text: 'use strict';
  var DataReader = require('./DataReader');
  var utils = require('../utils');
  
  function StringReader(data) {
      DataReader.call(this, data);
  }
  utils.inherits(StringReader, DataReader);
  /**
   * @see DataReader.byteAt
   */
  StringReader.prototype.byteAt = function(i) {
      return this.data.charCodeAt(this.zero + i);
  };
  /**
   * @see DataReader.lastIndexOfSignature
   */
  StringReader.prototype.lastIndexOfSignature = function(sig) {
      return this.data.lastIndexOf(sig) - this.zero;
  };
  /**
   * @see DataReader.readAndCheckSignature
   */
  StringReader.prototype.readAndCheckSignature = function (sig) {
      var data = this.readData(4);
      return sig === data;
  };
  /**
   * @see DataReader.readData
   */
  StringReader.prototype.readData = function(size) {
      this.checkOffset(size);
      // this will work because the constructor applied the "& 0xff" mask.
      var result = this.data.slice(this.zero + this.index, this.zero + this.index + size);
      this.index += size;
      return result;
  };
  module.exports = StringReader;
  