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<html lang="en">
<head>
<title>Code coverage report for lib\parser.js</title>
<meta charset="utf-8">
<link rel="stylesheet" href="../prettify.css">
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<div class="header high">
<h1>Code coverage report for <span class="entity">lib\parser.js</span></h1>
<h2>
Statements: <span class="metric">90.34% <small>(159 / 176)</small></span> &nbsp;&nbsp;&nbsp;&nbsp;
Branches: <span class="metric">86.11% <small>(62 / 72)</small></span> &nbsp;&nbsp;&nbsp;&nbsp;
Functions: <span class="metric">100% <small>(20 / 20)</small></span> &nbsp;&nbsp;&nbsp;&nbsp;
Lines: <span class="metric">90.34% <small>(159 / 176)</small></span> &nbsp;&nbsp;&nbsp;&nbsp;
Ignored: <span class="metric"><span class="ignore-none">none</span></span> &nbsp;&nbsp;&nbsp;&nbsp;
</h2>
<div class="path"><a href="../index.html">All files</a> &#187; <a href="index.html">lib/</a> &#187; parser.js</div>
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<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">// Copyright (c) 2012 Kuba Niegowski
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
&nbsp;
'use strict';
&nbsp;
&nbsp;
var constants = require('./constants'),
CrcCalculator = require('./crc');
&nbsp;
&nbsp;
var Parser = module.exports = function(options, dependencies) {
&nbsp;
this._options = options;
options.checkCRC = options.checkCRC !== false;
&nbsp;
this._hasIHDR = false;
this._hasIEND = 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.parsed = dependencies.parsed;
this.createData = dependencies.createData;
this.inflateData = dependencies.inflateData;
this.finished = dependencies.finished;
};
&nbsp;
var colorTypeToBppMap = {
0: 1,
2: 3,
3: 1,
4: 2,
6: 4
};
&nbsp;
Parser.prototype.start = function() {
this.read(constants.PNG_SIGNATURE.length,
this._parseSignature.bind(this)
);
};
&nbsp;
Parser.prototype._parseSignature = function(data) {
&nbsp;
var signature = constants.PNG_SIGNATURE;
&nbsp;
for (var 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) {
&nbsp;
// chunk content length
var length = data.readUInt32BE(0);
&nbsp;
// chunk type
var type = data.readUInt32BE(4),
name = '';
for (var i = 4; i &lt; 8; i++) {
name += String.fromCharCode(data[i]);
}
&nbsp;
//console.log('chunk ', name, length);
&nbsp;
// chunk flags
var ancillary = !!(data[4] &amp; 0x20), // or critical
priv = !!(data[5] &amp; 0x20), // or public
safeToCopy = !!(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(new Buffer(name));
&nbsp;
if (this._chunks[type]) {
return this._chunks[type](length);
&nbsp;
} else <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>
} else {
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) {
&nbsp;
var fileCrc = data.readInt32BE(0),
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) {
&nbsp;
this._crc.write(data);
&nbsp;
var width = data.readUInt32BE(0),
height = data.readUInt32BE(4),
depth = data[8],
colorType = data[9], // bits: 1 palette, 2 color, 4 alpha
compr = data[10],
filter = data[11],
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 colorTypeToBppMap)) {
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;
var bpp = colorTypeToBppMap[this._colorType];
this.createData(width, height, bpp, depth, interlace);
&nbsp;
this._hasIHDR = true;
&nbsp;
this.metadata({
width: width,
height: height,
depth: depth,
interlace: interlace,
palette: !!(colorType &amp; constants.COLOR_PALETTE),
color: !!(colorType &amp; constants.COLOR_COLOR),
alpha: !!(colorType &amp; constants.COLOR_ALPHA)
});
&nbsp;
this._handleChunkEnd();
};
&nbsp;
&nbsp;
Parser.prototype._handlePLTE = function(length) {
this.read(length, this._parsePLTE.bind(this));
};
Parser.prototype._parsePLTE = function(data) {
&nbsp;
this._crc.write(data);
&nbsp;
var entries = Math.floor(data.length / 3);
// console.log('Palette:', entries);
