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<html lang="en">
<head>
<title>Code coverage report for parser.js</title>
<meta charset="utf-8" />
<link rel="stylesheet" href="prettify.css" />
<link rel="stylesheet" href="base.css" />
<link rel="shortcut icon" type="image/x-icon" href="favicon.png" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<style type='text/css'>
.coverage-summary .sorter {
background-image: url(sort-arrow-sprite.png);
}
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</head>
<body>
<div class='wrapper'>
<div class='pad1'>
<h1><a href="index.html">All files</a> parser.js</h1>
<div class='clearfix'>
<div class='fl pad1y space-right2'>
<span class="strong">90.57% </span>
<span class="quiet">Statements</span>
<span class='fraction'>144/159</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">85.45% </span>
<span class="quiet">Branches</span>
<span class='fraction'>47/55</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">100% </span>
<span class="quiet">Functions</span>
<span class='fraction'>20/20</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">90.32% </span>
<span class="quiet">Lines</span>
<span class='fraction'>140/155</span>
</div>
</div>
<p class="quiet">
Press <em>n</em> or <em>j</em> to go to the next uncovered block, <em>b</em>, <em>p</em> or <em>k</em> for the previous block.
</p>
</div>
<div class='status-line high'></div>
<pre><table class="coverage">
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<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">"use strict";
&nbsp;
let constants = require("./constants");
let CrcCalculator = require("./crc");
&nbsp;
let Parser = (module.exports = function (options, dependencies) {
this._options = options;
options.checkCRC = options.checkCRC !== false;
&nbsp;
this._hasIHDR = false;
this._hasIEND = false;
this._emittedHeadersFinished = false;
&nbsp;
// input flags/metadata
this._palette = [];
this._colorType = 0;
&nbsp;
this._chunks = {};
this._chunks[constants.TYPE_IHDR] = this._handleIHDR.bind(this);
this._chunks[constants.TYPE_IEND] = this._handleIEND.bind(this);
this._chunks[constants.TYPE_IDAT] = this._handleIDAT.bind(this);
this._chunks[constants.TYPE_PLTE] = this._handlePLTE.bind(this);
this._chunks[constants.TYPE_tRNS] = this._handleTRNS.bind(this);
this._chunks[constants.TYPE_gAMA] = this._handleGAMA.bind(this);
&nbsp;
this.read = dependencies.read;
this.error = dependencies.error;
this.metadata = dependencies.metadata;
this.gamma = dependencies.gamma;
this.transColor = dependencies.transColor;
this.palette = dependencies.palette;
this.parsed = dependencies.parsed;
this.inflateData = dependencies.inflateData;
this.finished = dependencies.finished;
this.simpleTransparency = dependencies.simpleTransparency;
this.headersFinished = dependencies.headersFinished || function () {};
});
&nbsp;
Parser.prototype.start = function () {
this.read(constants.PNG_SIGNATURE.length, this._parseSignature.bind(this));
};
&nbsp;
Parser.prototype._parseSignature = function (data) {
let signature = constants.PNG_SIGNATURE;
&nbsp;
for (let i = 0; i &lt; signature.length; i++) {
if (data[i] !== signature[i]) {
this.error(new Error("Invalid file signature"));
return;
}
}
this.read(8, this._parseChunkBegin.bind(this));
};
&nbsp;
Parser.prototype._parseChunkBegin = function (data) {
// chunk content length
let length = data.readUInt32BE(0);
&nbsp;
// chunk type
let type = data.readUInt32BE(4);
let name = "";
for (let i = 4; i &lt; 8; i++) {
name += String.fromCharCode(data[i]);
}
&nbsp;
