feat: 초기 프로젝트 설정 및 룰.md 파일 추가

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2025-07-28 09:53:31 +09:00
commit 09a4d38512
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<!doctype html>
<html lang="en">
<head>
<title>Code coverage report for bitmapper.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);
}
</style>
</head>
<body>
<div class='wrapper'>
<div class='pad1'>
<h1><a href="index.html">All files</a> bitmapper.js</h1>
<div class='clearfix'>
<div class='fl pad1y space-right2'>
<span class="strong">94.37% </span>
<span class="quiet">Statements</span>
<span class='fraction'>134/142</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">72.41% </span>
<span class="quiet">Branches</span>
<span class='fraction'>21/29</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">89.47% </span>
<span class="quiet">Functions</span>
<span class='fraction'>17/19</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">94.16% </span>
<span class="quiet">Lines</span>
<span class='fraction'>129/137</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">
<tr><td class="line-count quiet"><a name='L1'></a><a href='#L1'>1</a>
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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 interlaceUtils = require("./interlace");
&nbsp;
let pixelBppMapper = [
// 0 - dummy entry
<span class="fstat-no" title="function not covered" > fu</span>nction () {},
&nbsp;
// 1 - L
// 0: 0, 1: 0, 2: 0, 3: 0xff
function (pxData, data, pxPos, rawPos) {
<span class="missing-if-branch" title="if path not taken" >I</span>if (rawPos === data.length) {
<span class="cstat-no" title="statement not covered" > throw new Error("Ran out of data");</span>
}
&nbsp;
let pixel = data[rawPos];
pxData[pxPos] = pixel;
pxData[pxPos + 1] = pixel;
pxData[pxPos + 2] = pixel;
pxData[pxPos + 3] = 0xff;
},
&nbsp;
// 2 - LA
// 0: 0, 1: 0, 2: 0, 3: 1
function (pxData, data, pxPos, rawPos) {
<span class="missing-if-branch" title="if path not taken" >I</span>if (rawPos + 1 &gt;= data.length) {
<span class="cstat-no" title="statement not covered" > throw new Error("Ran out of data");</span>
}
&nbsp;
let pixel = data[rawPos];
pxData[pxPos] = pixel;
pxData[pxPos + 1] = pixel;
pxData[pxPos + 2] = pixel;
pxData[pxPos + 3] = data[rawPos + 1];
},
&nbsp;
// 3 - RGB
// 0: 0, 1: 1, 2: 2, 3: 0xff
function (pxData, data, pxPos, rawPos) {
<span class="missing-if-branch" title="if path not taken" >I</span>if (rawPos + 2 &gt;= data.length) {
<span class="cstat-no" title="statement not covered" > throw new Error("Ran out of data");</span>
}
&nbsp;
pxData[pxPos] = data[rawPos];
pxData[pxPos + 1] = data[rawPos + 1];
pxData[pxPos + 2] = data[rawPos + 2];
pxData[pxPos + 3] = 0xff;
},
&nbsp;
// 4 - RGBA
// 0: 0, 1: 1, 2: 2, 3: 3
function (pxData, data, pxPos, rawPos) {
<span class="missing-if-branch" title="if path not taken" >I</span>if (rawPos + 3 &gt;= data.length) {
<span class="cstat-no" title="statement not covered" > throw new Error("Ran out of data");</span>
}
&nbsp;
pxData[pxPos] = data[rawPos];
pxData[pxPos + 1] = data[rawPos + 1];
pxData[pxPos + 2] = data[rawPos + 2];
pxData[pxPos + 3] = data[rawPos + 3];
},
];
&nbsp;
let pixelBppCustomMapper = [
// 0 - dummy entry
<span class="fstat-no" title="function not covered" > fu</span>nction () {},
&nbsp;
// 1 - L
// 0: 0, 1: 0, 2: 0, 3: 0xff
function (pxData, pixelData, pxPos, maxBit) {
let pixel = pixelData[0];
pxData[pxPos] = pixel;
pxData[pxPos + 1] = pixel;
pxData[pxPos + 2] = pixel;
pxData[pxPos + 3] = maxBit;
},
&nbsp;
// 2 - LA
// 0: 0, 1: 0, 2: 0, 3: 1
function (pxData, pixelData, pxPos) {
let pixel = pixelData[0];
pxData[pxPos] = pixel;
pxData[pxPos + 1] = pixel;
pxData[pxPos + 2] = pixel;
pxData[pxPos + 3] = pixelData[1];
},
&nbsp;
// 3 - RGB
// 0: 0, 1: 1, 2: 2, 3: 0xff
function (pxData, pixelData, pxPos, maxBit) {
pxData[pxPos] = pixelData[0];
pxData[pxPos + 1] = pixelData[1];
pxData[pxPos + 2] = pixelData[2];
pxData[pxPos + 3] = maxBit;
},
&nbsp;
// 4 - RGBA
// 0: 0, 1: 1, 2: 2, 3: 3
function (pxData, pixelData, pxPos) {
pxData[pxPos] = pixelData[0];
pxData[pxPos + 1] = pixelData[1];
pxData[pxPos + 2] = pixelData[2];
pxData[pxPos + 3] = pixelData[3];
},
];
&nbsp;
function bitRetriever(data, depth) {
let leftOver = [];
let i = 0;
&nbsp;
function split() {
<span class="missing-if-branch" title="if path not taken" >I</span>if (i === data.length) {
<span class="cstat-no" title="statement not covered" > throw new Error("Ran out of data");</span>
}
let byte = data[i];
i++;
let byte8, byte7, byte6, byte5, byte4, byte3, byte2, byte1;
switch (depth) {
<span class="branch-0 cbranch-no" title="branch not covered" > default:</span>
<span class="cstat-no" title="statement not covered" > throw new Error("unrecognised depth");</span>
case 16:
byte2 = data[i];
i++;
leftOver.push((byte &lt;&lt; 8) + byte2);
break;
case 4:
byte2 = byte &amp; 0x0f;
byte1 = byte &gt;&gt; 4;
leftOver.push(byte1, byte2);
break;
case 2:
byte4 = byte &amp; 3;
byte3 = (byte &gt;&gt; 2) &amp; 3;
byte2 = (byte &gt;&gt; 4) &amp; 3;
byte1 = (byte &gt;&gt; 6) &amp; 3;
leftOver.push(byte1, byte2, byte3, byte4);
break;
case 1:
byte8 = byte &amp; 1;
byte7 = (byte &gt;&gt; 1) &amp; 1;
byte6 = (byte &gt;&gt; 2) &amp; 1;
byte5 = (byte &gt;&gt; 3) &amp; 1;
byte4 = (byte &gt;&gt; 4) &amp; 1;
byte3 = (byte &gt;&gt; 5) &amp; 1;
byte2 = (byte &gt;&gt; 6) &amp; 1;
byte1 = (byte &gt;&gt; 7) &amp; 1;
leftOver.push(byte1, byte2, byte3, byte4, byte5, byte6, byte7, byte8);
break;
}
}
&nbsp;
return {
get: function (count) {
while (leftOver.length &lt; count) {
split();
}
let returner = leftOver.slice(0, count);
leftOver = leftOver.slice(count);
return returner;
},
resetAfterLine: function () {
leftOver.length = 0;
},
end: function () {
<span class="missing-if-branch" title="if path not taken" >I</span>if (i !== data.length) {
<span class="cstat-no" title="statement not covered" > throw new Error("extra data found");</span>
}
},
};
}
&nbsp;
function mapImage8Bit(image, pxData, getPxPos, bpp, data, rawPos) {
// eslint-disable-line max-params
let imageWidth = image.width;
let imageHeight = image.height;
let imagePass = image.index;
for (let y = 0; y &lt; imageHeight; y++) {
for (let x = 0; x &lt; imageWidth; x++) {
let pxPos = getPxPos(x, y, imagePass);
pixelBppMapper[bpp](pxData, data, pxPos, rawPos);
rawPos += bpp; //eslint-disable-line no-param-reassign
}
}
return rawPos;
}
&nbsp;
function mapImageCustomBit(image, pxData, getPxPos, bpp, bits, maxBit) {
// eslint-disable-line max-params
let imageWidth = image.width;
let imageHeight = image.height;
let imagePass = image.index;
for (let y = 0; y &lt; imageHeight; y++) {
for (let x = 0; x &lt; imageWidth; x++) {
let pixelData = bits.get(bpp);
let pxPos = getPxPos(x, y, imagePass);
pixelBppCustomMapper[bpp](pxData, pixelData, pxPos, maxBit);
}
bits.resetAfterLine();
}
}
&nbsp;
exports.dataToBitMap = function (data, bitmapInfo) {
let width = bitmapInfo.width;
let height = bitmapInfo.height;
let depth = bitmapInfo.depth;
let bpp = bitmapInfo.bpp;
let interlace = bitmapInfo.interlace;
let bits;
&nbsp;
if (depth !== 8) {
bits = bitRetriever(data, depth);
}
let pxData;
if (depth &lt;= 8) {
pxData = Buffer.alloc(width * height * 4);
} else {
pxData = new Uint16Array(width * height * 4);
}
let maxBit = Math.pow(2, depth) - 1;
let rawPos = 0;
let images;
let getPxPos;
&nbsp;
if (interlace) {
images = interlaceUtils.getImagePasses(width, height);
getPxPos = interlaceUtils.getInterlaceIterator(width, height);
} else {
let nonInterlacedPxPos = 0;
getPxPos = function () {
let returner = nonInterlacedPxPos;
nonInterlacedPxPos += 4;
return returner;
};
images = [{ width: width, height: height }];
}
&nbsp;
for (let imageIndex = 0; imageIndex &lt; images.length; imageIndex++) {
if (depth === 8) {
rawPos = mapImage8Bit(
images[imageIndex],
pxData,
getPxPos,
bpp,
data,
rawPos
);
} else {
mapImageCustomBit(
images[imageIndex],
pxData,
getPxPos,
bpp,
bits,
maxBit
);
}
}
if (depth === 8) {
<span class="missing-if-branch" title="if path not taken" >I</span>if (rawPos !== data.length) {
<span class="cstat-no" title="statement not covered" > throw new Error("extra data found");</span>
}
} else {
bits.end();
}
&nbsp;
return pxData;
};
&nbsp;</pre></td></tr></table></pre>
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<span class="strong">6.12% </span>
<span class="quiet">Branches</span>
<span class='fraction'>3/49</span>
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<span class='fraction'>2/3</span>
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<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");
&nbsp;
module.exports = function (dataIn, width, height, options) {
let outHasAlpha =
[constants.COLORTYPE_COLOR_ALPHA, constants.COLORTYPE_ALPHA].indexOf(
options.colorType
) !== -1;
<span class="missing-if-branch" title="else path not taken" >E</span>if (options.colorType === options.inputColorType) {
let bigEndian = (function () {
let buffer = new ArrayBuffer(2);
new DataView(buffer).setInt16(0, 256, true /* littleEndian */);
// Int16Array uses the platform's endianness.
return new Int16Array(buffer)[0] !== 256;
})();
// If no need to convert to grayscale and alpha is present/absent in both, take a fast route
<span class="missing-if-branch" title="else path not taken" >E</span>if (options.bitDepth === 8 || (<span class="branch-1 cbranch-no" title="branch not covered" >options.bitDepth === 16 </span>&amp;&amp; <span class="branch-2 cbranch-no" title="branch not covered" >bigEndian)</span>) {
return dataIn;
}
}
&nbsp;
// map to a UInt16 array if data is 16bit, fix endianness below
let data = <span class="cstat-no" title="statement not covered" >options.bitDepth !== 16 ? dataIn : new Uint16Array(dataIn.buffer);</span>
&nbsp;
let maxValue = <span class="cstat-no" title="statement not covered" >255;</span>
let inBpp = <span class="cstat-no" title="statement not covered" >constants.COLORTYPE_TO_BPP_MAP[options.inputColorType];</span>
<span class="cstat-no" title="statement not covered" > if (inBpp === 4 &amp;&amp; !options.inputHasAlpha) {</span>
<span class="cstat-no" title="statement not covered" > inBpp = 3;</span>
}
let outBpp = <span class="cstat-no" title="statement not covered" >constants.COLORTYPE_TO_BPP_MAP[options.colorType];</span>
<span class="cstat-no" title="statement not covered" > if (options.bitDepth === 16) {</span>
<span class="cstat-no" title="statement not covered" > maxValue = 65535;</span>
<span class="cstat-no" title="statement not covered" > outBpp *= 2;</span>
}
let outData = <span class="cstat-no" title="statement not covered" >Buffer.alloc(width * height * outBpp);</span>
&nbsp;
let inIndex = <span class="cstat-no" title="statement not covered" >0;</span>
let outIndex = <span class="cstat-no" title="statement not covered" >0;</span>
&nbsp;
let bgColor = <span class="cstat-no" title="statement not covered" >options.bgColor || {};</span>
<span class="cstat-no" title="statement not covered" > if (bgColor.red === undefined) {</span>
<span class="cstat-no" title="statement not covered" > bgColor.red = maxValue;</span>
}
<span class="cstat-no" title="statement not covered" > if (bgColor.green === undefined) {</span>
<span class="cstat-no" title="statement not covered" > bgColor.green = maxValue;</span>
}
<span class="cstat-no" title="statement not covered" > if (bgColor.blue === undefined) {</span>
<span class="cstat-no" title="statement not covered" > bgColor.blue = maxValue;</span>
}
&nbsp;
function <span class="fstat-no" title="function not covered" >getRGBA(</span>) {
let red;
let green;
let blue;
let alpha = <span class="cstat-no" title="statement not covered" >maxValue;</span>
<span class="cstat-no" title="statement not covered" > switch (options.inputColorType) {</span>
case constants.COLORTYPE_COLOR_ALPHA:
<span class="cstat-no" title="statement not covered" > alpha = data[inIndex + 3];</span>
<span class="cstat-no" title="statement not covered" > red = data[inIndex];</span>
<span class="cstat-no" title="statement not covered" > green = data[inIndex + 1];</span>
<span class="cstat-no" title="statement not covered" > blue = data[inIndex + 2];</span>
<span class="cstat-no" title="statement not covered" > break;</span>
case constants.COLORTYPE_COLOR:
<span class="cstat-no" title="statement not covered" > red = data[inIndex];</span>
<span class="cstat-no" title="statement not covered" > green = data[inIndex + 1];</span>
<span class="cstat-no" title="statement not covered" > blue = data[inIndex + 2];</span>
<span class="cstat-no" title="statement not covered" > break;</span>
case constants.COLORTYPE_ALPHA:
<span class="cstat-no" title="statement not covered" > alpha = data[inIndex + 1];</span>
<span class="cstat-no" title="statement not covered" > red = data[inIndex];</span>
<span class="cstat-no" title="statement not covered" > green = red;</span>
<span class="cstat-no" title="statement not covered" > blue = red;</span>
<span class="cstat-no" title="statement not covered" > break;</span>
case constants.COLORTYPE_GRAYSCALE:
<span class="cstat-no" title="statement not covered" > red = data[inIndex];</span>
<span class="cstat-no" title="statement not covered" > green = red;</span>
<span class="cstat-no" title="statement not covered" > blue = red;</span>
<span class="cstat-no" title="statement not covered" > break;</span>
default:
<span class="cstat-no" title="statement not covered" > throw new Error(</span>
"input color type:" +
options.inputColorType +
" is not supported at present"
);
}
&nbsp;
<span class="cstat-no" title="statement not covered" > if (options.inputHasAlpha) {</span>
<span class="cstat-no" title="statement not covered" > if (!outHasAlpha) {</span>
<span class="cstat-no" title="statement not covered" > alpha /= maxValue;</span>
<span class="cstat-no" title="statement not covered" > red = Math.min(</span>
Math.max(Math.round((1 - alpha) * bgColor.red + alpha * red), 0),
maxValue
);
<span class="cstat-no" title="statement not covered" > green = Math.min(</span>
Math.max(Math.round((1 - alpha) * bgColor.green + alpha * green), 0),
maxValue
);
<span class="cstat-no" title="statement not covered" > blue = Math.min(</span>
Math.max(Math.round((1 - alpha) * bgColor.blue + alpha * blue), 0),
maxValue
);
}
}
<span class="cstat-no" title="statement not covered" > return { red: red, green: green, blue: blue, alpha: alpha };</span>
}
&nbsp;
<span class="cstat-no" title="statement not covered" > for (let y = <span class="cstat-no" title="statement not covered" >0;</span> y &lt; height; y++) {</span>
<span class="cstat-no" title="statement not covered" > for (let x = <span class="cstat-no" title="statement not covered" >0;</span> x &lt; width; x++) {</span>
