fix(android): decode guardian output as UTF-8 streams

src/android/JadxWorkspaceRoot.test.ts

@@ -0,0 +1,89 @@
+import { EventEmitter } from "node:events";
+import { win32 } from "node:path";
+import { PassThrough } from "node:stream";
+
+import { afterEach, expect, it, vi } from "vitest";
+
+const { spawnMock, tmpdirMock, lstatMock } = vi.hoisted(() => ({
+  spawnMock: vi.fn(),
+  tmpdirMock: vi.fn(),
+  lstatMock: vi.fn(),
+}));
+
+vi.mock("node:child_process", async (importOriginal) => ({
+  ...(await importOriginal<typeof import("node:child_process")>()),
+  spawn: spawnMock,
+}));
+vi.mock("node:os", async (importOriginal) => ({
+  ...(await importOriginal<typeof import("node:os")>()),
+  tmpdir: tmpdirMock,
+}));
+vi.mock("node:fs/promises", async (importOriginal) => ({
+  ...(await importOriginal<typeof import("node:fs/promises")>()),
+  lstat: lstatMock,
+}));
+
+import { createJadxWorkspaceRoot } from "./JadxWorkspaceRoot.js";
+
+afterEach(() => {
+  vi.restoreAllMocks();
+  vi.clearAllMocks();
+});
+
+it("decodes a Windows guardian path across split UTF-8 stdout writes", async () => {
+  const previousPlatform = process.platform;
+  Object.defineProperty(process, "platform", {
+    configurable: true,
+    value: "win32",
+  });
+  const parent = "C:\\Users\\研究者\\AppData\\Local\\Temp";
+  const path = win32.join(parent, `rea-android-${"a".repeat(32)}`);
+  const child = Object.assign(new EventEmitter(), {
+    stdin: new PassThrough(),
+    stdout: new PassThrough(),
+    stderr: new PassThrough(),
+    unref: vi.fn(),
+  });
+  child.stdin.once("finish", () => {
+    child.stdout.end();
+    child.stderr.end();
+    child.emit("close", 0, null);
+  });
+  tmpdirMock.mockReturnValue(parent);
+  const missingPath = Object.assign(new Error("missing after cleanup"), {
+    code: "ENOENT",
+  });
+  lstatMock.mockRejectedValue(missingPath);
+  spawnMock.mockReturnValue(child);
+  const ready = Buffer.from(
+    `${JSON.stringify({
+      path,
+      volumeSerial: "0123456789abcdef",
+      fileId: "0123456789abcdef0123456789abcdef",
+      privateDacl: true,
+    })}\n`,
+  );
+  const split = ready.indexOf(Buffer.from("研")) + 1;
+
+  try {
+    const start = createJadxWorkspaceRoot();
+    setImmediate(() => {
+      child.stdout.write(ready.subarray(0, split), () => {
+        setImmediate(() => child.stdout.write(ready.subarray(split)));
+      });
+    });
+
+    const root = await start;
+    try {
+      expect(root.path).toBe(path);
+    } finally {
+      await expect(root.close()).resolves.toBeUndefined();
+    }
+    expect(lstatMock).toHaveBeenCalledWith(path);
+  } finally {
+    Object.defineProperty(process, "platform", {
+      configurable: true,
+      value: previousPlatform,
+    });
+  }
+});

src/android/JadxWorkspaceRoot.ts

@@ -105,8 +105,9 @@ class WindowsJadxWorkspaceRoot implements JadxWorkspaceRoot {
       },
     });
     let diagnostics = "";
-    child.stderr.on("data", (chunk: Buffer) => {
-      diagnostics = (diagnostics + chunk.toString()).slice(-8192);
+    child.stderr.setEncoding("utf8");
+    child.stderr.on("data", (chunk: string) => {
+      diagnostics = (diagnostics + chunk).slice(-8192);
     });
     const exit = new Promise<GuardianExit>((resolve) => {
       child.once("error", (error: Error) =>
@@ -116,8 +117,9 @@ class WindowsJadxWorkspaceRoot implements JadxWorkspaceRoot {
     });
     const ready = new Promise<string>((resolve, reject) => {
       let frame = "";
-      child.stdout.on("data", (chunk: Buffer) => {
-        frame += chunk.toString();
+      child.stdout.setEncoding("utf8");
+      child.stdout.on("data", (chunk: string) => {
+        frame += chunk;
         if (frame.length > 4096) {
           reject(
             new Error("Android workspace guardian readiness exceeded 4 KiB"),