Mercurial > hg > orthanc
annotate OrthancFramework/Sources/DicomFormat/StreamBlockReader.cpp @ 4696:dd6274412ff4
new configuration option "ExternalDictionaries" to load external DICOM dictionaries
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Thu, 17 Jun 2021 15:47:21 +0200 |
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1 /** |
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2 * Orthanc - A Lightweight, RESTful DICOM Store |
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics |
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4 * Department, University Hospital of Liege, Belgium |
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5 * Copyright (C) 2017-2021 Osimis S.A., Belgium |
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6 * |
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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. |
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11 * |
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12 * This program is distributed in the hope that it will be useful, but |
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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15 * Lesser General Public License for more details. |
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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/>. |
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20 **/ |
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21 |
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22 |
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23 #include "../PrecompiledHeaders.h" |
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24 #include "StreamBlockReader.h" |
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25 |
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26 #include "../OrthancException.h" |
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27 |
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28 |
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29 namespace Orthanc |
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30 { |
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31 StreamBlockReader::StreamBlockReader(std::istream& stream) : |
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32 stream_(stream), |
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33 blockPos_(0), |
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34 processedBytes_(0) |
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35 { |
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36 } |
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37 |
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38 |
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39 void StreamBlockReader::Schedule(size_t blockSize) |
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40 { |
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41 if (!block_.empty()) |
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42 { |
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43 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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44 } |
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45 else |
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46 { |
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47 block_.resize(blockSize); |
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48 blockPos_ = 0; |
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49 } |
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50 } |
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51 |
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52 |
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53 bool StreamBlockReader::Read(std::string& block) |
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54 { |
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55 if (block_.empty()) |
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56 { |
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57 if (blockPos_ != 0) |
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58 { |
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59 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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60 } |
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61 |
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62 block.clear(); |
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63 return true; |
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64 } |
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65 else |
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66 { |
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67 while (blockPos_ < block_.size()) |
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68 { |
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69 /** |
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70 * WARNING: Do NOT use "stream_.readsome()", as it does not |
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71 * work properly on non-buffered stream (which is the case in |
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72 * "DicomStreamReader::LookupPixelDataOffset()" for buffers) |
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73 **/ |
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74 |
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75 size_t remainingBytes = block_.size() - blockPos_; |
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76 stream_.read(&block_[blockPos_], remainingBytes); |
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77 |
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78 std::streamsize r = stream_.gcount(); |
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79 if (r == 0) |
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80 { |
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81 return false; |
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82 } |
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83 else |
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84 { |
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85 blockPos_ += r; |
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86 } |
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87 } |
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88 |
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89 processedBytes_ += block_.size(); |
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90 |
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91 block.swap(block_); |
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92 block_.clear(); |
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93 return true; |
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94 } |
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95 } |
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96 |
4297 | 97 uint64_t StreamBlockReader::GetProcessedBytes() const |
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98 { |
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99 return processedBytes_; |
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100 } |
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101 } |