DataBuffer, which is DataOutput to byte[].

I tired of typing ByteArrayOutputStream.

gdx/src/com/badlogic/gdx/utils/DataBuffer.java

@@ -0,0 +1,28 @@
+
+package com.badlogic.gdx.utils;
+
+import com.badlogic.gdx.utils.StreamUtils.OptimizedByteArrayOutputStream;
+
+/** Extends {@link DataOutput} that writes bytes to a byte array.
+ * @author Nathan Sweet */
+public class DataBuffer extends DataOutput {
+	private final OptimizedByteArrayOutputStream outStream;
+
+	public DataBuffer () {
+		this(32);
+	}
+
+	public DataBuffer (int initialSize) {
+		super(new OptimizedByteArrayOutputStream(initialSize));
+		outStream = (OptimizedByteArrayOutputStream)out;
+	}
+
+	/** Returns the backing array, which has 0 to {@link #size()} items. */
+	public byte[] getBuffer () {
+		return outStream.getBuffer();
+	}
+
+	public byte[] toArray () {
+		return outStream.toByteArray();
+	}
+}

gdx/src/com/badlogic/gdx/utils/DataOutput.java

@@ -16,6 +16,7 @@
 
 package com.badlogic.gdx.utils;
 
+import java.io.ByteArrayOutputStream;
 import java.io.DataOutputStream;
 import java.io.IOException;
 import java.io.OutputStream;

gdx/src/com/badlogic/gdx/utils/StreamUtils.java

@@ -93,8 +93,8 @@ public static void closeQuietly (Closeable c) {
 	}
 
 	/** A ByteArrayOutputStream which avoids copying of the byte array if not necessary. */
-	private static class OptimizedByteArrayOutputStream extends ByteArrayOutputStream {
-		OptimizedByteArrayOutputStream (int initialSize) {
+	static public class OptimizedByteArrayOutputStream extends ByteArrayOutputStream {
+		public OptimizedByteArrayOutputStream (int initialSize) {
 			super(initialSize);
 		}
 
@@ -103,5 +103,9 @@ public synchronized byte[] toByteArray () {
 			if (count == buf.length) return buf;
 			return super.toByteArray();
 		}
+
+		public byte[] getBuffer () {
+			return buf;
+		}
 	}
 }