Merge pull request '优化 QMCCache 解密过程' (#6) from jixunmoe/um-web:refactor/optimise-qm-cache-decode into master

Reviewed-on: https://git.unlock-music.dev/um/web/pulls/6
This commit is contained in:
um-dev 2022-11-21 19:48:05 +00:00
commit 2872ceb3bb
3 changed files with 72 additions and 50 deletions

View File

@ -0,0 +1,20 @@
import { DecryptBuffer as DecryptQmcCacheBuffer } from '../qmccache';
import fs from 'fs';
const expectedBuffer = fs.readFileSync(__dirname + '/fixture/qmc_cache_expected.bin');
const createInputBuffer = () => {
const buffer = Buffer.alloc(256);
for (let i = buffer.byteLength; i >= 0; i--) {
buffer[i] = i;
}
return buffer;
};
describe('decrypt/qmccache', () => {
it('should decrypt specified buffer correctly', () => {
const input = createInputBuffer();
DecryptQmcCacheBuffer(input);
expect(input).toEqual(expectedBuffer);
});
});

Binary file not shown.

View File

@ -1,50 +1,52 @@
import { import {
AudioMimeType, AudioMimeType,
GetArrayBuffer, GetArrayBuffer,
GetCoverFromFile, GetCoverFromFile,
GetMetaFromFile, GetMetaFromFile,
SniffAudioExt, SniffAudioExt,
SplitFilename, SplitFilename,
} from '@/decrypt/utils'; } from '@/decrypt/utils';
import { Decrypt as QmcDecrypt, HandlerMap } from '@/decrypt/qmc'; import { Decrypt as QmcDecrypt, HandlerMap } from '@/decrypt/qmc';
import { DecryptResult } from '@/decrypt/entity'; import { DecryptResult } from '@/decrypt/entity';
import { parseBlob as metaParseBlob } from 'music-metadata-browser'; import { parseBlob as metaParseBlob } from 'music-metadata-browser';
export async function Decrypt(file: Blob, raw_filename: string, _: string): Promise<DecryptResult> { export function DecryptBuffer(buffer: Uint8Array | Buffer) {
const buffer = new Uint8Array(await GetArrayBuffer(file)); let length = buffer.byteLength;
let length = buffer.length; for (let i = 0; i < length; i++) {
for (let i = 0; i < length; i++) { let byte = buffer[i] ^ 0xf4; // xor 0xf4
buffer[i] ^= 0xf4; byte = ((byte & 0b0011_1111) << 2) | (byte >> 6); // rol 2
if (buffer[i] <= 0x3f) buffer[i] = buffer[i] * 4; buffer[i] = byte;
else if (buffer[i] <= 0x7f) buffer[i] = (buffer[i] - 0x40) * 4 + 1; }
else if (buffer[i] <= 0xbf) buffer[i] = (buffer[i] - 0x80) * 4 + 2; }
else buffer[i] = (buffer[i] - 0xc0) * 4 + 3;
} export async function Decrypt(file: Blob, raw_filename: string, _: string): Promise<DecryptResult> {
let ext = SniffAudioExt(buffer, ''); const buffer = new Uint8Array(await GetArrayBuffer(file));
const newName = SplitFilename(raw_filename); DecryptBuffer(buffer);
let audioBlob: Blob; let ext = SniffAudioExt(buffer, '');
if (ext !== '' || newName.ext === 'mp3') { const newName = SplitFilename(raw_filename);
audioBlob = new Blob([buffer], { type: AudioMimeType[ext] }); let audioBlob: Blob;
} else if (newName.ext in HandlerMap) { if (ext !== '' || newName.ext === 'mp3') {
audioBlob = new Blob([buffer], { type: 'application/octet-stream' }); audioBlob = new Blob([buffer], { type: AudioMimeType[ext] });
return QmcDecrypt(audioBlob, newName.name, newName.ext); } else if (newName.ext in HandlerMap) {
} else { audioBlob = new Blob([buffer], { type: 'application/octet-stream' });
throw '不支持的QQ音乐缓存格式'; return QmcDecrypt(audioBlob, newName.name, newName.ext);
} } else {
const tag = await metaParseBlob(audioBlob); throw '不支持的QQ音乐缓存格式';
const { title, artist } = GetMetaFromFile(raw_filename, tag.common.title, tag.common.artist); }
const tag = await metaParseBlob(audioBlob);
return { const { title, artist } = GetMetaFromFile(raw_filename, tag.common.title, tag.common.artist);
title,
artist, return {
ext, title,
album: tag.common.album, artist,
picture: GetCoverFromFile(tag), ext,
file: URL.createObjectURL(audioBlob), album: tag.common.album,
blob: audioBlob, picture: GetCoverFromFile(tag),
mime: AudioMimeType[ext], file: URL.createObjectURL(audioBlob),
}; blob: audioBlob,
} mime: AudioMimeType[ext],
};
}