From d070332f9862c37b4edb91c9470ca66c2031e60f Mon Sep 17 00:00:00 2001
From: Jixun Wu <jixun.moe@gmail.com>
Date: Sun, 18 Jun 2023 18:00:31 +0100
Subject: [PATCH] fix: support files that were not encrypted (e.g. `kgma`),
 close #36

---
 src/decrypt-worker/crypto/CryptoFactory.ts         |  4 ++++
 .../crypto/transparent/transparent.ts              | 14 ++++++++++++++
 2 files changed, 18 insertions(+)
 create mode 100644 src/decrypt-worker/crypto/transparent/transparent.ts

diff --git a/src/decrypt-worker/crypto/CryptoFactory.ts b/src/decrypt-worker/crypto/CryptoFactory.ts
index 9fa4999..66a9ec4 100644
--- a/src/decrypt-worker/crypto/CryptoFactory.ts
+++ b/src/decrypt-worker/crypto/CryptoFactory.ts
@@ -8,6 +8,7 @@ import { NCMCrypto } from './ncm/ncm_pc';
 import { XimalayaAndroidCrypto } from './xmly/xmly_android';
 import { KWMCrypto } from './kwm/kwm';
 import { MiguCrypto } from './migu/migu3d_keyless';
+import { TransparentCrypto } from './transparent/transparent';
 
 export const allCryptoFactories: CryptoFactory[] = [
   // Xiami (*.xm)
@@ -38,4 +39,7 @@ export const allCryptoFactories: CryptoFactory[] = [
   // Ximalaya (Android)
   XimalayaAndroidCrypto.makeX2M,
   XimalayaAndroidCrypto.makeX3M,
+
+  // Transparent crypto (not encrypted)
+  TransparentCrypto.make,
 ];
diff --git a/src/decrypt-worker/crypto/transparent/transparent.ts b/src/decrypt-worker/crypto/transparent/transparent.ts
new file mode 100644
index 0000000..78332d3
--- /dev/null
+++ b/src/decrypt-worker/crypto/transparent/transparent.ts
@@ -0,0 +1,14 @@
+import type { CryptoBase } from '../CryptoBase';
+
+export class TransparentCrypto implements CryptoBase {
+  cryptoName = 'Transparent';
+  checkByDecryptHeader = true;
+
+  async decrypt(buffer: ArrayBuffer): Promise<Blob> {
+    return new Blob([buffer]);
+  }
+
+  public static make() {
+    return new TransparentCrypto();
+  }
+}