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files >> //opt/alt/alt-nodejs6/root/lib/node_modules/npm/node_modules.bundled/tar/lib/entry.js
// A passthrough read/write stream that sets its properties // based on a header, extendedHeader, and globalHeader // // Can be either a file system object of some sort, or // a pax/ustar metadata entry. module.exports = Entry var TarHeader = require("./header.js") , tar = require("../tar") , assert = require("assert").ok , Stream = require("stream").Stream , inherits = require("inherits") , fstream = require("fstream").Abstract function Entry (header, extended, global) { Stream.call(this) this.readable = true this.writable = true this._needDrain = false this._paused = false this._reading = false this._ending = false this._ended = false this._remaining = 0 this._abort = false this._queue = [] this._index = 0 this._queueLen = 0 this._read = this._read.bind(this) this.props = {} this._header = header this._extended = extended || {} // globals can change throughout the course of // a file parse operation. Freeze it at its current state. this._global = {} var me = this Object.keys(global || {}).forEach(function (g) { me._global[g] = global[g] }) this._setProps() } inherits(Entry, Stream) Entry.prototype.write = function (c) { if (this._ending) this.error("write() after end()", null, true) if (this._remaining === 0) { this.error("invalid bytes past eof") } // often we'll get a bunch of \0 at the end of the last write, // since chunks will always be 512 bytes when reading a tarball. if (c.length > this._remaining) { c = c.slice(0, this._remaining) } this._remaining -= c.length // put it on the stack. var ql = this._queueLen this._queue.push(c) this._queueLen ++ this._read() // either paused, or buffered if (this._paused || ql > 0) { this._needDrain = true return false } return true } Entry.prototype.end = function (c) { if (c) this.write(c) this._ending = true this._read() } Entry.prototype.pause = function () { this._paused = true this.emit("pause") } Entry.prototype.resume = function () { // console.error(" Tar Entry resume", this.path) this.emit("resume") this._paused = false this._read() return this._queueLen - this._index > 1 } // This is bound to the instance Entry.prototype._read = function () { // console.error(" Tar Entry _read", this.path) if (this._paused || this._reading || this._ended) return // set this flag so that event handlers don't inadvertently // get multiple _read() calls running. this._reading = true // have any data to emit? while (this._index < this._queueLen && !this._paused) { var chunk = this._queue[this._index ++] this.emit("data", chunk) } // check if we're drained if (this._index >= this._queueLen) { this._queue.length = this._queueLen = this._index = 0 if (this._needDrain) { this._needDrain = false this.emit("drain") } if (this._ending) { this._ended = true this.emit("end") } } // if the queue gets too big, then pluck off whatever we can. // this should be fairly rare. var mql = this._maxQueueLen if (this._queueLen > mql && this._index > 0) { mql = Math.min(this._index, mql) this._index -= mql this._queueLen -= mql this._queue = this._queue.slice(mql) } this._reading = false } Entry.prototype._setProps = function () { // props = extended->global->header->{} var header = this._header , extended = this._extended , global = this._global , props = this.props // first get the values from the normal header. var fields = tar.fields for (var f = 0; fields[f] !== null; f ++) { var field = fields[f] , val = header[field] if (typeof val !== "undefined") props[field] = val } // next, the global header for this file. // numeric values, etc, will have already been parsed. ;[global, extended].forEach(function (p) { Object.keys(p).forEach(function (f) { if (typeof p[f] !== "undefined") props[f] = p[f] }) }) // no nulls allowed in path or linkpath ;["path", "linkpath"].forEach(function (p) { if (props.hasOwnProperty(p)) { props[p] = props[p].split("\0")[0] } }) // set date fields to be a proper date ;["mtime", "ctime", "atime"].forEach(function (p) { if (props.hasOwnProperty(p)) { props[p] = new Date(props[p] * 1000) } }) // set the type so that we know what kind of file to create var type switch (tar.types[props.type]) { case "OldFile": case "ContiguousFile": type = "File" break case "GNUDumpDir": type = "Directory" break case undefined: type = "Unknown" break case "Link": case "SymbolicLink": case "CharacterDevice": case "BlockDevice": case "Directory": case "FIFO": default: type = tar.types[props.type] } this.type = type this.path = props.path this.size = props.size // size is special, since it signals when the file needs to end. this._remaining = props.size } // the parser may not call write if _abort is true. // useful for skipping data from some files quickly. Entry.prototype.abort = function(){ this._abort = true } Entry.prototype.warn = fstream.warn Entry.prototype.error = fstream.error
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