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node_modules/pngjs/coverage/lcov-report/lib/chunkstream.js.html
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<title>Code coverage report for lib\chunkstream.js</title>
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<div class="header high">
<h1>Code coverage report for <span class="entity">lib\chunkstream.js</span></h1>
<h2>
Statements: <span class="metric">85% <small>(68 / 80)</small></span> &nbsp;&nbsp;&nbsp;&nbsp;
Branches: <span class="metric">77.27% <small>(34 / 44)</small></span> &nbsp;&nbsp;&nbsp;&nbsp;
Functions: <span class="metric">100% <small>(8 / 8)</small></span> &nbsp;&nbsp;&nbsp;&nbsp;
Lines: <span class="metric">87.01% <small>(67 / 77)</small></span> &nbsp;&nbsp;&nbsp;&nbsp;
Ignored: <span class="metric"><span class="ignore-none">none</span></span> &nbsp;&nbsp;&nbsp;&nbsp;
</h2>
<div class="path"><a href="../index.html">All files</a> &#187; <a href="index.html">lib/</a> &#187; chunkstream.js</div>
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<div class="body">
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<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">// Copyright (c) 2012 Kuba Niegowski
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
&nbsp;
'use strict';
&nbsp;
&nbsp;
var util = require('util'),
Stream = require('stream');
&nbsp;
&nbsp;
var 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;
&nbsp;
ChunkStream.prototype.read = function(length, callback) {
&nbsp;
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) {
&nbsp;
<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;
<span class="missing-if-branch" title="if path not taken" >I</span>if (!Buffer.isBuffer(data))
<span class="cstat-no" title="statement not covered" > data = new Buffer(data, encoding || this._encoding);</span>
&nbsp;
this._buffers.push(data);
this._buffered += data.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) {
&nbsp;
<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
if (!this._buffers) return;
&nbsp;
// enqueue or handle end
<span class="missing-if-branch" title="if path not taken" >I</span>if (this._buffers.length == 0) {
<span class="cstat-no" title="statement not covered" > this._end();</span>
} else {
this._buffers.push(null);
this._process();
}
};
&nbsp;
ChunkStream.prototype.destroySoon = ChunkStream.prototype.end;
&nbsp;
ChunkStream.prototype._end = function() {
&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" > this.emit('error',</span>
new Error('There are some read requests waitng on finished stream')
);
}
&nbsp;
this.destroy();
};
&nbsp;
ChunkStream.prototype.destroy = function() {
&nbsp;
<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._process = function() {
&nbsp;
// 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) {
&nbsp;
var read = this._reads[0];
&nbsp;
// read any data (but no more than length)
if (read.allowLess) {
&nbsp;
// 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
var buf = this._buffers[0];
&nbsp;
// ok there is more data than we need
<span class="missing-if-branch" title="else path not taken" >E</span>if (buf.length &gt; read.length) {
&nbsp;
this._buffered -= read.length;
this._buffers[0] = buf.slice(read.length);
&nbsp;
read.func.call(this, buf.slice(0, read.length));
&nbsp;
} else {
// ok this is less than maximum length so use it all
<span class="cstat-no" title="statement not covered" > this._buffered -= buf.length;</span>
<span class="cstat-no" title="statement not covered" > this._buffers.shift(); </span>// == buf
&nbsp;
<span class="cstat-no" title="statement not covered" > read.func.call(this, buf);</span>
}
&nbsp;
} else if (this._buffered &gt;= read.length) {
// ok we can meet some expectations
&nbsp;
this._reads.shift(); // == read
&nbsp;
var pos = 0,
count = 0,
data = new Buffer(read.length);
&nbsp;
// create buffer for all data
while (pos &lt; read.length) {
&nbsp;
var buf = this._buffers[count++],
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;
} 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._buffers.length &gt; 0 &amp;&amp; this._buffers[0] == null) {
this._end();
}
};
&nbsp;</pre></td></tr>
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