//console.log('chunk ', name, length);
&nbsp;
// chunk flags
let ancillary = Boolean(data[4] &amp; 0x20); // or critical
// priv = Boolean(data[5] &amp; 0x20), // or public
// safeToCopy = Boolean(data[7] &amp; 0x20); // or unsafe
&nbsp;
<span class="missing-if-branch" title="if path not taken" >I</span>if (!this._hasIHDR &amp;&amp; type !== constants.TYPE_IHDR) {
<span class="cstat-no" title="statement not covered" > this.error(new Error("Expected IHDR on beggining"));</span>
<span class="cstat-no" title="statement not covered" > return;</span>
}
&nbsp;
this._crc = new CrcCalculator();
this._crc.write(Buffer.from(name));
&nbsp;
if (this._chunks[type]) {
return this._chunks[type](length);
}
&nbsp;
<span class="missing-if-branch" title="if path not taken" >I</span>if (!ancillary) {
<span class="cstat-no" title="statement not covered" > this.error(new Error("Unsupported critical chunk type " + name));</span>
<span class="cstat-no" title="statement not covered" > return;</span>
}
&nbsp;
this.read(length + 4, this._skipChunk.bind(this));
};
&nbsp;
Parser.prototype._skipChunk = function (/*data*/) {
this.read(8, this._parseChunkBegin.bind(this));
};
&nbsp;
Parser.prototype._handleChunkEnd = function () {
this.read(4, this._parseChunkEnd.bind(this));
};
&nbsp;
Parser.prototype._parseChunkEnd = function (data) {
let fileCrc = data.readInt32BE(0);
let calcCrc = this._crc.crc32();
&nbsp;
// check CRC
if (this._options.checkCRC &amp;&amp; calcCrc !== fileCrc) {
this.error(new Error("Crc error - " + fileCrc + " - " + calcCrc));
return;
}
&nbsp;
if (!this._hasIEND) {
this.read(8, this._parseChunkBegin.bind(this));
}
};
&nbsp;
Parser.prototype._handleIHDR = function (length) {
this.read(length, this._parseIHDR.bind(this));
};
Parser.prototype._parseIHDR = function (data) {
this._crc.write(data);
&nbsp;
let width = data.readUInt32BE(0);
let height = data.readUInt32BE(4);
let depth = data[8];
let colorType = data[9]; // bits: 1 palette, 2 color, 4 alpha
let compr = data[10];
let filter = data[11];
let interlace = data[12];
&nbsp;
// console.log(' width', width, 'height', height,
// 'depth', depth, 'colorType', colorType,
// 'compr', compr, 'filter', filter, 'interlace', interlace
// );
&nbsp;
if (
depth !== 8 &amp;&amp;
depth !== 4 &amp;&amp;
depth !== 2 &amp;&amp;
depth !== 1 &amp;&amp;
depth !== 16
) {
this.error(new Error("Unsupported bit depth " + depth));
return;
}
if (!(colorType in constants.COLORTYPE_TO_BPP_MAP)) {
this.error(new Error("Unsupported color type"));
return;
}
<span class="missing-if-branch" title="if path not taken" >I</span>if (compr !== 0) {
<span class="cstat-no" title="statement not covered" > this.error(new Error("Unsupported compression method"));</span>
<span class="cstat-no" title="statement not covered" > return;</span>
}
<span class="missing-if-branch" title="if path not taken" >I</span>if (filter !== 0) {
<span class="cstat-no" title="statement not covered" > this.error(new Error("Unsupported filter method"));</span>
<span class="cstat-no" title="statement not covered" > return;</span>
}
<span class="missing-if-branch" title="if path not taken" >I</span>if (interlace !== 0 &amp;&amp; interlace !== 1) {
<span class="cstat-no" title="statement not covered" > this.error(new Error("Unsupported interlace method"));</span>
<span class="cstat-no" title="statement not covered" > return;</span>
}
&nbsp;
this._colorType = colorType;
&nbsp;
let bpp = constants.COLORTYPE_TO_BPP_MAP[this._colorType];
&nbsp;
this._hasIHDR = true;
&nbsp;
this.metadata({
width: width,
height: height,
depth: depth,