let rgba = <span class="cstat-no" title="statement not covered" >getRGBA(data, inIndex);</span>
&nbsp;
<span class="cstat-no" title="statement not covered" > switch (options.colorType) {</span>
case constants.COLORTYPE_COLOR_ALPHA:
case constants.COLORTYPE_COLOR:
<span class="cstat-no" title="statement not covered" > if (options.bitDepth === 8) {</span>
<span class="cstat-no" title="statement not covered" > outData[outIndex] = rgba.red;</span>
<span class="cstat-no" title="statement not covered" > outData[outIndex + 1] = rgba.green;</span>
<span class="cstat-no" title="statement not covered" > outData[outIndex + 2] = rgba.blue;</span>
<span class="cstat-no" title="statement not covered" > if (outHasAlpha) {</span>
<span class="cstat-no" title="statement not covered" > outData[outIndex + 3] = rgba.alpha;</span>
}
} else {
<span class="cstat-no" title="statement not covered" > outData.writeUInt16BE(rgba.red, outIndex);</span>
<span class="cstat-no" title="statement not covered" > outData.writeUInt16BE(rgba.green, outIndex + 2);</span>
<span class="cstat-no" title="statement not covered" > outData.writeUInt16BE(rgba.blue, outIndex + 4);</span>
<span class="cstat-no" title="statement not covered" > if (outHasAlpha) {</span>
<span class="cstat-no" title="statement not covered" > outData.writeUInt16BE(rgba.alpha, outIndex + 6);</span>
}
}
<span class="cstat-no" title="statement not covered" > break;</span>
case constants.COLORTYPE_ALPHA:
case constants.COLORTYPE_GRAYSCALE: {
// Convert to grayscale and alpha
let grayscale = <span class="cstat-no" title="statement not covered" >(rgba.red + rgba.green + rgba.blue) / 3;</span>
<span class="cstat-no" title="statement not covered" > if (options.bitDepth === 8) {</span>
<span class="cstat-no" title="statement not covered" > outData[outIndex] = grayscale;</span>
<span class="cstat-no" title="statement not covered" > if (outHasAlpha) {</span>
<span class="cstat-no" title="statement not covered" > outData[outIndex + 1] = rgba.alpha;</span>
}
} else {
<span class="cstat-no" title="statement not covered" > outData.writeUInt16BE(grayscale, outIndex);</span>
<span class="cstat-no" title="statement not covered" > if (outHasAlpha) {</span>
<span class="cstat-no" title="statement not covered" > outData.writeUInt16BE(rgba.alpha, outIndex + 2);</span>
}
}
<span class="cstat-no" title="statement not covered" > break;</span>
}
default:
<span class="cstat-no" title="statement not covered" > throw new Error("unrecognised color Type " + options.colorType);</span>
}
&nbsp;
<span class="cstat-no" title="statement not covered" > inIndex += inBpp;</span>
<span class="cstat-no" title="statement not covered" > outIndex += outBpp;</span>
}
}
&nbsp;
<span class="cstat-no" title="statement not covered" > return outData;</span>
};
&nbsp;</pre></td></tr></table></pre>
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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 util = require("util");
let Stream = require("stream");
&nbsp;
let ChunkStream = (module.exports = function () {
Stream.call(this);
&nbsp;
this._buffers = [];
this._buffered = 0;
&nbsp;
this._reads = [];
this._paused = false;
&nbsp;
this._encoding = "utf8";
this.writable = true;
});
util.inherits(ChunkStream, Stream);
&nbsp;
ChunkStream.prototype.read = function (length, callback) {
this._reads.push({
length: Math.abs(length), // if length &lt; 0 then at most this length
allowLess: length &lt; 0,
func: callback,
});
&nbsp;
process.nextTick(
function () {
this._process();
&nbsp;
// its paused and there is not enought data then ask for more
<span class="missing-if-branch" title="if path not taken" >I</span>if (this._paused &amp;&amp; this._reads.length &gt; 0) {
<span class="cstat-no" title="statement not covered" > this._paused = false;</span>
&nbsp;
<span class="cstat-no" title="statement not covered" > this.emit("drain");</span>
}
}.bind(this)
);
};
&nbsp;
ChunkStream.prototype.write = function (data, encoding) {
<span class="missing-if-branch" title="if path not taken" >I</span>if (!this.writable) {
<span class="cstat-no" title="statement not covered" > this.emit("error", new Error("Stream not writable"));</span>
<span class="cstat-no" title="statement not covered" > return false;</span>
}
&nbsp;
let dataBuffer;
<span class="missing-if-branch" title="else path not taken" >E</span>if (Buffer.isBuffer(data)) {
dataBuffer = data;
} else {
<span class="cstat-no" title="statement not covered" > dataBuffer = Buffer.from(data, encoding || this._encoding);</span>
}
&nbsp;
this._buffers.push(dataBuffer);
this._buffered += dataBuffer.length;
&nbsp;
this._process();
&nbsp;
// ok if there are no more read requests
if (this._reads &amp;&amp; this._reads.length === 0) {
this._paused = true;
}
&nbsp;
return this.writable &amp;&amp; !this._paused;
};
&nbsp;
ChunkStream.prototype.end = function (data, encoding) {
<span class="missing-if-branch" title="if path not taken" >I</span>if (data) {
<span class="cstat-no" title="statement not covered" > this.write(data, encoding);</span>
}
&nbsp;
this.writable = false;
&nbsp;
// already destroyed
<span class="missing-if-branch" title="if path not taken" >I</span>if (!this._buffers) {
<span class="cstat-no" title="statement not covered" > return;</span>
}
&nbsp;
// enqueue or handle end
if (this._buffers.length === 0) {
this._end();
} else {
this._buffers.push(null);
this._process();
}
};
&nbsp;
ChunkStream.prototype.destroySoon = ChunkStream.prototype.end;
&nbsp;
ChunkStream.prototype._end = function () {
if (this._reads.length &gt; 0) {
this.emit("error", new Error("Unexpected end of input"));
}
&nbsp;
this.destroy();
};
&nbsp;
ChunkStream.prototype.destroy = function () {
<span class="missing-if-branch" title="if path not taken" >I</span>if (!this._buffers) {
<span class="cstat-no" title="statement not covered" > return;</span>
}
&nbsp;
this.writable = false;
this._reads = null;
this._buffers = null;
&nbsp;
this.emit("close");
};
&nbsp;
ChunkStream.prototype._processReadAllowingLess = function (read) {
// ok there is any data so that we can satisfy this request
this._reads.shift(); // == read
&nbsp;
// first we need to peek into first buffer
let smallerBuf = this._buffers[0];
&nbsp;
// ok there is more data than we need
if (smallerBuf.length &gt; read.length) {
this._buffered -= read.length;
this._buffers[0] = smallerBuf.slice(read.length);
&nbsp;
read.func.call(this, smallerBuf.slice(0, read.length));
} else {
// ok this is less than maximum length so use it all
this._buffered -= smallerBuf.length;
this._buffers.shift(); // == smallerBuf
&nbsp;
read.func.call(this, smallerBuf);
}
};
&nbsp;
ChunkStream.prototype._processRead = function (read) {
this._reads.shift(); // == read
&nbsp;
let pos = 0;
let count = 0;
let data = Buffer.alloc(read.length);
&nbsp;
// create buffer for all data
while (pos &lt; read.length) {
let buf = this._buffers[count++];
let len = Math.min(buf.length, read.length - pos);
&nbsp;
buf.copy(data, pos, 0, len);
pos += len;
&nbsp;
// last buffer wasn't used all so just slice it and leave
if (len !== buf.length) {
this._buffers[--count] = buf.slice(len);
}
}
&nbsp;
// remove all used buffers
if (count &gt; 0) {
this._buffers.splice(0, count);
}
&nbsp;
this._buffered -= read.length;
&nbsp;
read.func.call(this, data);
};
&nbsp;
ChunkStream.prototype._process = function () {
try {
// as long as there is any data and read requests
while (this._buffered &gt; 0 &amp;&amp; this._reads &amp;&amp; this._reads.length &gt; 0) {
let read = this._reads[0];
&nbsp;
// read any data (but no more than length)
if (read.allowLess) {
this._processReadAllowingLess(read);
} else if (this._buffered &gt;= read.length) {
// ok we can meet some expectations
&nbsp;
this._processRead(read);
} else {
// not enought data to satisfy first request in queue
// so we need to wait for more
break;
}
}
&nbsp;
if (this._buffers &amp;&amp; !this.writable) {
this._end();
}
} catch (ex) {
<span class="cstat-no" title="statement not covered" > this.emit("error", ex);</span>
}
};
&nbsp;</pre></td></tr></table></pre>
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<tr><td class="line-count quiet"><a name='L1'></a><a href='#L1'>1</a>
<a name='L2'></a><a href='#L2'>2</a>
<a name='L3'></a><a href='#L3'>3</a>
<a name='L4'></a><a href='#L4'>4</a>
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<a name='L10'></a><a href='#L10'>10</a>
<a name='L11'></a><a href='#L11'>11</a>
<a name='L12'></a><a href='#L12'>12</a>
<a name='L13'></a><a href='#L13'>13</a>
<a name='L14'></a><a href='#L14'>14</a>
<a name='L15'></a><a href='#L15'>15</a>
<a name='L16'></a><a href='#L16'>16</a>
<a name='L17'></a><a href='#L17'>17</a>
<a name='L18'></a><a href='#L18'>18</a>
<a name='L19'></a><a href='#L19'>19</a>
<a name='L20'></a><a href='#L20'>20</a>
<a name='L21'></a><a href='#L21'>21</a>
<a name='L22'></a><a href='#L22'>22</a>
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<a name='L29'></a><a href='#L29'>29</a>
<a name='L30'></a><a href='#L30'>30</a>
<a name='L31'></a><a href='#L31'>31</a>
<a name='L32'></a><a href='#L32'>32</a>
<a name='L33'></a><a href='#L33'>33</a></td><td class="line-coverage quiet"><span class="cline-any cline-neutral">&nbsp;</span>
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<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">"use strict";
&nbsp;
module.exports = {
PNG_SIGNATURE: [0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a],
&nbsp;
TYPE_IHDR: 0x49484452,
TYPE_IEND: 0x49454e44,
TYPE_IDAT: 0x49444154,
TYPE_PLTE: 0x504c5445,
TYPE_tRNS: 0x74524e53, // eslint-disable-line camelcase
TYPE_gAMA: 0x67414d41, // eslint-disable-line camelcase
&nbsp;
// color-type bits
COLORTYPE_GRAYSCALE: 0,
COLORTYPE_PALETTE: 1,
COLORTYPE_COLOR: 2,
COLORTYPE_ALPHA: 4, // e.g. grayscale and alpha
&nbsp;
// color-type combinations
COLORTYPE_PALETTE_COLOR: 3,
COLORTYPE_COLOR_ALPHA: 6,
&nbsp;
COLORTYPE_TO_BPP_MAP: {
0: 1,
2: 3,
3: 1,
4: 2,
6: 4,
},
&nbsp;
GAMMA_DIVISION: 100000,
};
&nbsp;</pre></td></tr></table></pre>
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at Fri Apr 10 2020 13:53:16 GMT+0200 (Central European Summer Time)
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<!doctype html>
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<head>
<title>Code coverage report for crc.js</title>
<meta charset="utf-8" />
<link rel="stylesheet" href="prettify.css" />
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<h1><a href="index.html">All files</a> crc.js</h1>
<div class='clearfix'>
<div class='fl pad1y space-right2'>
<span class="strong">100% </span>
<span class="quiet">Statements</span>
<span class='fraction'>26/26</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">100% </span>
<span class="quiet">Branches</span>
<span class='fraction'>2/2</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">100% </span>
<span class="quiet">Functions</span>
<span class='fraction'>5/5</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">100% </span>
<span class="quiet">Lines</span>
<span class='fraction'>22/22</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.
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<div class='status-line high'></div>
<pre><table class="coverage">
<tr><td class="line-count quiet"><a name='L1'></a><a href='#L1'>1</a>
<a name='L2'></a><a href='#L2'>2</a>
<a name='L3'></a><a href='#L3'>3</a>
<a name='L4'></a><a href='#L4'>4</a>
<a name='L5'></a><a href='#L5'>5</a>
<a name='L6'></a><a href='#L6'>6</a>
<a name='L7'></a><a href='#L7'>7</a>
<a name='L8'></a><a href='#L8'>8</a>
<a name='L9'></a><a href='#L9'>9</a>
<a name='L10'></a><a href='#L10'>10</a>
<a name='L11'></a><a href='#L11'>11</a>
<a name='L12'></a><a href='#L12'>12</a>
<a name='L13'></a><a href='#L13'>13</a>
<a name='L14'></a><a href='#L14'>14</a>
<a name='L15'></a><a href='#L15'>15</a>
<a name='L16'></a><a href='#L16'>16</a>
<a name='L17'></a><a href='#L17'>17</a>
<a name='L18'></a><a href='#L18'>18</a>
<a name='L19'></a><a href='#L19'>19</a>
<a name='L20'></a><a href='#L20'>20</a>
<a name='L21'></a><a href='#L21'>21</a>
<a name='L22'></a><a href='#L22'>22</a>
<a name='L23'></a><a href='#L23'>23</a>
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<a name='L25'></a><a href='#L25'>25</a>
<a name='L26'></a><a href='#L26'>26</a>
<a name='L27'></a><a href='#L27'>27</a>
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<a name='L36'></a><a href='#L36'>36</a>
<a name='L37'></a><a href='#L37'>37</a>
<a name='L38'></a><a href='#L38'>38</a>
<a name='L39'></a><a href='#L39'>39</a>
<a name='L40'></a><a href='#L40'>40</a>
<a name='L41'></a><a href='#L41'>41</a></td><td class="line-coverage quiet"><span class="cline-any cline-neutral">&nbsp;</span>
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<span class="cline-any cline-yes">256x</span>
<span class="cline-any cline-yes">256x</span>
<span class="cline-any cline-yes">2048x</span>
<span class="cline-any cline-yes">1024x</span>
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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 crcTable = [];
&nbsp;
(function () {
for (let i = 0; i &lt; 256; i++) {
let currentCrc = i;
for (let j = 0; j &lt; 8; j++) {
if (currentCrc &amp; 1) {
currentCrc = 0xedb88320 ^ (currentCrc &gt;&gt;&gt; 1);
} else {
currentCrc = currentCrc &gt;&gt;&gt; 1;
}
}
crcTable[i] = currentCrc;
}
})();
&nbsp;
let CrcCalculator = (module.exports = function () {
this._crc = -1;
});
&nbsp;
CrcCalculator.prototype.write = function (data) {
for (let i = 0; i &lt; data.length; i++) {
this._crc = crcTable[(this._crc ^ data[i]) &amp; 0xff] ^ (this._crc &gt;&gt;&gt; 8);
}
return true;
};
&nbsp;
CrcCalculator.prototype.crc32 = function () {
return this._crc ^ -1;
};
&nbsp;
CrcCalculator.crc32 = function (buf) {
let crc = -1;
for (let i = 0; i &lt; buf.length; i++) {
crc = crcTable[(crc ^ buf[i]) &amp; 0xff] ^ (crc &gt;&gt;&gt; 8);
}
return crc ^ -1;
};
&nbsp;</pre></td></tr></table></pre>
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at Fri Apr 10 2020 13:53:16 GMT+0200 (Central European Summer Time)
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<div class='clearfix'>
<div class='fl pad1y space-right2'>
<span class="strong">95.83% </span>
<span class="quiet">Statements</span>
<span class='fraction'>92/96</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">81.82% </span>
<span class="quiet">Branches</span>
<span class='fraction'>36/44</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">100% </span>
<span class="quiet">Functions</span>
<span class='fraction'>11/11</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">95.24% </span>
<span class="quiet">Lines</span>
<span class='fraction'>80/84</span>
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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.
