Mercurial > hg > orthanc
annotate Core/HttpServer/HttpStreamTranscoder.cpp @ 1545:33d34bc4ac15
fix msvc warnings
| author | jodogne |
|---|---|
| date | Thu, 13 Aug 2015 21:02:31 +0200 |
| parents | 096a8af528c9 |
| children | e9325f3ac496 |
| rev | line source |
|---|---|
| 1525 | 1 /** |
| 2 * Orthanc - A Lightweight, RESTful DICOM Store | |
| 3 * Copyright (C) 2012-2015 Sebastien Jodogne, Medical Physics | |
| 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 | |
| 42 namespace Orthanc | |
| 43 { | |
| 44 void HttpStreamTranscoder::ReadSource(std::string& buffer) | |
| 45 { | |
| 46 if (source_.SetupHttpCompression(false, false) != HttpCompression_None) | |
| 47 { | |
| 48 throw OrthancException(ErrorCode_InternalError); | |
| 49 } | |
| 50 | |
| 51 uint64_t size = source_.GetContentLength(); | |
| 52 if (static_cast<uint64_t>(static_cast<size_t>(size)) != size) | |
| 53 { | |
| 54 throw OrthancException(ErrorCode_NotEnoughMemory); | |
| 55 } | |
| 56 | |
| 57 buffer.resize(static_cast<size_t>(size)); | |
| 58 size_t offset = 0; | |
| 59 | |
| 60 while (source_.ReadNextChunk()) | |
| 61 { | |
| 62 size_t chunkSize = static_cast<size_t>(source_.GetChunkSize()); | |
| 63 memcpy(&buffer[offset], source_.GetChunkContent(), chunkSize); | |
| 64 offset += chunkSize; | |
| 65 } | |
| 66 | |
| 67 if (offset != size) | |
| 68 { | |
| 69 throw OrthancException(ErrorCode_InternalError); | |
| 70 } | |
| 71 } | |
| 72 | |
| 73 | |
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74 HttpCompression HttpStreamTranscoder::SetupZlibCompression(bool deflateAllowed) |
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75 { |
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76 uint64_t size = source_.GetContentLength(); |
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77 |
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78 if (size == 0) |
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79 { |
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80 return HttpCompression_None; |
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81 } |
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82 |
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83 if (size < sizeof(uint64_t)) |
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84 { |
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85 throw OrthancException(ErrorCode_CorruptedFile); |
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86 } |
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87 |
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88 if (deflateAllowed) |
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89 { |
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90 bytesToSkip_ = sizeof(uint64_t); |
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91 |
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92 return HttpCompression_Deflate; |
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93 } |
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94 else |
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95 { |
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96 // TODO Use stream-based zlib decoding to reduce memory usage |
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97 std::string compressed; |
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98 ReadSource(compressed); |
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99 |
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100 uncompressed_.reset(new BufferHttpSender); |
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101 |
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102 ZlibCompressor compressor; |
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103 IBufferCompressor::Uncompress(uncompressed_->GetBuffer(), compressor, compressed); |
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104 |
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105 return HttpCompression_None; |
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106 } |
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107 } |
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108 |
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109 |
| 1525 | 110 HttpCompression HttpStreamTranscoder::SetupHttpCompression(bool gzipAllowed, |
| 111 bool deflateAllowed) | |
| 112 { | |
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113 if (ready_) |
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114 { |
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115 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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116 } |
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117 |
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118 ready_ = true; |
