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const writeToStream = require('./writeToStream')
const { EventEmitter } = require('events')
const { Buffer } = require('buffer')
function generate (packet, opts) {
const stream = new Accumulator()
writeToStream(packet, stream, opts)
return stream.concat()
}
class Accumulator extends EventEmitter {
constructor () {
super()
this._array = new Array(20)
this._i = 0
}
write (chunk) {
this._array[this._i++] = chunk
return true
}
concat () {
let length = 0
const lengths = new Array(this._array.length)
const list = this._array
let pos = 0
let i
for (i = 0; i < list.length && list[i] !== undefined; i++) {
if (typeof list[i] !== 'string') lengths[i] = list[i].length
else lengths[i] = Buffer.byteLength(list[i])
length += lengths[i]
}
const result = Buffer.allocUnsafe(length)
for (i = 0; i < list.length && list[i] !== undefined; i++) {
if (typeof list[i] !== 'string') {
list[i].copy(result, pos)
pos += lengths[i]
} else {
result.write(list[i], pos)
pos += lengths[i]
}
}
return result
}
destroy (err) {
if (err) this.emit('error', err)
}
}
module.exports = generate
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