From c2f2c0c2da6d90195ee1ff65c11ed7b94aca74bb Mon Sep 17 00:00:00 2001
From: John Jones <jmjatlanta@gmail.com>
Date: Wed, 26 Jul 2017 07:36:45 -0500
Subject: [PATCH] Added a compare method

---
 include/multiaddr/multiaddr.h |  2 ++
 multiaddr.c                   | 17 +++++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/include/multiaddr/multiaddr.h b/include/multiaddr/multiaddr.h
index 59d91da..fafc0fe 100644
--- a/include/multiaddr/multiaddr.h
+++ b/include/multiaddr/multiaddr.h
@@ -87,4 +87,6 @@ int multiaddress_get_ip_port(const struct MultiAddress* in);
  */
 char* multiaddress_get_peer_id(const struct MultiAddress* in);
 
+int multiaddress_compare(const struct MultiAddress* a, const struct MultiAddress* b);
+
 #endif
diff --git a/multiaddr.c b/multiaddr.c
index 45e3b1c..5b7beb9 100644
--- a/multiaddr.c
+++ b/multiaddr.c
@@ -347,3 +347,20 @@ int multiaddress_decapsulate(struct MultiAddress * result, char * srci)
 	}
 }
 
+int multiaddress_compare(const struct MultiAddress* a, const struct MultiAddress* b) {
+	if (a == NULL && b == NULL)
+		return 0;
+	if (a == NULL && b != NULL)
+		return -1;
+	if (a != NULL && b == NULL)
+		return 1;
+	int total = b->bsize - a->bsize;
+	if (total != 0)
+		return total;
+	for(size_t i = 0; i < b->bsize; i++) {
+		total = b->bytes[i] - a->bytes[i];
+		if (total != 0)
+			return total;
+	}
+	return 0;
+}