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119 |
| 1525 | 120 switch (sourceCompression_) |
| 121 { | |
| 122 case CompressionType_None: | |
| 123 return HttpCompression_None; | |
| 124 | |
| 125 case CompressionType_ZlibWithSize: | |
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126 return SetupZlibCompression(deflateAllowed); |
| 1525 | 127 |
| 128 default: | |
| 129 throw OrthancException(ErrorCode_NotImplemented); | |
| 130 } | |
| 131 } | |
| 132 | |
| 133 | |
| 134 uint64_t HttpStreamTranscoder::GetContentLength() | |
| 135 { | |
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136 if (!ready_) |
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137 { |
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138 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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139 } |
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140 |
| 1525 | 141 if (uncompressed_.get() != NULL) |
| 142 { | |
| 143 return uncompressed_->GetContentLength(); | |
| 144 } | |
| 145 else | |
| 146 { | |
| 147 uint64_t length = source_.GetContentLength(); | |
| 148 if (length < bytesToSkip_) | |
| 149 { | |
| 150 throw OrthancException(ErrorCode_InternalError); | |
| 151 } | |
| 152 | |
| 153 return length - bytesToSkip_; | |
| 154 } | |
| 155 } | |
| 156 | |
| 157 | |
| 158 bool HttpStreamTranscoder::ReadNextChunk() | |
| 159 { | |
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160 if (!ready_) |
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161 { |
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162 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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163 } |
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164 |
| 1525 | 165 if (uncompressed_.get() != NULL) |
| 166 { | |
| 167 return uncompressed_->ReadNextChunk(); | |
| 168 } | |
| 169 | |
| 170 assert(skipped_ <= bytesToSkip_); | |
| 171 if (skipped_ == bytesToSkip_) | |
| 172 { | |
| 173 // We have already skipped the first bytes of the stream | |
| 174 currentChunkOffset_ = 0; | |
| 175 return source_.ReadNextChunk(); | |
| 176 } | |
| 177 | |
| 178 // This condition can only be true on the first call to "ReadNextChunk()" | |
| 179 for (;;) | |
| 180 { | |
| 181 assert(skipped_ < bytesToSkip_); | |
| 182 | |
| 183 bool ok = source_.ReadNextChunk(); | |
| 184 if (!ok) | |
| 185 { | |
| 186 throw OrthancException(ErrorCode_CorruptedFile); | |
| 187 } | |
| 188 | |
| 1545 | 189 size_t remaining = static_cast<size_t>(bytesToSkip_ - skipped_); |
| 1525 | 190 size_t s = source_.GetChunkSize(); |
| 191 | |
| 192 if (s < remaining) | |
| 193 { | |
| 194 skipped_ += s; | |
| 195 } | |
| 196 else if (s == remaining) | |
| 197 { | |
| 198 // We have skipped enough bytes, but we must read a new chunk | |
| 199 currentChunkOffset_ = 0; | |
| 200 skipped_ = bytesToSkip_; | |
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201 return source_.ReadNextChunk(); |
| 1525 | 202 } |
| 203 else | |
| 204 { | |
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205 // We have skipped enough bytes, and we have enough data in the current chunk |
| 1525 | 206 assert(s > remaining); |
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207 currentChunkOffset_ = remaining; |
| 1525 | 208 skipped_ = bytesToSkip_; |
| 209 return true; | |
| 210 } | |
| 211 } | |
| 212 } | |
| 213 | |
| 214 | |
| 215 const char* HttpStreamTranscoder::GetChunkContent() | |
| 216 { | |
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217 if (!ready_) |
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218 { |
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219 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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220 } |
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221 |
| 1525 | 222 if (uncompressed_.get() != NULL) |
| 223 { | |
| 224 return uncompressed_->GetChunkContent(); | |
| 225 } | |
| 226 else | |
| 227 { | |
| 228 return source_.GetChunkContent() + currentChunkOffset_; | |
| 229 } | |
| 230 } | |
| 231 | |
| 232 size_t HttpStreamTranscoder::GetChunkSize() | |
| 233 { | |
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234 if (!ready_) |
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235 { |
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236 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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237 } |
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238 |
| 1525 | 239 if (uncompressed_.get() != NULL) |
| 240 { | |
| 241 return uncompressed_->GetChunkSize(); | |
| 242 } | |
| 243 else | |
| 244 { | |
| 1545 | 245 return static_cast<size_t>(source_.GetChunkSize() - currentChunkOffset_); |
| 1525 | 246 } |
| 247 } | |
| 248 } |