feature: use online info to correct qmc meta
(cherry picked from commit 7c62f35adb268509f543d67b4a36f49ada3ae206)
This commit is contained in:
parent
9edb12b008
commit
2e0b24a6fc
@ -1,6 +1,5 @@
|
|||||||
import { QmcMapCipher, QmcRC4Cipher, QmcStaticCipher, QmcStreamCipher } from './qmc_cipher';
|
import { QmcMapCipher, QmcRC4Cipher, QmcStaticCipher, QmcStreamCipher } from './qmc_cipher';
|
||||||
import { AudioMimeType, GetArrayBuffer, SniffAudioExt } from '@/decrypt/utils';
|
import { AudioMimeType, GetArrayBuffer, SniffAudioExt } from '@/decrypt/utils';
|
||||||
import { DecryptQMCWasm } from './qmc_wasm';
|
|
||||||
|
|
||||||
import { DecryptResult } from '@/decrypt/entity';
|
import { DecryptResult } from '@/decrypt/entity';
|
||||||
import { QmcDeriveKey } from '@/decrypt/qmc_key';
|
import { QmcDeriveKey } from '@/decrypt/qmc_key';
|
||||||
@ -42,20 +41,24 @@ export async function Decrypt(file: Blob, raw_filename: string, raw_ext: string)
|
|||||||
|
|
||||||
const fileBuffer = await GetArrayBuffer(file);
|
const fileBuffer = await GetArrayBuffer(file);
|
||||||
let musicDecoded: Uint8Array | undefined;
|
let musicDecoded: Uint8Array | undefined;
|
||||||
|
let musicID: number | undefined;
|
||||||
|
|
||||||
|
// todo: wasm decoder doesn't support extract the song id for .mgg1/.mflac0 currently
|
||||||
|
// if (version === 2 && globalThis.WebAssembly) {
|
||||||
|
// console.log('qmc: using wasm decoder');
|
||||||
|
// const v2Decrypted = await DecryptQMCWasm(fileBuffer);
|
||||||
|
// // 如果 v2 检测失败,降级到 v1 再尝试一次
|
||||||
|
// if (v2Decrypted) {
|
||||||
|
// musicDecoded = v2Decrypted;
|
||||||
|
// }
|
||||||
|
// }
|
||||||
|
|
||||||
if (version === 2 && globalThis.WebAssembly) {
|
|
||||||
console.log('qmc: using wasm decoder');
|
|
||||||
const v2Decrypted = await DecryptQMCWasm(fileBuffer);
|
|
||||||
// 如果 v2 检测失败,降级到 v1 再尝试一次
|
|
||||||
if (v2Decrypted) {
|
|
||||||
musicDecoded = v2Decrypted;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
if (!musicDecoded) {
|
if (!musicDecoded) {
|
||||||
// may throw error
|
// may throw error
|
||||||
console.log('qmc: using js decoder');
|
console.log('qmc: using js decoder');
|
||||||
const d = new QmcDecoder(new Uint8Array(fileBuffer));
|
const d = new QmcDecoder(new Uint8Array(fileBuffer));
|
||||||
musicDecoded = d.decrypt();
|
musicDecoded = d.decrypt();
|
||||||
|
musicID = d.songID;
|
||||||
}
|
}
|
||||||
|
|
||||||
const ext = SniffAudioExt(musicDecoded, handler.ext);
|
const ext = SniffAudioExt(musicDecoded, handler.ext);
|
||||||
@ -65,6 +68,7 @@ export async function Decrypt(file: Blob, raw_filename: string, raw_ext: string)
|
|||||||
new Blob([musicDecoded], { type: mime }),
|
new Blob([musicDecoded], { type: mime }),
|
||||||
raw_filename,
|
raw_filename,
|
||||||
ext,
|
ext,
|
||||||
|
musicID,
|
||||||
);
|
);
|
||||||
|
|
||||||
return {
|
return {
|
||||||
@ -81,19 +85,25 @@ export async function Decrypt(file: Blob, raw_filename: string, raw_ext: string)
|
|||||||
|
|
||||||
export class QmcDecoder {
|
export class QmcDecoder {
|
||||||
private static readonly BYTE_COMMA = ','.charCodeAt(0);
|
private static readonly BYTE_COMMA = ','.charCodeAt(0);
|
||||||
file: Uint8Array;
|
private readonly file: Uint8Array;
|
||||||
size: number;
|
private readonly size: number;
|
||||||
decoded: boolean = false;
|
private decoded: boolean = false;
|
||||||
audioSize?: number;
|
private audioSize?: number;
|
||||||
cipher?: QmcStreamCipher;
|
private cipher?: QmcStreamCipher;
|
||||||
|
|
||||||
constructor(file: Uint8Array) {
|
public constructor(file: Uint8Array) {
|
||||||
this.file = file;
|
this.file = file;
|
||||||
this.size = file.length;
|
this.size = file.length;
|
||||||
this.searchKey();
|
this.searchKey();
|
||||||
}
|
}
|
||||||
|
|
||||||
decrypt(): Uint8Array {
|
private _songID?: number;
|
||||||
|
|
||||||
|
public get songID() {
|
||||||
|
return this._songID;
|
||||||
|
}
|
||||||
|
|
||||||
|
public decrypt(): Uint8Array {
|
||||||
if (!this.cipher) {
|
if (!this.cipher) {
|
||||||
throw new Error('no cipher found');
|
throw new Error('no cipher found');
|
||||||
}
|
}
|
||||||
@ -118,9 +128,20 @@ export class QmcDecoder {
|
|||||||
const sizeView = new DataView(sizeBuf.buffer, sizeBuf.byteOffset);
|
const sizeView = new DataView(sizeBuf.buffer, sizeBuf.byteOffset);
|
||||||
const keySize = sizeView.getUint32(0, false);
|
const keySize = sizeView.getUint32(0, false);
|
||||||
this.audioSize = this.size - keySize - 8;
|
this.audioSize = this.size - keySize - 8;
|
||||||
|
|
||||||
const rawKey = this.file.subarray(this.audioSize, this.size - 8);
|
const rawKey = this.file.subarray(this.audioSize, this.size - 8);
|
||||||
const keyEnd = rawKey.findIndex((v) => v == QmcDecoder.BYTE_COMMA);
|
const keyEnd = rawKey.findIndex((v) => v == QmcDecoder.BYTE_COMMA);
|
||||||
|
if (keyEnd < 0) {
|
||||||
|
throw new Error('invalid key: search raw key failed');
|
||||||
|
}
|
||||||
this.setCipher(rawKey.subarray(0, keyEnd));
|
this.setCipher(rawKey.subarray(0, keyEnd));
|
||||||
|
|
||||||
|
const idBuf = rawKey.subarray(keyEnd + 1);
|
||||||
|
const idEnd = idBuf.findIndex((v) => v == QmcDecoder.BYTE_COMMA);
|
||||||
|
if (keyEnd < 0) {
|
||||||
|
throw new Error('invalid key: search song id failed');
|
||||||
|
}
|
||||||
|
this._songID = parseInt(textEnc.decode(idBuf.subarray(0, idEnd)));
|
||||||
} else {
|
} else {
|
||||||
const sizeView = new DataView(last4Byte.buffer, last4Byte.byteOffset);
|
const sizeView = new DataView(last4Byte.buffer, last4Byte.byteOffset);
|
||||||
const keySize = sizeView.getUint32(0, true);
|
const keySize = sizeView.getUint32(0, true);
|
||||||
|
Loading…
Reference in New Issue
Block a user