--- /dev/null
+'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.)
+
+const Buffer = require('./buffer.js')
+const types = require('./types.js')
+const pathModule = require('path').posix
+const large = require('./large-numbers.js')
+
+const SLURP = Symbol('slurp')
+const TYPE = Symbol('type')
+
+class Header {
+ constructor (data, off, ex, gex) {
+ this.cksumValid = false
+ this.needPax = false
+ this.nullBlock = false
+
+ 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
+
+ if (Buffer.isBuffer(data))
+ this.decode(data, off || 0, ex, gex)
+ else if (data)
+ this.set(data)
+ }
+
+ decode (buf, off, ex, gex) {
+ if (!off)
+ off = 0
+
+ if (!buf || !(buf.length >= off + 512))
+ throw new Error('need 512 bytes for header')
+
+ 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)
+
+ // if we have extended or global extended headers, apply them now
+ // See https://github.com/npm/node-tar/pull/187
+ this[SLURP](ex)
+ this[SLURP](gex, true)
+
+ // 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' && this.path.substr(-1) === '/')
+ this[TYPE] = '5'
+
+ // 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
+
+ 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 >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)
+ }
+ }
+
+ let sum = 8 * 0x20
+ for (let i = off; i < off + 148; i++) {
+ sum += buf[i]
+ }
+ for (let i = off + 156; i < off + 512; i++) {
+ sum += buf[i]
+ }
+ this.cksumValid = sum === this.cksum
+ if (this.cksum === null && sum === 8 * 0x20)
+ this.nullBlock = true
+ }
+
+ [SLURP] (ex, global) {
+ for (let k in ex) {
+ // we slurp in everything except for the path attribute in
+ // a global extended header, because that's weird.
+ if (ex[k] !== null && ex[k] !== undefined &&
+ !(global && k === 'path'))
+ this[k] = ex[k]
+ }
+ }
+
+ encode (buf, off) {
+ if (!buf) {
+ buf = this.block = Buffer.alloc(512)
+ off = 0
+ }
+
+ if (!off)
+ off = 0
+
+ if (!(buf.length >= off + 512))
+ throw new Error('need 512 bytes for header')
+
+ 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]
+
+ 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
+ }
+
+ let sum = 8 * 0x20
+ for (let i = off; i < off + 148; i++) {
+ sum += buf[i]
+ }
+ for (let i = off + 156; i < off + 512; i++) {
+ sum += buf[i]
+ }
+ this.cksum = sum
+ encNumber(buf, off + 148, 8, this.cksum)
+ this.cksumValid = true
+
+ return this.needPax
+ }
+
+ set (data) {
+ for (let i in data) {
+ if (data[i] !== null && data[i] !== undefined)
+ this[i] = data[i]
+ }
+ }
+
+ get type () {
+ return types.name.get(this[TYPE]) || this[TYPE]
+ }
+
+ get typeKey () {
+ return this[TYPE]
+ }
+
+ set type (type) {
+ if (types.code.has(type))
+ this[TYPE] = types.code.get(type)
+ else
+ this[TYPE] = type
+ }
+}
+
+const splitPrefix = (p, prefixSize) => {
+ const pathSize = 100
+ let pp = p
+ let prefix = ''
+ let ret
+ const root = pathModule.parse(p).root || '.'
+
+ if (Buffer.byteLength(pp) < 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)
+
+ do {
+ // both fit!
+ if (Buffer.byteLength(pp) <= pathSize &&
+ Buffer.byteLength(prefix) <= prefixSize)
+ ret = [pp, prefix, false]
+
+ // prefix fits in prefix, but path doesn't fit in path
+ else if (Buffer.byteLength(pp) > pathSize &&
+ Buffer.byteLength(prefix) <= prefixSize)
+ ret = [pp.substr(0, pathSize - 1), prefix, true]
+
+ else {
+ // make path take a bit from prefix
+ pp = pathModule.join(pathModule.basename(prefix), pp)
+ prefix = pathModule.dirname(prefix)
+ }
+ } while (prefix !== root && !ret)
+
+ // at this point, found no resolution, just truncate
+ if (!ret)
+ ret = [p.substr(0, pathSize - 1), '', true]
+ }
+ return ret
+}
+
+const decString = (buf, off, size) =>
+ buf.slice(off, off + size).toString('utf8').replace(/\0.*/, '')
+
+const decDate = (buf, off, size) =>
+ numToDate(decNumber(buf, off, size))
+
+const numToDate = num => num === null ? null : new Date(num * 1000)
+
+const decNumber = (buf, off, size) =>
+ buf[off] & 0x80 ? large.parse(buf.slice(off, off + size))
+ : decSmallNumber(buf, off, size)
+
+const nanNull = value => isNaN(value) ? null : value
+
+const decSmallNumber = (buf, off, size) =>
+ nanNull(parseInt(
+ buf.slice(off, off + size)
+ .toString('utf8').replace(/\0.*$/, '').trim(), 8))
+
+// the maximum encodable as a null-terminated octal, by field size
+const MAXNUM = {
+ 12: 0o77777777777,
+ 8 : 0o7777777
+}
+
+const encNumber = (buf, off, size, number) =>
+ number === null ? false :
+ number > MAXNUM[size] || number < 0
+ ? (large.encode(number, buf.slice(off, off + size)), true)
+ : (encSmallNumber(buf, off, size, number), false)
+
+const encSmallNumber = (buf, off, size, number) =>
+ buf.write(octalString(number, size), off, size, 'ascii')
+
+const octalString = (number, size) =>
+ padOctal(Math.floor(number).toString(8), size)
+
+const padOctal = (string, size) =>
+ (string.length === size - 1 ? string
+ : new Array(size - string.length - 1).join('0') + string + ' ') + '\0'
+
+const encDate = (buf, off, size, date) =>
+ date === null ? false :
+ encNumber(buf, off, size, date.getTime() / 1000)
+
+// 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) =>
+ string === null ? false :
+ (buf.write(string + NULLS, off, size, 'utf8'),
+ string.length !== Buffer.byteLength(string) || string.length > size)
+
+module.exports = Header
git://repos.xcallymotion.com / motion2.git / blobdiff