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diff --git a/indra/viewer_components/updater/llupdatedownloader.h b/indra/viewer_components/updater/llupdatedownloader.h
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+++ b/indra/viewer_components/updater/llupdatedownloader.h
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+/** 
+ * @file llupdatedownloader.h
+ *
+ * $LicenseInfo:firstyear=2010&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2010, Linden Research, Inc.
+ * 
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ * 
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#ifndef LL_UPDATE_DOWNLOADER_H
+#define LL_UPDATE_DOWNLOADER_H
+
+
+#include <string>
+#include <boost/shared_ptr.hpp>
+#include "lluri.h"
+
+
+//
+// An asynchronous download service for fetching updates.
+//
+class LLUpdateDownloader
+{
+public:
+	class Client;
+	class Implementation;
+	
+	// Returns the path to the download marker file containing details of the
+	// latest download.
+	static std::string downloadMarkerPath(void);
+	
+	LLUpdateDownloader(Client & client);
+	
+	// Cancel any in progress download; a no op if none is in progress.  The
+	// client will not receive a complete or error callback.
+	void cancel(void);
+	
+	// Start a new download.
+	void download(LLURI const & uri, std::string const & hash);
+	
+	// Returns true if a download is in progress.
+	bool isDownloading(void);
+	
+	// Resume a partial download.
+	void resume(void);
+	
+private:
+	boost::shared_ptr<Implementation> mImplementation;
+};
+
+
+//
+// An interface to be implemented by clients initiating a update download.
+//
+class LLUpdateDownloader::Client {
+public:
+	
+	// The download has completed successfully.
+	// data is a map containing the following items:
+	// url - source (remote) location
+	// hash - the md5 sum that should match the installer file.
+	// path - destination (local) location
+	// size - the size of the installer in bytes
+	virtual void downloadComplete(LLSD const & data) = 0;
+	
+	// The download failed.
+	virtual void downloadError(std::string const & message) = 0;
+};
+
+
+#endif