diff --git a/frontend/app/player/MessageDistributor/PrimitiveReader.ts b/frontend/app/player/MessageDistributor/PrimitiveReader.ts
index 6ee5ade4e..7dc8eb023 100644
--- a/frontend/app/player/MessageDistributor/PrimitiveReader.ts
+++ b/frontend/app/player/MessageDistributor/PrimitiveReader.ts
@@ -1,6 +1,10 @@
 export default class PrimitiveReader {
   protected p = 0
   constructor(protected readonly buf: Uint8Array) {}
+
+  hasNext() {
+    return this.buf.length < this.buf.p
+  }
   
   readUint() {
     var r = 0, s = 1, b;
diff --git a/frontend/app/player/ios/Parser.ts b/frontend/app/player/ios/Parser.ts
new file mode 100644
index 000000000..7791398f6
--- /dev/null
+++ b/frontend/app/player/ios/Parser.ts
@@ -0,0 +1,29 @@
+import readMessage from '../MessageDistributor/messages';
+import PrimitiveReader from '../MessageDistributor/PrimitiveReader';
+
+
+export default class Parser {
+	private reader: PrimitiveReader
+	private error = null
+	constructor(byteArray) {
+		this.reader = new PrimitiveReader(byteArray)
+	}
+
+	parseEach(cb) {
+		while (this.hasNext()) {
+			const msg = this.parseNext();
+			if (msg !== null) {
+				cb(msg);
+			}
+		}
+	}
+
+	hasNext() {
+		return !this.error && this.reader.hasNext();
+	}
+
+	parseNext() {
+		return readMessage(this.reader);
+	}
+
+}
\ No newline at end of file
diff --git a/frontend/app/player/ios/parser.js b/frontend/app/player/ios/parser.js
deleted file mode 100644
index 83ddaec50..000000000
--- a/frontend/app/player/ios/parser.js
+++ /dev/null
@@ -1,31 +0,0 @@
-import readMessage from '../MessageDistributor/messages';
-
-
-export default class Parser  {
-	_p = 0
-	_data
-	_error = null
-	constructor(byteArray) {
-		this._data = byteArray;
-	}
-
-	parseEach(cb) {
-		while (this.hasNext()) {
-			const msg = this.parseNext();
-			if (msg !== null) {
-				cb(msg);
-			}
-		}
-	}
-
-	hasNext() {
-		return !this._error && this._data.length > this._p;
-	}
-
-	parseNext() {
-		let msg;
-		[ msg, this._p ] = readMessage(this._data, this._p);
-		return msg
-	}
-
-}
\ No newline at end of file