From 12a415e3d5cabae1d0bdfca64156c2abcebdc9d7 Mon Sep 17 00:00:00 2001
From: P0nk <ponkcode@gmail.com>
Date: Thu, 15 Jul 2021 23:48:47 +0200
Subject: [PATCH] Add simple hex utils that delegate to Netty

The goal is to use libraries for this sort of common stuff
---
 src/main/java/tools/HexTool.java     | 11 +++++++++++
 src/test/java/tools/HexToolTest.java | 22 ++++++++++++++++++++++
 2 files changed, 33 insertions(+)
 create mode 100644 src/test/java/tools/HexToolTest.java

diff --git a/src/main/java/tools/HexTool.java b/src/main/java/tools/HexTool.java
index e610055e95..f23e2ac5fc 100644
--- a/src/main/java/tools/HexTool.java
+++ b/src/main/java/tools/HexTool.java
@@ -22,6 +22,7 @@
 package tools;
 
 import constants.string.CharsetConstants;
+import io.netty.buffer.ByteBufUtil;
 
 import java.io.ByteArrayOutputStream;
 
@@ -105,4 +106,14 @@ public class HexTool {
         return "";
     }
 
+    /**
+     * Get upper case hex dump
+     */
+    public static String bytesToHex(byte[] bytes) {
+        return ByteBufUtil.hexDump(bytes).toUpperCase();
+    }
+
+    public static byte[] hexToBytes(String hex) {
+        return ByteBufUtil.decodeHexDump(hex);
+    }
 }
diff --git a/src/test/java/tools/HexToolTest.java b/src/test/java/tools/HexToolTest.java
new file mode 100644
index 0000000000..8ea59c403a
--- /dev/null
+++ b/src/test/java/tools/HexToolTest.java
@@ -0,0 +1,22 @@
+package tools;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class HexToolTest {
+
+    @Test
+    void upperCaseHexToBytesAndBack() {
+        String hex = "A1B2C3";
+        byte[] bytes = HexTool.hexToBytes(hex);
+        assertEquals(hex, HexTool.bytesToHex(bytes));
+    }
+
+    @Test
+    void mixedCaseHexToBytesAndBack() {
+        String hex = "aB5DaA";
+        byte[] bytes = HexTool.hexToBytes(hex);
+        assertEquals(hex.toUpperCase(), HexTool.bytesToHex(bytes));
+    }
+}
\ No newline at end of file