"use strict";
const DataReader = require("./dataReader.js");
const utils = require("./utils.js");

function StringReader(data, optimizedBinaryString) {
	this.data = data;
	if (!optimizedBinaryString) {
		this.data = utils.string2binary(this.data);
	}
	this.length = this.data.length;
	this.index = 0;
	this.zero = 0;
}
StringReader.prototype = new 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.readData
 */
StringReader.prototype.readData = function (size) {
	this.checkOffset(size);
	// this will work because the constructor applied the "& 0xff" mask.
	const result = this.data.slice(
		this.zero + this.index,
		this.zero + this.index + size
	);
	this.index += size;
	return result;
};
module.exports = StringReader;