feat(kgm): kgm v5 (aka. kgg) support

src/decrypt-worker/worker/kugou_parse_header.ts

@@ -0,0 +1,23 @@
+import {
+  ParseKugouHeaderPayload, ParseKugouHeaderResponse,
+
+} from '~/decrypt-worker/types.ts';
+import { KuGouHeader } from '@unlock-music/crypto';
+
+export const workerParseKugouHeader = async ({ blobURI }: ParseKugouHeaderPayload): Promise<ParseKugouHeaderResponse> => {
+  const blob = await fetch(blobURI, { headers: { Range: 'bytes=0-1023' } }).then((r) => r.blob());
+  const arrayBuffer = await blob.arrayBuffer();
+  const buffer = new Uint8Array(arrayBuffer.slice(0, 0x400));
+
+  let kwm : KuGouHeader | undefined;
+
+  try {
+    kwm = new KuGouHeader(buffer);
+    const { version, audioHash } = kwm;
+    return { version, audioHash };
+  } catch {
+    return null;
+  } finally {
+    kwm?.free();
+  }
+}