Decode non-ANSII strings only on backend

Signed-off-by: xychen <xychen@listenai.com>

src/utils/cskburn.ts

@@ -1,5 +1,6 @@
 import { Command } from '@tauri-apps/plugin-shell';
-import { invoke } from '@tauri-apps/api/core';
+
+import { decode } from './strings';
 
 type ICSKBurnEventHandlers = Partial<{
   onOutput: (output: string) => void;
@@ -76,13 +77,13 @@ export async function cskburn(
     }
 
     command.stdout.on('data', async (data: Uint8Array) => {
-      const line = await invoke('decode', { data });
+      const line = await decode(data);
       outputs.push(line.trim());
       handleOutput(line);
     });
 
     command.stderr.on('data', async (data: Uint8Array) => {
-      const line = await invoke('decode', { data });
+      const line = await decode(data);
       outputs.push(line.trim());
       handleOutput(line);
     });

src/utils/strings.ts

@@ -0,0 +1,11 @@
+import { invoke } from '@tauri-apps/api/core';
+
+export async function decode(data: ArrayLike<number>): Promise<string> {
+  // IPC is expensive, so we should avoid it if possible.
+  const isPureAscii = Array.from(data).every((c) => c < 0x80);
+  if (isPureAscii) {
+    return new TextDecoder().decode(new Uint8Array(data));
+  }
+
+  return await invoke('decode', { data });
+}