Add byte[].Combine extension method

Author: mythz

src/ServiceStack.Text/StreamExtensions.cs

@@ -4,6 +4,7 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using System.Linq;
 using System.Text;
 using ServiceStack.Text;
 
@@ -246,7 +247,7 @@ private static byte[] ReadExactlyFast(Stream fromStream, byte[] intoBuffer, int
 
         public static string CollapseWhitespace(this string str)
         {
-            if (str == null) 
+            if (str == null)
                 return null;
 
             var sb = new StringBuilder();
@@ -267,5 +268,22 @@ public static string CollapseWhitespace(this string str)
 
             return sb.ToString();
         }
+
+        public static byte[] Combine(this byte[] bytes, params byte[][] withBytes)
+        {
+            var combinedLength = bytes.Length + withBytes.Sum(b => b.Length);
+            var to = new byte[combinedLength];
+
+            Buffer.BlockCopy(bytes, 0, to, 0, bytes.Length);
+            var pos = bytes.Length;
+
+            foreach (var b in withBytes)
+            {
+                Buffer.BlockCopy(b, 0, to, pos, b.Length);
+                pos += b.Length;
+            }
+
+            return to;
+        }
     }
 }

tests/ServiceStack.Text.Tests/DataTests.cs

@@ -81,6 +81,13 @@ public void serialize_GetValuesResponse()
 
 			Assert.That(response.Values, Has.Count.EqualTo(9));
 		}
-		
+
+	    [Test]
+	    public void Does_Combine_Byte()
+	    {
+	        var wordBytes = "HELLO".ToUtf8Bytes().Combine(" ".ToUtf8Bytes(), "WORLD".ToUtf8Bytes());
+	        var word = wordBytes.FromUtf8Bytes();
+            Assert.That(word, Is.EqualTo("HELLO WORLD"));
+	    }
 	}
 }