xiaojincai
/
yrxzy


			
				
					
						
						
							123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342
							<!doctype html>
<html lang="en">
<head>
    <title>Code coverage report for tar/lib/large-numbers.js</title>
    <meta charset="utf-8" />
    <link rel="stylesheet" href="../../prettify.css" />
    <link rel="stylesheet" href="../../base.css" />
    <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> / <a href="index.html">tar/lib</a> large-numbers.js
    </h1>
    <div class='clearfix'>
      <div class='fl pad1y space-right2'>
        <span class="strong">100% </span>
        <span class="quiet">Statements</span>
        <span class='fraction'>59/59</span>
      </div>
      <div class='fl pad1y space-right2'>
        <span class="strong">100% </span>
        <span class="quiet">Branches</span>
        <span class='fraction'>20/20</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">100% </span>
        <span class="quiet">Lines</span>
        <span class='fraction'>57/57</span>
      </div>
    </div>
  </div>
  <div class='status-line high'></div>
<pre><table class="coverage">
<tr><td class="line-count quiet">1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93</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-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">14x</span>
<span class="cline-any cline-yes">17x</span>
<span class="cline-any cline-yes">17x</span>
<span class="cline-any cline-yes">6x</span>
<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-yes">11x</span>
<span class="cline-any cline-yes">17x</span>
<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-yes">14x</span>
<span class="cline-any cline-yes">11x</span>
<span class="cline-any cline-yes">11x</span>
<span class="cline-any cline-yes">86x</span>
<span class="cline-any cline-yes">31x</span>
<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-yes">55x</span>
<span class="cline-any cline-yes">55x</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">14x</span>
<span class="cline-any cline-yes">6x</span>
<span class="cline-any cline-yes">6x</span>
<span class="cline-any cline-yes">6x</span>
<span class="cline-any cline-yes">6x</span>
<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-yes">60x</span>
<span class="cline-any cline-yes">42x</span>
<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-yes">18x</span>
<span class="cline-any cline-yes">18x</span>
<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-yes">60x</span>
<span class="cline-any cline-yes">48x</span>
<span class="cline-any cline-yes">12x</span>
<span class="cline-any cline-yes">6x</span>
<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-yes">6x</span>
<span class="cline-any cline-yes">6x</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">14x</span>
<span class="cline-any cline-yes">47x</span>
<span class="cline-any cline-yes">47x</span>
<span class="cline-any cline-yes">47x</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">14x</span>
<span class="cline-any cline-yes">6x</span>
<span class="cline-any cline-yes">6x</span>
<span class="cline-any cline-yes">6x</span>
<span class="cline-any cline-yes">6x</span>
<span class="cline-any cline-yes">60x</span>
<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-yes">60x</span>
<span class="cline-any cline-yes">48x</span>
<span class="cline-any cline-yes">12x</span>
<span class="cline-any cline-yes">6x</span>
<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-yes">6x</span>
<span class="cline-any cline-yes">6x</span>
<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-yes">60x</span>
<span class="cline-any cline-yes">12x</span>
<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-yes">6x</span>
<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-yes">14x</span>
<span class="cline-any cline-yes">41x</span>
<span class="cline-any cline-yes">41x</span>
<span class="cline-any cline-yes">41x</span>
<span class="cline-any cline-yes">266x</span>
<span class="cline-any cline-yes">266x</span>
<span class="cline-any cline-yes">161x</span>
<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-yes">41x</span>
<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-yes">96x</span>
<span class="cline-any cline-neutral">&nbsp;</span>
<span class="cline-any cline-yes">14x</span>
<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">'use strict'
// Tar can encode large and negative numbers using a leading byte of
// 0xff for negative, and 0x80 for positive.  The trailing byte in the
// section will always be 0x20, or in some implementations 0x00.
// this module encodes and decodes these things.
&nbsp;
const encode = exports.encode = (num, buf) =&gt; {
  buf[buf.length - 1] = 0x20
  if (num &lt; 0)
    encodeNegative(num, buf)
  else
    encodePositive(num, buf)
  return buf
}
&nbsp;
const encodePositive = (num, buf) =&gt; {
  buf[0] = 0x80
  for (var i = buf.length - 2; i &gt; 0; i--) {
    if (num === 0)
      buf[i] = 0
    else {
      buf[i] = num % 0x100
      num = Math.floor(num / 0x100)
    }
  }
}
&nbsp;
const encodeNegative = (num, buf) =&gt; {
  buf[0] = 0xff
  var flipped = false
  num = num * -1
  for (var i = buf.length - 2; i &gt; 0; i--) {
    var byte
    if (num === 0)
      byte = 0
    else {
      byte = num % 0x100
      num = Math.floor(num / 0x100)
    }
    if (flipped)
      buf[i] = onesComp(byte)
    else if (byte === 0)
      buf[i] = 0
    else {
      flipped = true
      buf[i] = twosComp(byte)
    }
  }
}
&nbsp;
const parse = exports.parse = (buf) =&gt; {
  var post = buf[buf.length - 1]
  var pre = buf[0]
  return pre === 0x80 ? pos(buf.slice(1, buf.length - 1))
   : twos(buf.slice(1, buf.length - 1))
}
&nbsp;
const twos = (buf) =&gt; {
  var len = buf.length
  var sum = 0
  var flipped = false
  for (var i = len - 1; i &gt; -1; i--) {
    var byte = buf[i]
    var f
    if (flipped)
      f = onesComp(byte)
    else if (byte === 0)
      f = byte
    else {
      flipped = true
      f = twosComp(byte)
    }
    if (f !== 0)
      sum += f * Math.pow(256, len - i - 1)
  }
  return sum * -1
}
&nbsp;
const pos = (buf) =&gt; {
  var len = buf.length
  var sum = 0
  for (var i = len - 1; i &gt; -1; i--) {
    var byte = buf[i]
    if (byte !== 0)
      sum += byte * Math.pow(256, len - i - 1)
  }
  return sum
}
&nbsp;
const onesComp = byte =&gt; (0xff ^ byte) &amp; 0xff
&nbsp;
const twosComp = byte =&gt; ((0xff ^ byte) + 1) &amp; 0xff
&nbsp;</pre></td></tr>
</table></pre>
<div class='push'></div><!-- for sticky footer -->
</div><!-- /wrapper -->
<div class='footer quiet pad2 space-top1 center small'>
  Code coverage
  generated by <a href="https://istanbul.js.org/" target="_blank">istanbul</a> at Mon Nov 20 2017 16:00:38 GMT-0800 (PST)
</div>
</div>
<script src="../../prettify.js"></script>
<script>
window.onload = function () {
        if (typeof prettyPrint === 'function') {
            prettyPrint();
        }
};
</script>
<script src="../../sorter.js"></script>
</body>
</html>