From 48f879cb5828442cdd4032b039472e496468ca0e Mon Sep 17 00:00:00 2001
From: Emmm Monster <58943012+emmmx@users.noreply.github.com>
Date: Thu, 3 Jun 2021 12:47:51 +0800
Subject: [PATCH] simplify: decrypt/ncm-cache & decrypt/common

---
 src/decrypt/common.ts   | 30 +++++++++++++++---------------
 src/decrypt/ncmcache.ts | 17 +++++++----------
 2 files changed, 22 insertions(+), 25 deletions(-)

diff --git a/src/decrypt/common.ts b/src/decrypt/common.ts
index 8e2142d..3f4368c 100644
--- a/src/decrypt/common.ts
+++ b/src/decrypt/common.ts
@@ -8,35 +8,35 @@ import {Decrypt as KwmDecrypt} from "@/decrypt/kwm";
 import {Decrypt as RawDecrypt} from "@/decrypt/raw";
 import {Decrypt as TmDecrypt} from "@/decrypt/tm";
 import {DecryptResult, FileInfo} from "@/decrypt/entity";
+import {SplitFilename} from "@/decrypt/utils";
 
 
 export async function CommonDecrypt(file: FileInfo): Promise<DecryptResult> {
-    let raw_ext = file.name.substring(file.name.lastIndexOf(".") + 1, file.name.length).toLowerCase();
-    let raw_filename = file.name.substring(0, file.name.lastIndexOf("."));
+    const raw = SplitFilename(file.name)
     let rt_data: DecryptResult;
-    switch (raw_ext) {
+    switch (raw.ext) {
         case "ncm":// Netease Mp3/Flac
-            rt_data = await NcmDecrypt(file.raw, raw_filename, raw_ext);
+            rt_data = await NcmDecrypt(file.raw, raw.name, raw.ext);
             break;
         case "uc":// Netease Cache
-            rt_data = await NcmCacheDecrypt(file.raw, raw_filename, raw_ext);
+            rt_data = await NcmCacheDecrypt(file.raw, raw.name, raw.ext);
             break;
         case "kwm":// Kuwo Mp3/Flac
-            rt_data = await KwmDecrypt(file.raw, raw_filename, raw_ext);
+            rt_data = await KwmDecrypt(file.raw, raw.name, raw.ext);
             break
         case "xm": // Xiami Wav/M4a/Mp3/Flac
         case "wav":// Xiami/Raw Wav
         case "mp3":// Xiami/Raw Mp3
         case "flac":// Xiami/Raw Flac
         case "m4a":// Xiami/Raw M4a
-            rt_data = await XmDecrypt(file.raw, raw_filename, raw_ext);
+            rt_data = await XmDecrypt(file.raw, raw.name, raw.ext);
             break;
         case "ogg":// Raw Ogg
-            rt_data = await RawDecrypt(file.raw, raw_filename, raw_ext);
+            rt_data = await RawDecrypt(file.raw, raw.name, raw.ext);
             break;
         case "tm0":// QQ Music IOS Mp3
         case "tm3":// QQ Music IOS Mp3
-            rt_data = await RawDecrypt(file.raw, raw_filename, "mp3");
+            rt_data = await RawDecrypt(file.raw, raw.name, "mp3");
             break;
         case "qmc3"://QQ Music Android Mp3
         case "qmc2"://QQ Music Android Ogg
@@ -53,26 +53,26 @@ export async function CommonDecrypt(file: FileInfo): Promise<DecryptResult> {
         case "6f6767"://QQ Music Weiyun Ogg
         case "6d3461"://QQ Music Weiyun M4a
         case "776176"://QQ Music Weiyun Wav
-            rt_data = await QmcDecrypt(file.raw, raw_filename, raw_ext);
+            rt_data = await QmcDecrypt(file.raw, raw.name, raw.ext);
             break;
         case "tm2":// QQ Music IOS M4a
         case "tm6":// QQ Music IOS M4a
-            rt_data = await TmDecrypt(file.raw, raw_filename);
+            rt_data = await TmDecrypt(file.raw, raw.name);
             break;
         case "cache"://QQ Music Cache
-            rt_data = await QmcCacheDecrypt(file.raw, raw_filename, raw_ext);
+            rt_data = await QmcCacheDecrypt(file.raw, raw.name, raw.ext);
             break;
         case "vpr":
         case "kgm":
         case "kgma":
-            rt_data = await KgmDecrypt(file.raw, raw_filename, raw_ext);
+            rt_data = await KgmDecrypt(file.raw, raw.name, raw.ext);
             break
         default:
             throw "不支持此文件格式"
     }
 
-    if (!rt_data.rawExt) rt_data.rawExt = raw_ext;
-    if (!rt_data.rawFilename) rt_data.rawFilename = raw_filename;
+    if (!rt_data.rawExt) rt_data.rawExt = raw.ext;
+    if (!rt_data.rawFilename) rt_data.rawFilename = raw.name;
     console.log(rt_data);
     return rt_data;
 }
diff --git a/src/decrypt/ncmcache.ts b/src/decrypt/ncmcache.ts
index 79db62c..f921cc6 100644
--- a/src/decrypt/ncmcache.ts
+++ b/src/decrypt/ncmcache.ts
@@ -4,18 +4,15 @@ import {DecryptResult} from "@/decrypt/entity";
 
 import {parseBlob as metaParseBlob} from "music-metadata-browser";
 
-export async function Decrypt(file: Blob, raw_filename: string, raw_ext: string, detect: boolean = true)
+export async function Decrypt(file: Blob, raw_filename: string, raw_ext: string)
     : Promise<DecryptResult> {
-    let ext = raw_ext;
-    if (detect) {
-        const buffer = new Uint8Array(await GetArrayBuffer(file));
-        let length = buffer.length
-        for (let i = 0; i < length; i++) {
-             buffer[i] ^= 163
-        }
-        ext = SniffAudioExt(buffer, raw_ext);
-        if (ext !== raw_ext) file = new Blob([buffer], {type: AudioMimeType[ext]})
+    const buffer = new Uint8Array(await GetArrayBuffer(file));
+    let length = buffer.length
+    for (let i = 0; i < length; i++) {
+        buffer[i] ^= 163
     }
+    const ext = SniffAudioExt(buffer, raw_ext);
+    if (ext !== raw_ext) file = new Blob([buffer], {type: AudioMimeType[ext]})
     const tag = await metaParseBlob(file);
     const {title, artist} = GetMetaFromFile(raw_filename, tag.common.title, tag.common.artist)