Add Support For Xiami .xm Files!

src/decrypt/common.js

@@ -1,5 +1,6 @@
 const NcmDecrypt = require("./ncm");
 const KwmDecrypt = require("./kwm");
+const XmDecrypt = require("./xm");
 const QmcDecrypt = require("./qmc");
 const RawDecrypt = require("./raw");
 const TmDecrypt = require("./tm");
@@ -15,9 +16,13 @@ export async function CommonDecrypt(file) {
         case "kwm":// Kuwo Mp3/Flac
             rt_data = await KwmDecrypt.Decrypt(file.raw, raw_filename, raw_ext);
             break
-        case "mp3":// Raw Mp3
+        case "xm": // Xiami Wav/M4a/Mp3/Flac
-        case "flac"://Raw Flac
+        case "wav":// Xiami/Raw Wav
-        case "m4a":// Raw M4a
+        case "mp3":// Xiami/Raw Mp3
+        case "flac":// Xiami/Raw Flac
+        case "m4a":// Xiami/Raw M4a
+            rt_data = await XmDecrypt.Decrypt(file.raw, raw_filename, raw_ext);
+            break;
         case "ogg":// Raw Ogg
             rt_data = await RawDecrypt.Decrypt(file.raw, raw_filename, raw_ext);
             break;

src/decrypt/util.js

@@ -7,11 +7,14 @@ export const WMA_HEADER = [
     0x30, 0x26, 0xB2, 0x75, 0x8E, 0x66, 0xCF, 0x11,
     0xA6, 0xD9, 0x00, 0xAA, 0x00, 0x62, 0xCE, 0x6C,
 ]
+export const WAV_HEADER = [0x52, 0x49, 0x46, 0x46]
 export const AudioMimeType = {
     mp3: "audio/mpeg",
     flac: "audio/flac",
     m4a: "audio/mp4",
-    ogg: "audio/ogg"
+    ogg: "audio/ogg",
+    wma: "audio/x-ms-wma",
+    wav: "audio/x-wav"
 };
 
 // Also a new draft API: blob.arrayBuffer()
@@ -25,9 +28,9 @@ export async function GetArrayBuffer(blobObject) {
     });
 }
 
-export function GetFileInfo(artist, title, filenameNoExt) {
+export function GetFileInfo(artist, title, filenameNoExt, separator = "-") {
     let newArtist = "", newTitle = "";
-    let filenameArray = filenameNoExt.split("-");
+    let filenameArray = filenameNoExt.split(separator);
     if (filenameArray.length > 1) {
         newArtist = filenameArray[0].trim();
         newTitle = filenameArray[1].trim();
@@ -68,6 +71,7 @@ export function DetectAudioExt(data, fallbackExt) {
     if (IsBytesEqual(OGG_HEADER, data.slice(0, OGG_HEADER.length))) return "ogg";
     if (IsBytesEqual(M4A_HEADER, data.slice(4, 4 + M4A_HEADER.length))) return "m4a";
     if (IsBytesEqual(WMA_HEADER, data.slice(0, WMA_HEADER.length))) return "wma";
+    if (IsBytesEqual(WAV_HEADER, data.slice(0, WAV_HEADER.length))) return "wav";
     return fallbackExt;
 }
 

src/decrypt/xm.js

@@ -0,0 +1,72 @@
+import {
+    AudioMimeType,
+    DetectAudioExt,
+    GetArrayBuffer,
+    GetFileInfo,
+    GetMetaCoverURL,
+    IsBytesEqual
+} from "./util";
+
+import {Decrypt as RawDecrypt} from "./raw";
+
+const musicMetadata = require("music-metadata-browser");
+const MagicHeader = [0x69, 0x66, 0x6D, 0x74]
+const MagicHeader2 = [0xfe, 0xfe, 0xfe, 0xfe]
+const FileTypeMap = {
+    " WAV": ".wav",
+    "FLAC": ".flac",
+    " MP3": ".mp3",
+    " A4M": ".m4a",
+}
+
+export async function Decrypt(file, raw_filename, raw_ext) {
+    const oriData = new Uint8Array(await GetArrayBuffer(file));
+    if (!IsBytesEqual(MagicHeader, oriData.slice(0, 4)) ||
+        !IsBytesEqual(MagicHeader2, oriData.slice(8, 12))) {
+        if (raw_ext === "xm") {
+            return {status: false, message: "Not a valid xm file!"}
+        } else {
+            return await RawDecrypt(file, raw_filename, raw_ext, true)
+        }
+    }
+
+    let typeText = (new TextDecoder()).decode(oriData.slice(4, 8))
+    if (!FileTypeMap.hasOwnProperty(typeText)) {
+        return {status: false, message: "New Xiami file category!"}
+    }
+
+    let key = oriData[0xf]
+    let dataOffset = oriData[0xc] | oriData[0xd] << 8
+    let audioData = oriData.slice(0x10);
+    let lenAudioData = audioData.length;
+    for (let cur = dataOffset; cur < lenAudioData; ++cur)
+        audioData[cur] = (audioData[cur] - key) ^ 0xff;
+
+    const ext = DetectAudioExt(audioData, "mp3");
+    const mime = AudioMimeType[ext];
+    let musicBlob = new Blob([audioData], {type: mime});
+
+    const musicMeta = await musicMetadata.parseBlob(musicBlob);
+    if (ext === "wav") {
+        //todo:未知的编码方式
+        musicMeta.common.album = "";
+        musicMeta.common.artist = "";
+        musicMeta.common.title = "";
+    }
+
+    const info = GetFileInfo(musicMeta.common.artist, musicMeta.common.title, raw_filename, "_");
+
+    const imgUrl = GetMetaCoverURL(musicMeta);
+
+    return {
+        status: true,
+        title: info.title,
+        artist: info.artist,
+        ext: ext,
+        album: musicMeta.common.album,
+        picture: imgUrl,
+        file: URL.createObjectURL(musicBlob),
+        mime: mime
+    }
+}
+