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<pre><table class="coverage">
<tr><td class="line-count quiet"><a name='L1'></a><a href='#L1'>1</a>
<a name='L2'></a><a href='#L2'>2</a>
<a name='L3'></a><a href='#L3'>3</a>
<a name='L4'></a><a href='#L4'>4</a>
<a name='L5'></a><a href='#L5'>5</a>
<a name='L6'></a><a href='#L6'>6</a>
<a name='L7'></a><a href='#L7'>7</a>
<a name='L8'></a><a href='#L8'>8</a>
<a name='L9'></a><a href='#L9'>9</a>
<a name='L10'></a><a href='#L10'>10</a>
<a name='L11'></a><a href='#L11'>11</a>
<a name='L12'></a><a href='#L12'>12</a>
<a name='L13'></a><a href='#L13'>13</a>
<a name='L14'></a><a href='#L14'>14</a>
<a name='L15'></a><a href='#L15'>15</a>
<a name='L16'></a><a href='#L16'>16</a>
<a name='L17'></a><a href='#L17'>17</a>
<a name='L18'></a><a href='#L18'>18</a>
<a name='L19'></a><a href='#L19'>19</a>
<a name='L20'></a><a href='#L20'>20</a>
<a name='L21'></a><a href='#L21'>21</a>
<a name='L22'></a><a href='#L22'>22</a>
<a name='L23'></a><a href='#L23'>23</a>
<a name='L24'></a><a href='#L24'>24</a>
<a name='L25'></a><a href='#L25'>25</a>
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<a name='L27'></a><a href='#L27'>27</a>
<a name='L28'></a><a href='#L28'>28</a>
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<a name='L31'></a><a href='#L31'>31</a>
<a name='L32'></a><a href='#L32'>32</a>
<a name='L33'></a><a href='#L33'>33</a>
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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 paethPredictor = require("./paeth-predictor");
&nbsp;
function filterNone(pxData, pxPos, byteWidth, rawData, rawPos) {
for (let x = 0; x &lt; byteWidth; x++) {
rawData[rawPos + x] = pxData[pxPos + x];
}
}
&nbsp;
function filterSumNone(pxData, pxPos, byteWidth) {
let sum = 0;
let length = pxPos + byteWidth;
&nbsp;
for (let i = pxPos; i &lt; length; i++) {
sum += Math.abs(pxData[i]);
}
return sum;
}
&nbsp;
function filterSub(pxData, pxPos, byteWidth, rawData, rawPos, bpp) {
for (let x = 0; x &lt; byteWidth; x++) {
let left = x &gt;= bpp ? pxData[pxPos + x - bpp] : 0;
let val = pxData[pxPos + x] - left;
&nbsp;
rawData[rawPos + x] = val;
}
}
&nbsp;
function filterSumSub(pxData, pxPos, byteWidth, bpp) {
let sum = 0;
for (let x = 0; x &lt; byteWidth; x++) {
let left = x &gt;= bpp ? pxData[pxPos + x - bpp] : 0;
let val = pxData[pxPos + x] - left;
&nbsp;
sum += Math.abs(val);
}
&nbsp;
return sum;
}
&nbsp;
function filterUp(pxData, pxPos, byteWidth, rawData, rawPos) {
for (let x = 0; x &lt; byteWidth; x++) {
let up = pxPos &gt; 0 ? pxData[pxPos + x - byteWidth] : <span class="branch-1 cbranch-no" title="branch not covered" >0;</span>
let val = pxData[pxPos + x] - up;
&nbsp;
rawData[rawPos + x] = val;
}
}
&nbsp;
function filterSumUp(pxData, pxPos, byteWidth) {
let sum = 0;
let length = pxPos + byteWidth;
for (let x = pxPos; x &lt; length; x++) {
let up = pxPos &gt; 0 ? pxData[x - byteWidth] : 0;
let val = pxData[x] - up;
&nbsp;
sum += Math.abs(val);
}
&nbsp;
return sum;
}
&nbsp;
function filterAvg(pxData, pxPos, byteWidth, rawData, rawPos, bpp) {
for (let x = 0; x &lt; byteWidth; x++) {
let left = x &gt;= bpp ? pxData[pxPos + x - bpp] : 0;
let up = pxPos &gt; 0 ? pxData[pxPos + x - byteWidth] : <span class="branch-1 cbranch-no" title="branch not covered" >0;</span>
let val = pxData[pxPos + x] - ((left + up) &gt;&gt; 1);
&nbsp;
rawData[rawPos + x] = val;
}
}
&nbsp;
function filterSumAvg(pxData, pxPos, byteWidth, bpp) {
let sum = 0;
for (let x = 0; x &lt; byteWidth; x++) {
let left = x &gt;= bpp ? pxData[pxPos + x - bpp] : 0;
let up = pxPos &gt; 0 ? pxData[pxPos + x - byteWidth] : 0;
let val = pxData[pxPos + x] - ((left + up) &gt;&gt; 1);
&nbsp;
sum += Math.abs(val);
}
&nbsp;
return sum;
}
&nbsp;
function filterPaeth(pxData, pxPos, byteWidth, rawData, rawPos, bpp) {
for (let x = 0; x &lt; byteWidth; x++) {
let left = x &gt;= bpp ? pxData[pxPos + x - bpp] : 0;
let up = pxPos &gt; 0 ? pxData[pxPos + x - byteWidth] : <span class="branch-1 cbranch-no" title="branch not covered" >0;</span>
let upleft =
pxPos &gt; 0 &amp;&amp; x &gt;= bpp ? pxData[pxPos + x - (byteWidth + bpp)] : 0;
let val = pxData[pxPos + x] - paethPredictor(left, up, upleft);
&nbsp;
rawData[rawPos + x] = val;
}
}
&nbsp;
function filterSumPaeth(pxData, pxPos, byteWidth, bpp) {
let sum = 0;
for (let x = 0; x &lt; byteWidth; x++) {
let left = x &gt;= bpp ? pxData[pxPos + x - bpp] : 0;
let up = pxPos &gt; 0 ? pxData[pxPos + x - byteWidth] : 0;
let upleft =
pxPos &gt; 0 &amp;&amp; x &gt;= bpp ? pxData[pxPos + x - (byteWidth + bpp)] : 0;
let val = pxData[pxPos + x] - paethPredictor(left, up, upleft);
&nbsp;
sum += Math.abs(val);
}
&nbsp;
return sum;
}
&nbsp;
let filters = {
0: filterNone,
1: filterSub,
2: filterUp,
3: filterAvg,
4: filterPaeth,
};
&nbsp;
let filterSums = {
0: filterSumNone,
1: filterSumSub,
2: filterSumUp,
3: filterSumAvg,
4: filterSumPaeth,
};
&nbsp;
module.exports = function (pxData, width, height, options, bpp) {
let filterTypes;
<span class="missing-if-branch" title="else path not taken" >E</span>if (!("filterType" in options) || options.filterType === -1) {
filterTypes = [0, 1, 2, 3, 4];
} else <span class="cstat-no" title="statement not covered" >if (typeof options.filterType === "number") {</span>
<span class="cstat-no" title="statement not covered" > filterTypes = [options.filterType];</span>
} else {
<span class="cstat-no" title="statement not covered" > throw new Error("unrecognised filter types");</span>
}
&nbsp;
<span class="missing-if-branch" title="if path not taken" >I</span>if (options.bitDepth === 16) {
<span class="cstat-no" title="statement not covered" > bpp *= 2;</span>
}
let byteWidth = width * bpp;
let rawPos = 0;
let pxPos = 0;
let rawData = Buffer.alloc((byteWidth + 1) * height);
&nbsp;
let sel = filterTypes[0];
&nbsp;
for (let y = 0; y &lt; height; y++) {
<span class="missing-if-branch" title="else path not taken" >E</span>if (filterTypes.length &gt; 1) {
// find best filter for this line (with lowest sum of values)
let min = Infinity;
&nbsp;
for (let i = 0; i &lt; filterTypes.length; i++) {
let sum = filterSums[filterTypes[i]](pxData, pxPos, byteWidth, bpp);
if (sum &lt; min) {
sel = filterTypes[i];
min = sum;
}
}
}
&nbsp;
rawData[rawPos] = sel;
rawPos++;
filters[sel](pxData, pxPos, byteWidth, rawData, rawPos, bpp);
rawPos += byteWidth;
pxPos += byteWidth;
}
return rawData;
};
&nbsp;</pre></td></tr></table></pre>
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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 util = require("util");
let ChunkStream = require("./chunkstream");
let Filter = require("./filter-parse");
&nbsp;
let FilterAsync = (module.exports = function (bitmapInfo) {
ChunkStream.call(this);
&nbsp;
let buffers = [];
let that = this;
this._filter = new Filter(bitmapInfo, {
read: this.read.bind(this),
write: function (buffer) {
buffers.push(buffer);
},
complete: function () {
that.emit("complete", Buffer.concat(buffers));
},
});
&nbsp;
this._filter.start();
});
util.inherits(FilterAsync, ChunkStream);
&nbsp;</pre></td></tr></table></pre>
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<h1><a href="index.html">All files</a> filter-parse-sync.js</h1>
<div class='clearfix'>
<div class='fl pad1y space-right2'>
<span class="strong">100% </span>
<span class="quiet">Statements</span>
<span class='fraction'>10/10</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">100% </span>
<span class="quiet">Branches</span>
<span class='fraction'>0/0</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">100% </span>
<span class="quiet">Functions</span>
<span class='fraction'>3/3</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">100% </span>
<span class="quiet">Lines</span>
<span class='fraction'>10/10</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>
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<div class='status-line high'></div>
<pre><table class="coverage">
<tr><td class="line-count quiet"><a name='L1'></a><a href='#L1'>1</a>
<a name='L2'></a><a href='#L2'>2</a>
<a name='L3'></a><a href='#L3'>3</a>
<a name='L4'></a><a href='#L4'>4</a>
<a name='L5'></a><a href='#L5'>5</a>
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<a name='L7'></a><a href='#L7'>7</a>
<a name='L8'></a><a href='#L8'>8</a>
<a name='L9'></a><a href='#L9'>9</a>
<a name='L10'></a><a href='#L10'>10</a>
<a name='L11'></a><a href='#L11'>11</a>
<a name='L12'></a><a href='#L12'>12</a>
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<a name='L21'></a><a href='#L21'>21</a>
<a name='L22'></a><a href='#L22'>22</a></td><td class="line-coverage quiet"><span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-yes">1x</span>
<span class="cline-any cline-yes">1x</span>
<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-yes">1x</span>
<span class="cline-any cline-yes">162x</span>
<span class="cline-any cline-yes">162x</span>
<span class="cline-any cline-yes">162x</span>
<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-yes">6337x</span>
<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-yes">162x</span>
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<span class="cline-any cline-neutral">&nbsp;</span>
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<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">"use strict";
&nbsp;
let SyncReader = require("./sync-reader");
let Filter = require("./filter-parse");
&nbsp;
exports.process = function (inBuffer, bitmapInfo) {
let outBuffers = [];
let reader = new SyncReader(inBuffer);
let filter = new Filter(bitmapInfo, {
read: reader.read.bind(reader),
write: function (bufferPart) {
outBuffers.push(bufferPart);
},
complete: function () {},
});
&nbsp;
filter.start();
reader.process();
&nbsp;
return Buffer.concat(outBuffers);
};
&nbsp;</pre></td></tr></table></pre>
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<div class='clearfix'>
<div class='fl pad1y space-right2'>
<span class="strong">98.96% </span>
<span class="quiet">Statements</span>
<span class='fraction'>95/96</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">97.14% </span>
<span class="quiet">Branches</span>
<span class='fraction'>34/35</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">100% </span>
<span class="quiet">Functions</span>
<span class='fraction'>8/8</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">98.9% </span>
<span class="quiet">Lines</span>
<span class='fraction'>90/91</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.
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<div class='status-line high'></div>
<pre><table class="coverage">
<tr><td class="line-count quiet"><a name='L1'></a><a href='#L1'>1</a>
<a name='L2'></a><a href='#L2'>2</a>
<a name='L3'></a><a href='#L3'>3</a>
<a name='L4'></a><a href='#L4'>4</a>
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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 interlaceUtils = require("./interlace");
let paethPredictor = require("./paeth-predictor");
&nbsp;
function getByteWidth(width, bpp, depth) {
let byteWidth = width * bpp;
if (depth !== 8) {
byteWidth = Math.ceil(byteWidth / (8 / depth));
}
return byteWidth;
}
&nbsp;
let Filter = (module.exports = function (bitmapInfo, dependencies) {
let width = bitmapInfo.width;
let height = bitmapInfo.height;
let interlace = bitmapInfo.interlace;
let bpp = bitmapInfo.bpp;
let depth = bitmapInfo.depth;
&nbsp;
this.read = dependencies.read;
this.write = dependencies.write;
this.complete = dependencies.complete;
&nbsp;
this._imageIndex = 0;
this._images = [];
if (interlace) {
let passes = interlaceUtils.getImagePasses(width, height);
for (let i = 0; i &lt; passes.length; i++) {
this._images.push({
byteWidth: getByteWidth(passes[i].width, bpp, depth),
height: passes[i].height,
lineIndex: 0,
});
}
} else {
this._images.push({
byteWidth: getByteWidth(width, bpp, depth),
height: height,
lineIndex: 0,
});
}
&nbsp;
// when filtering the line we look at the pixel to the left
// the spec also says it is done on a byte level regardless of the number of pixels
// so if the depth is byte compatible (8 or 16) we subtract the bpp in order to compare back
// a pixel rather than just a different byte part. However if we are sub byte, we ignore.
