feature: use online info to correct qmc meta
(cherry picked from commit 7c62f35adb268509f543d67b4a36f49ada3ae206)
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@ -1,6 +1,5 @@
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import { QmcMapCipher, QmcRC4Cipher, QmcStaticCipher, QmcStreamCipher } from './qmc_cipher';
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import { AudioMimeType, GetArrayBuffer, SniffAudioExt } from '@/decrypt/utils';
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import { DecryptQMCWasm } from './qmc_wasm';
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import { DecryptResult } from '@/decrypt/entity';
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import { QmcDeriveKey } from '@/decrypt/qmc_key';
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@ -42,20 +41,24 @@ export async function Decrypt(file: Blob, raw_filename: string, raw_ext: string)
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const fileBuffer = await GetArrayBuffer(file);
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let musicDecoded: Uint8Array | undefined;
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let musicID: number | undefined;
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// todo: wasm decoder doesn't support extract the song id for .mgg1/.mflac0 currently
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// if (version === 2 && globalThis.WebAssembly) {
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// console.log('qmc: using wasm decoder');
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// const v2Decrypted = await DecryptQMCWasm(fileBuffer);
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// // 如果 v2 检测失败,降级到 v1 再尝试一次
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// if (v2Decrypted) {
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// musicDecoded = v2Decrypted;
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// }
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// }
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if (version === 2 && globalThis.WebAssembly) {
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console.log('qmc: using wasm decoder');
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const v2Decrypted = await DecryptQMCWasm(fileBuffer);
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// 如果 v2 检测失败,降级到 v1 再尝试一次
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if (v2Decrypted) {
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musicDecoded = v2Decrypted;
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}
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}
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if (!musicDecoded) {
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// may throw error
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console.log('qmc: using js decoder');
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const d = new QmcDecoder(new Uint8Array(fileBuffer));
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musicDecoded = d.decrypt();
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musicID = d.songID;
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}
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const ext = SniffAudioExt(musicDecoded, handler.ext);
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@ -65,6 +68,7 @@ export async function Decrypt(file: Blob, raw_filename: string, raw_ext: string)
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new Blob([musicDecoded], { type: mime }),
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raw_filename,
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ext,
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musicID,
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);
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return {
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@ -81,19 +85,25 @@ export async function Decrypt(file: Blob, raw_filename: string, raw_ext: string)
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export class QmcDecoder {
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private static readonly BYTE_COMMA = ','.charCodeAt(0);
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file: Uint8Array;
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size: number;
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decoded: boolean = false;
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audioSize?: number;
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cipher?: QmcStreamCipher;
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private readonly file: Uint8Array;
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private readonly size: number;
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private decoded: boolean = false;
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private audioSize?: number;
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private cipher?: QmcStreamCipher;
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constructor(file: Uint8Array) {
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public constructor(file: Uint8Array) {
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this.file = file;
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this.size = file.length;
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this.searchKey();
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}
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decrypt(): Uint8Array {
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private _songID?: number;
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public get songID() {
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return this._songID;
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}
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public decrypt(): Uint8Array {
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if (!this.cipher) {
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throw new Error('no cipher found');
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}
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@ -118,9 +128,20 @@ export class QmcDecoder {
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const sizeView = new DataView(sizeBuf.buffer, sizeBuf.byteOffset);
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const keySize = sizeView.getUint32(0, false);
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this.audioSize = this.size - keySize - 8;
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const rawKey = this.file.subarray(this.audioSize, this.size - 8);
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const keyEnd = rawKey.findIndex((v) => v == QmcDecoder.BYTE_COMMA);
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if (keyEnd < 0) {
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throw new Error('invalid key: search raw key failed');
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}
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this.setCipher(rawKey.subarray(0, keyEnd));
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const idBuf = rawKey.subarray(keyEnd + 1);
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const idEnd = idBuf.findIndex((v) => v == QmcDecoder.BYTE_COMMA);
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if (keyEnd < 0) {
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throw new Error('invalid key: search song id failed');
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}
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this._songID = parseInt(textEnc.decode(idBuf.subarray(0, idEnd)));
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} else {
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const sizeView = new DataView(last4Byte.buffer, last4Byte.byteOffset);
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const keySize = sizeView.getUint32(0, true);
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