Use HttpMetaCache to minimize network use.

logic/net/FileDownload.h

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+#pragma once
+
+#include "Download.h"
+#include <QFile>
+
+class FileDownload : public Download
+{
+	Q_OBJECT
+public:
+	/// if true, check the md5sum against a provided md5sum
+	/// also, if a file exists, perform an md5sum first and don't download only if they don't match
+	bool m_check_md5;
+	/// the expected md5 checksum
+	QString m_expected_md5;
+	/// is the saving file already open?
+	bool m_opened_for_saving;
+	/// if saving to file, use the one specified in this string
+	QString m_target_path;
+	/// this is the output file, if any
+	QFile m_output_file;
+	
+public:
+	explicit FileDownload(QUrl url, QString target_path);
+	
+protected slots:
+	virtual void downloadProgress(qint64 bytesReceived, qint64 bytesTotal);
+	virtual void downloadError(QNetworkReply::NetworkError error);
+	virtual void downloadFinished();
+	virtual void downloadReadyRead();
+	
+public slots:
+	virtual void start();
+};
+
+typedef QSharedPointer<FileDownload> FileDownloadPtr;