libglusterfs: Add checksum functions.

gf_rsync_weak_checksum:   Calculates a simple 32-bit checksum.
gf_rsync_strong_checksum: Calculates the MD5 checksum.

The strong checksum function makes use of Christophe Devine's
MD5 implementation (adapted from the rsync source code,
version 3.0.6. <http://www.samba.org/ftp/rsync/>).

Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

1 files changed, 29 insertions, 0 deletions

diff --git a/libglusterfs/src/checksum.h b/libglusterfs/src/checksum.h
new file mode 100644
index 000000000..e79340904
--- /dev/null
+++ b/libglusterfs/src/checksum.h
@@ -0,0 +1,29 @@
+/*
+   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__ */