.gitignore

@@ -20,3 +20,10 @@ yarn-error.log*
 *.njsproj
 *.sln
 *.sw?
+
+/src/KgmWasm/build
+/src/KgmWasm/build
+/src/KgmWasm/*.js
+/src/KgmWasm/*.wasm
+/src/QmcWasm/*.js
+/src/QmcWasm/*.wasm

src/decrypt/index.ts

@@ -1,3 +1,4 @@
+import { Decrypt as Mg3dDecrypt } from '@/decrypt/mg3d';
 import { Decrypt as NcmDecrypt } from '@/decrypt/ncm';
 import { Decrypt as NcmCacheDecrypt } from '@/decrypt/ncmcache';
 import { Decrypt as XmDecrypt } from '@/decrypt/xm';
@@ -22,6 +23,9 @@ export async function Decrypt(file: FileInfo, config: Record<string, any>): Prom
   const raw = SplitFilename(file.name);
   let rt_data: DecryptResult;
   switch (raw.ext) {
+    case 'mg3d': // Migu Wav
+      rt_data = await Mg3dDecrypt(file.raw, raw.name);
+      break;
     case 'ncm': // Netease Mp3/Flac
       rt_data = await NcmDecrypt(file.raw, raw.name, raw.ext);
       break;

src/decrypt/kgm.ts

@@ -63,7 +63,7 @@ export async function Decrypt(file: File, raw_filename: string, raw_ext: string)
   const mime = AudioMimeType[ext];
   let musicBlob = new Blob([musicDecoded], { type: mime });
   const musicMeta = await metaParseBlob(musicBlob);
-  const { title, artist } = GetMetaFromFile(raw_filename, musicMeta.common.title, musicMeta.common.artists == undefined ? musicMeta.common.artist : musicMeta.common.artists.toString());
+  const { title, artist } = GetMetaFromFile(raw_filename, musicMeta.common.title, String(musicMeta.common.artists || musicMeta.common.artist || ""));
   return {
     album: musicMeta.common.album,
     picture: GetCoverFromFile(musicMeta),

src/decrypt/kwm.ts

@@ -38,7 +38,7 @@ export async function Decrypt(file: File, raw_filename: string, _: string): Prom
   let musicBlob = new Blob([audioData], { type: mime });
 
   const musicMeta = await metaParseBlob(musicBlob);
-  const { title, artist } = GetMetaFromFile(raw_filename, musicMeta.common.title, musicMeta.common.artists == undefined ? musicMeta.common.artist : musicMeta.common.artists.toString());
+  const { title, artist } = GetMetaFromFile(raw_filename, musicMeta.common.title, String(musicMeta.common.artists || musicMeta.common.artist || ""));
   return {
     album: musicMeta.common.album,
     picture: GetCoverFromFile(musicMeta),

src/decrypt/mg3d.ts

@@ -0,0 +1,71 @@
+import { Decrypt as RawDecrypt } from './raw';
+import { GetArrayBuffer } from '@/decrypt/utils';
+import { DecryptResult } from '@/decrypt/entity';
+
+const segmentSize = 0x20;
+
+function isPrintableAsciiChar(ch: number) {
+    return ch >= 0x20 && ch <= 0x7E;
+}
+
+function isUpperHexChar(ch: number) {
+    return (ch >= 0x30 && ch <= 0x39) || (ch >= 0x41 && ch <= 0x46);
+}
+
+/**
+ * @param {Buffer} data 
+ * @param {Buffer} key 
+ * @param {boolean} copy 
+ * @returns Buffer
+ */
+function decryptSegment(data: Uint8Array, key: Uint8Array) {
+    for (let i = 0; i < data.byteLength; i++) {
+      data[i] -= key[i % segmentSize];
+    }
+    return Buffer.from(data);
+}
+
+export async function Decrypt(file: File, raw_filename: string): Promise<DecryptResult> {
+  const buf = new Uint8Array(await GetArrayBuffer(file));
+
+  // 咪咕编码的 WAV 文件有很多“空洞”内容，尝试密钥。
+  const header = buf.slice(0, 0x100);
+  const bytesRIFF = Buffer.from('RIFF', 'ascii');
+  const bytesWaveFormat = Buffer.from('WAVEfmt ', 'ascii');
+  const possibleKeys = [];
+  
+  for (let i = segmentSize; i < segmentSize * 20; i += segmentSize) {
+      const possibleKey = buf.slice(i, i + segmentSize);
+      if (!possibleKey.every(isUpperHexChar)) continue;
+  
+      const tempHeader = decryptSegment(header, possibleKey);
+      if (tempHeader.slice(0, 4).compare(bytesRIFF)) continue;
+      if (tempHeader.slice(8, 16).compare(bytesWaveFormat)) continue;
+      
+      // fmt chunk 大小可以是 16 / 18 / 40。
+      const fmtChunkSize = tempHeader.readUInt32LE(0x10);
+      if (![16, 18, 40].includes(fmtChunkSize)) continue;
+  
+      // 下一个 chunk
+      const firstDataChunkOffset = 0x14 + fmtChunkSize;
+      const chunkName = tempHeader.slice(firstDataChunkOffset, firstDataChunkOffset + 4);
+      if (!chunkName.every(isPrintableAsciiChar)) continue;
+  
+      const secondDataChunkOffset = firstDataChunkOffset + 8 + tempHeader.readUInt32LE(firstDataChunkOffset + 4);
+      if (secondDataChunkOffset <= header.byteLength) {
+          const secondChunkName = tempHeader.slice(secondDataChunkOffset, secondDataChunkOffset + 4);
+          if (!secondChunkName.every(isPrintableAsciiChar)) continue;
+      }
+  
+      possibleKeys.push(Buffer.from(possibleKey).toString('ascii'));
+  }
+  
+  if (possibleKeys.length <= 0) {
+    throw new Error(`ERROR: no suitable key discovered`);
+  }
+  
+  const decryptionKey = Buffer.from(possibleKeys[0], 'ascii');
+  decryptSegment(buf, decryptionKey);
+  const musicData = new Blob([buf], { type: 'audio/x-wav' });
+  return await RawDecrypt(musicData, raw_filename, 'wav', false);
+}

