增加对网易云音乐.uc缓存格式和QQ音乐.cache缓存格式的支持 (#161)

* Update common.ts

* Create ncmcache.ts

* Create qmccache.ts

src/decrypt/qmccache.ts

@@ -0,0 +1,44 @@
+import {AudioMimeType, GetArrayBuffer, GetCoverFromFile, GetMetaFromFile, SniffAudioExt} from "@/decrypt/utils.ts";
+
+import {Decrypt as QmcDecrypt} from "@/decrypt/qmc";
+
+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)
+    : 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] ^= 0xf4
+             if(buffer[i] <= 0x3f)buffer[i] = buffer[i] * 4;
+             else if(buffer[i] <= 0x7f)buffer[i] = (buffer[i] - 0x40) * 4 + 1;
+             else if(buffer[i] <= 0xbf)buffer[i] = (buffer[i] - 0x80) * 4 + 2;
+             else buffer[i] = (buffer[i] - 0xc0) * 4 + 3;
+        }
+        ext = SniffAudioExt(buffer, raw_ext);
+        if (ext !== raw_ext) file = new Blob([buffer], {type: AudioMimeType[ext]})
+        else {
+            file = new Blob([buffer], {type: "application/octet-stream"})
+            let ext = raw_filename.substring(file.name.lastIndexOf(".") + 1, file.name.length).toLowerCase();
+            if (ext !== "mgg" && ext !== "mflac") throw "不支持的QQ音乐缓存格式：" + raw_filename + ".cache";
+            return QmcDecrypt(file, raw_filename, ext+".cache");
+        }
+    }
+    const tag = await metaParseBlob(file);
+    const {title, artist} = GetMetaFromFile(raw_filename, tag.common.title, tag.common.artist)
+
+    return {
+        title,
+        artist,
+        ext,
+        album: tag.common.album,
+        picture: GetCoverFromFile(tag),
+        file: URL.createObjectURL(file),
+        blob: file,
+        mime: AudioMimeType[ext]
+    }
+}