if (depth === 8) {
this._xComparison = bpp;
} else if (depth === 16) {
this._xComparison = bpp * 2;
} else {
this._xComparison = 1;
}
});
&nbsp;
Filter.prototype.start = function () {
this.read(
this._images[this._imageIndex].byteWidth + 1,
this._reverseFilterLine.bind(this)
);
};
&nbsp;
Filter.prototype._unFilterType1 = function (
rawData,
unfilteredLine,
byteWidth
) {
let xComparison = this._xComparison;
let xBiggerThan = xComparison - 1;
&nbsp;
for (let x = 0; x &lt; byteWidth; x++) {
let rawByte = rawData[1 + x];
let f1Left = x &gt; xBiggerThan ? unfilteredLine[x - xComparison] : 0;
unfilteredLine[x] = rawByte + f1Left;
}
};
&nbsp;
Filter.prototype._unFilterType2 = function (
rawData,
unfilteredLine,
byteWidth
) {
let lastLine = this._lastLine;
&nbsp;
for (let x = 0; x &lt; byteWidth; x++) {
let rawByte = rawData[1 + x];
let f2Up = lastLine ? lastLine[x] : 0;
unfilteredLine[x] = rawByte + f2Up;
}
};
&nbsp;
Filter.prototype._unFilterType3 = function (
rawData,
unfilteredLine,
byteWidth
) {
let xComparison = this._xComparison;
let xBiggerThan = xComparison - 1;
let lastLine = this._lastLine;
&nbsp;
for (let x = 0; x &lt; byteWidth; x++) {
let rawByte = rawData[1 + x];
let f3Up = lastLine ? lastLine[x] : 0;
let f3Left = x &gt; xBiggerThan ? unfilteredLine[x - xComparison] : 0;
let f3Add = Math.floor((f3Left + f3Up) / 2);
unfilteredLine[x] = rawByte + f3Add;
}
};
&nbsp;
Filter.prototype._unFilterType4 = function (
rawData,
unfilteredLine,
byteWidth
) {
let xComparison = this._xComparison;
let xBiggerThan = xComparison - 1;
let lastLine = this._lastLine;
&nbsp;
for (let x = 0; x &lt; byteWidth; x++) {
let rawByte = rawData[1 + x];
let f4Up = lastLine ? lastLine[x] : 0;
let f4Left = x &gt; xBiggerThan ? unfilteredLine[x - xComparison] : 0;
let f4UpLeft = x &gt; xBiggerThan &amp;&amp; lastLine ? lastLine[x - xComparison] : 0;
let f4Add = paethPredictor(f4Left, f4Up, f4UpLeft);
unfilteredLine[x] = rawByte + f4Add;
}
};
&nbsp;
Filter.prototype._reverseFilterLine = function (rawData) {
let filter = rawData[0];
let unfilteredLine;
let currentImage = this._images[this._imageIndex];
let byteWidth = currentImage.byteWidth;
&nbsp;
if (filter === 0) {
unfilteredLine = rawData.slice(1, byteWidth + 1);
} else {
unfilteredLine = Buffer.alloc(byteWidth);
&nbsp;
switch (filter) {
case 1:
this._unFilterType1(rawData, unfilteredLine, byteWidth);
break;
case 2:
this._unFilterType2(rawData, unfilteredLine, byteWidth);
break;
case 3:
this._unFilterType3(rawData, unfilteredLine, byteWidth);
break;
case 4:
this._unFilterType4(rawData, unfilteredLine, byteWidth);
break;
<span class="branch-4 cbranch-no" title="branch not covered" > default:</span>
<span class="cstat-no" title="statement not covered" > throw new Error("Unrecognised filter type - " + filter);</span>
}
}
&nbsp;
this.write(unfilteredLine);
&nbsp;
currentImage.lineIndex++;
if (currentImage.lineIndex &gt;= currentImage.height) {
this._lastLine = null;
this._imageIndex++;
currentImage = this._images[this._imageIndex];
} else {
this._lastLine = unfilteredLine;
}
&nbsp;
if (currentImage) {
// read, using the byte width that may be from the new current image
this.read(currentImage.byteWidth + 1, this._reverseFilterLine.bind(this));
} else {
this._lastLine = null;
this.complete();
}
};
&nbsp;</pre></td></tr></table></pre>
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<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-yes">335x</span>
<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-yes">335x</span>
<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-yes">131x</span>
<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-yes">204x</span>
<span class="cline-any cline-yes">12x</span>
<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-yes">204x</span>
<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-yes">106x</span>
<span class="cline-any cline-yes">66x</span>
<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-yes">106x</span>
<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-yes">335x</span>
<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">"use strict";
&nbsp;
function dePalette(indata, outdata, width, height, palette) {
let pxPos = 0;
// use values from palette
for (let y = 0; y &lt; height; y++) {
for (let x = 0; x &lt; width; x++) {
let color = 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 (let i = 0; i &lt; 4; i++) {
outdata[pxPos + i] = color[i];
}
pxPos += 4;
}
}
}
&nbsp;
function replaceTransparentColor(indata, outdata, width, height, transColor) {
let pxPos = 0;
for (let y = 0; y &lt; height; y++) {
for (let x = 0; x &lt; width; x++) {
let makeTrans = false;
&nbsp;
if (transColor.length === 1) {
if (transColor[0] === indata[pxPos]) {
makeTrans = true;
}
} else if (
transColor[0] === indata[pxPos] &amp;&amp;
transColor[1] === indata[pxPos + 1] &amp;&amp;
transColor[2] === indata[pxPos + 2]
) {
makeTrans = true;
}
if (makeTrans) {
for (let i = 0; i &lt; 4; i++) {
outdata[pxPos + i] = 0;
}
}
pxPos += 4;
}
}
}
&nbsp;
function scaleDepth(indata, outdata, width, height, depth) {
let maxOutSample = 255;
let maxInSample = Math.pow(2, depth) - 1;
let pxPos = 0;
&nbsp;
for (let y = 0; y &lt; height; y++) {
for (let x = 0; x &lt; width; x++) {
for (let i = 0; i &lt; 4; i++) {
outdata[pxPos + i] = Math.floor(
(indata[pxPos + i] * maxOutSample) / maxInSample + 0.5
);
}
pxPos += 4;
}
}
}
&nbsp;
module.exports = function (indata, imageData) {
let depth = imageData.depth;
let width = imageData.width;
let height = imageData.height;
let colorType = imageData.colorType;
let transColor = imageData.transColor;
let palette = imageData.palette;
&nbsp;
let outdata = indata; // only different for 16 bits
&nbsp;
if (colorType === 3) {
// paletted
dePalette(indata, outdata, width, height, palette);
} else {
if (transColor) {
replaceTransparentColor(indata, outdata, width, height, transColor);
}
// if it needs scaling
if (depth !== 8) {
// if we need to change the buffer size
if (depth === 16) {
outdata = Buffer.alloc(width * height * 4);
}
scaleDepth(indata, outdata, width, height, depth);
}
}
return outdata;
};
&nbsp;</pre></td></tr></table></pre>
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<!doctype html>
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<head>
<title>Code coverage report for All files</title>
<meta charset="utf-8" />
<link rel="stylesheet" href="prettify.css" />
<link rel="stylesheet" href="base.css" />
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</head>
<body>
<div class='wrapper'>
<div class='pad1'>
<h1>All files</h1>
<div class='clearfix'>
<div class='fl pad1y space-right2'>
<span class="strong">82.72% </span>
<span class="quiet">Statements</span>
<span class='fraction'>1034/1250</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">67.59% </span>
<span class="quiet">Branches</span>
<span class='fraction'>317/469</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">90.26% </span>
<span class="quiet">Functions</span>
<span class='fraction'>139/154</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">82.53% </span>
<span class="quiet">Lines</span>
<span class='fraction'>992/1202</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>
<div class="pad1">
<table class="coverage-summary">
<thead>
<tr>
<th data-col="file" data-fmt="html" data-html="true" class="file">File</th>
<th data-col="pic" data-type="number" data-fmt="html" data-html="true" class="pic"></th>
<th data-col="statements" data-type="number" data-fmt="pct" class="pct">Statements</th>
<th data-col="statements_raw" data-type="number" data-fmt="html" class="abs"></th>
<th data-col="branches" data-type="number" data-fmt="pct" class="pct">Branches</th>
<th data-col="branches_raw" data-type="number" data-fmt="html" class="abs"></th>
<th data-col="functions" data-type="number" data-fmt="pct" class="pct">Functions</th>
<th data-col="functions_raw" data-type="number" data-fmt="html" class="abs"></th>
<th data-col="lines" data-type="number" data-fmt="pct" class="pct">Lines</th>
<th data-col="lines_raw" data-type="number" data-fmt="html" class="abs"></th>
</tr>
</thead>
<tbody><tr>
<td class="file high" data-value="bitmapper.js"><a href="bitmapper.js.html">bitmapper.js</a></td>
<td data-value="94.37" class="pic high">
<div class="chart"><div class="cover-fill" style="width: 94%"></div><div class="cover-empty" style="width: 6%"></div></div>
</td>
<td data-value="94.37" class="pct high">94.37%</td>
<td data-value="142" class="abs high">134/142</td>
<td data-value="72.41" class="pct medium">72.41%</td>
<td data-value="29" class="abs medium">21/29</td>
<td data-value="89.47" class="pct high">89.47%</td>
<td data-value="19" class="abs high">17/19</td>
<td data-value="94.16" class="pct high">94.16%</td>
<td data-value="137" class="abs high">129/137</td>
</tr>
<tr>
<td class="file low" data-value="bitpacker.js"><a href="bitpacker.js.html">bitpacker.js</a></td>
<td data-value="11.36" class="pic low">
<div class="chart"><div class="cover-fill" style="width: 11%"></div><div class="cover-empty" style="width: 89%"></div></div>
</td>
<td data-value="11.36" class="pct low">11.36%</td>
<td data-value="88" class="abs low">10/88</td>
<td data-value="6.12" class="pct low">6.12%</td>
<td data-value="49" class="abs low">3/49</td>
<td data-value="66.67" class="pct medium">66.67%</td>
<td data-value="3" class="abs medium">2/3</td>
<td data-value="11.63" class="pct low">11.63%</td>
<td data-value="86" class="abs low">10/86</td>
</tr>
<tr>
<td class="file high" data-value="chunkstream.js"><a href="chunkstream.js.html">chunkstream.js</a></td>
<td data-value="90.11" class="pic high">
<div class="chart"><div class="cover-fill" style="width: 90%"></div><div class="cover-empty" style="width: 10%"></div></div>
</td>
<td data-value="90.11" class="pct high">90.11%</td>
<td data-value="91" class="abs high">82/91</td>
<td data-value="81.4" class="pct high">81.4%</td>
<td data-value="43" class="abs high">35/43</td>
<td data-value="100" class="pct high">100%</td>
<td data-value="10" class="abs high">10/10</td>
<td data-value="90.11" class="pct high">90.11%</td>
<td data-value="91" class="abs high">82/91</td>
</tr>
<tr>
<td class="file high" data-value="constants.js"><a href="constants.js.html">constants.js</a></td>
<td data-value="100" class="pic high">
<div class="chart"><div class="cover-fill cover-full" style="width: 100%"></div><div class="cover-empty" style="width: 0%"></div></div>
</td>
<td data-value="100" class="pct high">100%</td>
<td data-value="1" class="abs high">1/1</td>
<td data-value="100" class="pct high">100%</td>
<td data-value="0" class="abs high">0/0</td>
<td data-value="100" class="pct high">100%</td>
<td data-value="0" class="abs high">0/0</td>
<td data-value="100" class="pct high">100%</td>
<td data-value="1" class="abs high">1/1</td>
</tr>
<tr>
<td class="file high" data-value="crc.js"><a href="crc.js.html">crc.js</a></td>
<td data-value="100" class="pic high">
<div class="chart"><div class="cover-fill cover-full" style="width: 100%"></div><div class="cover-empty" style="width: 0%"></div></div>
</td>
<td data-value="100" class="pct high">100%</td>
<td data-value="26" class="abs high">26/26</td>
<td data-value="100" class="pct high">100%</td>
<td data-value="2" class="abs high">2/2</td>
<td data-value="100" class="pct high">100%</td>
<td data-value="5" class="abs high">5/5</td>
<td data-value="100" class="pct high">100%</td>
<td data-value="22" class="abs high">22/22</td>
</tr>
<tr>
<td class="file high" data-value="filter-pack.js"><a href="filter-pack.js.html">filter-pack.js</a></td>
<td data-value="95.83" class="pic high">
<div class="chart"><div class="cover-fill" style="width: 95%"></div><div class="cover-empty" style="width: 5%"></div></div>
</td>
<td data-value="95.83" class="pct high">95.83%</td>
<td data-value="96" class="abs high">92/96</td>
<td data-value="81.82" class="pct high">81.82%</td>
<td data-value="44" class="abs high">36/44</td>
<td data-value="100" class="pct high">100%</td>
<td data-value="11" class="abs high">11/11</td>
<td data-value="95.24" class="pct high">95.24%</td>
<td data-value="84" class="abs high">80/84</td>
</tr>
<tr>
<td class="file high" data-value="filter-parse-async.js"><a href="filter-parse-async.js.html">filter-parse-async.js</a></td>
<td data-value="100" class="pic high">
<div class="chart"><div class="cover-fill cover-full" style="width: 100%"></div><div class="cover-empty" style="width: 0%"></div></div>
</td>
<td data-value="100" class="pct high">100%</td>
<td data-value="12" class="abs high">12/12</td>
<td data-value="100" class="pct high">100%</td>
<td data-value="0" class="abs high">0/0</td>
<td data-value="100" class="pct high">100%</td>
<td data-value="3" class="abs high">3/3</td>
<td data-value="100" class="pct high">100%</td>
<td data-value="12" class="abs high">12/12</td>
</tr>
<tr>
<td class="file high" data-value="filter-parse-sync.js"><a href="filter-parse-sync.js.html">filter-parse-sync.js</a></td>
<td data-value="100" class="pic high">
<div class="chart"><div class="cover-fill cover-full" style="width: 100%"></div><div class="cover-empty" style="width: 0%"></div></div>
</td>
<td data-value="100" class="pct high">100%</td>
<td data-value="10" class="abs high">10/10</td>
<td data-value="100" class="pct high">100%</td>
<td data-value="0" class="abs high">0/0</td>
<td data-value="100" class="pct high">100%</td>
<td data-value="3" class="abs high">3/3</td>
<td data-value="100" class="pct high">100%</td>
<td data-value="10" class="abs high">10/10</td>
</tr>
<tr>
<td class="file high" data-value="filter-parse.js"><a href="filter-parse.js.html">filter-parse.js</a></td>
<td data-value="98.96" class="pic high">
<div class="chart"><div class="cover-fill" style="width: 98%"></div><div class="cover-empty" style="width: 2%"></div></div>
</td>
<td data-value="98.96" class="pct high">98.96%</td>
<td data-value="96" class="abs high">95/96</td>
<td data-value="97.14" class="pct high">97.14%</td>
<td data-value="35" class="abs high">34/35</td>
<td data-value="100" class="pct high">100%</td>
<td data-value="8" class="abs high">8/8</td>
<td data-value="98.9" class="pct high">98.9%</td>
<td data-value="91" class="abs high">90/91</td>
</tr>
<tr>
<td class="file high" data-value="format-normaliser.js"><a href="format-normaliser.js.html">format-normaliser.js</a></td>
<td data-value="98.21" class="pic high">
<div class="chart"><div class="cover-fill" style="width: 98%"></div><div class="cover-empty" style="width: 2%"></div></div>
</td>
<td data-value="98.21" class="pct high">98.21%</td>
<td data-value="56" class="abs high">55/56</td>
<td data-value="95.24" class="pct high">95.24%</td>
<td data-value="21" class="abs high">20/21</td>
<td data-value="100" class="pct high">100%</td>
<td data-value="4" class="abs high">4/4</td>
<td data-value="97.87" class="pct high">97.87%</td>
<td data-value="47" class="abs high">46/47</td>
</tr>
<tr>
<td class="file high" data-value="interlace.js"><a href="interlace.js.html">interlace.js</a></td>
<td data-value="100" class="pic high">
<div class="chart"><div class="cover-fill cover-full" style="width: 100%"></div><div class="cover-empty" style="width: 0%"></div></div>
</td>
<td data-value="100" class="pct high">100%</td>
<td data-value="32" class="abs high">32/32</td>
<td data-value="100" class="pct high">100%</td>
<td data-value="8" class="abs high">8/8</td>
<td data-value="100" class="pct high">100%</td>
<td data-value="3" class="abs high">3/3</td>
<td data-value="100" class="pct high">100%</td>
<td data-value="29" class="abs high">29/29</td>
</tr>
<tr>
<td class="file high" data-value="packer-async.js"><a href="packer-async.js.html">packer-async.js</a></td>
<td data-value="100" class="pic high">
<div class="chart"><div class="cover-fill cover-full" style="width: 100%"></div><div class="cover-empty" style="width: 0%"></div></div>
