Git conversion: Make reactos the root directory, move rosapps, rostests, wallpapers into modules, and delete rossubsys.

sdk/lib/cmlib/hivesum.c

@@ -0,0 +1,32 @@
+/*
+ * PROJECT:   Registry manipulation library
+ * LICENSE:   GPL - See COPYING in the top level directory
+ * COPYRIGHT: Copyright 2005 Filip Navara <navaraf@reactos.org>
+ *            Copyright 2001 - 2005 Eric Kohl
+ */
+
+#include "cmlib.h"
+
+/**
+ * @name HvpHiveHeaderChecksum
+ *
+ * Compute checksum of hive header and return it.
+ */
+
+ULONG CMAPI
+HvpHiveHeaderChecksum(
+    PHBASE_BLOCK HiveHeader)
+{
+    PULONG Buffer = (PULONG)HiveHeader;
+    ULONG Sum = 0;
+    ULONG i;
+
+    for (i = 0; i < 127; i++)
+        Sum ^= Buffer[i];
+    if (Sum == (ULONG)-1)
+        Sum = (ULONG)-2;
+    if (Sum == 0)
+        Sum = 1;
+
+    return Sum;
+}