Get a buffer from an array of strings.
function array(arr) {
  var buffers = []
    , buf
    , i
    , len = 0;
  for(i = 0; i < arr.length; i++) {
    buf = this.getStringBuffer(arr[i]);
    len += buf.length;
    buffers.push(buf);
  }
  return Buffer.concat(buffers, len);
}