104 lines
2.5 KiB
C++
104 lines
2.5 KiB
C++
/**
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* Orthanc - A Lightweight, RESTful DICOM Store
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* Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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* Department, University Hospital of Liege, Belgium
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* Copyright (C) 2017-2023 Osimis S.A., Belgium
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* Copyright (C) 2024-2025 Orthanc Team SRL, Belgium
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* Copyright (C) 2021-2025 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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*
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* This program is free software: you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation, either version 3 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program. If not, see
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* <http://www.gnu.org/licenses/>.
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**/
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#include "../PrecompiledHeaders.h"
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#include "StreamBlockReader.h"
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#include "../OrthancException.h"
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namespace Orthanc
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{
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StreamBlockReader::StreamBlockReader(std::istream& stream) :
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stream_(stream),
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blockPos_(0),
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processedBytes_(0)
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{
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}
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void StreamBlockReader::Schedule(size_t blockSize)
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{
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if (!block_.empty())
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{
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throw OrthancException(ErrorCode_BadSequenceOfCalls);
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}
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else
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{
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block_.resize(blockSize);
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blockPos_ = 0;
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}
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}
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bool StreamBlockReader::Read(std::string& block)
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{
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if (block_.empty())
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{
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if (blockPos_ != 0)
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{
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throw OrthancException(ErrorCode_BadSequenceOfCalls);
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}
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block.clear();
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return true;
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}
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else
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{
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while (blockPos_ < block_.size())
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{
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/**
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* WARNING: Do NOT use "stream_.readsome()", as it does not
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* work properly on non-buffered stream (which is the case in
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* "DicomStreamReader::LookupPixelDataOffset()" for buffers)
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**/
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size_t remainingBytes = block_.size() - blockPos_;
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stream_.read(&block_[blockPos_], remainingBytes);
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std::streamsize r = stream_.gcount();
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if (r == 0)
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{
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return false;
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}
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else
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{
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blockPos_ += r;
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}
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}
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processedBytes_ += block_.size();
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block.swap(block_);
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block_.clear();
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return true;
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}
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}
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uint64_t StreamBlockReader::GetProcessedBytes() const
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{
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return processedBytes_;
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}
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}
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