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module.exports = File
var eos = require('end-of-stream')
var EventEmitter = require('events').EventEmitter
var FileStream = require('./file-stream')
var inherits = require('inherits')
var path = require('path')
var render = require('render-media')
var stream = require('stream')
var streamToBlobURL = require('stream-to-blob-url')
var streamToBuffer = require('stream-with-known-length-to-buffer')
inherits(File, EventEmitter)
/**
* @param {Torrent} torrent torrent that the file belongs to
* @param {Object} file file object from the parsed torrent
*/
function File (torrent, file) {
EventEmitter.call(this)
this._torrent = torrent
this.name = file.name
this.path = file.path
this.length = file.length
this.offset = file.offset
this.done = false
var start = file.offset
var end = start + file.length - 1
this._startPiece = start / this._torrent.pieceLength | 0
this._endPiece = end / this._torrent.pieceLength | 0
if (this.length === 0) {
this.done = true
this.emit('done')
}
}
/**
* Selects the file to be downloaded, but at a lower priority than files with streams.
* Useful if you know you need the file at a later stage.
*/
File.prototype.select = function (priority) {
if (this.length === 0) return
this._torrent.select(this._startPiece, this._endPiece, priority)
}
/**
* Deselects the file, which means it won't be downloaded unless someone creates a stream
* for it.
*/
File.prototype.deselect = function () {
if (this.length === 0) return
this._torrent.deselect(this._startPiece, this._endPiece, false)
}
/**
* Create a readable stream to the file. Pieces needed by the stream will be prioritized
* highly and fetched from the swarm first.
*
* @param {Object=} opts
* @param {number} opts.start start stream at byte (inclusive)
* @param {number} opts.end end stream at byte (inclusive)
* @return {FileStream}
*/
File.prototype.createReadStream = function (opts) {
var self = this
if (this.length === 0) {
var empty = new stream.PassThrough()
process.nextTick(function () {
empty.end()
})
return empty
}
var fileStream = new FileStream(self, opts)
self._torrent.select(fileStream._startPiece, fileStream._endPiece, true, function () {
fileStream._notify()
})
eos(fileStream, function () {
self._torrent.deselect(fileStream._startPiece, fileStream._endPiece, true)
})
return fileStream
}
/**
* @param {function} cb
*/
File.prototype.getBuffer = function (cb) {
streamToBuffer(this.createReadStream(), this.length, cb)
}
/**
* @param {function} cb
*/
File.prototype.getBlobURL = function (cb) {
if (typeof window === 'undefined') throw new Error('browser-only method')
var mime = render.mime[path.extname(this.name).toLowerCase()]
streamToBlobURL(this.createReadStream(), this.length, mime, cb)
}
/**
* @param {Element|string} elem
* @param {function} cb
*/
File.prototype.appendTo = function (elem, cb) {
if (typeof window === 'undefined') throw new Error('browser-only method')
render.append(this, elem, cb)
}
/**
* @param {Element|string} elem
* @param {function} cb
*/
File.prototype.renderTo = function (elem, cb) {
if (typeof window === 'undefined') throw new Error('browser-only method')
render.render(this, elem, cb)
}
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