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 <a href="../../index.html">All files</a> / <a href="index.html">tar/lib</a> header.js
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&nbsp;</td><td class="text"><pre class="prettyprint lang-js">'use strict'
// parse a 512-byte header block to a data object, or vice-versa
// encode returns `true` if a pax extended header is needed, because
// the data could not be faithfully encoded in a simple header.
// (Also, check header.needPax to see if it needs a pax header.)
&nbsp;
const types = require('./types.js')
const pathModule = require('path')
const large = require('./large-numbers.js')
&nbsp;
const TYPE = Symbol('type')
&nbsp;
class Header {
 constructor (data, off) {
 this.cksumValid = false
 this.needPax = false
 this.nullBlock = false
&nbsp;
 this.block = null
 this.path = null
 this.mode = null
 this.uid = null
 this.gid = null
 this.size = null
 this.mtime = null
 this.cksum = null
 this[TYPE] = '0'
 this.linkpath = null
 this.uname = null
 this.gname = null
 this.devmaj = 0
 this.devmin = 0
 this.atime = null
 this.ctime = null
&nbsp;
 if (Buffer.isBuffer(data)) {
 this.decode(data, off || 0)
 } else if (data)
 this.set(data)
 }
&nbsp;
 decode (buf, off) {
 if (!off)
 off = 0
&nbsp;
 if (!buf || !(buf.length &gt;= off + 512))
 throw new Error('need 512 bytes for header')
&nbsp;
 this.path = decString(buf, off, 100)
 this.mode = decNumber(buf, off + 100, 8)
 this.uid = decNumber(buf, off + 108, 8)
 this.gid = decNumber(buf, off + 116, 8)
 this.size = decNumber(buf, off + 124, 12)
 this.mtime = decDate(buf, off + 136, 12)
 this.cksum = decNumber(buf, off + 148, 12)
&nbsp;
 // old tar versions marked dirs as a file with a trailing /
 this[TYPE] = decString(buf, off + 156, 1)
 if (this[TYPE] === '')
 this[TYPE] = '0'
 if (this[TYPE] === '0' &amp;&amp; this.path.substr(-1) === '/')
 this[TYPE] = '5'
&nbsp;
 // tar implementations sometimes incorrectly put the stat(dir).size
 // as the size in the tarball, even though Directory entries are
 // not able to have any body at all. In the very rare chance that
 // it actually DOES have a body, we weren't going to do anything with
 // it anyway, and it'll just be a warning about an invalid header.
 if (this[TYPE] === '5')
 this.size = 0
&nbsp;
 this.linkpath = decString(buf, off + 157, 100)
 if (buf.slice(off + 257, off + 265).toString() === 'ustar\u000000') {
 this.uname = decString(buf, off + 265, 32)
 this.gname = decString(buf, off + 297, 32)
 this.devmaj = decNumber(buf, off + 329, 8)
 this.devmin = decNumber(buf, off + 337, 8)
 if (buf[off + 475] !== 0) {
 // definitely a prefix, definitely &gt;130 chars.
 const prefix = decString(buf, off + 345, 155)
 this.path = prefix + '/' + this.path
 } else {
 const prefix = decString(buf, off + 345, 130)
 if (prefix)
 this.path = prefix + '/' + this.path
 this.atime = decDate(buf, off + 476, 12)
 this.ctime = decDate(buf, off + 488, 12)
 }
 }
&nbsp;
 let sum = 8 * 0x20
 for (let i = off; i &lt; off + 148; i++) {
 sum += buf[i]
 }
 for (let i = off + 156; i &lt; off + 512; i++) {
 sum += buf[i]
 }
 this.cksumValid = sum === this.cksum
 if (this.cksum === null &amp;&amp; sum === 8 * 0x20)
 this.nullBlock = true
 }
&nbsp;
 encode (buf, off) {
 if (!buf) {
 buf = this.block = Buffer.alloc(512)
 off = 0
 }
&nbsp;
 if (!off)
 off = 0
&nbsp;
 if (!(buf.length &gt;= off + 512))
 throw new Error('need 512 bytes for header')
&nbsp;
 const prefixSize = this.ctime || this.atime ? 130 : 155
 const split = splitPrefix(this.path || '', prefixSize)
 const path = split[0]
 const prefix = split[1]
 this.needPax = split[2]
&nbsp;
 this.needPax = encString(buf, off, 100, path) || this.needPax
 this.needPax = encNumber(buf, off + 100, 8, this.mode) || this.needPax
 this.needPax = encNumber(buf, off + 108, 8, this.uid) || this.needPax
 this.needPax = encNumber(buf, off + 116, 8, this.gid) || this.needPax
 this.needPax = encNumber(buf, off + 124, 12, this.size) || this.needPax
 this.needPax = encDate(buf, off + 136, 12, this.mtime) || this.needPax
 buf[off + 156] = this[TYPE].charCodeAt(0)
 this.needPax = encString(buf, off + 157, 100, this.linkpath) || this.needPax
 buf.write('ustar\u000000', off + 257, 8)
 this.needPax = encString(buf, off + 265, 32, this.uname) || this.needPax
