--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libutil/revnibbles.c	Sun Mar 14 05:42:37 2021 +0000
@@ -0,0 +1,40 @@
+/*
+ * This module implements some reversed-nibbles parsing functions.
+ */
+
+#include <sys/types.h>
+
+decode_reversed_nibbles(bytes, nbytes, dest)
+	u_char *bytes;
+	unsigned nbytes;
+	char *dest;
+{
+	u_char *sp;
+	char *dp;
+	unsigned n, c;
+
+	sp = bytes;
+	dp = dest;
+	for (n = 0; n < nbytes; n++) {
+		c = *sp & 0xF;
+		*dp++ = encode_hex_digit(c);
+		c = *sp >> 4;
+		*dp++ = encode_hex_digit(c);
+		sp++;
+	}
+}
+
+pack_reversed_nibbles(nibbles, bytes, nbytes)
+	u_char *nibbles, *bytes;
+	unsigned nbytes;
+{
+	u_char *sp, *dp;
+	unsigned n;
+
+	sp = nibbles;
+	dp = bytes;
+	for (n = 0; n < nbytes; n++) {
+		*dp++ = sp[0] | (sp[1] << 4);
+		sp += 2;
+	}
+}