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annotate OrthancFramework/Sources/DicomFormat/StreamBlockReader.cpp @ 4955:1610e56cadfb

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fix ParsedDicomFile::DecodeOverlay() for WebAssembly
author Sebastien Jodogne <s.jodogne@gmail.com>
date Wed, 23 Mar 2022 11:44:40 +0100
parents 43e613a7756b
children 0ea402b4d901
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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) 2017-2022 Osimis S.A., Belgium
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6 * Copyright (C) 2021-2022 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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7 *
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8 * This program is free software: you can redistribute it and/or
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9 * modify it under the terms of the GNU Lesser General Public License
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10 * as published by the Free Software Foundation, either version 3 of
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11 * the License, or (at your option) any later version.
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12 *
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13 * This program is distributed in the hope that it will be useful, but
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14 * WITHOUT ANY WARRANTY; without even the implied warranty of
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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16 * Lesser General Public License for more details.
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17 *
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18 * You should have received a copy of the GNU Lesser General Public
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19 * License along with this program. If not, see
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20 * <http://www.gnu.org/licenses/>.
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21 **/
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22
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23
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24 #include "../PrecompiledHeaders.h"
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25 #include "StreamBlockReader.h"
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26
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27 #include "../OrthancException.h"
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28
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29
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30 namespace Orthanc
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31 {
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32 StreamBlockReader::StreamBlockReader(std::istream& stream) :
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33 stream_(stream),
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34 blockPos_(0),
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35 processedBytes_(0)
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36 {
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37 }
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38
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39
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40 void StreamBlockReader::Schedule(size_t blockSize)
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41 {
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42 if (!block_.empty())
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43 {
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44 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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45 }
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46 else
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47 {
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48 block_.resize(blockSize);
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49 blockPos_ = 0;
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50 }
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51 }
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52
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53
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54 bool StreamBlockReader::Read(std::string& block)
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55 {
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56 if (block_.empty())
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57 {
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58 if (blockPos_ != 0)
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59 {
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60 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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61 }
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62
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63 block.clear();
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64 return true;
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65 }
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66 else
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67 {
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68 while (blockPos_ < block_.size())
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69 {
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70 /**
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71 * WARNING: Do NOT use "stream_.readsome()", as it does not
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72 * work properly on non-buffered stream (which is the case in
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73 * "DicomStreamReader::LookupPixelDataOffset()" for buffers)
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74 **/
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75
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76 size_t remainingBytes = block_.size() - blockPos_;
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77 stream_.read(&block_[blockPos_], remainingBytes);
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78
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79 std::streamsize r = stream_.gcount();
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80 if (r == 0)
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81 {
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82 return false;
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83 }
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84 else
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85 {
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86 blockPos_ += r;
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87 }
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88 }
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89
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90 processedBytes_ += block_.size();
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91
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92 block.swap(block_);
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93 block_.clear();
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94 return true;
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95 }
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96 }
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97
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98 uint64_t StreamBlockReader::GetProcessedBytes() const
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99 {
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100 return processedBytes_;
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101 }
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102 }