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// -*- c-indentation-style:"stroustrup" c-basic-offset: 4 -*-
/*
Rosegarden-4
A sequencer and musical notation editor.
This program is Copyright 2000-2005
Guillaume Laurent <glaurent@telegraph-road.org>,
Chris Cannam <cannam@all-day-breakfast.com>,
Richard Bown <bownie@bownie.com>
The moral right of the authors to claim authorship of this work
has been asserted.
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. See the file
COPYING included with this distribution for more information.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <unistd.h>
#include <errno.h>
#include <qdir.h>
#include "sequencermapper.h"
#include "rosedebug.h"
#include "RealTime.h"
#include "Exception.h"
#include "MappedEvent.h"
#include "MappedComposition.h"
SequencerMapper::SequencerMapper(const QString filename)
: m_fd(-1),
m_mmappedSize(0),
m_mmappedBuffer((void *)0),
m_filename(filename)
{
RG_DEBUG << "SequencerMapper::SequencerMapper - mmapping " << filename << endl;
map();
}
SequencerMapper::~SequencerMapper()
{
unmap();
}
void
SequencerMapper::map()
{
QFileInfo fInfo(m_filename);
if (!fInfo.exists()) {
RG_DEBUG << "SequencerMapper::map() : file " << m_filename << " doesn't exist\n";
throw Rosegarden::Exception("file not found");
}
m_fd = ::open(m_filename.latin1(), O_RDWR);
if (m_fd < 0) {
RG_DEBUG << "SequencerMapper::map() : Couldn't open " << m_filename
<< endl;
throw Rosegarden::Exception("Couldn't open " + std::string(m_filename.data()));
}
m_mmappedSize = sizeof(Rosegarden::SequencerDataBlock);
m_mmappedBuffer = (long*)::mmap(0, m_mmappedSize, PROT_READ, MAP_SHARED, m_fd, 0);
if (m_mmappedBuffer == (void*)-1) {
RG_DEBUG << QString("mmap failed : (%1) %2\n").
arg(errno).arg(strerror(errno));
throw Rosegarden::Exception("mmap failed");
}
RG_DEBUG << "SequencerMapper::map() : "
<< (void*)m_mmappedBuffer << "," << m_mmappedSize << endl;
m_sequencerDataBlock = new (m_mmappedBuffer)
Rosegarden::SequencerDataBlock(false);
}
void
SequencerMapper::unmap()
{
::munmap(m_mmappedBuffer, m_mmappedSize);
::close(m_fd);
}
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