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feat(QMCv2): use js decoder

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(cherry picked from commit c24e5d29733cfa771dd41ae40032029c6bbb9186)
This commit is contained in:
MengYX 2021-12-17 06:24:21 +08:00
parent 1ab05bb509
commit 979168b68f
2 changed files with 10 additions and 13 deletions
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21
src/decrypt/qmc.ts
View File

@ -10,7 +10,7 @@ import {
WriteMetaToMp3 WriteMetaToMp3
} from "@/decrypt/utils"; } from "@/decrypt/utils";
import {parseBlob as metaParseBlob} from "music-metadata-browser"; import {parseBlob as metaParseBlob} from "music-metadata-browser";
import {DecryptQMCv2} from "./qmcv2"; import {DecryptQMCWasm} from "./qmc_wasm";
import iconv from "iconv-lite"; import iconv from "iconv-lite";
@ -55,22 +55,19 @@ 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;
if (version === 2) { if (version === 2 && globalThis.WebAssembly) {
const v2Decrypted = await DecryptQMCv2(fileBuffer); 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 // 如果 v2 检测失败，降级到 v1 再尝试一次
if (v2Decrypted) { if (v2Decrypted) {
musicDecoded = v2Decrypted; musicDecoded = v2Decrypted;
} else {
version = 1;
} }
} }
if (!musicDecoded) {
if (version === 1) { // may throw error
const seed = new QmcStaticCipher(); console.log("qmc: using js decoder")
musicDecoded = new Uint8Array(fileBuffer) const d = new QmcDecoder(new Uint8Array(fileBuffer))
seed.decrypt(musicDecoded, 0); musicDecoded = d.decrypt()
} else if (!musicDecoded) {
throw new Error(`解密失败: ${raw_ext}`);
} }
const ext = SniffAudioExt(musicDecoded, handler.ext); const ext = SniffAudioExt(musicDecoded, handler.ext);

2
src/decrypt/qmcv2.ts → src/decrypt/qmc_wasm.ts
View File

@ -29,7 +29,7 @@ function MergeUint8Array(array: Uint8Array[]): Uint8Array {
* @param {ArrayBuffer} mggBlob 读入的文件 Blob * @param {ArrayBuffer} mggBlob 读入的文件 Blob
* @return {Promise<Uint8Array|false>} * @return {Promise<Uint8Array|false>}
*/ */
export async function DecryptQMCv2(mggBlob: ArrayBuffer) { export async function DecryptQMCWasm(mggBlob: ArrayBuffer) {
// 初始化模组 // 初始化模组
const QMCCrypto = await QMCCryptoModule(); const QMCCrypto = await QMCCryptoModule();