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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 fsm = require('fs-minipass') const path = require('path') const stripSlash = require('./strip-trailing-slashes.js') 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 => [stripSlash(f), 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(stripSlash(file)) : file => mapHas(stripSlash(file)) } const extractFileSync = opt => { const u = new Unpack.Sync(opt) const file = opt.file 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) } 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) // This trades a zero-byte read() syscall for a stat // However, it will usually result in less memory allocation fs.stat(file, (er, stat) => { 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 } const extractSync = opt => new Unpack.Sync(opt) const extract = opt => new Unpack(opt)