk |
| 1525 | 208 assert(s > remaining); |
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209 currentChunkOffset_ = remaining; |
| 1525 | 210 skipped_ = bytesToSkip_; |
| 211 return true; | |
| 212 } | |
| 213 } | |
| 214 } | |
| 215 | |
| 216 | |
| 217 const char* HttpStreamTranscoder::GetChunkContent() | |
| 218 { | |
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219 if (!ready_) |
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220 { |
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221 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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222 } |
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223 |
| 1525 | 224 if (uncompressed_.get() != NULL) |
| 225 { | |
| 226 return uncompressed_->GetChunkContent(); | |
| 227 } | |
| 228 else | |
| 229 { | |
| 230 return source_.GetChunkContent() + currentChunkOffset_; | |
| 231 } | |
| 232 } | |
| 233 | |
| 234 size_t HttpStreamTranscoder::GetChunkSize() | |
| 235 { | |
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236 if (!ready_) |
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237 { |
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238 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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239 } |
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240 |
| 1525 | 241 if (uncompressed_.get() != NULL) |
| 242 { | |
| 243 return uncompressed_->GetChunkSize(); | |
| 244 } | |
| 245 else | |
| 246 { | |
| 1545 | 247 return static_cast<size_t>(source_.GetChunkSize() - currentChunkOffset_); |
| 1525 | 248 } |
| 249 } | |
| 250 } |