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Edit File : pax.js \| Size : 3.97 KB
'use strict' const Buffer = require('./buffer.js') 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.substr((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 Back

Edit File : pax.js | Size : 3.97 KB

'use strict'
const Buffer = require('./buffer.js')
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.substr((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

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