Use HttpMetaCache to minimize network use.

logic/net/ByteArrayDownload.cpp

@@ -0,0 +1,62 @@
+#include "ByteArrayDownload.h"
+#include "MultiMC.h"
+#include <QDebug>
+
+ByteArrayDownload::ByteArrayDownload ( QUrl url )
+	: Download()
+{
+	m_url = url;
+	m_status = Job_NotStarted;
+}
+
+void ByteArrayDownload::start()
+{
+	qDebug() << "Downloading " << m_url.toString();
+	QNetworkRequest request ( m_url );
+	auto worker = MMC->qnam();
+	QNetworkReply * rep = worker->get ( request );
+	
+	m_reply = QSharedPointer<QNetworkReply> ( rep, &QObject::deleteLater );
+	connect ( rep, SIGNAL ( downloadProgress ( qint64,qint64 ) ), SLOT ( downloadProgress ( qint64,qint64 ) ) );
+	connect ( rep, SIGNAL ( finished() ), SLOT ( downloadFinished() ) );
+	connect ( rep, SIGNAL ( error ( QNetworkReply::NetworkError ) ), SLOT ( downloadError ( QNetworkReply::NetworkError ) ) );
+	connect ( rep, SIGNAL ( readyRead() ), SLOT ( downloadReadyRead() ) );
+}
+
+void ByteArrayDownload::downloadProgress ( qint64 bytesReceived, qint64 bytesTotal )
+{
+	emit progress (index_within_job, bytesReceived, bytesTotal );
+}
+
+void ByteArrayDownload::downloadError ( QNetworkReply::NetworkError error )
+{
+	// error happened during download.
+	// TODO: log the reason why
+	m_status = Job_Failed;
+}
+
+void ByteArrayDownload::downloadFinished()
+{
+	// if the download succeeded
+	if ( m_status != Job_Failed )
+	{
+		// nothing went wrong...
+		m_status = Job_Finished;
+		m_data = m_reply->readAll();
+		m_reply.clear();
+		emit succeeded(index_within_job);
+		return;
+	}
+	// else the download failed
+	else
+	{
+		m_reply.clear();
+		emit failed(index_within_job);
+		return;
+	}
+}
+
+void ByteArrayDownload::downloadReadyRead()
+{
+	// ~_~
+}