code: function getViewTag(view, offset) {
      var tag = '', i;
      for (i = offset; i < offset + 4; i += 1) {
          tag += String.fromCharCode(view.getInt8(i));
      }
      return tag;
  }
docs: Retrieve a 4-character tag from the DataView.
  
  @param  {DataView} view       DataView
  @param  {number} strLen     string length
  @param  {number} byteOffset byteOffset
  @return {string}            string