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const { EventEmitter } = require('events')
const { PassThrough } = require('readable-stream')
const eos = require('end-of-stream')
const path = require('path')
const render = require('render-media')
const streamToBlob = require('stream-to-blob')
const streamToBlobURL = require('stream-to-blob-url')
const streamToBuffer = require('stream-with-known-length-to-buffer')
const FileStream = require('./file-stream')
class File extends EventEmitter {
constructor (torrent, file) {
super()
this._torrent = torrent
this._destroyed = false
this.name = file.name
this.path = file.path
this.length = file.length
this.offset = file.offset
this.done = false
const start = file.offset
const 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')
}
}
get downloaded () {
if (!this._torrent.bitfield) return 0
const { pieces, bitfield, pieceLength } = this._torrent
const { _startPiece: start, _endPiece: end } = this
const piece = pieces[start]
// Calculate first piece diffrently, it sometimes have a offset
let downloaded = bitfield.get(start)
? pieceLength - (this.offset % pieceLength)
: Math.max(piece.length - piece.missing - this.offset, 0)
for (let index = start + 1; index <= end; ++index) {
if (bitfield.get(index)) {
// verified data
downloaded += pieceLength
} else {
// "in progress" data
const piece = pieces[index]
downloaded += piece.length - piece.missing
}
}
// We don't have a end-offset and one small file can fith in the middle
// of one chunk, so return this.length if it's oversized
return Math.min(downloaded, this.length)
}
get progress () {
return this.length ? this.downloaded / this.length : 0
}
select (priority) {
if (this.length === 0) return
this._torrent.select(this._startPiece, this._endPiece, priority)
}
deselect () {
if (this.length === 0) return
this._torrent.deselect(this._startPiece, this._endPiece, false)
}
createReadStream (opts) {
if (this.length === 0) {
const empty = new PassThrough()
process.nextTick(() => {
empty.end()
})
return empty
}
const fileStream = new FileStream(this, opts)
this._torrent.select(fileStream._startPiece, fileStream._endPiece, true, () => {
fileStream._notify()
})
eos(fileStream, () => {
if (this._destroyed) return
if (!this._torrent.destroyed) {
this._torrent.deselect(fileStream._startPiece, fileStream._endPiece, true)
}
})
return fileStream
}
getBuffer (cb) {
streamToBuffer(this.createReadStream(), this.length, cb)
}
getBlob (cb) {
if (typeof window === 'undefined') throw new Error('browser-only method')
streamToBlob(this.createReadStream(), this._getMimeType(), cb)
}
getBlobURL (cb) {
if (typeof window === 'undefined') throw new Error('browser-only method')
streamToBlobURL(this.createReadStream(), this._getMimeType(), cb)
}
appendTo (elem, opts, cb) {
if (typeof window === 'undefined') throw new Error('browser-only method')
render.append(this, elem, opts, cb)
}
renderTo (elem, opts, cb) {
if (typeof window === 'undefined') throw new Error('browser-only method')
render.render(this, elem, opts, cb)
}
_getMimeType () {
return render.mime[path.extname(this.name).toLowerCase()]
}
_destroy () {
this._destroyed = true
this._torrent = null
}
}
module.exports = File
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