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annotate OrthancFramework/Sources/DicomFormat/StreamBlockReader.cpp @ 4297:785a2713323e

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abi continued
author Sebastien Jodogne <s.jodogne@gmail.com>
date Thu, 05 Nov 2020 17:20:49 +0100
parents 3b70a2e6a06c
children d9473bd5ed43
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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) 2017-2020 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 size_t remainingBytes = block_.size() - blockPos_;
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70 std::streamsize r = stream_.readsome(&block_[blockPos_], remainingBytes);
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71 if (r == 0)
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72 {
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73 return false;
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74 }
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75 else
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76 {
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77 blockPos_ += r;
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78 }
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79 }
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80
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81 processedBytes_ += block_.size();
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82
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83 block.swap(block_);
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84 block_.clear();
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85 return true;
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86 }
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87 }
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88
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89 uint64_t StreamBlockReader::GetProcessedBytes() const
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90 {
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91 return processedBytes_;
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92 }
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93 }