</td>
<td data-value="100" class="pct high">100%</td>
<td data-value="24" class="abs high">24/24</td>
<td data-value="75" class="pct medium">75%</td>
<td data-value="4" class="abs medium">3/4</td>
<td data-value="100" class="pct high">100%</td>
<td data-value="4" class="abs high">4/4</td>
<td data-value="100" class="pct high">100%</td>
<td data-value="24" class="abs high">24/24</td>
</tr>
<tr>
<td class="file low" data-value="packer-sync.js"><a href="packer-sync.js.html">packer-sync.js</a></td>
<td data-value="25" class="pic low">
<div class="chart"><div class="cover-fill" style="width: 25%"></div><div class="cover-empty" style="width: 75%"></div></div>
</td>
<td data-value="25" class="pct low">25%</td>
<td data-value="24" class="abs low">6/24</td>
<td data-value="8.33" class="pct low">8.33%</td>
<td data-value="12" class="abs low">1/12</td>
<td data-value="0" class="pct low">0%</td>
<td data-value="1" class="abs low">0/1</td>
<td data-value="25" class="pct low">25%</td>
<td data-value="24" class="abs low">6/24</td>
</tr>
<tr>
<td class="file high" data-value="packer.js"><a href="packer.js.html">packer.js</a></td>
<td data-value="94.74" class="pic high">
<div class="chart"><div class="cover-fill" style="width: 94%"></div><div class="cover-empty" style="width: 6%"></div></div>
</td>
<td data-value="94.74" class="pct high">94.74%</td>
<td data-value="57" class="abs high">54/57</td>
<td data-value="67.86" class="pct medium">67.86%</td>
<td data-value="28" class="abs medium">19/28</td>
<td data-value="100" class="pct high">100%</td>
<td data-value="9" class="abs high">9/9</td>
<td data-value="94.74" class="pct high">94.74%</td>
<td data-value="57" class="abs high">54/57</td>
</tr>
<tr>
<td class="file high" data-value="paeth-predictor.js"><a href="paeth-predictor.js.html">paeth-predictor.js</a></td>
<td data-value="100" class="pic high">
<div class="chart"><div class="cover-fill cover-full" style="width: 100%"></div><div class="cover-empty" style="width: 0%"></div></div>
</td>
<td data-value="100" class="pct high">100%</td>
<td data-value="10" class="abs high">10/10</td>
<td data-value="100" class="pct high">100%</td>
<td data-value="6" class="abs high">6/6</td>
<td data-value="100" class="pct high">100%</td>
<td data-value="1" class="abs high">1/1</td>
<td data-value="100" class="pct high">100%</td>
<td data-value="10" class="abs high">10/10</td>
</tr>
<tr>
<td class="file high" data-value="parser-async.js"><a href="parser-async.js.html">parser-async.js</a></td>
<td data-value="88.75" class="pic high">
<div class="chart"><div class="cover-fill" style="width: 88%"></div><div class="cover-empty" style="width: 12%"></div></div>
</td>
<td data-value="88.75" class="pct high">88.75%</td>
<td data-value="80" class="abs high">71/80</td>
<td data-value="72.73" class="pct medium">72.73%</td>
<td data-value="22" class="abs medium">16/22</td>
<td data-value="84.62" class="pct high">84.62%</td>
<td data-value="13" class="abs high">11/13</td>
<td data-value="88.75" class="pct high">88.75%</td>
<td data-value="80" class="abs high">71/80</td>
</tr>
<tr>
<td class="file high" data-value="parser-sync.js"><a href="parser-sync.js.html">parser-sync.js</a></td>
<td data-value="93.33" class="pic high">
<div class="chart"><div class="cover-fill" style="width: 93%"></div><div class="cover-empty" style="width: 7%"></div></div>
</td>
<td data-value="93.33" class="pct high">93.33%</td>
<td data-value="45" class="abs high">42/45</td>
<td data-value="78.57" class="pct medium">78.57%</td>
<td data-value="14" class="abs medium">11/14</td>
<td data-value="100" class="pct high">100%</td>
<td data-value="8" class="abs high">8/8</td>
<td data-value="93.33" class="pct high">93.33%</td>
<td data-value="45" class="abs high">42/45</td>
</tr>
<tr>
<td class="file high" data-value="parser.js"><a href="parser.js.html">parser.js</a></td>
<td data-value="90.57" class="pic high">
<div class="chart"><div class="cover-fill" style="width: 90%"></div><div class="cover-empty" style="width: 10%"></div></div>
</td>
<td data-value="90.57" class="pct high">90.57%</td>
<td data-value="159" class="abs high">144/159</td>
<td data-value="85.45" class="pct high">85.45%</td>
<td data-value="55" class="abs high">47/55</td>
<td data-value="100" class="pct high">100%</td>
<td data-value="20" class="abs high">20/20</td>
<td data-value="90.32" class="pct high">90.32%</td>
<td data-value="155" class="abs high">140/155</td>
</tr>
<tr>
<td class="file high" data-value="png-sync.js"><a href="png-sync.js.html">png-sync.js</a></td>
<td data-value="83.33" class="pic high">
<div class="chart"><div class="cover-fill" style="width: 83%"></div><div class="cover-empty" style="width: 17%"></div></div>
</td>
<td data-value="83.33" class="pct high">83.33%</td>
<td data-value="6" class="abs high">5/6</td>
<td data-value="100" class="pct high">100%</td>
<td data-value="2" class="abs high">2/2</td>
<td data-value="50" class="pct medium">50%</td>
<td data-value="2" class="abs medium">1/2</td>
<td data-value="83.33" class="pct high">83.33%</td>
<td data-value="6" class="abs high">5/6</td>
</tr>
<tr>
<td class="file medium" data-value="png.js"><a href="png.js.html">png.js</a></td>
<td data-value="54.17" class="pic medium">
<div class="chart"><div class="cover-fill" style="width: 54%"></div><div class="cover-empty" style="width: 46%"></div></div>
</td>
<td data-value="54.17" class="pct medium">54.17%</td>
<td data-value="96" class="abs medium">52/96</td>
<td data-value="41.18" class="pct low">41.18%</td>
<td data-value="34" class="abs low">14/34</td>
<td data-value="56.25" class="pct medium">56.25%</td>
<td data-value="16" class="abs medium">9/16</td>
<td data-value="56.52" class="pct medium">56.52%</td>
<td data-value="92" class="abs medium">52/92</td>
</tr>
<tr>
<td class="file medium" data-value="sync-inflate.js"><a href="sync-inflate.js.html">sync-inflate.js</a></td>
<td data-value="75.31" class="pic medium">
<div class="chart"><div class="cover-fill" style="width: 75%"></div><div class="cover-empty" style="width: 25%"></div></div>
</td>
<td data-value="75.31" class="pct medium">75.31%</td>
<td data-value="81" class="abs medium">61/81</td>
<td data-value="62" class="pct medium">62%</td>
<td data-value="50" class="abs medium">31/50</td>
<td data-value="87.5" class="pct high">87.5%</td>
<td data-value="8" class="abs high">7/8</td>
<td data-value="75.31" class="pct medium">75.31%</td>
<td data-value="81" class="abs medium">61/81</td>
</tr>
<tr>
<td class="file high" data-value="sync-reader.js"><a href="sync-reader.js.html">sync-reader.js</a></td>
<td data-value="88.89" class="pic high">
<div class="chart"><div class="cover-fill" style="width: 88%"></div><div class="cover-empty" style="width: 12%"></div></div>
</td>
<td data-value="88.89" class="pct high">88.89%</td>
<td data-value="18" class="abs high">16/18</td>
<td data-value="72.73" class="pct medium">72.73%</td>
<td data-value="11" class="abs medium">8/11</td>
<td data-value="100" class="pct high">100%</td>
<td data-value="3" class="abs high">3/3</td>
<td data-value="88.89" class="pct high">88.89%</td>
<td data-value="18" class="abs high">16/18</td>
</tr>
</tbody>
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<h1><a href="index.html">All files</a> interlace.js</h1>
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<div class='fl pad1y space-right2'>
<span class="strong">100% </span>
<span class="quiet">Statements</span>
<span class='fraction'>32/32</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">100% </span>
<span class="quiet">Branches</span>
<span class='fraction'>8/8</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">100% </span>
<span class="quiet">Functions</span>
<span class='fraction'>3/3</span>
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<div class='fl pad1y space-right2'>
<span class="strong">100% </span>
<span class="quiet">Lines</span>
<span class='fraction'>29/29</span>
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<pre><table class="coverage">
<tr><td class="line-count quiet"><a name='L1'></a><a href='#L1'>1</a>
<a name='L2'></a><a href='#L2'>2</a>
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<a name='L12'></a><a href='#L12'>12</a>
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<a name='L57'></a><a href='#L57'>57</a>
<a name='L58'></a><a href='#L58'>58</a>
<a name='L59'></a><a href='#L59'>59</a>
<a name='L60'></a><a href='#L60'>60</a>
<a name='L61'></a><a href='#L61'>61</a>
<a name='L62'></a><a href='#L62'>62</a>
<a name='L63'></a><a href='#L63'>63</a>
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<a name='L66'></a><a href='#L66'>66</a>
<a name='L67'></a><a href='#L67'>67</a>
<a name='L68'></a><a href='#L68'>68</a>
<a name='L69'></a><a href='#L69'>69</a>
<a name='L70'></a><a href='#L70'>70</a>
<a name='L71'></a><a href='#L71'>71</a>
<a name='L72'></a><a href='#L72'>72</a>
<a name='L73'></a><a href='#L73'>73</a>
<a name='L74'></a><a href='#L74'>74</a>
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<a name='L76'></a><a href='#L76'>76</a>
<a name='L77'></a><a href='#L77'>77</a>
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<a name='L79'></a><a href='#L79'>79</a>
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<a name='L81'></a><a href='#L81'>81</a>
<a name='L82'></a><a href='#L82'>82</a>
<a name='L83'></a><a href='#L83'>83</a>
<a name='L84'></a><a href='#L84'>84</a>
<a name='L85'></a><a href='#L85'>85</a>
<a name='L86'></a><a href='#L86'>86</a>
<a name='L87'></a><a href='#L87'>87</a>
<a name='L88'></a><a href='#L88'>88</a>
<a name='L89'></a><a href='#L89'>89</a>
<a name='L90'></a><a href='#L90'>90</a>
<a name='L91'></a><a href='#L91'>91</a>
<a name='L92'></a><a href='#L92'>92</a>
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<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">"use strict";
&nbsp;
// Adam 7
// 0 1 2 3 4 5 6 7
// 0 x 6 4 6 x 6 4 6
// 1 7 7 7 7 7 7 7 7
// 2 5 6 5 6 5 6 5 6
// 3 7 7 7 7 7 7 7 7
// 4 3 6 4 6 3 6 4 6
// 5 7 7 7 7 7 7 7 7
// 6 5 6 5 6 5 6 5 6
// 7 7 7 7 7 7 7 7 7
&nbsp;
let imagePasses = [
{
// pass 1 - 1px
x: [0],
y: [0],
},
{
// pass 2 - 1px
x: [4],
y: [0],
},
{
// pass 3 - 2px
x: [0, 4],
y: [4],
},
{
// pass 4 - 4px
x: [2, 6],
y: [0, 4],
},
{
// pass 5 - 8px
x: [0, 2, 4, 6],
y: [2, 6],
},
{
// pass 6 - 16px
x: [1, 3, 5, 7],
y: [0, 2, 4, 6],
},
{
// pass 7 - 32px
x: [0, 1, 2, 3, 4, 5, 6, 7],
y: [1, 3, 5, 7],
},
];
&nbsp;
exports.getImagePasses = function (width, height) {
let images = [];
let xLeftOver = width % 8;
let yLeftOver = height % 8;
let xRepeats = (width - xLeftOver) / 8;
let yRepeats = (height - yLeftOver) / 8;
for (let i = 0; i &lt; imagePasses.length; i++) {
let pass = imagePasses[i];
let passWidth = xRepeats * pass.x.length;
let passHeight = yRepeats * pass.y.length;
for (let j = 0; j &lt; pass.x.length; j++) {
if (pass.x[j] &lt; xLeftOver) {
passWidth++;
} else {
break;
}
}
for (let j = 0; j &lt; pass.y.length; j++) {
if (pass.y[j] &lt; yLeftOver) {
passHeight++;
} else {
break;
}
}
if (passWidth &gt; 0 &amp;&amp; passHeight &gt; 0) {
images.push({ width: passWidth, height: passHeight, index: i });
}
}
return images;
};
&nbsp;
exports.getInterlaceIterator = function (width) {
return function (x, y, pass) {
let outerXLeftOver = x % imagePasses[pass].x.length;
let outerX =
((x - outerXLeftOver) / imagePasses[pass].x.length) * 8 +
imagePasses[pass].x[outerXLeftOver];
let outerYLeftOver = y % imagePasses[pass].y.length;
let outerY =
((y - outerYLeftOver) / imagePasses[pass].y.length) * 8 +
imagePasses[pass].y[outerYLeftOver];
return outerX * 4 + outerY * width * 4;
};
};
&nbsp;</pre></td></tr></table></pre>
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<span class="strong">100% </span>
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<span class='fraction'>24/24</span>
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<div class='fl pad1y space-right2'>
<span class="strong">75% </span>
<span class="quiet">Branches</span>
<span class='fraction'>3/4</span>
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<pre><table class="coverage">
<tr><td class="line-count quiet"><a name='L1'></a><a href='#L1'>1</a>
<a name='L2'></a><a href='#L2'>2</a>
<a name='L3'></a><a href='#L3'>3</a>
<a name='L4'></a><a href='#L4'>4</a>
<a name='L5'></a><a href='#L5'>5</a>
<a name='L6'></a><a href='#L6'>6</a>
<a name='L7'></a><a href='#L7'>7</a>
<a name='L8'></a><a href='#L8'>8</a>
<a name='L9'></a><a href='#L9'>9</a>
<a name='L10'></a><a href='#L10'>10</a>
<a name='L11'></a><a href='#L11'>11</a>
<a name='L12'></a><a href='#L12'>12</a>
<a name='L13'></a><a href='#L13'>13</a>
<a name='L14'></a><a href='#L14'>14</a>
<a name='L15'></a><a href='#L15'>15</a>
<a name='L16'></a><a href='#L16'>16</a>
<a name='L17'></a><a href='#L17'>17</a>
<a name='L18'></a><a href='#L18'>18</a>
<a name='L19'></a><a href='#L19'>19</a>
<a name='L20'></a><a href='#L20'>20</a>
<a name='L21'></a><a href='#L21'>21</a>
<a name='L22'></a><a href='#L22'>22</a>
<a name='L23'></a><a href='#L23'>23</a>
<a name='L24'></a><a href='#L24'>24</a>
<a name='L25'></a><a href='#L25'>25</a>
<a name='L26'></a><a href='#L26'>26</a>
<a name='L27'></a><a href='#L27'>27</a>
<a name='L28'></a><a href='#L28'>28</a>
<a name='L29'></a><a href='#L29'>29</a>
<a name='L30'></a><a href='#L30'>30</a>
<a name='L31'></a><a href='#L31'>31</a>
<a name='L32'></a><a href='#L32'>32</a>
<a name='L33'></a><a href='#L33'>33</a>
<a name='L34'></a><a href='#L34'>34</a>
<a name='L35'></a><a href='#L35'>35</a>
<a name='L36'></a><a href='#L36'>36</a>
<a name='L37'></a><a href='#L37'>37</a>
<a name='L38'></a><a href='#L38'>38</a>
<a name='L39'></a><a href='#L39'>39</a>
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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 util = require("util");
let Stream = require("stream");
let constants = require("./constants");
let Packer = require("./packer");
&nbsp;
let PackerAsync = (module.exports = function (opt) {
Stream.call(this);
&nbsp;
let options = opt || <span class="branch-1 cbranch-no" title="branch not covered" >{};</span>
&nbsp;
this._packer = new Packer(options);
this._deflate = this._packer.createDeflate();
&nbsp;
this.readable = true;
});
util.inherits(PackerAsync, Stream);
&nbsp;
PackerAsync.prototype.pack = function (data, width, height, gamma) {
// Signature
this.emit("data", Buffer.from(constants.PNG_SIGNATURE));
this.emit("data", this._packer.packIHDR(width, height));
&nbsp;
if (gamma) {
this.emit("data", this._packer.packGAMA(gamma));
}
&nbsp;
let filteredData = this._packer.filterData(data, width, height);
&nbsp;
// compress it
this._deflate.on("error", this.emit.bind(this, "error"));
&nbsp;
this._deflate.on(
"data",
function (compressedData) {
this.emit("data", this._packer.packIDAT(compressedData));
}.bind(this)
);
&nbsp;
this._deflate.on(
"end",
function () {
this.emit("data", this._packer.packIEND());
this.emit("end");
}.bind(this)
);
&nbsp;
this._deflate.end(filteredData);
};
&nbsp;</pre></td></tr></table></pre>
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at Fri Apr 10 2020 13:53:16 GMT+0200 (Central European Summer Time)
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<h1><a href="index.html">All files</a> packer-sync.js</h1>
<div class='clearfix'>
<div class='fl pad1y space-right2'>
<span class="strong">25% </span>
<span class="quiet">Statements</span>
<span class='fraction'>6/24</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">8.33% </span>
<span class="quiet">Branches</span>
<span class='fraction'>1/12</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">0% </span>
<span class="quiet">Functions</span>
<span class='fraction'>0/1</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">25% </span>
<span class="quiet">Lines</span>
<span class='fraction'>6/24</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.
