idz: Push story geometry down into codecs

Sparsify the data model returned from the repository layer. Different
versions of the game can have drastically different dimensions for the
story data grid, so handling those dimensions is best done in the
encoders themselves.

src/idz/userdb/decoder/saveProfile2.ts

@@ -1,6 +1,7 @@
 import { car } from "./_car";
 import { mission } from "./_mission";
 import { BackgroundCode, CourseNo, TitleCode } from "../model/base";
+import { StoryCell, StoryRow } from "../model/story";
 import { SaveProfileRequest } from "../request/saveProfile";
 import { bitmap } from "./_bitmap";
 import { AimeId } from "../../../model";
@@ -9,10 +10,10 @@ saveProfile2.msgCode = 0x0068;
 saveProfile2.msgLen = 0x0940;
 
 export function saveProfile2(buf: Buffer): SaveProfileRequest {
-  const storyRows = new Array();
+  const storyRows = new Map<number, StoryRow>();
 
   for (let i = 0; i < 9; i++) {
-    const cells = new Array();
+    const cells = new Map<number, StoryCell>();
     const rowOffset = 0x01a8 + i * 0x3c;
 
     for (let j = 0; j < 9; j++) {
@@ -20,12 +21,12 @@ export function saveProfile2(buf: Buffer): SaveProfileRequest {
       const b = buf.readUInt16LE(rowOffset + 0x28 + j * 2);
       const cell = { a, b };
 
-      cells.push(cell);
+      cells.set(j, cell);
     }
 
     const row = { cells };
 
-    storyRows.push(row);
+    storyRows.set(i, row);
   }
 
   const coursePlays = new Map<CourseNo, number>();

src/idz/userdb/decoder/saveProfile3.ts

@@ -1,6 +1,7 @@
 import { car } from "./_car";
 import { mission } from "./_mission";
 import { BackgroundCode, CourseNo, TitleCode } from "../model/base";
+import { StoryCell, StoryRow } from "../model/story";
 import { SaveProfileRequest } from "../request/saveProfile";
 import { bitmap } from "./_bitmap";
 import { AimeId } from "../../../model";
@@ -9,12 +10,12 @@ saveProfile3.msgCode = 0x0138;
 saveProfile3.msgLen = 0x0a70;
 
 export function saveProfile3(buf: Buffer): SaveProfileRequest {
-  const storyRows = new Array();
+  const storyRows = new Map<number, StoryRow>();
 
   // Story layout has changed somewhat...
 
   for (let i = 0; i < 27; i++) {
-    const cells = new Array();
+    const cells = new Map<number, StoryCell>();
     const rowOffset = 0x01ac + i * 0x18;
 
     for (let j = 0; j < 9; j++) {
@@ -22,12 +23,12 @@ export function saveProfile3(buf: Buffer): SaveProfileRequest {
       const b = buf.readUInt8(rowOffset + 0x09 + j);
       const cell = { a, b };
 
-      cells.push(cell);
+      cells.set(j, cell);
     }
 
     const row = { cells };
 
-    storyRows.push(row);
+    storyRows.set(i, row);
   }
 
   const coursePlays = new Map<CourseNo, number>();