Use ndn_memcpy and ndn_memset based on HAVE_MEMCPY and HAVE_MEMSET
diff --git a/ndn-cpp/util/ndn_memory.h b/ndn-cpp/util/ndn_memory.h
new file mode 100644
index 0000000..07bd24c
--- /dev/null
+++ b/ndn-cpp/util/ndn_memory.h
@@ -0,0 +1,51 @@
+/*
+ * Author: Jeff Thompson
+ *
+ * BSD license, See the LICENSE file for more information.
+ */
+
+/*
+ * Based on HAVE_MEMCPY and HAVE_MEMSET in config.h, use the library version or a local implementation of memcpy and memset.
+ */
+
+#ifndef NDN_MEMORY_H
+#define NDN_MEMORY_H
+
+#include "../../config.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if HAVE_MEMCPY
+#include <memory.h>
+/**
+ * Use the library version of memcpy.
+ */
+static inline void ndn_memcpy(unsigned char *dest, unsigned char *src, unsigned int len) { memcpy(dest, src, len); }
+#else
+/**
+ * Use a local implementation of memcpy instead of the library version.
+ */
+void ndn_memcpy(unsigned char *dest, unsigned char *src, unsigned int len);
+#endif
+
+#if HAVE_MEMSET
+#include <memory.h>
+/**
+ * Use the library version of memset.
+ */
+static inline void ndn_memset(unsigned char *dest, int val, unsigned int len) { memset(dest, val, len); }
+#else
+/**
+ * Use a local implementation of memset instead of the library version.
+ */
+void ndn_memset(unsigned char *dest, int val, unsigned int len);
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+