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annotate OrthancFramework/Sources/DicomFormat/StreamBlockReader.cpp @ 5853:4d932683049d get-scu tip

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very first implementation of C-Get SCU
author Alain Mazy <am@orthanc.team>
date Tue, 29 Oct 2024 17:25:49 +0100
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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) 2017-2023 Osimis S.A., Belgium
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6 * Copyright (C) 2024-2024 Orthanc Team SRL, Belgium
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7 * Copyright (C) 2021-2024 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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8 *
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9 * This program is free software: you can redistribute it and/or
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10 * modify it under the terms of the GNU Lesser General Public License
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11 * as published by the Free Software Foundation, either version 3 of
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12 * the License, or (at your option) any later version.
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13 *
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14 * This program is distributed in the hope that it will be useful, but
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15 * WITHOUT ANY WARRANTY; without even the implied warranty of
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16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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17 * Lesser General Public License for more details.
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18 *
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19 * You should have received a copy of the GNU Lesser General Public
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20 * License along with this program. If not, see
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21 * <http://www.gnu.org/licenses/>.
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22 **/
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24
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25 #include "../PrecompiledHeaders.h"
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26 #include "StreamBlockReader.h"
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27
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28 #include "../OrthancException.h"
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29
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30
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31 namespace Orthanc
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32 {
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33 StreamBlockReader::StreamBlockReader(std::istream& stream) :
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34 stream_(stream),
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35 blockPos_(0),
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36 processedBytes_(0)
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37 {
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38 }
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39
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40
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41 void StreamBlockReader::Schedule(size_t blockSize)
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42 {
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43 if (!block_.empty())
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44 {
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45 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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46 }
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47 else
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48 {
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49 block_.resize(blockSize);
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50 blockPos_ = 0;
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51 }
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52 }
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53
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54
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55 bool StreamBlockReader::Read(std::string& block)
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56 {
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57 if (block_.empty())
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58 {
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59 if (blockPos_ != 0)
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60 {
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61 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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62 }
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63
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64 block.clear();
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65 return true;
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66 }
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67 else
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68 {
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69 while (blockPos_ < block_.size())
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70 {
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71 /**
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72 * WARNING: Do NOT use "stream_.readsome()", as it does not
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73 * work properly on non-buffered stream (which is the case in
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74 * "DicomStreamReader::LookupPixelDataOffset()" for buffers)
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75 **/
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76
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77 size_t remainingBytes = block_.size() - blockPos_;
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78 stream_.read(&block_[blockPos_], remainingBytes);
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79
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80 std::streamsize r = stream_.gcount();
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81 if (r == 0)
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82 {
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83 return false;
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84 }
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85 else
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86 {
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87 blockPos_ += r;
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88 }
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89 }
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90
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91 processedBytes_ += block_.size();
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92
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93 block.swap(block_);
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94 block_.clear();
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95 return true;
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96 }
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97 }
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98
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99 uint64_t StreamBlockReader::GetProcessedBytes() const
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100 {
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101 return processedBytes_;
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102 }
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103 }