Mercurial > hg > orthanc
annotate Core/HttpServer/HttpStreamTranscoder.cpp @ 1728:4941494b5dd8 db-changes
rename LookupIdentifier as LookupIdentifierExact
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Tue, 20 Oct 2015 15:03:52 +0200 |
parents | e9325f3ac496 |
children | b1291df2f780 |
rev | line source |
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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 | |
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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 } |