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<a href="../../index.html">All files</a> / <a href="index.html">tar/lib</a> extract.js
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<div class='fl pad1y space-right2'>
<span class="strong">100% </span>
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<span class="strong">100% </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;
// tar -x
const hlo = require('./high-level-opt.js')
const Unpack = require('./unpack.js')
const fs = require('fs')
const fsm = require('fs-minipass')
const path = require('path')
&nbsp;
const x = module.exports = (opt_, files, cb) =&gt; {
if (typeof opt_ === 'function')
cb = opt_, files = null, opt_ = {}
else if (Array.isArray(opt_))
files = opt_, opt_ = {}
&nbsp;
if (typeof files === 'function')
cb = files, files = null
&nbsp;
if (!files)
files = []
else
files = Array.from(files)
&nbsp;
const opt = hlo(opt_)
&nbsp;
if (opt.sync &amp;&amp; typeof cb === 'function')
throw new TypeError('callback not supported for sync tar functions')
&nbsp;
if (!opt.file &amp;&amp; typeof cb === 'function')
throw new TypeError('callback only supported with file option')
&nbsp;
if (files.length)
filesFilter(opt, files)
&nbsp;
return opt.file &amp;&amp; opt.sync ? extractFileSync(opt)
: opt.file ? extractFile(opt, cb)
: opt.sync ? extractSync(opt)
: extract(opt)
}
&nbsp;
// construct a filter that limits the file entries listed
// include child entries if a dir is included
const filesFilter = (opt, files) =&gt; {
const map = new Map(files.map(f =&gt; [f.replace(/\/+$/, ''), true]))
const filter = opt.filter
&nbsp;
const mapHas = (file, r) =&gt; {
const root = r || path.parse(file).root || '.'
const ret = file === root ? false
: map.has(file) ? map.get(file)
: mapHas(path.dirname(file), root)
&nbsp;
map.set(file, ret)
return ret
}
&nbsp;
opt.filter = filter
? (file, entry) =&gt; filter(file, entry) &amp;&amp; mapHas(file.replace(/\/+$/, ''))
: file =&gt; mapHas(file.replace(/\/+$/, ''))
}
&nbsp;
const extractFileSync = opt =&gt; {
const u = new Unpack.Sync(opt)
&nbsp;
const file = opt.file
let threw = true
let fd
const stat = fs.statSync(file)
// This trades a zero-byte read() syscall for a stat
// However, it will usually result in less memory allocation
const readSize = opt.maxReadSize || 16*1024*1024
const stream = new fsm.ReadStreamSync(file, {
readSize: readSize,
size: stat.size
})
stream.pipe(u)
}
&nbsp;
const extractFile = (opt, cb) =&gt; {
const u = new Unpack(opt)
const readSize = opt.maxReadSize || 16*1024*1024
&nbsp;
const file = opt.file
const p = new Promise((resolve, reject) =&gt; {
u.on('error', reject)
u.on('close', resolve)
&nbsp;
// This trades a zero-byte read() syscall for a stat
// However, it will usually result in less memory allocation
fs.stat(file, (er, stat) =&gt; {
if (er)
reject(er)
else {
const stream = new fsm.ReadStream(file, {
readSize: readSize,
size: stat.size
})
stream.on('error', reject)
stream.pipe(u)
}
})
})
return cb ? p.then(cb, cb) : p
}
&nbsp;
const extractSync = opt =&gt; {
return new Unpack.Sync(opt)
}
&nbsp;
const extract = opt =&gt; {
return new Unpack(opt)
}
&nbsp;</pre></td></tr>
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