132 lines
3.1 KiB
JavaScript
132 lines
3.1 KiB
JavaScript
'use strict'
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// XXX: This shares a lot in common with extract.js
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// maybe some DRY opportunity here?
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// tar -t
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const hlo = require('./high-level-opt.js')
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const Parser = require('./parse.js')
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const fs = require('fs')
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const fsm = require('fs-minipass')
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const path = require('path')
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const stripSlash = require('./strip-trailing-slashes.js')
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module.exports = (opt_, files, cb) => {
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if (typeof opt_ === 'function')
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cb = opt_, files = null, opt_ = {}
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else if (Array.isArray(opt_))
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files = opt_, opt_ = {}
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if (typeof files === 'function')
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cb = files, files = null
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if (!files)
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files = []
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else
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files = Array.from(files)
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const opt = hlo(opt_)
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if (opt.sync && typeof cb === 'function')
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throw new TypeError('callback not supported for sync tar functions')
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if (!opt.file && typeof cb === 'function')
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throw new TypeError('callback only supported with file option')
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if (files.length)
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filesFilter(opt, files)
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if (!opt.noResume)
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onentryFunction(opt)
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return opt.file && opt.sync ? listFileSync(opt)
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: opt.file ? listFile(opt, cb)
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: list(opt)
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}
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const onentryFunction = opt => {
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const onentry = opt.onentry
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opt.onentry = onentry ? e => {
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onentry(e)
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e.resume()
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} : e => e.resume()
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}
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// construct a filter that limits the file entries listed
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// include child entries if a dir is included
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const filesFilter = (opt, files) => {
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const map = new Map(files.map(f => [stripSlash(f), true]))
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const filter = opt.filter
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const mapHas = (file, r) => {
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const root = r || path.parse(file).root || '.'
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const ret = file === root ? false
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: map.has(file) ? map.get(file)
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: mapHas(path.dirname(file), root)
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map.set(file, ret)
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return ret
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}
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opt.filter = filter
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? (file, entry) => filter(file, entry) && mapHas(stripSlash(file))
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: file => mapHas(stripSlash(file))
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}
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const listFileSync = opt => {
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const p = list(opt)
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const file = opt.file
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let threw = true
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let fd
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try {
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const stat = fs.statSync(file)
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const readSize = opt.maxReadSize || 16 * 1024 * 1024
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if (stat.size < readSize)
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p.end(fs.readFileSync(file))
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else {
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let pos = 0
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const buf = Buffer.allocUnsafe(readSize)
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fd = fs.openSync(file, 'r')
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while (pos < stat.size) {
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const bytesRead = fs.readSync(fd, buf, 0, readSize, pos)
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pos += bytesRead
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p.write(buf.slice(0, bytesRead))
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}
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p.end()
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}
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threw = false
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} finally {
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if (threw && fd) {
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try {
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fs.closeSync(fd)
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} catch (er) {}
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}
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}
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}
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const listFile = (opt, cb) => {
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const parse = new Parser(opt)
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const readSize = opt.maxReadSize || 16 * 1024 * 1024
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const file = opt.file
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const p = new Promise((resolve, reject) => {
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parse.on('error', reject)
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parse.on('end', resolve)
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fs.stat(file, (er, stat) => {
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if (er)
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reject(er)
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else {
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const stream = new fsm.ReadStream(file, {
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readSize: readSize,
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size: stat.size,
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})
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stream.on('error', reject)
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stream.pipe(parse)
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}
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})
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})
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return cb ? p.then(cb, cb) : p
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}
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const list = opt => new Parser(opt)
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