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'use strict';
var DataReader = require('./dataReader');
var utils = require('./utils');

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.
    var result = this.data.slice(this.zero + this.index, this.zero + this.index + size);
    this.index += size;
    return result;
};
module.exports = StringReader;