Tracking de l'application VApp (IHM du jeu)

VApp/node_modules/mqtt-packet/generate.js

@@ -0,0 +1,57 @@
+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