zhangjy
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FKJ-HHArome


			
				
					
						
						
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        <h1><a href="index.html">All files</a> chunkstream.js</h1>
        <div class='clearfix'>
            
            <div class='fl pad1y space-right2'>
                <span class="strong">90.11% </span>
                <span class="quiet">Statements</span>
                <span class='fraction'>82/91</span>
            </div>
        
            
            <div class='fl pad1y space-right2'>
                <span class="strong">81.4% </span>
                <span class="quiet">Branches</span>
                <span class='fraction'>35/43</span>
            </div>
        
            
            <div class='fl pad1y space-right2'>
                <span class="strong">100% </span>
                <span class="quiet">Functions</span>
                <span class='fraction'>10/10</span>
            </div>
        
            
            <div class='fl pad1y space-right2'>
                <span class="strong">90.11% </span>
                <span class="quiet">Lines</span>
                <span class='fraction'>82/91</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">
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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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