'use strict'
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const Header = require('./header.js')
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const path = require('path')
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class Pax {
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constructor (obj, global) {
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this.atime = obj.atime || null
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this.charset = obj.charset || null
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this.comment = obj.comment || null
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this.ctime = obj.ctime || null
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this.gid = obj.gid || null
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this.gname = obj.gname || null
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this.linkpath = obj.linkpath || null
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this.mtime = obj.mtime || null
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this.path = obj.path || null
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this.size = obj.size || null
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this.uid = obj.uid || null
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this.uname = obj.uname || null
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this.dev = obj.dev || null
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this.ino = obj.ino || null
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this.nlink = obj.nlink || null
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this.global = global || false
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}
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encode () {
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const body = this.encodeBody()
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if (body === '') {
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return null
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}
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const bodyLen = Buffer.byteLength(body)
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// round up to 512 bytes
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// add 512 for header
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const bufLen = 512 * Math.ceil(1 + bodyLen / 512)
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const buf = Buffer.allocUnsafe(bufLen)
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// 0-fill the header section, it might not hit every field
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for (let i = 0; i < 512; i++) {
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buf[i] = 0
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}
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new Header({
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// XXX split the path
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// then the path should be PaxHeader + basename, but less than 99,
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// prepend with the dirname
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path: ('PaxHeader/' + path.basename(this.path)).slice(0, 99),
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mode: this.mode || 0o644,
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uid: this.uid || null,
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gid: this.gid || null,
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size: bodyLen,
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mtime: this.mtime || null,
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type: this.global ? 'GlobalExtendedHeader' : 'ExtendedHeader',
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linkpath: '',
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uname: this.uname || '',
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gname: this.gname || '',
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devmaj: 0,
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devmin: 0,
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atime: this.atime || null,
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ctime: this.ctime || null,
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}).encode(buf)
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buf.write(body, 512, bodyLen, 'utf8')
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// null pad after the body
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for (let i = bodyLen + 512; i < buf.length; i++) {
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buf[i] = 0
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}
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return buf
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}
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encodeBody () {
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return (
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this.encodeField('path') +
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this.encodeField('ctime') +
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this.encodeField('atime') +
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this.encodeField('dev') +
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this.encodeField('ino') +
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this.encodeField('nlink') +
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this.encodeField('charset') +
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this.encodeField('comment') +
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this.encodeField('gid') +
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this.encodeField('gname') +
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this.encodeField('linkpath') +
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this.encodeField('mtime') +
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this.encodeField('size') +
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this.encodeField('uid') +
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this.encodeField('uname')
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)
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}
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encodeField (field) {
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if (this[field] === null || this[field] === undefined) {
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return ''
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}
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const v = this[field] instanceof Date ? this[field].getTime() / 1000
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: this[field]
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const s = ' ' +
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(field === 'dev' || field === 'ino' || field === 'nlink'
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? 'SCHILY.' : '') +
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field + '=' + v + '\n'
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const byteLen = Buffer.byteLength(s)
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// the digits includes the length of the digits in ascii base-10
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// so if it's 9 characters, then adding 1 for the 9 makes it 10
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// which makes it 11 chars.
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let digits = Math.floor(Math.log(byteLen) / Math.log(10)) + 1
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if (byteLen + digits >= Math.pow(10, digits)) {
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digits += 1
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}
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const len = digits + byteLen
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return len + s
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}
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}
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Pax.parse = (string, ex, g) => new Pax(merge(parseKV(string), ex), g)
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const merge = (a, b) =>
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b ? Object.keys(a).reduce((s, k) => (s[k] = a[k], s), b) : a
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const parseKV = string =>
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string
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.replace(/\n$/, '')
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.split('\n')
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.reduce(parseKVLine, Object.create(null))
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const parseKVLine = (set, line) => {
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const n = parseInt(line, 10)
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// XXX Values with \n in them will fail this.
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// Refactor to not be a naive line-by-line parse.
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if (n !== Buffer.byteLength(line) + 1) {
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return set
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}
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line = line.slice((n + ' ').length)
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const kv = line.split('=')
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const k = kv.shift().replace(/^SCHILY\.(dev|ino|nlink)/, '$1')
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if (!k) {
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return set
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}
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const v = kv.join('=')
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set[k] = /^([A-Z]+\.)?([mac]|birth|creation)time$/.test(k)
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? new Date(v * 1000)
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: /^[0-9]+$/.test(v) ? +v
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: v
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return set
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}
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module.exports = Pax
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