fix(is_mso): adjust TextStart property value according to the decoded…

… string length of player name

fix #43

src/packets/IS_MSO.test.ts

@@ -41,16 +41,16 @@ describe('IS_MSO', () => {
   });
 
   describe('non-ASCII characters in message', () => {
-    const size = 32;
+    const size = 36;
 
     const data: PacketTestData<IS_MSO> = {
       ReqI: 0,
       Zero: 0,
       UCID: 2,
       PLID: 4,
       UserType: UserType.MSO_USER,
-      TextStart: 15,
-      Msg: '^7Player ^7: ^8cršč',
+      TextStart: 15, // After converting Msg from bytes into UTF-8
+      Msg: '^7Player ě ^7: ^8cršč',
     };
 
     const buffer = new Uint8Array([
@@ -61,7 +61,7 @@ describe('IS_MSO', () => {
       2, // UCID
       4, // PLID
       1, // UserType
-      15, // TextStart
+      17, // TextStart
       94, // Msg
       55,
       80,
@@ -72,6 +72,10 @@ describe('IS_MSO', () => {
       114,
       32,
       94,
+      69,
+      236,
+      32,
+      94,
       55,
       58,
       32,

src/packets/IS_MSO.ts

@@ -1,3 +1,5 @@
+import isArray from 'lodash/isArray';
+
 import { byte, getFormat, stringNull } from '../decorators';
 import { InSimError } from '../errors';
 import { unpack } from '../lfspack';
@@ -47,6 +49,21 @@ export class IS_MSO extends Packet {
       Msg: `${msgLength}s`,
     });
 
+    const playerNameUnpacked = unpack(
+      `<${this.TextStart}s`,
+      buffer.buffer,
+      IS_MSO.FIXED_DATA_SIZE,
+    );
+
+    if (
+      playerNameUnpacked !== null &&
+      isArray(playerNameUnpacked[0]) &&
+      playerNameUnpacked[0].length === 2
+    ) {
+      const [, playerName] = playerNameUnpacked[0];
+      this.TextStart = playerName.length;
+    }
+
     return this;
   }
 }