 this.needPax = encString(buf, off + 297, 32, this.gname) || this.needPax
 this.needPax = encNumber(buf, off + 329, 8, this.devmaj) || this.needPax
 this.needPax = encNumber(buf, off + 337, 8, this.devmin) || this.needPax
 this.needPax = encString(buf, off + 345, prefixSize, prefix) || this.needPax
 if (buf[off + 475] !== 0)
 this.needPax = encString(buf, off + 345, 155, prefix) || this.needPax
 else {
 this.needPax = encString(buf, off + 345, 130, prefix) || this.needPax
 this.needPax = encDate(buf, off + 476, 12, this.atime) || this.needPax
 this.needPax = encDate(buf, off + 488, 12, this.ctime) || this.needPax
 }
&nbsp;
 let sum = 8 * 0x20
 for (let i = off; i &lt; off + 148; i++) {
 sum += buf[i]
 }
 for (let i = off + 156; i &lt; off + 512; i++) {
 sum += buf[i]
 }
 this.cksum = sum
 encNumber(buf, off + 148, 8, this.cksum)
 this.cksumValid = true
&nbsp;
 return this.needPax
 }
&nbsp;
 set (data) {
 for (let i in data) {
 if (data[i] !== null &amp;&amp; data[i] !== undefined)
 this[i] = data[i]
 }
 }
&nbsp;
 get type () {
 return types.name.get(this[TYPE]) || this[TYPE]
 }
&nbsp;
 get typeKey () {
 return this[TYPE]
 }
&nbsp;
 set type (type) {
 if (types.code.has(type))
 this[TYPE] = types.code.get(type)
 else
 this[TYPE] = type
 }
}
&nbsp;
const splitPrefix = (p, prefixSize) =&gt; {
 const pathSize = 100
 let pp = p
 let prefix = ''
 let ret
 const root = pathModule.parse(p).root || '.'
&nbsp;
 if (Buffer.byteLength(pp) &lt; pathSize)
 ret = [pp, prefix, false]
 else {
 // first set prefix to the dir, and path to the base
 prefix = pathModule.dirname(pp)
 pp = pathModule.basename(pp)
&nbsp;
 do {
 // both fit!
 if (Buffer.byteLength(pp) &lt;= pathSize &amp;&amp;
 Buffer.byteLength(prefix) &lt;= prefixSize)
 ret = [pp, prefix, false]
&nbsp;
 // prefix fits in prefix, but path doesn't fit in path
 else if (Buffer.byteLength(pp) &gt; pathSize &amp;&amp;
 Buffer.byteLength(prefix) &lt;= prefixSize)
 ret = [pp.substr(0, pathSize - 1), prefix, true]
&nbsp;
 else {
 // make path take a bit from prefix
 pp = pathModule.join(pathModule.basename(prefix), pp)
 prefix = pathModule.dirname(prefix)
 }
 } while (prefix !== root &amp;&amp; !ret)
&nbsp;
 // at this point, found no resolution, just truncate
 if (!ret)
 ret = [p.substr(0, pathSize - 1), '', true]
 }
 return ret
}
&nbsp;
const decString = (buf, off, size) =&gt;
 buf.slice(off, off + size).toString('utf8').replace(/\0.*/, '')
&nbsp;
const decDate = (buf, off, size) =&gt;
 numToDate(decNumber(buf, off, size))
&nbsp;
const numToDate = num =&gt; num === null ? null : new Date(num * 1000)
&nbsp;
const decNumber = (buf, off, size) =&gt;
 buf[off] &amp; 0x80 ? large.parse(buf.slice(off, off + size))
 : decSmallNumber(buf, off, size)
&nbsp;
const nanNull = value =&gt; isNaN(value) ? null : value
&nbsp;
const decSmallNumber = (buf, off, size) =&gt;
 nanNull(parseInt(
 buf.slice(off, off + size)
 .toString('utf8').replace(/\0.*$/, '').trim(), 8))
&nbsp;
// the maximum encodable as a null-terminated octal, by field size
const MAXNUM = {
 12: 0o77777777777,
 8 : 0o7777777
}
&nbsp;
const encNumber = (buf, off, size, number) =&gt;
 number === null ? false :
 number &gt; MAXNUM[size] || number &lt; 0
 ? (large.encode(number, buf.slice(off, off + size)), true)
 : (encSmallNumber(buf, off, size, number), false)
&nbsp;
const encSmallNumber = (buf, off, size, number) =&gt;
 buf.write(octalString(number, size), off, size, 'ascii')
&nbsp;
const octalString = (number, size) =&gt;
 padOctal(Math.floor(number).toString(8), size)
&nbsp;
const padOctal = (string, size) =&gt;
 (string.length === size - 1 ? string
 : new Array(size - string.length - 1).join('0') + string + ' ') + '\0'
&nbsp;
const encDate = (buf, off, size, date) =&gt;
 date === null ? false :
 encNumber(buf, off, size, date.getTime() / 1000)
&nbsp;
// enough to fill the longest string we've got
const NULLS = new Array(156).join('\0')
// pad with nulls, return true if it's longer or non-ascii
const encString = (buf, off, size, string) =&gt;
 string === null ? false :
 (buf.write(string + NULLS, off, size, 'utf8'),
 string.length !== Buffer.byteLength(string) || string.length &gt; size)
&nbsp;
module.exports = Header
&nbsp;</pre></td></tr>
</table></pre>
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