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refactor: restore support for QMCv1.

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(cherry picked from commit 19239f182d71e2e4362309f08706a91c00bb6bd1)
This commit is contained in:
鲁树人
2021-12-15 19:59:06 +00:00
parent dbb5472f96
commit 733c1721ed
2 changed files with 94 additions and 96 deletions
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75
src/decrypt/qmc.ts
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@@ -1,4 +1,4 @@
import {QmcMask, QmcMaskDetectMflac, QmcMaskDetectMgg, QmcMaskGetDefault} from "./qmcMask";
import {QmcMask, QmcMaskGetDefault} from "./qmcMask";
import {toByteArray as Base64Decode} from 'base64-js'
import {
AudioMimeType,
@@ -9,7 +9,7 @@ import {
SniffAudioExt, WriteMetaToFlac, WriteMetaToMp3
} from "@/decrypt/utils";
import {parseBlob as metaParseBlob} from "music-metadata-browser";
import {decryptMGG} from "./qmcv2";
import {DecryptQMCv2} from "./qmcv2";
import iconv from "iconv-lite";
@@ -18,60 +18,49 @@ import {queryAlbumCover, queryKeyInfo, reportKeyUsage} from "@/utils/api";
interface Handler {
ext: string
detect: boolean
handler(data?: Uint8Array): QmcMask | undefined
version: number
}
export const HandlerMap: { [key: string]: Handler } = {
"mgg": {handler: QmcMaskDetectMgg, ext: "ogg", detect: true},
"mflac": {handler: QmcMaskDetectMflac, ext: "flac", detect: true},
"mgg.cache": {handler: QmcMaskDetectMgg, ext: "ogg", detect: false},
"mflac.cache": {handler: QmcMaskDetectMflac, ext: "flac", detect: false},
"qmc0": {handler: QmcMaskGetDefault, ext: "mp3", detect: false},
"qmc2": {handler: QmcMaskGetDefault, ext: "ogg", detect: false},
"qmc3": {handler: QmcMaskGetDefault, ext: "mp3", detect: false},
"qmcogg": {handler: QmcMaskGetDefault, ext: "ogg", detect: false},
"qmcflac": {handler: QmcMaskGetDefault, ext: "flac", detect: false},
"bkcmp3": {handler: QmcMaskGetDefault, ext: "mp3", detect: false},
"bkcflac": {handler: QmcMaskGetDefault, ext: "flac", detect: false},
"tkm": {handler: QmcMaskGetDefault, ext: "m4a", detect: false},
"666c6163": {handler: QmcMaskGetDefault, ext: "flac", detect: false},
"6d7033": {handler: QmcMaskGetDefault, ext: "mp3", detect: false},
"6f6767": {handler: QmcMaskGetDefault, ext: "ogg", detect: false},
"6d3461": {handler: QmcMaskGetDefault, ext: "m4a", detect: false},
"776176": {handler: QmcMaskGetDefault, ext: "wav", detect: false}
"mgg": {ext: "ogg", version: 2},
"mgg1": {ext: "ogg", version: 2},
"mflac": {ext: "flac", version: 2},
"mflac0": {ext: "flac", version: 2},
"qmc0": {ext: "mp3", version: 1},
"qmc2": {ext: "ogg", version: 1},
"qmc3": {ext: "mp3", version: 1},
"qmcogg": {ext: "ogg", version: 1},
"qmcflac": {ext: "flac", version: 1},
"bkcmp3": {ext: "mp3", version: 1},
"bkcflac": {ext: "flac", version: 1},
"tkm": {ext: "m4a", version: 1},
"666c6163": {ext: "flac", version: 1},
"6d7033": {ext: "mp3", version: 1},
"6f6767": {ext: "ogg", version: 1},
"6d3461": {ext: "m4a", version: 1},
"776176": {ext: "wav", version: 1}
};
function mergeUint8(array: Uint8Array[]): Uint8Array {
// Get the total length of all arrays.
let length = 0;
array.forEach(item => {
length += item.length;
});
// Create a new array with total length and merge all source arrays.
let mergedArray = new Uint8Array(length);
let offset = 0;
array.forEach(item => {
mergedArray.set(item, offset);
offset += item.length;
});
return mergedArray;
}
export async function Decrypt(file: Blob, raw_filename: string, raw_ext: string): Promise<DecryptResult> {
if (!(raw_ext in HandlerMap)) throw `Qmc cannot handle type: ${raw_ext}`;
const handler = HandlerMap[raw_ext];
const decodedParts = await decryptMGG(await file.arrayBuffer());
let musicDecoded = mergeUint8(decodedParts);
const fileBuffer = await GetArrayBuffer(file);
let musicDecoded: Uint8Array;
if (handler.version === 1) {
const seed = QmcMaskGetDefault();
musicDecoded = seed.Decrypt(new Uint8Array(fileBuffer));
} else if (handler.version === 2) {
musicDecoded = await DecryptQMCv2(fileBuffer);
} else {
throw new Error(`不支持的加密版本: ${handler.version} (${raw_ext})`);
}
const ext = SniffAudioExt(musicDecoded, handler.ext);
const mime = AudioMimeType[ext];
let musicBlob = new Blob(decodedParts, {type: mime});
let musicBlob = new Blob([musicDecoded], {type: mime});
const musicMeta = await metaParseBlob(musicBlob);
for (let metaIdx in musicMeta.native) {