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// Get the appropriate flag to use for creating files

// We use fmap on Windows platforms for files less than

// 512kb.  This is a fairly low limit, but avoids making

// things slower in some cases.  Since most of what this

// library is used for is extracting tarballs of many

// relatively small files in npm packages and the like,

// it can be a big boost on Windows platforms.

// Only supported in Node v12.9.0 and above.

const platform = process.env.__FAKE_PLATFORM__ || process.platform

const fs = global.__FAKE_TESTING_FS__ || require('fs')

const { O_CREAT, O_TRUNC, O_WRONLY, UV_FS_O_FILEMAP = 0 } = fs.constants

const fMapEnabled = isWindows && !!UV_FS_O_FILEMAP

const fMapFlag = UV_FS_O_FILEMAP | O_TRUNC | O_CREAT | O_WRONLY

module.exports = !fMapEnabled ? () => 'w'

  : size => size < fMapLimit ? fMapFlag : 'w'

// Technically, this is a transform stream that you write paths into,

// The `add()` method is like `write()` but returns this,

// and end() return `this` as well, so you can

// do `new Pack(opt).add('files').add('dir').end().pipe(output)

// streamOfPaths().pipe(new Pack()).pipe(new fs.WriteStream('out.tar'))

const ReadEntry = require('./read-entry.js')

const WriteEntry = require('./write-entry.js')

const ADDTARENTRY = Symbol('addTarEntry')

const WRITEENTRYCLASS = Symbol('writeEntryClass')

const warner = require('./warn-mixin.js')

const Pack = warner(class Pack extends MiniPass {

    this.preservePaths = !!opt.preservePaths

    this.prefix = (opt.prefix || '').replace(/(\\|\/)+$/, '')

    this.linkCache = opt.linkCache || new Map()

    this.statCache = opt.statCache || new Map()

    this.readdirCache = opt.readdirCache || new Map()

    if (typeof opt.onwarn === 'function')

      this.zip.on('data', chunk => super.write(chunk))

      this.zip.on('end', _ => super.end())

      this.zip.on('drain', _ => this[ONDRAIN]())

      this.on('resume', _ => this.zip.resume())

    this.noDirRecurse = !!opt.noDirRecurse

    this.filter = typeof opt.filter === 'function' ? opt.filter : _ => true

    const absolute = path.resolve(this.cwd, p.path)

      p.path = this.prefix + '/' + p.path.replace(/^\.(\/+|$)/, '')

    // in this case, we don't have to wait for the stat

      const job = new PackJob(p.path, absolute, false)

      job.entry = new WriteEntryTar(p, this[ENTRYOPT](job))

      job.entry.on('end', _ => this[JOBDONE](job))

    const absolute = path.resolve(this.cwd, p)

      p = this.prefix + '/' + p.replace(/^\.(\/+|$)/, '')

    this[QUEUE].push(new PackJob(p, absolute))

    const stat = this.follow ? 'stat' : 'lstat'

    fs[stat](job.absolute, (er, stat) => {

    this.statCache.set(job.absolute, stat)

    // now we have the stat, we can filter it.

    fs.readdir(job.absolute, (er, entries) => {

  "author": "Isaac Z. Schlueter <i@izs.me> (http://blog.izs.me/)",

    "url": "https://github.com/npm/node-tar.git"

    "postpublish": "git push origin --follow-tags",

    "genparse": "node scripts/generate-parse-fixtures.js",

    "bench": "for i in benchmarks/*/*.js; do echo $i; for j in {1..5}; do node $i || break; done; done"

		@@ -11,4 +11,7 @@ // Get the appropriate flag to use for creating files
		const isWindows = platform === 'win32'
		const fs = require('fs')
		const fs = global.__FAKE_TESTING_FS__ \|\| require('fs')

		/* istanbul ignore next */
		const { O_CREAT, O_TRUNC, O_WRONLY, UV_FS_O_FILEMAP = 0 } = fs.constants

		const fMapEnabled = isWindows && !!UV_FS_O_FILEMAP
		@@ -15,0 +18,0 @@ const fMapLimit = 512 * 1024

		@@ -78,2 +78,3 @@ 'use strict'

		this.portable = !!opt.portable
		this.zip = null
		@@ -83,2 +84,4 @@ if (opt.gzip) {
		opt.gzip = {}
		if (this.portable)
		opt.gzip.portable = true
		this.zip = new zlib.Gzip(opt.gzip)
		@@ -92,3 +95,2 @@ this.zip.on('data', chunk => super.write(chunk))

		this.portable = !!opt.portable
		this.noDirRecurse = !!opt.noDirRecurse
		@@ -95,0 +97,0 @@ this.follow = !!opt.follow

		@@ -5,3 +5,3 @@ {
		"description": "tar for node",
		"version": "5.0.4",
		"version": "5.0.5",
		"repository": {
		@@ -23,3 +23,3 @@ "type": "git",
		"minipass": "^3.0.0",
		"minizlib": "^2.0.0",
		"minizlib": "^2.1.0",
		"mkdirp": "^0.5.0",
		@@ -26,0 +26,0 @@ "yallist": "^4.0.0"

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