idz: Add new saveExpedition msg format

src/idz/encoder/saveExpedition.ts

@@ -1,6 +1,25 @@
-import { SaveExpeditionResponse } from "../response/saveExpedition";
+import {
+  SaveExpeditionResponse,
+  SaveExpeditionResponse1,
+  SaveExpeditionResponse2,
+} from "../response/saveExpedition";
 
-export function saveExpedition(res: SaveExpeditionResponse) {
+export function saveExpedition(res: SaveExpeditionResponse): Buffer {
+  switch (res.format) {
+    case 1:
+      return saveExpedition1(res);
+
+    case 2:
+      return saveExpedition2(res);
+
+    default:
+      const exhaust: never = res;
+
+      throw new Error(`Unsupported data format ${res["format"]}`);
+  }
+}
+
+function saveExpedition1(res: SaveExpeditionResponse1): Buffer {
   // in awe of the size of this lad
   const buf = Buffer.alloc(0x17c0);
 
@@ -8,3 +27,12 @@ export function saveExpedition(res: SaveExpeditionResponse) {
 
   return buf;
 }
+
+function saveExpedition2(res: SaveExpeditionResponse2): Buffer {
+  // absolute unit
+  const buf = Buffer.alloc(0x18ac);
+
+  buf.writeUInt16LE(0x0140, 0x0000);
+
+  return buf;
+}