Code coverage report for tar/lib/pax.js

# All files / tar/lib pax.js

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

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     '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