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<pre><table class="coverage">
<tr><td class="line-count quiet"><a name='L1'></a><a href='#L1'>1</a>
<a name='L2'></a><a href='#L2'>2</a>
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<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-no">&nbsp;</span>
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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 hasSyncZlib = true;
let zlib = require("zlib");
<span class="missing-if-branch" title="if path not taken" >I</span>if (!zlib.deflateSync) {
<span class="cstat-no" title="statement not covered" > hasSyncZlib = false;</span>
}
let constants = require("./constants");
let Packer = require("./packer");
&nbsp;
module.exports = <span class="fstat-no" title="function not covered" >fu</span>nction (metaData, opt) {
<span class="cstat-no" title="statement not covered" > if (!hasSyncZlib) {</span>
<span class="cstat-no" title="statement not covered" > throw new Error(</span>
"To use the sync capability of this library in old node versions, please pin pngjs to v2.3.0"
);
}
&nbsp;
let options = <span class="cstat-no" title="statement not covered" >opt || {};</span>
&nbsp;
let packer = <span class="cstat-no" title="statement not covered" >new Packer(options);</span>
&nbsp;
let chunks = <span class="cstat-no" title="statement not covered" >[];</span>
&nbsp;
// Signature
<span class="cstat-no" title="statement not covered" > chunks.push(Buffer.from(constants.PNG_SIGNATURE));</span>
&nbsp;
// Header
<span class="cstat-no" title="statement not covered" > chunks.push(packer.packIHDR(metaData.width, metaData.height));</span>
&nbsp;
<span class="cstat-no" title="statement not covered" > if (metaData.gamma) {</span>
<span class="cstat-no" title="statement not covered" > chunks.push(packer.packGAMA(metaData.gamma));</span>
}
&nbsp;
let filteredData = <span class="cstat-no" title="statement not covered" >packer.filterData(</span>
metaData.data,
metaData.width,
metaData.height
);
&nbsp;
// compress it
let compressedData = <span class="cstat-no" title="statement not covered" >zlib.deflateSync(</span>
filteredData,
packer.getDeflateOptions()
);
<span class="cstat-no" title="statement not covered" > filteredData = null;</span>
&nbsp;
<span class="cstat-no" title="statement not covered" > if (!compressedData || !compressedData.length) {</span>
<span class="cstat-no" title="statement not covered" > throw new Error("bad png - invalid compressed data response");</span>
}
<span class="cstat-no" title="statement not covered" > chunks.push(packer.packIDAT(compressedData));</span>
&nbsp;
// End
<span class="cstat-no" title="statement not covered" > chunks.push(packer.packIEND());</span>
&nbsp;
<span class="cstat-no" title="statement not covered" > return Buffer.concat(chunks);</span>
};
&nbsp;</pre></td></tr></table></pre>
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at Fri Apr 10 2020 13:53:16 GMT+0200 (Central European Summer Time)
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@@ -0,0 +1,467 @@
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<head>
<title>Code coverage report for packer.js</title>
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<h1><a href="index.html">All files</a> packer.js</h1>
<div class='clearfix'>
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<span class="strong">94.74% </span>
<span class="quiet">Statements</span>
<span class='fraction'>54/57</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">67.86% </span>
<span class="quiet">Branches</span>
<span class='fraction'>19/28</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">100% </span>
<span class="quiet">Functions</span>
<span class='fraction'>9/9</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">94.74% </span>
<span class="quiet">Lines</span>
<span class='fraction'>54/57</span>
</div>
</div>
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<pre><table class="coverage">
<tr><td class="line-count quiet"><a name='L1'></a><a href='#L1'>1</a>
<a name='L2'></a><a href='#L2'>2</a>
<a name='L3'></a><a href='#L3'>3</a>
<a name='L4'></a><a href='#L4'>4</a>
<a name='L5'></a><a href='#L5'>5</a>
<a name='L6'></a><a href='#L6'>6</a>
<a name='L7'></a><a href='#L7'>7</a>
<a name='L8'></a><a href='#L8'>8</a>
<a name='L9'></a><a href='#L9'>9</a>
<a name='L10'></a><a href='#L10'>10</a>
<a name='L11'></a><a href='#L11'>11</a>
<a name='L12'></a><a href='#L12'>12</a>
<a name='L13'></a><a href='#L13'>13</a>
<a name='L14'></a><a href='#L14'>14</a>
<a name='L15'></a><a href='#L15'>15</a>
<a name='L16'></a><a href='#L16'>16</a>
<a name='L17'></a><a href='#L17'>17</a>
<a name='L18'></a><a href='#L18'>18</a>
<a name='L19'></a><a href='#L19'>19</a>
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<a name='L21'></a><a href='#L21'>21</a>
<a name='L22'></a><a href='#L22'>22</a>
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<a name='L27'></a><a href='#L27'>27</a>
<a name='L28'></a><a href='#L28'>28</a>
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<a name='L32'></a><a href='#L32'>32</a>
<a name='L33'></a><a href='#L33'>33</a>
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<a name='L37'></a><a href='#L37'>37</a>
<a name='L38'></a><a href='#L38'>38</a>
<a name='L39'></a><a href='#L39'>39</a>
<a name='L40'></a><a href='#L40'>40</a>
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<a name='L43'></a><a href='#L43'>43</a>
<a name='L44'></a><a href='#L44'>44</a>
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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 CrcStream = require("./crc");
let bitPacker = require("./bitpacker");
let filter = require("./filter-pack");
let zlib = require("zlib");
&nbsp;
let Packer = (module.exports = function (options) {
this._options = options;
&nbsp;
options.deflateChunkSize = options.deflateChunkSize || 32 * 1024;
options.deflateLevel =
options.deflateLevel != null ? <span class="branch-0 cbranch-no" title="branch not covered" >options.deflateLevel </span>: 9;
options.deflateStrategy =
options.deflateStrategy != null ? <span class="branch-0 cbranch-no" title="branch not covered" >options.deflateStrategy </span>: 3;
options.inputHasAlpha =
options.inputHasAlpha != null ? <span class="branch-0 cbranch-no" title="branch not covered" >options.inputHasAlpha </span>: true;
options.deflateFactory = options.deflateFactory || zlib.createDeflate;
options.bitDepth = options.bitDepth || 8;
// This is outputColorType
options.colorType =
typeof options.colorType === "number"
? <span class="branch-0 cbranch-no" title="branch not covered" >options.colorType</span>
: constants.COLORTYPE_COLOR_ALPHA;
options.inputColorType =
typeof options.inputColorType === "number"
? <span class="branch-0 cbranch-no" title="branch not covered" >options.inputColorType</span>
: constants.COLORTYPE_COLOR_ALPHA;
&nbsp;
<span class="missing-if-branch" title="if path not taken" >I</span>if (
[
constants.COLORTYPE_GRAYSCALE,
constants.COLORTYPE_COLOR,
constants.COLORTYPE_COLOR_ALPHA,
constants.COLORTYPE_ALPHA,
].indexOf(options.colorType) === -1
) {
<span class="cstat-no" title="statement not covered" > throw new Error(</span>
"option color type:" + options.colorType + " is not supported at present"
);
}
<span class="missing-if-branch" title="if path not taken" >I</span>if (
[
constants.COLORTYPE_GRAYSCALE,
constants.COLORTYPE_COLOR,
constants.COLORTYPE_COLOR_ALPHA,
constants.COLORTYPE_ALPHA,
].indexOf(options.inputColorType) === -1
) {
<span class="cstat-no" title="statement not covered" > throw new Error(</span>
"option input color type:" +
options.inputColorType +
" is not supported at present"
);
}
<span class="missing-if-branch" title="if path not taken" >I</span>if (options.bitDepth !== 8 &amp;&amp; <span class="branch-1 cbranch-no" title="branch not covered" >options.bitDepth !== 16)</span> {
<span class="cstat-no" title="statement not covered" > throw new Error(</span>
"option bit depth:" + options.bitDepth + " is not supported at present"
);
}
});
&nbsp;
Packer.prototype.getDeflateOptions = function () {
return {
chunkSize: this._options.deflateChunkSize,
level: this._options.deflateLevel,
strategy: this._options.deflateStrategy,
};
};
&nbsp;
Packer.prototype.createDeflate = function () {
return this._options.deflateFactory(this.getDeflateOptions());
};
&nbsp;
Packer.prototype.filterData = function (data, width, height) {
// convert to correct format for filtering (e.g. right bpp and bit depth)
let packedData = bitPacker(data, width, height, this._options);
&nbsp;
// filter pixel data
let bpp = constants.COLORTYPE_TO_BPP_MAP[this._options.colorType];
let filteredData = filter(packedData, width, height, this._options, bpp);
return filteredData;
};
&nbsp;
Packer.prototype._packChunk = function (type, data) {
let len = data ? data.length : 0;
let buf = Buffer.alloc(len + 12);
&nbsp;
buf.writeUInt32BE(len, 0);
buf.writeUInt32BE(type, 4);
&nbsp;
if (data) {
data.copy(buf, 8);
}
&nbsp;
buf.writeInt32BE(
CrcStream.crc32(buf.slice(4, buf.length - 4)),
buf.length - 4
);
return buf;
};
&nbsp;
Packer.prototype.packGAMA = function (gamma) {
let buf = Buffer.alloc(4);
buf.writeUInt32BE(Math.floor(gamma * constants.GAMMA_DIVISION), 0);
return this._packChunk(constants.TYPE_gAMA, buf);
};
&nbsp;
Packer.prototype.packIHDR = function (width, height) {
let buf = Buffer.alloc(13);
buf.writeUInt32BE(width, 0);
buf.writeUInt32BE(height, 4);
buf[8] = this._options.bitDepth; // Bit depth
buf[9] = this._options.colorType; // colorType
buf[10] = 0; // compression
buf[11] = 0; // filter
buf[12] = 0; // interlace
&nbsp;
return this._packChunk(constants.TYPE_IHDR, buf);
};
&nbsp;
Packer.prototype.packIDAT = function (data) {
return this._packChunk(constants.TYPE_IDAT, data);
};
&nbsp;
Packer.prototype.packIEND = function () {
return this._packChunk(constants.TYPE_IEND, null);
};
&nbsp;</pre></td></tr></table></pre>
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at Fri Apr 10 2020 13:53:16 GMT+0200 (Central European Summer Time)
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<html lang="en">
<head>
<title>Code coverage report for paeth-predictor.js</title>
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<h1><a href="index.html">All files</a> paeth-predictor.js</h1>
<div class='clearfix'>
<div class='fl pad1y space-right2'>
<span class="strong">100% </span>
<span class="quiet">Statements</span>
<span class='fraction'>10/10</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">100% </span>
<span class="quiet">Branches</span>
<span class='fraction'>6/6</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">100% </span>
<span class="quiet">Functions</span>
<span class='fraction'>1/1</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">100% </span>
<span class="quiet">Lines</span>
<span class='fraction'>10/10</span>
</div>
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<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>
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<pre><table class="coverage">
<tr><td class="line-count quiet"><a name='L1'></a><a href='#L1'>1</a>
<a name='L2'></a><a href='#L2'>2</a>
<a name='L3'></a><a href='#L3'>3</a>
<a name='L4'></a><a href='#L4'>4</a>
<a name='L5'></a><a href='#L5'>5</a>
<a name='L6'></a><a href='#L6'>6</a>
<a name='L7'></a><a href='#L7'>7</a>
<a name='L8'></a><a href='#L8'>8</a>
<a name='L9'></a><a href='#L9'>9</a>
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<a name='L11'></a><a href='#L11'>11</a>
<a name='L12'></a><a href='#L12'>12</a>
<a name='L13'></a><a href='#L13'>13</a>
<a name='L14'></a><a href='#L14'>14</a>
<a name='L15'></a><a href='#L15'>15</a>
<a name='L16'></a><a href='#L16'>16</a>
<a name='L17'></a><a href='#L17'>17</a></td><td class="line-coverage quiet"><span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-yes">1x</span>
<span class="cline-any cline-yes">5808408x</span>
<span class="cline-any cline-yes">5808408x</span>
<span class="cline-any cline-yes">5808408x</span>
<span class="cline-any cline-yes">5808408x</span>
<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-yes">5808408x</span>
<span class="cline-any cline-yes">5156742x</span>
<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-yes">651666x</span>
<span class="cline-any cline-yes">539893x</span>
<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-yes">111773x</span>
<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">"use strict";
&nbsp;
module.exports = function paethPredictor(left, above, upLeft) {
let paeth = left + above - upLeft;
let pLeft = Math.abs(paeth - left);
let pAbove = Math.abs(paeth - above);
let pUpLeft = Math.abs(paeth - upLeft);
&nbsp;
if (pLeft &lt;= pAbove &amp;&amp; pLeft &lt;= pUpLeft) {
return left;
}
if (pAbove &lt;= pUpLeft) {
return above;
}
return upLeft;
};
&nbsp;</pre></td></tr></table></pre>
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Code coverage generated by
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at Fri Apr 10 2020 13:53:16 GMT+0200 (Central European Summer Time)
</div>
</div>
<script src="prettify.js"></script>
<script>
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<!doctype html>
<html lang="en">
<head>
<title>Code coverage report for parser-async.js</title>
<meta charset="utf-8" />
<link rel="stylesheet" href="prettify.css" />
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<div class='clearfix'>
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<span class="strong">88.75% </span>
<span class="quiet">Statements</span>
<span class='fraction'>71/80</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">72.73% </span>
<span class="quiet">Branches</span>
<span class='fraction'>16/22</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">84.62% </span>
<span class="quiet">Functions</span>
<span class='fraction'>11/13</span>
</div>
<div class='fl pad1y space-right2'>
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<span class="quiet">Lines</span>
<span class='fraction'>71/80</span>
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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.
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<pre><table class="coverage">
<tr><td class="line-count quiet"><a name='L1'></a><a href='#L1'>1</a>
<a name='L2'></a><a href='#L2'>2</a>
<a name='L3'></a><a href='#L3'>3</a>
<a name='L4'></a><a href='#L4'>4</a>
<a name='L5'></a><a href='#L5'>5</a>
<a name='L6'></a><a href='#L6'>6</a>
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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 util = require("util");
let zlib = require("zlib");
let ChunkStream = require("./chunkstream");
let FilterAsync = require("./filter-parse-async");
let Parser = require("./parser");
let bitmapper = require("./bitmapper");
let formatNormaliser = require("./format-normaliser");
&nbsp;
let ParserAsync = (module.exports = function (options) {
ChunkStream.call(this);
&nbsp;
this._parser = new Parser(options, {
read: this.read.bind(this),
error: this._handleError.bind(this),
metadata: this._handleMetaData.bind(this),
gamma: this.emit.bind(this, "gamma"),
palette: this._handlePalette.bind(this),
transColor: this._handleTransColor.bind(this),
finished: this._finished.bind(this),
inflateData: this._inflateData.bind(this),
simpleTransparency: this._simpleTransparency.bind(this),
headersFinished: this._headersFinished.bind(this),
});
this._options = options;
this.writable = true;
&nbsp;
this._parser.start();
});
util.inherits(ParserAsync, ChunkStream);
&nbsp;
ParserAsync.prototype._handleError = function (err) {
this.emit("error", err);
&nbsp;
this.writable = false;
&nbsp;
this.destroy();
&nbsp;
if (this._inflate &amp;&amp; this._inflate.destroy) {
this._inflate.destroy();
}
&nbsp;
if (this._filter) {
this._filter.destroy();
// For backward compatibility with Node 7 and below.
