idz: Hoist userdb code

src/idz/userdb/encoder/loadGeneralReward.ts

@@ -0,0 +1,29 @@
+import iconv from "iconv-lite";
+
+import { LoadGeneralRewardResponse } from "../response/loadGeneralReward";
+
+export function loadGeneralReward(res: LoadGeneralRewardResponse) {
+  const buf = Buffer.alloc(0x0330);
+
+  buf.writeInt16LE(0x009d, 0x0000);
+
+  // Traversal code shat out by MSVC uses shifted pointers and neither the
+  // beginning nor the end of each entry in this array gets read, so the true
+  // start of the array and offsets of each item's fields are still uncertain.
+
+  for (let i = 0; i < 10 && i < res.items.length; i++) {
+    const item = res.items[i];
+    const base = 0x04 + 0x50 * i;
+
+    iconv.encode(item.field_04, "shift_jis").copy(buf, base + 0x04);
+    buf.writeUInt32LE(item.field_2C, base + 0x2c);
+    buf.writeUInt8(item.field_38, base + 0x38);
+    buf.writeUInt8(item.field_39, base + 0x39);
+
+    for (let j = 0; j < 4 && j < item.field_3C.length; j++) {
+      buf.writeUInt32LE(item.field_3C[j], base + 0x3c + 4 * j);
+    }
+  }
+
+  return buf;
+}