src/decrypt/ncmcache.ts

@@ -13,7 +13,7 @@ export async function Decrypt(file: Blob, raw_filename: string, raw_ext: string)
   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.artists == undefined ? tag.common.artist : tag.common.artists.toString());
+  const { title, artist } = GetMetaFromFile(raw_filename, tag.common.title, String(tag.common.artists || tag.common.artist || ""));
 
   return {
     title,

src/decrypt/qmccache.ts

@@ -54,7 +54,7 @@ export async function Decrypt(file: Blob, raw_filename: string, raw_ext: string)
     throw '不支持的QQ音乐缓存格式';
   }
   const tag = await metaParseBlob(audioBlob);
-  const { title, artist } = GetMetaFromFile(raw_filename, tag.common.title, String(tag.common.artists || tag.common.artist));
+  const { title, artist } = GetMetaFromFile(raw_filename, tag.common.title, String(tag.common.artists || tag.common.artist || ""));
 
   return {
     title,

src/decrypt/raw.ts

@@ -17,7 +17,7 @@ export async function Decrypt(
     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, String(tag.common.artists || tag.common.artist));
+  const { title, artist } = GetMetaFromFile(raw_filename, tag.common.title, String(tag.common.artists || tag.common.artist || ''));
 
   return {
     title,

src/decrypt/xm.ts

@@ -49,7 +49,7 @@ export async function Decrypt(file: File, raw_filename: string, raw_ext: string)
   const { title, artist } = GetMetaFromFile(
     raw_filename,
     musicMeta.common.title,
-    String(musicMeta.common.artists || musicMeta.common.artist),
+    String(musicMeta.common.artists || musicMeta.common.artist || ""),
     raw_filename.indexOf('_') === -1 ? '-' : '_',
   );
 

src/utils/qm_meta.ts

@@ -20,6 +20,8 @@ interface MetaResult {
   blob: Blob;
 }
 
+const fromGBK = (text?: string) => iconv.decode(new Buffer(text || ''), 'gbk');
+
 /**
  *
  * @param musicBlob 音乐文件（解密后）
@@ -41,14 +43,13 @@ export async function extractQQMusicMeta(
       console.warn('try using gbk encoding to decode meta');
       musicMeta.common.artist = '';
       if (!musicMeta.common.artists) {
-        musicMeta.common.artist = iconv.decode(new Buffer(musicMeta.common.artist ?? ''), 'gbk');
+        musicMeta.common.artist = fromGBK(musicMeta.common.artist);
       }
       else {
-        musicMeta.common.artists.forEach((artist) => artist = iconv.decode(new Buffer(artist ?? ''), 'gbk'));
-        musicMeta.common.artist = musicMeta.common.artists.toString();
+        musicMeta.common.artist = musicMeta.common.artists.map(fromGBK).join();
       }
-      musicMeta.common.title = iconv.decode(new Buffer(musicMeta.common.title ?? ''), 'gbk');
-      musicMeta.common.album = iconv.decode(new Buffer(musicMeta.common.album ?? ''), 'gbk');
+      musicMeta.common.title = fromGBK(musicMeta.common.title);
+      musicMeta.common.album = fromGBK(musicMeta.common.album);
     }
   }