interlace: Boolean(interlace),
palette: Boolean(colorType &amp; constants.COLORTYPE_PALETTE),
color: Boolean(colorType &amp; constants.COLORTYPE_COLOR),
alpha: Boolean(colorType &amp; constants.COLORTYPE_ALPHA),
bpp: bpp,
colorType: colorType,
});
&nbsp;
this._handleChunkEnd();
};
&nbsp;
Parser.prototype._handlePLTE = function (length) {
this.read(length, this._parsePLTE.bind(this));
};
Parser.prototype._parsePLTE = function (data) {
this._crc.write(data);
&nbsp;
let entries = Math.floor(data.length / 3);
// console.log('Palette:', entries);
&nbsp;
for (let i = 0; i &lt; entries; i++) {
this._palette.push([data[i * 3], data[i * 3 + 1], data[i * 3 + 2], 0xff]);
}
&nbsp;
this.palette(this._palette);
&nbsp;
this._handleChunkEnd();
};
&nbsp;
Parser.prototype._handleTRNS = function (length) {
this.simpleTransparency();
this.read(length, this._parseTRNS.bind(this));
};
Parser.prototype._parseTRNS = function (data) {
this._crc.write(data);
&nbsp;
// palette
if (this._colorType === constants.COLORTYPE_PALETTE_COLOR) {
<span class="missing-if-branch" title="if path not taken" >I</span>if (this._palette.length === 0) {
<span class="cstat-no" title="statement not covered" > this.error(new Error("Transparency chunk must be after palette"));</span>
<span class="cstat-no" title="statement not covered" > return;</span>
}
<span class="missing-if-branch" title="if path not taken" >I</span>if (data.length &gt; this._palette.length) {
<span class="cstat-no" title="statement not covered" > this.error(new Error("More transparent colors than palette size"));</span>
<span class="cstat-no" title="statement not covered" > return;</span>
}
for (let i = 0; i &lt; data.length; i++) {
this._palette[i][3] = data[i];
}
this.palette(this._palette);
}
&nbsp;
// for colorType 0 (grayscale) and 2 (rgb)
// there might be one gray/color defined as transparent
if (this._colorType === constants.COLORTYPE_GRAYSCALE) {
// grey, 2 bytes
this.transColor([data.readUInt16BE(0)]);
}
if (this._colorType === constants.COLORTYPE_COLOR) {
this.transColor([
data.readUInt16BE(0),
data.readUInt16BE(2),
data.readUInt16BE(4),
]);
}
&nbsp;
this._handleChunkEnd();
};
&nbsp;
Parser.prototype._handleGAMA = function (length) {
this.read(length, this._parseGAMA.bind(this));
};
Parser.prototype._parseGAMA = function (data) {
this._crc.write(data);
this.gamma(data.readUInt32BE(0) / constants.GAMMA_DIVISION);
&nbsp;
this._handleChunkEnd();
};
&nbsp;
Parser.prototype._handleIDAT = function (length) {
if (!this._emittedHeadersFinished) {
this._emittedHeadersFinished = true;
this.headersFinished();
}
this.read(-length, this._parseIDAT.bind(this, length));
};
Parser.prototype._parseIDAT = function (length, data) {
this._crc.write(data);
&nbsp;
<span class="missing-if-branch" title="if path not taken" >I</span>if (
this._colorType === constants.COLORTYPE_PALETTE_COLOR &amp;&amp;
this._palette.length === 0
) {
<span class="cstat-no" title="statement not covered" > throw new Error("Expected palette not found");</span>
}
&nbsp;
this.inflateData(data);
let leftOverLength = length - data.length;
&nbsp;
if (leftOverLength &gt; 0) {
this._handleIDAT(leftOverLength);
} else {
this._handleChunkEnd();
}
};
&nbsp;
Parser.prototype._handleIEND = function (length) {
this.read(length, this._parseIEND.bind(this));
};
Parser.prototype._parseIEND = function (data) {
this._crc.write(data);
&nbsp;
this._hasIEND = true;
this._handleChunkEnd();
&nbsp;
if (this.finished) {
this.finished();
}
};
&nbsp;</pre></td></tr></table></pre>
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