Move files in anticipation of move to modular system

src/main/java/sound/util/Buffer.java

@@ -0,0 +1,41 @@
+package sound.util;
+
+public class Buffer {
+    protected byte[] elements;
+    public int capacity;
+    protected int index;
+    protected int size;
+
+    public Buffer(int capacity) {
+        elements = new byte[capacity];
+        this.capacity = capacity;
+        index = 0;
+        size = 0;
+    }
+
+    public synchronized void add(byte[] elements) {
+        for (byte element : elements) {
+            elements[index++ % capacity] = element;
+            if (size < capacity) {
+                ++size;
+            }
+        }
+    }
+
+    public synchronized void write(byte[] elements, int offset, int length) {
+        for (int i = offset; i < length; ++i) {
+            this.elements[(index++ % capacity)] = elements[i];
+            if (size < capacity) {
+                ++size;
+            }
+        }
+    }
+
+    public synchronized byte[] get() {
+        byte[] elements = new byte[size];
+        for (int i = 0; i < size; i++) {
+            elements[i] = elements[((index + i) % size)];
+        }
+        return elements;
+    }
+}