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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] } } } }