# All files / tar/lib pax.js

100% Statements 62/62
100% Branches 75/75
100% Functions 9/9
100% Lines 60/60

    1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    11
    12
    13
    14
    15
    16
    17
    18
    19
    20
    21
    22
    23
    24
    25
    26
    27
    28
    29
    30
    31
    32
    33
    34
    35
    36
    37
    38
    39
    40
    41
    42
    43
    44
    45
    46
    47
    48
    49
    50
    51
    52
    53
    54
    55
    56
    57
    58
    59
    60
    61
    62
    63
    64
    65
    66
    67
    68
    69
    70
    71
    72
    73
    74
    75
    76
    77
    78
    79
    80
    81
    82
    83
    84
    85
    86
    87
    88
    89
    90
    91
    92
    93
    94
    95
    96
    97
    98
    99
    100
    101
    102
    103
    104
    105
    106
    107
    108
    109
    110
    111
    112
    113
    114
    115
    116
    117
    118
    119
    120
    121
    122
    123
    124
    125
    126
    127
    128
    129
    130
    131
    132
    133
    134
    135
    136
    137
    138
    139
    140
    141
    142
    143
    144
    145
    146
    11x
    11x

    435x
    435x
    435x
    435x
    435x
    435x
    435x
    435x
    435x
    435x
    435x
    435x
    435x
    435x
    435x
    435x

    34x
    34x
    1x

    33x

    33x
    33x

    33x
    16896x

    33x

    33x

    33x
    8949x

    33x

    34x

    510x
    204x
    306x

    306x

    306x

    306x
    306x
    30x
    306x
    306x

    401x

    11x
    401x

    11x
    401x

    11x
    2259x

    2259x
    5x

    2254x
    2254x
    2254x
    2254x
    1x

    2253x
    2253x

    2253x

    11x
     '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.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