QNAM: New specialized QNetworkReply for data: URLs

Implement a QNetworkReplyDataImpl for data: URLs.
This avoids having the overhead of a special
backend class of QNetworkReplyImpl.
Also move the instantiation to the begin of
QNAM::createRequest() so no network sesssion is needed.

Reviewed-by: Thiago Macieira
Reviewed-by: Peter Hartmann

1 files changed, 146 insertions, 0 deletions

diff --git a/src/network/access/qnetworkreplydataimpl.cpp b/src/network/access/qnetworkreplydataimpl.cpp
new file mode 100644
index 0000000..9e74a21
--- /dev/null
+++ b/src/network/access/qnetworkreplydataimpl.cpp
@@ -0,0 +1,146 @@
+/****************************************************************************
+**
+** 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 "qnetworkreplydataimpl_p.h"
+#include "private/qdataurl_p.h"
+
+QT_BEGIN_NAMESPACE
+
+QNetworkReplyDataImplPrivate::QNetworkReplyDataImplPrivate()
+    : QNetworkReplyPrivate()
+{
+}
+
+QNetworkReplyDataImplPrivate::~QNetworkReplyDataImplPrivate()
+{
+}
+
+QNetworkReplyDataImpl::~QNetworkReplyDataImpl()
+{
+}
+
+QNetworkReplyDataImpl::QNetworkReplyDataImpl(QObject *parent, const QNetworkRequest &req, const QNetworkAccessManager::Operation op)
+    : QNetworkReply(*new QNetworkReplyDataImplPrivate(), parent)
+{
+    Q_D(QNetworkReplyDataImpl);
+    setRequest(req);
+    setUrl(req.url());
+    setOperation(op);
+    setFinished(true);
+    QNetworkReply::open(QIODevice::ReadOnly);
+
+    QUrl url = req.url();
+
+    // FIXME qDecodeDataUrl should instead be rewritten to have the QByteArray
+    // and the mime type as an output parameter and return a bool instead
+    d->decodeDataUrlResult = qDecodeDataUrl(url);
+
+    if (! d->decodeDataUrlResult.first.isNull()) {
+        QString &mimeType = d->decodeDataUrlResult.first;
+        qint64 size = d->decodeDataUrlResult.second.size();
+        setHeader(QNetworkRequest::ContentTypeHeader, mimeType);
+        setHeader(QNetworkRequest::ContentLengthHeader, size);
+        QMetaObject::invokeMethod(this, "metaDataChanged", Qt::QueuedConnection);
+
+        d->decodedData.setBuffer(&d->decodeDataUrlResult.second);
+        d->decodedData.open(QIODevice::ReadOnly);
+
+        QMetaObject::invokeMethod(this, "downloadProgress", Qt::QueuedConnection,
+                                  Q_ARG(qint64,size), Q_ARG(qint64, size));
+        QMetaObject::invokeMethod(this, "readyRead", Qt::QueuedConnection);
+        QMetaObject::invokeMethod(this, "finished", Qt::QueuedConnection);
+    } else {
+        // something wrong with this URI
+        const QString msg = QCoreApplication::translate("QNetworkAccessDataBackend",
+                                                        "Invalid URI: %1").arg(url.toString());
+        setError(QNetworkReply::ProtocolFailure, msg);
+        QMetaObject::invokeMethod(this, "error", Qt::QueuedConnection,
+                                  Q_ARG(QNetworkReply::NetworkError, QNetworkReply::ProtocolFailure));
+        QMetaObject::invokeMethod(this, "finished", Qt::QueuedConnection);
+    }
+}
+
+void QNetworkReplyDataImpl::close()
+{
+    QNetworkReply::close();
+}
+
+void QNetworkReplyDataImpl::abort()
+{
+    QNetworkReply::close();
+}
+
+qint64 QNetworkReplyDataImpl::bytesAvailable() const
+{
+    Q_D(const QNetworkReplyDataImpl);
+    return QNetworkReply::bytesAvailable() + d->decodedData.bytesAvailable();
+}
+
+bool QNetworkReplyDataImpl::isSequential () const
+{
+    return true;
+}
+
+qint64 QNetworkReplyDataImpl::size() const
+{
+    Q_D(const QNetworkReplyDataImpl);
+    return d->decodedData.size();
+}
+
+/*!
+    \internal
+*/
+qint64 QNetworkReplyDataImpl::readData(char *data, qint64 maxlen)
+{
+    Q_D(QNetworkReplyDataImpl);
+
+    // TODO idea:
+    // Instead of decoding the whole data into new memory, we could decode on demand.
+    // Note that this might be tricky to do.
+
+    return d->decodedData.read(data, maxlen);
+}
+
+
+QT_END_NAMESPACE
+
+#include "moc_qnetworkreplydataimpl_p.cpp"
+