&nbsp;
for (var i = 0; i &lt; entries; i++) {
this._palette.push([
data.readUInt8(i * 3),
data.readUInt8(i * 3 + 1),
data.readUInt8(i * 3 + 2 ),
0xff
]);
}
&nbsp;
this._handleChunkEnd();
};
&nbsp;
Parser.prototype._handleTRNS = function(length) {
this.read(length, this._parseTRNS.bind(this));
};
Parser.prototype._parseTRNS = function(data) {
&nbsp;
this._crc.write(data);
&nbsp;
// palette
if (this._colorType == 3) {
<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 (var i = 0; i &lt; this._palette.length; i++) {
this._palette[i][3] = i &lt; data.length ? data.readUInt8(i) : 0xff;
}
}
&nbsp;
// for colorType 0 (grayscale) and 2 (rgb)
// there might be one gray/color defined as transparent
if (this._colorType === 0) {
// grey, 2 bytes
this._transColor = [data.readUInt16BE(0)];
}
if (this._colorType === 2) {
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) {
&nbsp;
this._crc.write(data);
this.gamma(data.readUInt32BE(0) / 100000);
&nbsp;
this._handleChunkEnd();
};
&nbsp;
Parser.prototype._handleIDAT = function(length) {
this.read(-length, this._parseIDAT.bind(this, length));
};
Parser.prototype._parseIDAT = function(length, data) {
&nbsp;
this._crc.write(data);
&nbsp;
<span class="missing-if-branch" title="if path not taken" >I</span>if (this._colorType == 3 &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);
length -= data.length;
&nbsp;
<span class="missing-if-branch" title="if path not taken" >I</span>if (length &gt; 0)
<span class="cstat-no" title="statement not covered" > this._handleIDAT(length);</span>
else
this._handleChunkEnd();
};
&nbsp;
&nbsp;
Parser.prototype._handleIEND = function(length) {
this.read(length, this._parseIEND.bind(this));
};
Parser.prototype._parseIEND = function(data) {
&nbsp;
this._crc.write(data);
&nbsp;
this._hasIEND = true;
this._handleChunkEnd();
&nbsp;
this.finished();
};
&nbsp;
Parser.prototype.reverseFiltered = function(indata, depth, width, height) {
&nbsp;
var outdata = indata; // only different for 16 bits
&nbsp;
if (this._colorType == 3) { // paletted
//console.log("paletted");
// use values from palette
var pxLineLength = width &lt;&lt; 2;
&nbsp;
for (var y = 0; y &lt; height; y++) {
var pxRowPos = y * pxLineLength;
&nbsp;
for (var x = 0; x &lt; width; x++) {
var pxPos = pxRowPos + (x &lt;&lt; 2),
color = this._palette[indata[pxPos]];
&nbsp;
<span class="missing-if-branch" title="if path not taken" >I</span>if (!color) {
<span class="cstat-no" title="statement not covered" > throw new Error("index " + indata[pxPos] + " not in palette");</span>
}
&nbsp;
for (var i = 0; i &lt; 4; i++)
indata[pxPos + i] = color[i];
}
}
} else {
var pxLineLength = width &lt;&lt; 2;
&nbsp;
if (this._transColor) {
for (var y = 0; y &lt; height; y++) {
var pxRowPos = y * pxLineLength;
&nbsp;
for (var x = 0; x &lt; width; x++) {
var pxPos = pxRowPos + (x &lt;&lt; 2);
var makeTrans = false;
//console.log(pxPos);
if (this._transColor.length === 1) {
if (this._transColor[0] === indata[pxPos]) {
makeTrans = true;
}
} else if (this._transColor[0] === indata[pxPos] &amp;&amp; this._transColor[1] === indata[pxPos + 1] &amp;&amp; this._transColor[2] === indata[pxPos + 2]) {
makeTrans = true;
}
if (makeTrans) {
for (var i = 0; i &lt; 4; i++) {
indata[pxPos + i] = 0;
}
}
}
}
}
if (depth !== 8) {
if (depth === 16) {
outdata = new Buffer(width * height * 4);
}
//console.log("adjusting");
var maxOutSample = 255;
var maxInSample = Math.pow(2, depth) - 1;
&nbsp;
for (var y = 0; y &lt; height; y++) {
var pxRowPos = y * pxLineLength;
&nbsp;
for (var x = 0; x &lt; width; x++) {
var pxPos = pxRowPos + (x &lt;&lt; 2);
for (var i = 0; i &lt; 4; i++)
outdata[pxPos + i] = Math.floor((indata[pxPos + i] * maxOutSample) / maxInSample + 0.5);
}
}
}
}
return outdata;
};
&nbsp;
&nbsp;</pre></td></tr>
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