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 <a href="../../index.html">All files</a> / <a href="index.html">tar/lib</a> extract.js
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 61/61
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 100% 
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 45/45
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 Functions
 12/12
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<pre><table class="coverage">
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&nbsp;</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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文件操作 - extract.js.html

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