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/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtNetwork module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qnetworkaccessfilebackend_p.h"
#include "qfileinfo.h"
#include "qurlinfo.h"
#include "qdir.h"
#include "private/qnoncontiguousbytedevice_p.h"
#include <QtCore/QCoreApplication>
QT_BEGIN_NAMESPACE
QNetworkAccessBackend *
QNetworkAccessFileBackendFactory::create(QNetworkAccessManager::Operation op,
const QNetworkRequest &request) const
{
// is it an operation we know of?
switch (op) {
case QNetworkAccessManager::GetOperation:
case QNetworkAccessManager::PutOperation:
break;
default:
// no, we can't handle this operation
return 0;
}
QUrl url = request.url();
if (url.scheme().compare(QLatin1String("qrc"), Qt::CaseInsensitive) == 0 || url.isLocalFile()) {
return new QNetworkAccessFileBackend;
} else if (!url.scheme().isEmpty() && url.authority().isEmpty()) {
// check if QFile could, in theory, open this URL via the file engines
// it has to be in the format:
// prefix:path/to/file
// or prefix:/path/to/file
//
// this construct here must match the one below in open()
QFileInfo fi(url.toString(QUrl::RemoveAuthority | QUrl::RemoveFragment | QUrl::RemoveQuery));
if (fi.exists() || (op == QNetworkAccessManager::PutOperation && fi.dir().exists()))
return new QNetworkAccessFileBackend;
}
return 0;
}
QNetworkAccessFileBackend::QNetworkAccessFileBackend()
: uploadByteDevice(0), totalBytes(0), hasUploadFinished(false)
{
}
QNetworkAccessFileBackend::~QNetworkAccessFileBackend()
{
}
void QNetworkAccessFileBackend::open()
{
QUrl url = this->url();
if (url.host() == QLatin1String("localhost"))
url.setHost(QString());
#if !defined(Q_OS_WIN)
// do not allow UNC paths on Unix
if (!url.host().isEmpty()) {
// we handle only local files
error(QNetworkReply::ProtocolInvalidOperationError,
QCoreApplication::translate("QNetworkAccessFileBackend", "Request for opening non-local file %1").arg(url.toString()));
finished();
return;
}
#endif // !defined(Q_OS_WIN)
if (url.path().isEmpty())
url.setPath(QLatin1String("/"));
setUrl(url);
QString fileName = url.toLocalFile();
if (fileName.isEmpty()) {
if (url.scheme() == QLatin1String("qrc"))
fileName = QLatin1Char(':') + url.path();
else
fileName = url.toString(QUrl::RemoveAuthority | QUrl::RemoveFragment | QUrl::RemoveQuery);
}
file.setFileName(fileName);
if (operation() == QNetworkAccessManager::GetOperation) {
if (!loadFileInfo())
return;
}
QIODevice::OpenMode mode;
switch (operation()) {
case QNetworkAccessManager::GetOperation:
mode = QIODevice::ReadOnly;
break;
case QNetworkAccessManager::PutOperation:
mode = QIODevice::WriteOnly | QIODevice::Truncate;
uploadByteDevice = createUploadByteDevice();
QObject::connect(uploadByteDevice, SIGNAL(readyRead()), this, SLOT(uploadReadyReadSlot()));
QMetaObject::invokeMethod(this, "uploadReadyReadSlot", Qt::QueuedConnection);
break;
default:
Q_ASSERT_X(false, "QNetworkAccessFileBackend::open",
"Got a request operation I cannot handle!!");
return;
}
mode |= QIODevice::Unbuffered;
bool opened = file.open(mode);
// could we open the file?
if (!opened) {
QString msg = QCoreApplication::translate("QNetworkAccessFileBackend", "Error opening %1: %2")
.arg(this->url().toString(), file.errorString());
// why couldn't we open the file?
// if we're opening for reading, either it doesn't exist, or it's access denied
// if we're opening for writing, not existing means it's access denied too
if (file.exists() || operation() == QNetworkAccessManager::PutOperation)
error(QNetworkReply::ContentAccessDenied, msg);
else
error(QNetworkReply::ContentNotFoundError, msg);
finished();
}
}
void QNetworkAccessFileBackend::uploadReadyReadSlot()
{
if (hasUploadFinished)
return;
forever {
qint64 haveRead;
const char *readPointer = uploadByteDevice->readPointer(-1, haveRead);
if (haveRead == -1) {
// EOF
hasUploadFinished = true;
file.flush();
file.close();
finished();
break;
} else if (haveRead == 0 || readPointer == 0) {
// nothing to read right now, we will be called again later
break;
} else {
qint64 haveWritten;
haveWritten = file.write(readPointer, haveRead);
if (haveWritten < 0) {
// write error!
QString msg = QCoreApplication::translate("QNetworkAccessFileBackend", "Write error writing to %1: %2")
.arg(url().toString(), file.errorString());
error(QNetworkReply::ProtocolFailure, msg);
finished();
return;
} else {
uploadByteDevice->advanceReadPointer(haveWritten);
}
file.flush();
}
}
}
void QNetworkAccessFileBackend::closeDownstreamChannel()
{
if (operation() == QNetworkAccessManager::GetOperation) {
file.close();
}
}
void QNetworkAccessFileBackend::downstreamReadyWrite()
{
Q_ASSERT_X(operation() == QNetworkAccessManager::GetOperation, "QNetworkAccessFileBackend",
"We're being told to download data but operation isn't GET!");
readMoreFromFile();
}
bool QNetworkAccessFileBackend::loadFileInfo()
{
QFileInfo fi(file);
setHeader(QNetworkRequest::LastModifiedHeader, fi.lastModified());
setHeader(QNetworkRequest::ContentLengthHeader, fi.size());
// signal we're open
metaDataChanged();
if (fi.isDir()) {
error(QNetworkReply::ContentOperationNotPermittedError,
QCoreApplication::translate("QNetworkAccessFileBackend", "Cannot open %1: Path is a directory").arg(url().toString()));
finished();
return false;
}
return true;
}
bool QNetworkAccessFileBackend::readMoreFromFile()
{
qint64 wantToRead;
while ((wantToRead = nextDownstreamBlockSize()) > 0) {
// ### FIXME!!
// Obtain a pointer from the ringbuffer!
// Avoid extra copy
QByteArray data;
data.reserve(wantToRead);
qint64 actuallyRead = file.read(data.data(), wantToRead);
if (actuallyRead <= 0) {
// EOF or error
if (file.error() != QFile::NoError) {
QString msg = QCoreApplication::translate("QNetworkAccessFileBackend", "Read error reading from %1: %2")
.arg(url().toString(), file.errorString());
error(QNetworkReply::ProtocolFailure, msg);
finished();
return false;
}
finished();
return true;
}
data.resize(actuallyRead);
totalBytes += actuallyRead;
QByteDataBuffer list;
list.append(data);
data.clear(); // important because of implicit sharing!
writeDownstreamData(list);
}
return true;
}
QT_END_NAMESPACE
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