Merge pull request '优化 QMCCache 解密过程' (#6) from jixunmoe/um-web:refactor/optimise-qm-cache-decode into master
Reviewed-on: #6
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commit
2872ceb3bb
20
src/decrypt/__test__/QmcCache.test.ts
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20
src/decrypt/__test__/QmcCache.test.ts
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@ -0,0 +1,20 @@
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import { DecryptBuffer as DecryptQmcCacheBuffer } from '../qmccache';
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import fs from 'fs';
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const expectedBuffer = fs.readFileSync(__dirname + '/fixture/qmc_cache_expected.bin');
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const createInputBuffer = () => {
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const buffer = Buffer.alloc(256);
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for (let i = buffer.byteLength; i >= 0; i--) {
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buffer[i] = i;
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}
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return buffer;
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};
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describe('decrypt/qmccache', () => {
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it('should decrypt specified buffer correctly', () => {
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const input = createInputBuffer();
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DecryptQmcCacheBuffer(input);
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expect(input).toEqual(expectedBuffer);
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});
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});
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BIN
src/decrypt/__test__/fixture/qmc_cache_expected.bin
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BIN
src/decrypt/__test__/fixture/qmc_cache_expected.bin
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@ -13,16 +13,18 @@ import { DecryptResult } from '@/decrypt/entity';
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import { parseBlob as metaParseBlob } from 'music-metadata-browser';
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export function DecryptBuffer(buffer: Uint8Array | Buffer) {
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let length = buffer.byteLength;
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for (let i = 0; i < length; i++) {
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let byte = buffer[i] ^ 0xf4; // xor 0xf4
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byte = ((byte & 0b0011_1111) << 2) | (byte >> 6); // rol 2
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buffer[i] = byte;
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}
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}
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export async function Decrypt(file: Blob, raw_filename: string, _: string): Promise<DecryptResult> {
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const buffer = new Uint8Array(await GetArrayBuffer(file));
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let length = buffer.length;
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for (let i = 0; i < length; i++) {
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buffer[i] ^= 0xf4;
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if (buffer[i] <= 0x3f) buffer[i] = buffer[i] * 4;
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else if (buffer[i] <= 0x7f) buffer[i] = (buffer[i] - 0x40) * 4 + 1;
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else if (buffer[i] <= 0xbf) buffer[i] = (buffer[i] - 0x80) * 4 + 2;
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else buffer[i] = (buffer[i] - 0xc0) * 4 + 3;
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}
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DecryptBuffer(buffer);
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let ext = SniffAudioExt(buffer, '');
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const newName = SplitFilename(raw_filename);
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let audioBlob: Blob;
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