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annotate OrthancFramework/Sources/DicomFormat/StreamBlockReader.cpp @ 4694:da1edb7d6332

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"/tools/bulk-delete" to delete a group of multiple, unrelated resources at once
author Sebastien Jodogne <s.jodogne@gmail.com>
date Wed, 16 Jun 2021 17:37:47 +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
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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 }