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'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;