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annotate OrthancFramework/Sources/HttpServer/HttpStreamTranscoder.cpp @ 4544:ae63b301d522 Orthanc-1.7.4
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| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Tue, 02 Mar 2021 16:52:26 +0100 |
| parents | bf7b9edf6b81 |
| children | db3932f9660d |
| 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 |
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101 |
| 1525 | 102 HttpCompression HttpStreamTranscoder::SetupHttpCompression(bool gzipAllowed, |
| 103 bool deflateAllowed) | |
| 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 |
| 1525 | 112 switch (sourceCompression_) |
| 113 { | |
| 114 case CompressionType_None: | |
| 115 return HttpCompression_None; | |
| 116 | |
| 117 case CompressionType_ZlibWithSize: | |
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118 return SetupZlibCompression(deflateAllowed); |
| 1525 | 119 |
| 120 default: | |
| 121 throw OrthancException(ErrorCode_NotImplemented); | |
| 122 } | |
| 123 } | |
| 124 | |
| 125 | |
| 126 uint64_t HttpStreamTranscoder::GetContentLength() | |
| 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 |
| 1525 | 133 if (uncompressed_.get() != NULL) |
| 134 { | |
| 135 return uncompressed_->GetContentLength(); | |
| 136 } | |
| 137 else | |
| 138 { | |
| 139 uint64_t length = source_.GetContentLength(); | |
| 140 if (length < bytesToSkip_) | |
| 141 { | |
| 142 throw OrthancException(ErrorCode_InternalError); | |
| 143 } | |
| 144 | |
| 145 return length - bytesToSkip_; | |
| 146 } | |
| 147 } | |
| 148 | |
| 149 | |
| 150 bool HttpStreamTranscoder::ReadNextChunk() | |
| 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 |
| 1525 | 157 if (uncompressed_.get() != NULL) |
| 158 { | |
| 159 return uncompressed_->ReadNextChunk(); | |
| 160 } | |
| 161 | |
| 162 assert(skipped_ <= bytesToSkip_); | |
| 163 if (skipped_ == bytesToSkip_) | |
| 164 { | |
| 165 // We have already skipped the first bytes of the stream | |
| 166 currentChunkOffset_ = 0; | |
| 167 return source_.ReadNextChunk(); | |
| 168 } | |
| 169 | |
| 170 // This condition can only be true on the first call to "ReadNextChunk()" | |
| 171 for (;;) | |
| 172 { | |
| 173 assert(skipped_ < bytesToSkip_); | |
| 174 | |
| 175 bool ok = source_.ReadNextChunk(); | |
| 176 if (!ok) | |
| 177 { | |
| 178 throw OrthancException(ErrorCode_CorruptedFile); | |
| 179 } | |
| 180 | |
| 1545 | 181 size_t remaining = static_cast<size_t>(bytesToSkip_ - skipped_); |
| 1525 | 182 size_t s = source_.GetChunkSize(); |
| 183 | |
| 184 if (s < remaining) | |
| 185 { | |
| 186 skipped_ += s; | |
| 187 } | |
| 188 else if (s == remaining) | |
| 189 { | |
| 190 // We have skipped enough bytes, but we must read a new chunk | |
| 191 currentChunkOffset_ = 0; | |
| 192 skipped_ = bytesToSkip_; | |
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193 return source_.ReadNextChunk(); |
| 1525 | 194 } |
| 195 else | |
| 196 { | |
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197 // We have skipped enough bytes, and we have enough data in the current chunk |
| 1525 | 198 assert(s > remaining); |
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199 currentChunkOffset_ = remaining; |
| 1525 | 200 skipped_ = bytesToSkip_; |
| 201 return true; | |
| 202 } | |
| 203 } | |
| 204 } | |
| 205 | |
| 206 | |
| 207 const char* HttpStreamTranscoder::GetChunkContent() | |
| 208 { | |
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209 if (!ready_) |
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210 { |
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211 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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212 } |
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213 |
| 1525 | 214 if (uncompressed_.get() != NULL) |
| 215 { | |
| 216 return uncompressed_->GetChunkContent(); | |
| 217 } | |
| 218 else | |
| 219 { | |
| 220 return source_.GetChunkContent() + currentChunkOffset_; | |
| 221 } | |
| 222 } | |
| 223 | |
| 224 size_t HttpStreamTranscoder::GetChunkSize() | |
| 225 { | |
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226 if (!ready_) |
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227 { |
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228 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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229 } |
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230 |
| 1525 | 231 if (uncompressed_.get() != NULL) |
| 232 { | |
| 233 return uncompressed_->GetChunkSize(); | |
| 234 } | |
| 235 else | |
| 236 { | |
| 1545 | 237 return static_cast<size_t>(source_.GetChunkSize() - currentChunkOffset_); |
| 1525 | 238 } |
| 239 } | |
| 240 } |