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var constants = require('constants')
var eos = require('end-of-stream')
var util = require('util')
var Readable = require('readable-stream').Readable
var Writable = require('readable-stream').Writable
var StringDecoder = require('string_decoder').StringDecoder
var headers = require('./headers')
var DMODE = parseInt('755', 8)
var FMODE = parseInt('644', 8)
var END_OF_TAR = new Buffer(1024)
END_OF_TAR.fill(0)
var noop = function () {}
var overflow = function (self, size) {
size &= 511
if (size) self.push(END_OF_TAR.slice(0, 512 - size))
}
function modeToType (mode) {
switch (mode & constants.S_IFMT) {
case constants.S_IFBLK: return 'block-device'
case constants.S_IFCHR: return 'character-device'
case constants.S_IFDIR: return 'directory'
case constants.S_IFIFO: return 'fifo'
case constants.S_IFLNK: return 'symlink'
}
return 'file'
}
var Sink = function (to) {
Writable.call(this)
this.written = 0
this._to = to
this._destroyed = false
}
util.inherits(Sink, Writable)
Sink.prototype._write = function (data, enc, cb) {
this.written += data.length
if (this._to.push(data)) return cb()
this._to._drain = cb
}
Sink.prototype.destroy = function () {
if (this._destroyed) return
this._destroyed = true
this.emit('close')
}
var LinkSink = function () {
Writable.call(this)
this.linkname = ''
this._decoder = new StringDecoder('utf-8')
this._destroyed = false
}
util.inherits(LinkSink, Writable)
LinkSink.prototype._write = function (data, enc, cb) {
this.linkname += this._decoder.write(data)
cb()
}
LinkSink.prototype.destroy = function () {
if (this._destroyed) return
this._destroyed = true
this.emit('close')
}
var Void = function () {
Writable.call(this)
this._destroyed = false
}
util.inherits(Void, Writable)
Void.prototype._write = function (data, enc, cb) {
cb(new Error('No body allowed for this entry'))
}
Void.prototype.destroy = function () {
if (this._destroyed) return
this._destroyed = true
this.emit('close')
}
var Pack = function (opts) {
if (!(this instanceof Pack)) return new Pack(opts)
Readable.call(this, opts)
this._drain = noop
this._finalized = false
this._finalizing = false
this._destroyed = false
this._stream = null
}
util.inherits(Pack, Readable)
Pack.prototype.entry = function (header, buffer, callback) {
if (this._stream) throw new Error('already piping an entry')
if (this._finalized || this._destroyed) return
if (typeof buffer === 'function') {
callback = buffer
buffer = null
}
if (!callback) callback = noop
var self = this
if (!header.size || header.type === 'symlink') header.size = 0
if (!header.type) header.type = modeToType(header.mode)
if (!header.mode) header.mode = header.type === 'directory' ? DMODE : FMODE
if (!header.uid) header.uid = 0
if (!header.gid) header.gid = 0
if (!header.mtime) header.mtime = new Date()
if (typeof buffer === 'string') buffer = new Buffer(buffer)
if (Buffer.isBuffer(buffer)) {
header.size = buffer.length
this._encode(header)
this.push(buffer)
overflow(self, header.size)
process.nextTick(callback)
return new Void()
}
if (header.type === 'symlink' && !header.linkname) {
var linkSink = new LinkSink()
eos(linkSink, function (err) {
if (err) { // stream was closed
self.destroy()
return callback(err)
}
header.linkname = linkSink.linkname
self._encode(header)
callback()
})
return linkSink
}
this._encode(header)
if (header.type !== 'file' && header.type !== 'contiguous-file') {
process.nextTick(callback)
return new Void()
}
var sink = new Sink(this)
this._stream = sink
eos(sink, function (err) {
self._stream = null
if (err) { // stream was closed
self.destroy()
return callback(err)
}
if (sink.written !== header.size) { // corrupting tar
self.destroy()
return callback(new Error('size mismatch'))
}
overflow(self, header.size)
if (self._finalizing) self.finalize()
callback()
})
return sink
}
Pack.prototype.finalize = function () {
if (this._stream) {
this._finalizing = true
return
}
if (this._finalized) return
this._finalized = true
this.push(END_OF_TAR)
this.push(null)
}
Pack.prototype.destroy = function (err) {
if (this._destroyed) return
this._destroyed = true
if (err) this.emit('error', err)
this.emit('close')
if (this._stream && this._stream.destroy) this._stream.destroy()
}
Pack.prototype._encode = function (header) {
if (!header.pax) {
var buf = headers.encode(header)
if (buf) {
this.push(buf)
return
}
}
this._encodePax(header)
}
Pack.prototype._encodePax = function (header) {
var paxHeader = headers.encodePax({
name: header.name,
linkname: header.linkname,
pax: header.pax
})
var newHeader = {
name: 'PaxHeader',
mode: header.mode,
uid: header.uid,
gid: header.gid,
size: paxHeader.length,
mtime: header.mtime,
type: 'pax-header',
linkname: header.linkname && 'PaxHeader',
uname: header.uname,
gname: header.gname,
devmajor: header.devmajor,
devminor: header.devminor
}
this.push(headers.encode(newHeader))
this.push(paxHeader)
overflow(this, paxHeader.length)
newHeader.size = header.size
newHeader.type = header.type
this.push(headers.encode(newHeader))
}
Pack.prototype._read = function (n) {
var drain = this._drain
this._drain = noop
drain()
}
module.exports = Pack
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