Cleaned up the frame.ts by splitting payload parsing to subpackages

test/payload.thirdparty.test.ts

@@ -0,0 +1,37 @@
+import { Dissected } from "@hamradio/packet";
+import { describe, expect, it } from "vitest";
+
+import { Frame } from "../src/frame";
+import { DataType, type UserDefinedPayload } from "../src/frame.types";
+
+describe("Frame.decodeUserDefined", () => {
+  it("parses packet type only", () => {
+    const data = "CALL>APRS:{01";
+    const frame = Frame.fromString(data);
+    const decoded = frame.decode() as UserDefinedPayload;
+    expect(decoded).not.toBeNull();
+    expect(decoded.type).toBe(DataType.UserDefined);
+    expect(decoded.userPacketType).toBe("01");
+    expect(decoded.data).toBe("");
+  });
+
+  it("parses packet type and data and emits sections", () => {
+    const data = "CALL>APRS:{TEX Hello world";
+    const frame = Frame.fromString(data);
+    const res = frame.decode(true) as {
+      payload: UserDefinedPayload;
+      structure: Dissected;
+    };
+    expect(res.payload).not.toBeNull();
+    expect(res.payload.type).toBe(DataType.UserDefined);
+    expect(res.payload.userPacketType).toBe("TEX");
+    expect(res.payload.data).toBe("Hello world");
+
+    const raw = res.structure.find((s) => s.name === "user-defined");
+    const typeSection = res.structure.find((s) => s.name === "user-packet-type");
+    const dataSection = res.structure.find((s) => s.name === "user-data");
+    expect(raw).toBeDefined();
+    expect(typeSection).toBeDefined();
+    expect(dataSection).toBeDefined();
+  });
+});