// Suppress errors due to _inflate calling write() even after
// it's destroy()'ed.
this._filter.on("error", <span class="fstat-no" title="function not covered" >fu</span>nction () {});
}
&nbsp;
this.errord = true;
};
&nbsp;
ParserAsync.prototype._inflateData = function (data) {
if (!this._inflate) {
if (this._bitmapInfo.interlace) {
this._inflate = zlib.createInflate();
&nbsp;
this._inflate.on("error", this.emit.bind(this, "error"));
this._filter.on("complete", this._complete.bind(this));
&nbsp;
this._inflate.pipe(this._filter);
} else {
let rowSize =
((this._bitmapInfo.width *
this._bitmapInfo.bpp *
this._bitmapInfo.depth +
7) &gt;&gt;
3) +
1;
let imageSize = rowSize * this._bitmapInfo.height;
let chunkSize = Math.max(imageSize, zlib.Z_MIN_CHUNK);
&nbsp;
this._inflate = zlib.createInflate({ chunkSize: chunkSize });
let leftToInflate = imageSize;
&nbsp;
let emitError = this.emit.bind(this, "error");
this._inflate.on("error", <span class="fstat-no" title="function not covered" >fu</span>nction (err) {
<span class="cstat-no" title="statement not covered" > if (!leftToInflate) {</span>
<span class="cstat-no" title="statement not covered" > return;</span>
}
&nbsp;
<span class="cstat-no" title="statement not covered" > emitError(err);</span>
});
this._filter.on("complete", this._complete.bind(this));
&nbsp;
let filterWrite = this._filter.write.bind(this._filter);
this._inflate.on("data", function (chunk) {
<span class="missing-if-branch" title="if path not taken" >I</span>if (!leftToInflate) {
<span class="cstat-no" title="statement not covered" > return;</span>
}
&nbsp;
<span class="missing-if-branch" title="if path not taken" >I</span>if (chunk.length &gt; leftToInflate) {
<span class="cstat-no" title="statement not covered" > chunk = chunk.slice(0, leftToInflate);</span>
}
&nbsp;
leftToInflate -= chunk.length;
&nbsp;
filterWrite(chunk);
});
&nbsp;
this._inflate.on("end", this._filter.end.bind(this._filter));
}
}
this._inflate.write(data);
};
&nbsp;
ParserAsync.prototype._handleMetaData = function (metaData) {
this._metaData = metaData;
this._bitmapInfo = Object.create(metaData);
&nbsp;
this._filter = new FilterAsync(this._bitmapInfo);
};
&nbsp;
ParserAsync.prototype._handleTransColor = function (transColor) {
this._bitmapInfo.transColor = transColor;
};
&nbsp;
ParserAsync.prototype._handlePalette = function (palette) {
this._bitmapInfo.palette = palette;
};
&nbsp;
ParserAsync.prototype._simpleTransparency = function () {
this._metaData.alpha = true;
};
&nbsp;
ParserAsync.prototype._headersFinished = function () {
// Up until this point, we don't know if we have a tRNS chunk (alpha)
// so we can't emit metadata any earlier
this.emit("metadata", this._metaData);
};
&nbsp;
ParserAsync.prototype._finished = function () {
<span class="missing-if-branch" title="if path not taken" >I</span>if (this.errord) {
<span class="cstat-no" title="statement not covered" > return;</span>
}
&nbsp;
if (!this._inflate) {
this.emit("error", "No Inflate block");
} else {
// no more data to inflate
this._inflate.end();
}
};
&nbsp;
ParserAsync.prototype._complete = function (filteredData) {
<span class="missing-if-branch" title="if path not taken" >I</span>if (this.errord) {
<span class="cstat-no" title="statement not covered" > return;</span>
}
&nbsp;
let normalisedBitmapData;
&nbsp;
try {
let bitmapData = bitmapper.dataToBitMap(filteredData, this._bitmapInfo);
&nbsp;
normalisedBitmapData = formatNormaliser(bitmapData, this._bitmapInfo);
bitmapData = null;
} catch (ex) {
<span class="cstat-no" title="statement not covered" > this._handleError(ex);</span>
<span class="cstat-no" title="statement not covered" > return;</span>
}
&nbsp;
this.emit("parsed", normalisedBitmapData);
};
&nbsp;</pre></td></tr></table></pre>
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<h1><a href="index.html">All files</a> parser-sync.js</h1>
<div class='clearfix'>
<div class='fl pad1y space-right2'>
<span class="strong">93.33% </span>
<span class="quiet">Statements</span>
<span class='fraction'>42/45</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">78.57% </span>
<span class="quiet">Branches</span>
<span class='fraction'>11/14</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">100% </span>
<span class="quiet">Functions</span>
<span class='fraction'>8/8</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">93.33% </span>
<span class="quiet">Lines</span>
<span class='fraction'>42/45</span>
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</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.
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<pre><table class="coverage">
<tr><td class="line-count quiet"><a name='L1'></a><a href='#L1'>1</a>
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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 hasSyncZlib = true;
let zlib = require("zlib");
let inflateSync = require("./sync-inflate");
<span class="missing-if-branch" title="if path not taken" >I</span>if (!zlib.deflateSync) {
<span class="cstat-no" title="statement not covered" > hasSyncZlib = false;</span>
}
let SyncReader = require("./sync-reader");
let FilterSync = require("./filter-parse-sync");
let Parser = require("./parser");
let bitmapper = require("./bitmapper");
let formatNormaliser = require("./format-normaliser");
&nbsp;
module.exports = function (buffer, options) {
<span class="missing-if-branch" title="if path not taken" >I</span>if (!hasSyncZlib) {
<span class="cstat-no" title="statement not covered" > throw new Error(</span>
"To use the sync capability of this library in old node versions, please pin pngjs to v2.3.0"
);
}
&nbsp;
let err;
function handleError(_err_) {
err = _err_;
}
&nbsp;
let metaData;
function handleMetaData(_metaData_) {
metaData = _metaData_;
}
&nbsp;
function handleTransColor(transColor) {
metaData.transColor = transColor;
}
&nbsp;
function handlePalette(palette) {
metaData.palette = palette;
}
&nbsp;
function handleSimpleTransparency() {
metaData.alpha = true;
}
&nbsp;
let gamma;
function handleGamma(_gamma_) {
gamma = _gamma_;
}
&nbsp;
let inflateDataList = [];
function handleInflateData(inflatedData) {
inflateDataList.push(inflatedData);
}
&nbsp;
let reader = new SyncReader(buffer);
&nbsp;
let parser = new Parser(options, {
read: reader.read.bind(reader),
error: handleError,
metadata: handleMetaData,
gamma: handleGamma,
palette: handlePalette,
transColor: handleTransColor,
inflateData: handleInflateData,
simpleTransparency: handleSimpleTransparency,
});
&nbsp;
parser.start();
reader.process();
&nbsp;
if (err) {
throw err;
}
&nbsp;
//join together the inflate datas
let inflateData = Buffer.concat(inflateDataList);
inflateDataList.length = 0;
&nbsp;
let inflatedData;
if (metaData.interlace) {
inflatedData = zlib.inflateSync(inflateData);
} else {
let rowSize =
((metaData.width * metaData.bpp * metaData.depth + 7) &gt;&gt; 3) + 1;
let imageSize = rowSize * metaData.height;
inflatedData = inflateSync(inflateData, {
chunkSize: imageSize,
maxLength: imageSize,
});
}
inflateData = null;
&nbsp;
<span class="missing-if-branch" title="if path not taken" >I</span>if (!inflatedData || !inflatedData.length) {
<span class="cstat-no" title="statement not covered" > throw new Error("bad png - invalid inflate data response");</span>
}
&nbsp;
let unfilteredData = FilterSync.process(inflatedData, metaData);
inflateData = null;
&nbsp;
let bitmapData = bitmapper.dataToBitMap(unfilteredData, metaData);
unfilteredData = null;
&nbsp;
let normalisedBitmapData = formatNormaliser(bitmapData, metaData);
&nbsp;
metaData.data = normalisedBitmapData;
metaData.gamma = gamma || 0;
&nbsp;
return metaData;
};
&nbsp;</pre></td></tr></table></pre>
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at Fri Apr 10 2020 13:53:16 GMT+0200 (Central European Summer Time)
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<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.
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<pre><table class="coverage">
<tr><td class="line-count quiet"><a name='L1'></a><a href='#L1'>1</a>
<a name='L2'></a><a href='#L2'>2</a>
<a name='L3'></a><a href='#L3'>3</a>
<a name='L4'></a><a href='#L4'>4</a>
<a name='L5'></a><a href='#L5'>5</a>
<a name='L6'></a><a href='#L6'>6</a>
<a name='L7'></a><a href='#L7'>7</a>
<a name='L8'></a><a href='#L8'>8</a>
<a name='L9'></a><a href='#L9'>9</a>
<a name='L10'></a><a href='#L10'>10</a>
<a name='L11'></a><a href='#L11'>11</a>
<a name='L12'></a><a href='#L12'>12</a>
<a name='L13'></a><a href='#L13'>13</a>
<a name='L14'></a><a href='#L14'>14</a>
<a name='L15'></a><a href='#L15'>15</a>
<a name='L16'></a><a href='#L16'>16</a>
<a name='L17'></a><a href='#L17'>17</a>
<a name='L18'></a><a href='#L18'>18</a>
<a name='L19'></a><a href='#L19'>19</a>
<a name='L20'></a><a href='#L20'>20</a>
<a name='L21'></a><a href='#L21'>21</a>
<a name='L22'></a><a href='#L22'>22</a>
<a name='L23'></a><a href='#L23'>23</a>
<a name='L24'></a><a href='#L24'>24</a>
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<a name='L261'></a><a href='#L261'>261</a>
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<a name='L263'></a><a href='#L263'>263</a>
<a name='L264'></a><a href='#L264'>264</a>
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<a name='L271'></a><a href='#L271'>271</a>
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<a name='L279'></a><a href='#L279'>279</a>
<a name='L280'></a><a href='#L280'>280</a>
<a name='L281'></a><a href='#L281'>281</a>
<a name='L282'></a><a href='#L282'>282</a>
<a name='L283'></a><a href='#L283'>283</a>
<a name='L284'></a><a href='#L284'>284</a>
<a name='L285'></a><a href='#L285'>285</a>
<a name='L286'></a><a href='#L286'>286</a>
<a name='L287'></a><a href='#L287'>287</a>
<a name='L288'></a><a href='#L288'>288</a>
<a name='L289'></a><a href='#L289'>289</a>
<a name='L290'></a><a href='#L290'>290</a>
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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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<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">"use strict";
&nbsp;
let parse = require("./parser-sync");
let pack = require("./packer-sync");
&nbsp;
exports.read = function (buffer, options) {
return parse(buffer, options || {});
};
&nbsp;
exports.write = <span class="fstat-no" title="function not covered" >fu</span>nction (png, options) {
<span class="cstat-no" title="statement not covered" > return pack(png, options);</span>
};
&nbsp;</pre></td></tr></table></pre>
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<h1><a href="index.html">All files</a> png.js</h1>
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<span class="strong">54.17% </span>
<span class="quiet">Statements</span>
<span class='fraction'>52/96</span>
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<div class='fl pad1y space-right2'>
<span class="strong">41.18% </span>
<span class="quiet">Branches</span>
<span class='fraction'>14/34</span>
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<div class='fl pad1y space-right2'>
<span class="strong">56.25% </span>
<span class="quiet">Functions</span>
<span class='fraction'>9/16</span>
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<div class='fl pad1y space-right2'>
<span class="strong">56.52% </span>
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<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 util = require("util");
let Stream = require("stream");
let Parser = require("./parser-async");
let Packer = require("./packer-async");
let PNGSync = require("./png-sync");
&nbsp;
let PNG = (exports.PNG = function (options) {
Stream.call(this);
&nbsp;
options = options || {}; // eslint-disable-line no-param-reassign
&nbsp;
// coerce pixel dimensions to integers (also coerces undefined -&gt; 0):
this.width = options.width | 0;
this.height = options.height | 0;
&nbsp;
this.data =
this.width &gt; 0 &amp;&amp; this.height &gt; 0
? Buffer.alloc(4 * this.width * this.height)
: null;
&nbsp;
<span class="missing-if-branch" title="if path not taken" >I</span>if (options.fill &amp;&amp; <span class="branch-1 cbranch-no" title="branch not covered" >this.data)</span> {
<span class="cstat-no" title="statement not covered" > this.data.fill(0);</span>
}
&nbsp;
this.gamma = 0;
this.readable = this.writable = true;
&nbsp;
this._parser = new Parser(options);
&nbsp;
this._parser.on("error", this.emit.bind(this, "error"));
this._parser.on("close", this._handleClose.bind(this));
this._parser.on("metadata", this._metadata.bind(this));
this._parser.on("gamma", this._gamma.bind(this));
this._parser.on(
"parsed",
function (data) {
this.data = data;
this.emit("parsed", data);
}.bind(this)
);
&nbsp;
this._packer = new Packer(options);
this._packer.on("data", this.emit.bind(this, "data"));
this._packer.on("end", this.emit.bind(this, "end"));
this._parser.on("close", this._handleClose.bind(this));
this._packer.on("error", this.emit.bind(this, "error"));
});
util.inherits(PNG, Stream);
&nbsp;
PNG.sync = PNGSync;
&nbsp;
PNG.prototype.pack = function () {
<span class="missing-if-branch" title="if path not taken" >I</span>if (!this.data || !this.data.length) {
<span class="cstat-no" title="statement not covered" > this.emit("error", "No data provided");</span>
<span class="cstat-no" title="statement not covered" > return this;</span>
}
&nbsp;
process.nextTick(
function () {
this._packer.pack(this.data, this.width, this.height, this.gamma);
}.bind(this)
);
&nbsp;
return this;
};
&nbsp;
PNG.prototype.parse = <span class="fstat-no" title="function not covered" >fu</span>nction (data, callback) {
<span class="cstat-no" title="statement not covered" > if (callback) {</span>
let onParsed, onError;
&nbsp;
<span class="cstat-no" title="statement not covered" > onParsed = <span class="fstat-no" title="function not covered" >fu</span>nction (parsedData) {</span>
<span class="cstat-no" title="statement not covered" > this.removeListener("error", onError);</span>
&nbsp;
<span class="cstat-no" title="statement not covered" > this.data = parsedData;</span>
<span class="cstat-no" title="statement not covered" > callback(null, this);</span>
}.bind(this);
&nbsp;
<span class="cstat-no" title="statement not covered" > onError = <span class="fstat-no" title="function not covered" >fu</span>nction (err) {</span>
<span class="cstat-no" title="statement not covered" > this.removeListener("parsed", onParsed);</span>
&nbsp;
<span class="cstat-no" title="statement not covered" > callback(err, null);</span>
}.bind(this);
&nbsp;
<span class="cstat-no" title="statement not covered" > this.once("parsed", onParsed);</span>
<span class="cstat-no" title="statement not covered" > this.once("error", onError);</span>
}
&nbsp;
<span class="cstat-no" title="statement not covered" > this.end(data);</span>
<span class="cstat-no" title="statement not covered" > return this;</span>
};
&nbsp;
PNG.prototype.write = function (data) {
this._parser.write(data);
return true;
};
&nbsp;
PNG.prototype.end = function (data) {
this._parser.end(data);
};
&nbsp;
PNG.prototype._metadata = function (metadata) {
this.width = metadata.width;
this.height = metadata.height;
&nbsp;
this.emit("metadata", metadata);
};
&nbsp;
PNG.prototype._gamma = function (gamma) {
this.gamma = gamma;
};
&nbsp;
PNG.prototype._handleClose = function () {
<span class="missing-if-branch" title="if path not taken" >I</span>if (!this._parser.writable &amp;&amp; !this._packer.readable) {
<span class="cstat-no" title="statement not covered" > this.emit("close");</span>
}
};
&nbsp;
PNG.bitblt = <span class="fstat-no" title="function not covered" >fu</span>nction (src, dst, srcX, srcY, width, height, deltaX, deltaY) {
// eslint-disable-line max-params
// coerce pixel dimensions to integers (also coerces undefined -&gt; 0):
/* eslint-disable no-param-reassign */
<span class="cstat-no" title="statement not covered" > srcX |= 0;</span>
<span class="cstat-no" title="statement not covered" > srcY |= 0;</span>
<span class="cstat-no" title="statement not covered" > width |= 0;</span>
<span class="cstat-no" title="statement not covered" > height |= 0;</span>
<span class="cstat-no" title="statement not covered" > deltaX |= 0;</span>
<span class="cstat-no" title="statement not covered" > deltaY |= 0;</span>
/* eslint-enable no-param-reassign */
&nbsp;
<span class="cstat-no" title="statement not covered" > if (</span>
srcX &gt; src.width ||
srcY &gt; src.height ||
srcX + width &gt; src.width ||
srcY + height &gt; src.height
) {
<span class="cstat-no" title="statement not covered" > throw new Error("bitblt reading outside image");</span>
}
&nbsp;
<span class="cstat-no" title="statement not covered" > if (</span>
deltaX &gt; dst.width ||
