1 files changed, 48 insertions, 0 deletions
diff --git a/contrib/ipfilter/lib/fill6bits.c b/contrib/ipfilter/lib/fill6bits.c
new file mode 100644
index 0000000..39ec735
--- /dev/null
+++ b/contrib/ipfilter/lib/fill6bits.c
@@ -0,0 +1,48 @@
+/*	$FreeBSD$	*/
+
+/*
+ * Copyright (C) 2012 by Darren Reed.
+ *
+ * See the IPFILTER.LICENCE file for details on licencing.
+ *
+ * $Id$
+ */
+
+#include "ipf.h"
+
+
+void fill6bits(bits, msk)
+	int bits;
+	u_int *msk;
+{
+	if (bits == 0) {
+		msk[0] = 0;
+		msk[1] = 0;
+		msk[2] = 0;
+		msk[3] = 0;
+		return;
+	}
+
+	msk[0] = 0xffffffff;
+	msk[1] = 0xffffffff;
+	msk[2] = 0xffffffff;
+	msk[3] = 0xffffffff;
+
+	if (bits == 128)
+		return;
+	if (bits > 96) {
+		msk[3] = htonl(msk[3] << (128 - bits));
+	} else if (bits > 64) {
+		msk[3] = 0;
+		msk[2] = htonl(msk[2] << (96 - bits));
+	} else if (bits > 32) {
+		msk[3] = 0;
+		msk[2] = 0;
+		msk[1] = htonl(msk[1] << (64 - bits));
+	} else {
+		msk[3] = 0;
+		msk[2] = 0;
+		msk[1] = 0;
+		msk[0] = htonl(msk[0] << (32 - bits));
+	}
+}