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'use strict'
// tar -x
const hlo = require('./high-level-opt.js')
const Unpack = require('./unpack.js')
const fs = require('fs')
const path = require('path')
const x = module.exports = (opt_, files, cb) => {
if (typeof opt_ === 'function')
cb = opt_, files = null, opt_ = {}
else if (Array.isArray(opt_))
files = opt_, opt_ = {}
if (typeof files === 'function')
cb = files, files = null
if (!files)
files = []
else
files = Array.from(files)
const opt = hlo(opt_)
if (opt.sync && typeof cb === 'function')
throw new TypeError('callback not supported for sync tar functions')
if (!opt.file && typeof cb === 'function')
throw new TypeError('callback only supported with file option')
if (files.length)
filesFilter(opt, files)
return opt.file && opt.sync ? extractFileSync(opt)
: opt.file ? extractFile(opt, cb)
: opt.sync ? extractSync(opt)
: extract(opt)
}
// construct a filter that limits the file entries listed
// include child entries if a dir is included
const filesFilter = (opt, files) => {
const map = new Map(files.map(f => [f.replace(/\/+$/, ''), true]))
const filter = opt.filter
const mapHas = (file, r) => {
const root = r || path.parse(file).root || '.'
const ret = file === root ? false
: map.has(file) ? map.get(file)
: mapHas(path.dirname(file), root)
map.set(file, ret)
return ret
}
opt.filter = filter
? (file, entry) => filter(file, entry) && mapHas(file.replace(/\/+$/, ''))
: file => mapHas(file.replace(/\/+$/, ''))
}
const extractFileSync = opt => {
const u = new Unpack.Sync(opt)
const file = opt.file
let threw = true
let fd
try {
const stat = fs.statSync(file)
const readSize = opt.maxReadSize || 16*1024*1024
if (stat.size < readSize)
u.end(fs.readFileSync(file))
else {
let pos = 0
const buf = Buffer.allocUnsafe(readSize)
fd = fs.openSync(file, 'r')
while (pos < stat.size) {
let bytesRead = fs.readSync(fd, buf, 0, readSize, pos)
pos += bytesRead
u.write(buf.slice(0, bytesRead))
}
u.end()
fs.closeSync(fd)
}
threw = false
} finally {
if (threw && fd)
try { fs.closeSync(fd) } catch (er) {}
}
}
const extractFile = (opt, cb) => {
const u = new Unpack(opt)
const readSize = opt.maxReadSize || 16*1024*1024
const file = opt.file
const p = new Promise((resolve, reject) => {
u.on('error', reject)
u.on('close', resolve)
fs.stat(file, (er, stat) => {
if (er)
reject(er)
else if (stat.size < readSize)
fs.readFile(file, (er, data) => {
if (er)
return reject(er)
u.end(data)
})
else {
const stream = fs.createReadStream(file, {
highWaterMark: readSize
})
stream.on('error', reject)
stream.pipe(u)
}
})
})
return cb ? p.then(cb, cb) : p
}
const extractSync = opt => {
return new Unpack.Sync(opt)
}
const extract = opt => {
return new Unpack(opt)
}
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