From 0495d3289b7f2466f5409cc5709af2f0549c4400 Mon Sep 17 00:00:00 2001
From: Ziver Koc <ziver@koc.se>
Date: Fri, 15 Apr 2016 17:50:58 +0200
Subject: [PATCH] added reverse byte order function

---
 src/zutil/ByteUtil.java      | 15 +++++++++++++++
 test/zutil/ByteUtilTest.java |  8 ++++++++
 2 files changed, 23 insertions(+)

diff --git a/src/zutil/ByteUtil.java b/src/zutil/ByteUtil.java
index ce40587..aad21cf 100755
--- a/src/zutil/ByteUtil.java
+++ b/src/zutil/ByteUtil.java
@@ -95,6 +95,21 @@ public class ByteUtil {
         return dest;
     }
 
+    /**
+     * Creates a new byte array with reversed byte ordering
+     * (LittleEndian -> BigEndian, BigEndian -> LittleEndian)
+     *
+     * @param   data    is the byte array that will be reversed.
+     * @return a new byte array that will have the same data but in reverse byte order
+     */
+    public static byte[] getReverseByteOrder(byte[] data){
+        byte[] dest = new byte[data.length];
+        if (data.length > 0)
+            for (int i=0; i<data.length; ++i)
+                dest[dest.length-1-i] = data[i];
+        return dest;
+    }
+
     /**
      * Returns a byte bitmask
      *
diff --git a/test/zutil/ByteUtilTest.java b/test/zutil/ByteUtilTest.java
index 5daf888..2000d28 100755
--- a/test/zutil/ByteUtilTest.java
+++ b/test/zutil/ByteUtilTest.java
@@ -58,4 +58,12 @@ public class ByteUtilTest {
         assertArrayEquals(new byte[]{0x00,0x01}, ByteUtil.getBits(new byte[]{0x00,0x01}, 9));
         assertArrayEquals(new byte[]{0x00,0x01}, ByteUtil.getBits(new byte[]{0x00,0x11}, 9));
     }
+
+    @Test
+    public void getReverseByteOrder(){
+        assertArrayEquals(new byte[]{}, ByteUtil.getReverseByteOrder(new byte[]{}));
+        assertArrayEquals(new byte[]{0x11}, ByteUtil.getReverseByteOrder(new byte[]{0x11}));
+        assertArrayEquals(new byte[]{0x22,0x11}, ByteUtil.getReverseByteOrder(new byte[]{0x11,0x22}));
+        assertArrayEquals(new byte[]{0x44,0x33,0x22,0x11}, ByteUtil.getReverseByteOrder(new byte[]{0x11,0x22,0x33,0x44}));
+    }
 }