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'use strict'
const { Minipass } = require('minipass')
const normPath = require('./normalize-windows-path.js')
const SLURP = Symbol('slurp')
module.exports = class ReadEntry extends Minipass {
constructor (header, ex, gex) {
super()
// read entries always start life paused. this is to avoid the
// situation where Minipass's auto-ending empty streams results
// in an entry ending before we're ready for it.
this.pause()
this.extended = ex
this.globalExtended = gex
this.header = header
this.startBlockSize = 512 * Math.ceil(header.size / 512)
this.blockRemain = this.startBlockSize
this.remain = header.size
this.type = header.type
this.meta = false
this.ignore = false
switch (this.type) {
case 'File':
case 'OldFile':
case 'Link':
case 'SymbolicLink':
case 'CharacterDevice':
case 'BlockDevice':
case 'Directory':
case 'FIFO':
case 'ContiguousFile':
case 'GNUDumpDir':
break
case 'NextFileHasLongLinkpath':
case 'NextFileHasLongPath':
case 'OldGnuLongPath':
case 'GlobalExtendedHeader':
case 'ExtendedHeader':
case 'OldExtendedHeader':
this.meta = true
break
// NOTE: gnutar and bsdtar treat unrecognized types as 'File'
// it may be worth doing the same, but with a warning.
default:
this.ignore = true
}
this.path = normPath(header.path)
this.mode = header.mode
if (this.mode) {
this.mode = this.mode & 0o7777
}
this.uid = header.uid
this.gid = header.gid
this.uname = header.uname
this.gname = header.gname
this.size = header.size
this.mtime = header.mtime
this.atime = header.atime
this.ctime = header.ctime
this.linkpath = normPath(header.linkpath)
this.uname = header.uname
this.gname = header.gname
if (ex) {
this[SLURP](ex)
}
if (gex) {
this[SLURP](gex, true)
}
}
write (data) {
const writeLen = data.length
if (writeLen > this.blockRemain) {
throw new Error('writing more to entry than is appropriate')
}
const r = this.remain
const br = this.blockRemain
this.remain = Math.max(0, r - writeLen)
this.blockRemain = Math.max(0, br - writeLen)
if (this.ignore) {
return true
}
if (r >= writeLen) {
return super.write(data)
}
// r < writeLen
return super.write(data.slice(0, r))
}
[SLURP] (ex, global) {
for (const 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] = k === 'path' || k === 'linkpath' ? normPath(ex[k]) : ex[k]
}
}
}
}