1 files changed, 105 insertions, 0 deletions
diff --git a/src/gui/seqmanager/SequencerMapper.cpp b/src/gui/seqmanager/SequencerMapper.cpp
new file mode 100644
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+++ b/src/gui/seqmanager/SequencerMapper.cpp
@@ -0,0 +1,105 @@
+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
+
+/*
+    Rosegarden
+    A MIDI and audio sequencer and musical notation editor.
+ 
+    This program is Copyright 2000-2008
+        Guillaume Laurent   <[email protected]>,
+        Chris Cannam        <[email protected]>,
+        Richard Bown        <[email protected]>
+ 
+    The moral rights of Guillaume Laurent, Chris Cannam, and Richard
+    Bown to claim authorship of this work have been asserted.
+ 
+    Other copyrights also apply to some parts of this work.  Please
+    see the AUTHORS file and individual file headers for details.
+ 
+    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 "SequencerMapper.h"
+
+#include "misc/Debug.h"
+#include "base/Exception.h"
+#include "base/MidiProgram.h"
+#include "base/RealTime.h"
+#include "base/Track.h"
+#include "sound/MappedComposition.h"
+#include "sound/MappedEvent.h"
+#include "sound/SequencerDataBlock.h"
+#include <qfileinfo.h>
+#include <qstring.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <errno.h>
+
+
+namespace Rosegarden
+{
+
+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 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 Exception("Couldn't open " + std::string(m_filename.data()));
+    }
+
+    m_mmappedSize = sizeof(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 Exception("mmap failed");
+    }
+
+    RG_DEBUG << "SequencerMapper::map() : "
+    << (void*)m_mmappedBuffer << "," << m_mmappedSize << endl;
+
+    m_sequencerDataBlock = new (m_mmappedBuffer)
+                           SequencerDataBlock(false);
+}
+
+void
+SequencerMapper::unmap()
+{
+    ::munmap(m_mmappedBuffer, m_mmappedSize);
+    ::close(m_fd);
+}
+
+}