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