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fix: footer-less qmcv2 file support

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鲁树人 2024-09-26 20:41:02 +01:00
parent 5e890bca77
commit 9fed1ee610
1 changed files with 17 additions and 5 deletions
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22
src/decrypt-worker/decipher/QQMusic.ts
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@ -38,20 +38,32 @@ export class QQMusicV2Decipher implements DecipherInstance {
this.cipherName = `QQMusic/QMC2(user_key=${+useUserKey})`;
}
async decrypt(buffer: Uint8Array, options: DecryptCommandOptions): Promise<DecipherResult | DecipherOK> {
parseFooter(buffer: Uint8Array): { size: number; ekey?: undefined | string } {
const footer = QMCFooter.parse(buffer.subarray(buffer.byteLength - 1024));
if (!footer) {
if (footer) {
const { size, ekey } = footer;
footer.free();
return { size, ekey };
}
// No footer, and we don't accept user key:
if (!this.useUserKey) {
throw new UnsupportedSourceFile('Not QMC2 File');
}
const audioBuffer = buffer.slice(0, buffer.byteLength - footer.size);
return { size: 0 };
}
async decrypt(buffer: Uint8Array, options: DecryptCommandOptions): Promise<DecipherResult | DecipherOK> {
const footer = this.parseFooter(buffer.subarray(buffer.byteLength - 1024));
const ekey = this.useUserKey ? options.qmc2Key : footer.ekey;
footer.free();
if (!ekey) {
throw new Error('EKey missing');
throw new Error('EKey required');
}
const qmc2 = new QMC2(ekey);
const audioBuffer = buffer.slice(0, buffer.byteLength - footer.size);
for (const [block, offset] of chunkBuffer(audioBuffer)) {
qmc2.decrypt(block, offset);
}