code: function appendBuffer(buffer1, buffer2) {
    var tmp = new Uint8Array(buffer1.byteLength + buffer2.byteLength);
    tmp.set(new Uint8Array(buffer1), 0);
    tmp.set(new Uint8Array(buffer2), buffer1.byteLength);
    return tmp.buffer;
  }
docs: Creates a new Uint8Array based on two different ArrayBuffers
  
  @param {ArrayBuffers} buffer1 The first buffer.
  @param {ArrayBuffers} buffer2 The second buffer.
  @return {ArrayBuffers} The new ArrayBuffer created out of the two.