feat: initial implementation of qtfm android

src/decrypt-worker/crypto/CryptoFactory.ts

@@ -9,6 +9,7 @@ import { XimalayaAndroidCrypto } from './xmly/xmly_android';
 import { KWMCrypto } from './kwm/kwm';
 import { MiguCrypto } from './migu/migu3d_keyless';
 import { TransparentCrypto } from './transparent/transparent';
+import { QingTingFM$Device } from './qtfm/qtfm_device';
 
 export const allCryptoFactories: CryptoFactory[] = [
   // Xiami (*.xm)
@@ -40,6 +41,9 @@ export const allCryptoFactories: CryptoFactory[] = [
   XimalayaAndroidCrypto.makeX2M,
   XimalayaAndroidCrypto.makeX3M,
 
+  // QingTingFM (Android)
+  QingTingFM$Device.make,
+
   // Transparent crypto (not encrypted)
   TransparentCrypto.make,
 ];

src/decrypt-worker/crypto/qtfm/qtfm_device.ts

@@ -0,0 +1,25 @@
+import { transformBlob } from '~/decrypt-worker/util/transformBlob';
+import type { CryptoBase } from '../CryptoBase';
+import { DecryptCommandOptions } from '~/decrypt-worker/types';
+
+export class QingTingFM$Device implements CryptoBase {
+  cryptoName = 'QingTing FM/Device ID';
+  checkByDecryptHeader = false;
+
+  async checkBySignature(_buffer: ArrayBuffer, options: DecryptCommandOptions) {
+    return Boolean(/^\.p~?!.*\.qta$/.test(options.fileName) && options.qingTingAndroidDevice);
+  }
+
+  async decrypt(buffer: ArrayBuffer, options: DecryptCommandOptions): Promise<Blob> {
+    const { fileName: name, qingTingAndroidDevice: qingTingDevice } = options;
+    if (!qingTingDevice) {
+      throw new Error('QingTingFM Device Info was not provided');
+    }
+
+    return transformBlob(buffer, (p) => p.make.QingTingFM(name, qingTingDevice));
+  }
+
+  public static make() {
+    return new QingTingFM$Device();
+  }
+}