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 <a href="../../index.html">All files</a> / <a href="index.html">tar/lib</a> large-numbers.js
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&nbsp;</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>
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<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)
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