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diff --git a/libglusterfs/src/checksum.h b/libglusterfs/src/checksum.h
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+/*
+ Copyright (c) 2009 Z RESEARCH, Inc. <http://www.zresearch.com>
+ This file is part of GlusterFS.
+
+ GlusterFS 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 3 of the License,
+ or (at your option) any later version.
+
+ GlusterFS 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, see
+ <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __CHECKSUM_H__
+#define __CHECKSUM_H__
+
+uint32_t
+gf_rsync_weak_checksum (char *buf, int32_t len);
+
+void
+gf_rsync_strong_checksum (char *buf, int32_t len, uint8_t *sum);
+
+#endif /* __CHECKSUM_H__ */