First Commit

java/src/com/zerotier/sdk/util/StringUtils.java

@@ -0,0 +1,52 @@
+/*
+ * ZeroTier One - Network Virtualization Everywhere
+ * Copyright (C) 2011-2023  ZeroTier, Inc.  https://www.zerotier.com/
+ */
+
+package com.zerotier.sdk.util;
+
+public class StringUtils {
+
+    /**
+     * Convert mac address to string.
+     *
+     * @param mac MAC address
+     * @return string in XX:XX:XX:XX:XX:XX format
+     */
+    public static String macAddressToString(long mac) {
+
+        int[] macChars = new int[6];
+        for (int i = 0; i < 6; i++) {
+            macChars[i] = (int) (mac % 256);
+            mac >>= 8;
+        }
+
+        return String.format("%02x:%02x:%02x:%02x:%02x:%02x", macChars[5], macChars[4], macChars[3], macChars[2], macChars[1], macChars[0]);
+    }
+
+    /**
+     * Convert long to hex string.
+     *
+     * @param networkId long
+     * @return string with 0 padding
+     */
+    public static String networkIdToString(long networkId) {
+        return String.format("%016x", networkId);
+    }
+
+    /**
+     * Convert node address to string.
+     *
+     * Node addresses are 40 bits, so print 10 hex characters.
+     *
+     * @param address Node address
+     * @return formatted string
+     */
+    public static String addressToString(long address) {
+        return String.format("%010x", address);
+    }
+
+    public static String etherTypeToString(long etherType) {
+        return String.format("%04x", etherType);
+    }
+}