From e0cebbba864a3200d9579bf8401efd96fcd50c6e Mon Sep 17 00:00:00 2001
From: Roman Mandeleil <roman@ethergit.com>
Date: Wed, 25 Feb 2015 19:13:24 +0200
Subject: [PATCH] Introduce merge arrays function

---
 .../main/java/org/ethereum/util/ByteUtil.java | 25 +++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/ethereumj-core/src/main/java/org/ethereum/util/ByteUtil.java b/ethereumj-core/src/main/java/org/ethereum/util/ByteUtil.java
index 80ca6ebc..163afc15 100644
--- a/ethereumj-core/src/main/java/org/ethereum/util/ByteUtil.java
+++ b/ethereumj-core/src/main/java/org/ethereum/util/ByteUtil.java
@@ -349,4 +349,29 @@ public class ByteUtil {
         byte dataByte = data[posByte];
         return Math.min(1, (dataByte & (1 << (posBit))));
     }
+
+
+    /**
+     * @param arrays - arrays to merge
+     * @return - merged array
+     */
+    public static byte[] merge(byte[]... arrays)
+    {
+        int arrCount = 0;
+        int count = 0;
+        for (byte[] array: arrays)
+        {
+            arrCount++;
+            count += array.length;
+        }
+
+        // Create new array and copy all array contents
+        byte[] mergedArray = new byte[count];
+        int start = 0;
+        for (byte[] array: arrays) {
+            System.arraycopy(array, 0, mergedArray, start, array.length);
+            start += array.length;
+        }
+        return mergedArray;
+    }
 }
\ No newline at end of file