39 lines
1020 B
JavaScript
39 lines
1020 B
JavaScript
"use strict";
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var DataReader = require("./DataReader");
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var utils = require("../utils");
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function StringReader(data) {
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DataReader.call(this, data);
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}
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utils.inherits(StringReader, DataReader);
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/**
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* @see DataReader.byteAt
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*/
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StringReader.prototype.byteAt = function(i) {
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return this.data.charCodeAt(this.zero + i);
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};
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/**
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* @see DataReader.lastIndexOfSignature
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*/
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StringReader.prototype.lastIndexOfSignature = function(sig) {
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return this.data.lastIndexOf(sig) - this.zero;
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};
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/**
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* @see DataReader.readAndCheckSignature
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*/
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StringReader.prototype.readAndCheckSignature = function (sig) {
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var data = this.readData(4);
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return sig === data;
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};
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/**
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* @see DataReader.readData
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*/
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StringReader.prototype.readData = function(size) {
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this.checkOffset(size);
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// this will work because the constructor applied the "& 0xff" mask.
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var result = this.data.slice(this.zero + this.index, this.zero + this.index + size);
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this.index += size;
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return result;
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};
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module.exports = StringReader;
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