deltaY &gt; dst.height ||
deltaX + width &gt; dst.width ||
deltaY + height &gt; dst.height
) {
<span class="cstat-no" title="statement not covered" > throw new Error("bitblt writing outside image");</span>
}
&nbsp;
<span class="cstat-no" title="statement not covered" > for (let y = <span class="cstat-no" title="statement not covered" >0;</span> y &lt; height; y++) {</span>
<span class="cstat-no" title="statement not covered" > src.data.copy(</span>
dst.data,
((deltaY + y) * dst.width + deltaX) &lt;&lt; 2,
((srcY + y) * src.width + srcX) &lt;&lt; 2,
((srcY + y) * src.width + srcX + width) &lt;&lt; 2
);
}
};
&nbsp;
PNG.prototype.bitblt = <span class="fstat-no" title="function not covered" >fu</span>nction (
dst,
srcX,
srcY,
width,
height,
deltaX,
deltaY
) {
// eslint-disable-line max-params
&nbsp;
<span class="cstat-no" title="statement not covered" > PNG.bitblt(this, dst, srcX, srcY, width, height, deltaX, deltaY);</span>
<span class="cstat-no" title="statement not covered" > return this;</span>
};
&nbsp;
PNG.adjustGamma = <span class="fstat-no" title="function not covered" >fu</span>nction (src) {
<span class="cstat-no" title="statement not covered" > if (src.gamma) {</span>
<span class="cstat-no" title="statement not covered" > for (let y = <span class="cstat-no" title="statement not covered" >0;</span> y &lt; src.height; y++) {</span>
<span class="cstat-no" title="statement not covered" > for (let x = <span class="cstat-no" title="statement not covered" >0;</span> x &lt; src.width; x++) {</span>
let idx = <span class="cstat-no" title="statement not covered" >(src.width * y + x) &lt;&lt; 2;</span>
&nbsp;
<span class="cstat-no" title="statement not covered" > for (let i = <span class="cstat-no" title="statement not covered" >0;</span> i &lt; 3; i++) {</span>
let sample = <span class="cstat-no" title="statement not covered" >src.data[idx + i] / 255;</span>
<span class="cstat-no" title="statement not covered" > sample = Math.pow(sample, 1 / 2.2 / src.gamma);</span>
<span class="cstat-no" title="statement not covered" > src.data[idx + i] = Math.round(sample * 255);</span>
}
}
}
<span class="cstat-no" title="statement not covered" > src.gamma = 0;</span>
}
};
&nbsp;
PNG.prototype.adjustGamma = <span class="fstat-no" title="function not covered" >fu</span>nction () {
<span class="cstat-no" title="statement not covered" > PNG.adjustGamma(this);</span>
};
&nbsp;</pre></td></tr></table></pre>
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Code coverage generated by
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/* eslint-disable */
var addSorting = (function () {
"use strict";
var cols,
currentSort = {
index: 0,
desc: false,
};
// returns the summary table element
function getTable() {
return document.querySelector(".coverage-summary");
}
// returns the thead element of the summary table
function getTableHeader() {
return getTable().querySelector("thead tr");
}
// returns the tbody element of the summary table
function getTableBody() {
return getTable().querySelector("tbody");
}
// returns the th element for nth column
function getNthColumn(n) {
return getTableHeader().querySelectorAll("th")[n];
}
// loads all columns
function loadColumns() {
var colNodes = getTableHeader().querySelectorAll("th"),
colNode,
cols = [],
col,
i;
for (i = 0; i < colNodes.length; i += 1) {
colNode = colNodes[i];
col = {
key: colNode.getAttribute("data-col"),
sortable: !colNode.getAttribute("data-nosort"),
type: colNode.getAttribute("data-type") || "string",
};
cols.push(col);
if (col.sortable) {
col.defaultDescSort = col.type === "number";
colNode.innerHTML = colNode.innerHTML + '<span class="sorter"></span>';
}
}
return cols;
}
// attaches a data attribute to every tr element with an object
// of data values keyed by column name
function loadRowData(tableRow) {
var tableCols = tableRow.querySelectorAll("td"),
colNode,
col,
data = {},
i,
val;
for (i = 0; i < tableCols.length; i += 1) {
colNode = tableCols[i];
col = cols[i];
val = colNode.getAttribute("data-value");
if (col.type === "number") {
val = Number(val);
}
data[col.key] = val;
}
return data;
}
// loads all row data
function loadData() {
var rows = getTableBody().querySelectorAll("tr"),
i;
for (i = 0; i < rows.length; i += 1) {
rows[i].data = loadRowData(rows[i]);
}
}
// sorts the table using the data for the ith column
function sortByIndex(index, desc) {
var key = cols[index].key,
sorter = function (a, b) {
a = a.data[key];
b = b.data[key];
return a < b ? -1 : a > b ? 1 : 0;
},
finalSorter = sorter,
tableBody = document.querySelector(".coverage-summary tbody"),
rowNodes = tableBody.querySelectorAll("tr"),
rows = [],
i;
if (desc) {
finalSorter = function (a, b) {
return -1 * sorter(a, b);
};
}
for (i = 0; i < rowNodes.length; i += 1) {
rows.push(rowNodes[i]);
tableBody.removeChild(rowNodes[i]);
}
rows.sort(finalSorter);
for (i = 0; i < rows.length; i += 1) {
tableBody.appendChild(rows[i]);
}
}
// removes sort indicators for current column being sorted
function removeSortIndicators() {
var col = getNthColumn(currentSort.index),
cls = col.className;
cls = cls.replace(/ sorted$/, "").replace(/ sorted-desc$/, "");
col.className = cls;
}
// adds sort indicators for current column being sorted
function addSortIndicators() {
getNthColumn(currentSort.index).className += currentSort.desc
? " sorted-desc"
: " sorted";
}
// adds event listeners for all sorter widgets
function enableUI() {
var i,
el,
ithSorter = function ithSorter(i) {
var col = cols[i];
return function () {
var desc = col.defaultDescSort;
if (currentSort.index === i) {
desc = !currentSort.desc;
}
sortByIndex(i, desc);
removeSortIndicators();
currentSort.index = i;
currentSort.desc = desc;
addSortIndicators();
};
};
for (i = 0; i < cols.length; i += 1) {
if (cols[i].sortable) {
// add the click event handler on the th so users
// dont have to click on those tiny arrows
el = getNthColumn(i).querySelector(".sorter").parentElement;
if (el.addEventListener) {
el.addEventListener("click", ithSorter(i));
} else {
el.attachEvent("onclick", ithSorter(i));
}
}
}
}
// adds sorting functionality to the UI
return function () {
if (!getTable()) {
return;
}
cols = loadColumns();
loadData();
addSortIndicators();
enableUI();
};
})();
window.addEventListener("load", addSorting);

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<pre><table class="coverage">
<tr><td class="line-count quiet"><a name='L1'></a><a href='#L1'>1</a>
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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 assert = require("assert").ok;
let zlib = require("zlib");
let util = require("util");
&nbsp;
let kMaxLength = require("buffer").kMaxLength;
&nbsp;
function Inflate(opts) {
<span class="missing-if-branch" title="if path not taken" >I</span>if (!(this instanceof Inflate)) {
<span class="cstat-no" title="statement not covered" > return new Inflate(opts);</span>
}
&nbsp;
if (opts &amp;&amp; opts.chunkSize &lt; zlib.Z_MIN_CHUNK) {
opts.chunkSize = zlib.Z_MIN_CHUNK;
}
&nbsp;
zlib.Inflate.call(this, opts);
&nbsp;
// Node 8 --&gt; 9 compatibility check
this._offset = this._offset === undefined ? this._outOffset : <span class="branch-1 cbranch-no" title="branch not covered" >this._offset;</span>
this._buffer = this._buffer || this._outBuffer;
&nbsp;
<span class="missing-if-branch" title="else path not taken" >E</span>if (opts &amp;&amp; opts.maxLength != null) {
this._maxLength = opts.maxLength;
}
}
&nbsp;
function <span class="fstat-no" title="function not covered" >createInflate(</span>opts) {
<span class="cstat-no" title="statement not covered" > return new Inflate(opts);</span>
}
&nbsp;
function _close(engine, callback) {
<span class="missing-if-branch" title="if path not taken" >I</span>if (callback) {
<span class="cstat-no" title="statement not covered" > process.nextTick(callback);</span>
}
&nbsp;
// Caller may invoke .close after a zlib error (which will null _handle).
<span class="missing-if-branch" title="if path not taken" >I</span>if (!engine._handle) {
<span class="cstat-no" title="statement not covered" > return;</span>
}
&nbsp;
engine._handle.close();
engine._handle = null;
}
&nbsp;
Inflate.prototype._processChunk = function (chunk, flushFlag, asyncCb) {
<span class="missing-if-branch" title="if path not taken" >I</span>if (typeof asyncCb === "function") {
<span class="cstat-no" title="statement not covered" > return zlib.Inflate._processChunk.call(this, chunk, flushFlag, asyncCb);</span>
}
&nbsp;
let self = this;
&nbsp;
let availInBefore = chunk &amp;&amp; chunk.length;
let availOutBefore = this._chunkSize - this._offset;
let leftToInflate = this._maxLength;
let inOff = 0;
&nbsp;
let buffers = [];
let nread = 0;
&nbsp;
let error;
this.on("error", function (err) {
error = err;
});
&nbsp;
function handleChunk(availInAfter, availOutAfter) {
<span class="missing-if-branch" title="if path not taken" >I</span>if (self._hadError) {
<span class="cstat-no" title="statement not covered" > return;</span>
}
&nbsp;
let have = availOutBefore - availOutAfter;
assert(have &gt;= 0, "have should not go down");
&nbsp;
<span class="missing-if-branch" title="else path not taken" >E</span>if (have &gt; 0) {
let out = self._buffer.slice(self._offset, self._offset + have);
self._offset += have;
&nbsp;
if (out.length &gt; leftToInflate) {
out = out.slice(0, leftToInflate);
}
&nbsp;
buffers.push(out);
nread += out.length;
leftToInflate -= out.length;
&nbsp;
<span class="missing-if-branch" title="else path not taken" >E</span>if (leftToInflate === 0) {
return false;
}
}
&nbsp;
<span class="cstat-no" title="statement not covered" > if (availOutAfter === 0 || self._offset &gt;= self._chunkSize) {</span>
<span class="cstat-no" title="statement not covered" > availOutBefore = self._chunkSize;</span>
<span class="cstat-no" title="statement not covered" > self._offset = 0;</span>
<span class="cstat-no" title="statement not covered" > self._buffer = Buffer.allocUnsafe(self._chunkSize);</span>
}
&nbsp;
<span class="cstat-no" title="statement not covered" > if (availOutAfter === 0) {</span>
<span class="cstat-no" title="statement not covered" > inOff += availInBefore - availInAfter;</span>
<span class="cstat-no" title="statement not covered" > availInBefore = availInAfter;</span>
&nbsp;
<span class="cstat-no" title="statement not covered" > return true;</span>
}
&nbsp;
<span class="cstat-no" title="statement not covered" > return false;</span>
}
&nbsp;
assert(this._handle, "zlib binding closed");
let res;
do {
res = this._handle.writeSync(
flushFlag,
chunk, // in
inOff, // in_off
availInBefore, // in_len
this._buffer, // out
this._offset, //out_off
availOutBefore
); // out_len
// Node 8 --&gt; 9 compatibility check
res = res || this._writeState;
} while (!this._hadError &amp;&amp; handleChunk(res[0], res[1]));
&nbsp;
if (this._hadError) {
throw error;
}
&nbsp;
<span class="missing-if-branch" title="if path not taken" >I</span>if (nread &gt;= kMaxLength) {
<span class="cstat-no" title="statement not covered" > _close(this);</span>
<span class="cstat-no" title="statement not covered" > throw new RangeError(</span>
"Cannot create final Buffer. It would be larger than 0x" +
kMaxLength.toString(16) +
" bytes"
);
}
&nbsp;
let buf = Buffer.concat(buffers, nread);
_close(this);
&nbsp;
return buf;
};
&nbsp;
util.inherits(Inflate, zlib.Inflate);
&nbsp;
function zlibBufferSync(engine, buffer) {
<span class="missing-if-branch" title="if path not taken" >I</span>if (typeof buffer === "string") {
<span class="cstat-no" title="statement not covered" > buffer = Buffer.from(buffer);</span>
}
<span class="missing-if-branch" title="if path not taken" >I</span>if (!(buffer instanceof Buffer)) {
<span class="cstat-no" title="statement not covered" > throw new TypeError("Not a string or buffer");</span>
}
&nbsp;
let flushFlag = engine._finishFlushFlag;
<span class="missing-if-branch" title="if path not taken" >I</span>if (flushFlag == null) {
<span class="cstat-no" title="statement not covered" > flushFlag = zlib.Z_FINISH;</span>
}
&nbsp;
return engine._processChunk(buffer, flushFlag);
}
&nbsp;
function inflateSync(buffer, opts) {
return zlibBufferSync(new Inflate(opts), buffer);
}
&nbsp;
module.exports = exports = inflateSync;
exports.Inflate = Inflate;
exports.createInflate = createInflate;
exports.inflateSync = inflateSync;
&nbsp;</pre></td></tr></table></pre>
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<div class='clearfix'>
<div class='fl pad1y space-right2'>
<span class="strong">88.89% </span>
<span class="quiet">Statements</span>
<span class='fraction'>16/18</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">72.73% </span>
<span class="quiet">Branches</span>
<span class='fraction'>8/11</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">100% </span>
<span class="quiet">Functions</span>
<span class='fraction'>3/3</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">88.89% </span>
<span class="quiet">Lines</span>
<span class='fraction'>16/18</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">
<tr><td class="line-count quiet"><a name='L1'></a><a href='#L1'>1</a>
<a name='L2'></a><a href='#L2'>2</a>
<a name='L3'></a><a href='#L3'>3</a>
<a name='L4'></a><a href='#L4'>4</a>
<a name='L5'></a><a href='#L5'>5</a>
<a name='L6'></a><a href='#L6'>6</a>
<a name='L7'></a><a href='#L7'>7</a>
<a name='L8'></a><a href='#L8'>8</a>
<a name='L9'></a><a href='#L9'>9</a>
<a name='L10'></a><a href='#L10'>10</a>
<a name='L11'></a><a href='#L11'>11</a>
<a name='L12'></a><a href='#L12'>12</a>
<a name='L13'></a><a href='#L13'>13</a>
<a name='L14'></a><a href='#L14'>14</a>
<a name='L15'></a><a href='#L15'>15</a>
<a name='L16'></a><a href='#L16'>16</a>
<a name='L17'></a><a href='#L17'>17</a>
<a name='L18'></a><a href='#L18'>18</a>
<a name='L19'></a><a href='#L19'>19</a>
<a name='L20'></a><a href='#L20'>20</a>
<a name='L21'></a><a href='#L21'>21</a>
<a name='L22'></a><a href='#L22'>22</a>
<a name='L23'></a><a href='#L23'>23</a>
<a name='L24'></a><a href='#L24'>24</a>
<a name='L25'></a><a href='#L25'>25</a>
<a name='L26'></a><a href='#L26'>26</a>
<a name='L27'></a><a href='#L27'>27</a>
<a name='L28'></a><a href='#L28'>28</a>
<a name='L29'></a><a href='#L29'>29</a>
<a name='L30'></a><a href='#L30'>30</a>
<a name='L31'></a><a href='#L31'>31</a>
<a name='L32'></a><a href='#L32'>32</a>
<a name='L33'></a><a href='#L33'>33</a>
<a name='L34'></a><a href='#L34'>34</a>
<a name='L35'></a><a href='#L35'>35</a>
<a name='L36'></a><a href='#L36'>36</a>
<a name='L37'></a><a href='#L37'>37</a>
<a name='L38'></a><a href='#L38'>38</a>
<a name='L39'></a><a href='#L39'>39</a>
<a name='L40'></a><a href='#L40'>40</a>
<a name='L41'></a><a href='#L41'>41</a>
<a name='L42'></a><a href='#L42'>42</a>
<a name='L43'></a><a href='#L43'>43</a>
<a name='L44'></a><a href='#L44'>44</a>
<a name='L45'></a><a href='#L45'>45</a>
<a name='L46'></a><a href='#L46'>46</a></td><td class="line-coverage quiet"><span class="cline-any cline-neutral">&nbsp;</span>
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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 SyncReader = (module.exports = function (buffer) {
this._buffer = buffer;
this._reads = [];
});
&nbsp;
SyncReader.prototype.read = function (length, callback) {
this._reads.push({
length: Math.abs(length), // if length &lt; 0 then at most this length
allowLess: length &lt; 0,
func: callback,
});
};
&nbsp;
SyncReader.prototype.process = function () {
// as long as there is any data and read requests
while (this._reads.length &gt; 0 &amp;&amp; this._buffer.length) {
let read = this._reads[0];
&nbsp;
<span class="missing-if-branch" title="else path not taken" >E</span>if (
this._buffer.length &amp;&amp;
(this._buffer.length &gt;= read.length || <span class="branch-2 cbranch-no" title="branch not covered" >read.allowLess)</span>
) {
// ok there is any data so that we can satisfy this request
this._reads.shift(); // == read
&nbsp;
let buf = this._buffer;
&nbsp;
this._buffer = buf.slice(read.length);
&nbsp;
read.func.call(this, buf.slice(0, read.length));
} else {
<span class="cstat-no" title="statement not covered" > break;</span>
}
}
&nbsp;
<span class="missing-if-branch" title="if path not taken" >I</span>if (this._reads.length &gt; 0) {
<span class="cstat-no" title="statement not covered" > return new Error("There are some read requests waitng on finished stream");</span>
}
&nbsp;
if (this._buffer.length &gt; 0) {
return new Error("unrecognised content at end of stream");
}
};
&nbsp;</pre></td></tr></table></pre>
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at Fri Apr 10 2020 13:53:16 GMT+0200 (Central European Summer Time)
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