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diff --git a/digital/ucoolib/ucoolib/dev/xmodem/xmodem.hh b/digital/ucoolib/ucoolib/dev/xmodem/xmodem.hh
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+#ifndef ucoolib_dev_xmodem_xmodem_hh
+#define ucoolib_dev_xmodem_xmodem_hh
+// ucoolib - Microcontroller object oriented library. {{{
+//
+// Copyright (C) 2013 Nicolas Schodet
+//
+// APBTeam:
+// Web: http://apbteam.org/
+// Email: team AT apbteam DOT org
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// This program 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 General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+//
+// }}}
+#include "ucoolib/intf/stream.hh"
+
+namespace ucoo {
+
+/// Handle data received from XMODEM.
+class XmodemReceiver
+{
+ public:
+ /// Write up to COUNT bytes of data from BUF to stream. Return the number
+ /// of written bytes or -1 on error.
+ virtual int write (const char *buf, int count) = 0;
+};
+
+/// Make a XMODEM reception from stream and write any received data to
+/// receiver.
+int
+xmodem_receive (Stream &s, XmodemReceiver &receiver);
+
+} // namespace ucoo
+
+#endif // ucoolib_dev_xmodem_xmodem_hh