1 files changed, 30 insertions, 0 deletions
diff --git a/mysys/checksum.c b/mysys/checksum.c
new file mode 100644
index 00000000000..00861853945
--- /dev/null
+++ b/mysys/checksum.c
@@ -0,0 +1,30 @@
+/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
+   
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public
+   License as published by the Free Software Foundation; either
+   version 2 of the License, or (at your option) any later version.
+   
+   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
+   Library General Public License for more details.
+   
+   You should have received a copy of the GNU Library General Public
+   License along with this library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+   MA 02111-1307, USA */
+
+/* Calculate a long checksum for a memoryblock. Used to verify pack_isam */
+
+#include <global.h>
+#include "my_sys.h"
+
+ulong checksum(const byte *mem, uint count)
+{
+  ulong crc;
+  for (crc=0; count-- ; mem++)
+    crc=((crc << 1) + *((uchar*) mem)) +
+      test(crc & ((ulong) 1L << (8*sizeof(ulong)-1)));
+  return crc;
+}