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/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
/*
Sonic Visualiser
An audio file viewer and annotation editor.
Centre for Digital Music, Queen Mary, University of London.
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 "TempWriteFile.h"
#include "Exceptions.h"
#include <QTemporaryFile>
#include <QDir>
#include <iostream>
namespace sv {
TempWriteFile::TempWriteFile(QString target) :
m_target(target)
{
QTemporaryFile temp(m_target + ".");
temp.setAutoRemove(false);
temp.open(); // creates the file and opens it atomically
if (temp.error()) {
SVCERR << "TempWriteFile: Failed to create temporary file in directory of " << m_target << ": " << temp.errorString() << endl;
throw FileOperationFailed(temp.fileName(), "creation");
}
m_temp = temp.fileName();
temp.close(); // does not remove the file
}
TempWriteFile::~TempWriteFile()
{
if (m_temp != "") {
QDir dir(QFileInfo(m_temp).dir());
dir.remove(m_temp);
}
}
QString
TempWriteFile::getTemporaryFilename()
{
return m_temp;
}
void
TempWriteFile::moveToTarget()
{
if (m_temp == "") return;
{
QFile targetFile(m_target);
if (targetFile.exists()) {
if (!targetFile.remove()) {
SVCERR << "TempWriteFile: WARNING: Failed to remove existing target file " << m_target << " prior to moving temporary file " << m_temp << " to it" << endl;
}
}
}
{
QFile tempFile(m_temp);
if (!tempFile.rename(m_target)) {
SVCERR << "TempWriteFile: Failed to rename temporary file " << m_temp << " to target " << m_target << endl;
throw FileOperationFailed(m_temp, "rename");
}
}
#ifndef Q_OS_WIN
{
// QTemporaryFile creates files with rw------- permissions. We
// want rw-r--r-- minus umask. (Actually we want rw-rw-rw-
// minus umask, but I lack the confidence to apply a change
// that explicitly requests WriteGroup|WriteOther even though
// I know the umask should take care of it!)
QFile targetFile(m_target);
if (!targetFile.setPermissions(QFile::ReadUser |
QFile::WriteUser |
QFile::ReadGroup |
QFile::ReadOther)) {
SVDEBUG << "TempWriteFile: WARNING: Failed to update file permissions after save" << endl;
}
}
#endif
m_temp = "";
}
} // end namespace sv
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