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Edit File : read-entry.js \| Size : 2.61 KB
'use strict' const types = require('./types.js') const MiniPass = require('minipass') 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 = 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 = 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 (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] } } } Back

Edit File : read-entry.js | Size : 2.61 KB

'use strict'
const types = require('./types.js')
const MiniPass = require('minipass')

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 = 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 = 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 (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]
    }
  }
}

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