Mercurial > hg > orthanc
view OrthancFramework/Sources/DicomFormat/StreamBlockReader.cpp @ 5161:b6dc4606ab04
release notes for 1.11.3
author | Alain Mazy <am@osimis.io> |
---|---|
date | Fri, 03 Feb 2023 14:24:43 +0100 |
parents | 43e613a7756b |
children | 0ea402b4d901 |
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/** * Orthanc - A Lightweight, RESTful DICOM Store * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics * Department, University Hospital of Liege, Belgium * Copyright (C) 2017-2022 Osimis S.A., Belgium * Copyright (C) 2021-2022 Sebastien Jodogne, ICTEAM UCLouvain, Belgium * * This program is free software: you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public License * as published by the Free Software Foundation, either version 3 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this program. If not, see * <http://www.gnu.org/licenses/>. **/ #include "../PrecompiledHeaders.h" #include "StreamBlockReader.h" #include "../OrthancException.h" namespace Orthanc { StreamBlockReader::StreamBlockReader(std::istream& stream) : stream_(stream), blockPos_(0), processedBytes_(0) { } void StreamBlockReader::Schedule(size_t blockSize) { if (!block_.empty()) { throw OrthancException(ErrorCode_BadSequenceOfCalls); } else { block_.resize(blockSize); blockPos_ = 0; } } bool StreamBlockReader::Read(std::string& block) { if (block_.empty()) { if (blockPos_ != 0) { throw OrthancException(ErrorCode_BadSequenceOfCalls); } block.clear(); return true; } else { while (blockPos_ < block_.size()) { /** * WARNING: Do NOT use "stream_.readsome()", as it does not * work properly on non-buffered stream (which is the case in * "DicomStreamReader::LookupPixelDataOffset()" for buffers) **/ size_t remainingBytes = block_.size() - blockPos_; stream_.read(&block_[blockPos_], remainingBytes); std::streamsize r = stream_.gcount(); if (r == 0) { return false; } else { blockPos_ += r; } } processedBytes_ += block_.size(); block.swap(block_); block_.clear(); return true; } } uint64_t StreamBlockReader::GetProcessedBytes() const { return processedBytes_; } }