idz: Dispatch on declared protocol version

src/idz/userdb/encoder/saveExpedition.ts

@@ -1,25 +1,6 @@
-import {
-  SaveExpeditionResponse,
-  SaveExpeditionResponse1,
-  SaveExpeditionResponse2,
-} from "../response/saveExpedition";
+import { SaveExpeditionResponse } from "../response/saveExpedition";
 
-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 {
+export function saveExpedition1(res: SaveExpeditionResponse): Buffer {
   // in awe of the size of this lad
   const buf = Buffer.alloc(0x17c0);
 
@@ -28,7 +9,7 @@ function saveExpedition1(res: SaveExpeditionResponse1): Buffer {
   return buf;
 }
 
-function saveExpedition2(res: SaveExpeditionResponse2): Buffer {
+export function saveExpedition2(res: SaveExpeditionResponse): Buffer {
   // absolute unit
   const buf = Buffer.alloc(0x18ac);