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/*
* FileReadThread.cpp - implementation of FileReadThread class
*
* Copyright (c) 2018-2025 Tobias Junghans <tobydox@veyon.io>
*
* This file is part of Veyon - https://veyon.io
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation; either
* version 2 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program (see COPYING); if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
*/
#include "FileReadThread.h"
FileReadThread::FileReadThread( const QString& fileName, QObject* parent ) :
QObject( parent ),
m_mutex(),
m_thread( new QThread ),
m_file( nullptr ),
m_currentChunk(),
m_timer( new QTimer ),
m_fileName( fileName ),
m_chunkReady( false ),
m_filePos( 0 ),
m_fileSize( 0 )
{
m_timer->moveToThread( m_thread );
m_thread->start();
connect( m_thread, &QThread::finished, m_timer, &QObject::deleteLater );
connect( m_thread, &QThread::finished, m_thread, &QObject::deleteLater );
}
FileReadThread::~FileReadThread()
{
m_thread->quit();
}
bool FileReadThread::start()
{
if( QFile( m_fileName ).open( QFile::ReadOnly ) == false )
{
return false;
}
m_timer->singleShot( 0, this, [this]() {
m_file = new QFile( m_fileName );
m_file->open( QFile::ReadOnly );
connect( m_thread, &QThread::finished, m_file, &QObject::deleteLater );
m_mutex.lock();
m_filePos = 0;
m_fileSize = m_file->size();
m_mutex.unlock();
} );
return true;
}
QByteArray FileReadThread::currentChunk()
{
QMutexLocker lock( &m_mutex );
return m_currentChunk;
}
void FileReadThread::readNextChunk( qint64 chunkSize )
{
m_mutex.lock();
m_chunkReady = false;
m_mutex.unlock();
m_timer->singleShot( 0, this, [this, chunkSize]() {
if( m_file )
{
const auto chunk = m_file->read( chunkSize );
m_mutex.lock();
m_currentChunk = chunk;
m_chunkReady = true;
m_filePos = m_file->pos();
m_mutex.unlock();
}
} );
}
bool FileReadThread::isChunkReady()
{
QMutexLocker lock( &m_mutex );
return m_chunkReady;
}
bool FileReadThread::atEnd()
{
QMutexLocker lock( &m_mutex );
return m_filePos >= m_fileSize;
}
int FileReadThread::progress()
{
QMutexLocker lock( &m_mutex );
return m_fileSize > 0 ? static_cast<int>( m_filePos * 100 / m_fileSize ) : 0;
}
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