Jixun Wu
2 years ago
3 changed files with 74 additions and 50 deletions
@ -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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@ -1,50 +1,54 @@ |
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import { |
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AudioMimeType, |
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GetArrayBuffer, |
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GetCoverFromFile, |
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GetMetaFromFile, |
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SniffAudioExt, |
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SplitFilename, |
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} from '@/decrypt/utils'; |
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import { Decrypt as QmcDecrypt, HandlerMap } from '@/decrypt/qmc'; |
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import { DecryptResult } from '@/decrypt/entity'; |
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import { parseBlob as metaParseBlob } from 'music-metadata-browser'; |
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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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let ext = SniffAudioExt(buffer, ''); |
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const newName = SplitFilename(raw_filename); |
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let audioBlob: Blob; |
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if (ext !== '' || newName.ext === 'mp3') { |
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audioBlob = new Blob([buffer], { type: AudioMimeType[ext] }); |
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} else if (newName.ext in HandlerMap) { |
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audioBlob = new Blob([buffer], { type: 'application/octet-stream' }); |
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return QmcDecrypt(audioBlob, newName.name, newName.ext); |
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} else { |
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throw '不支持的QQ音乐缓存格式'; |
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} |
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const tag = await metaParseBlob(audioBlob); |
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const { title, artist } = GetMetaFromFile(raw_filename, tag.common.title, tag.common.artist); |
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return { |
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title, |
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artist, |
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ext, |
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album: tag.common.album, |
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picture: GetCoverFromFile(tag), |
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file: URL.createObjectURL(audioBlob), |
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blob: audioBlob, |
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mime: AudioMimeType[ext], |
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}; |
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} |
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import { |
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AudioMimeType, |
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GetArrayBuffer, |
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GetCoverFromFile, |
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GetMetaFromFile, |
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SniffAudioExt, |
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SplitFilename, |
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} from '@/decrypt/utils'; |
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import { Decrypt as QmcDecrypt, HandlerMap } from '@/decrypt/qmc'; |
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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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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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} |
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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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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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if (ext !== '' || newName.ext === 'mp3') { |
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audioBlob = new Blob([buffer], { type: AudioMimeType[ext] }); |
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} else if (newName.ext in HandlerMap) { |
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audioBlob = new Blob([buffer], { type: 'application/octet-stream' }); |
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return QmcDecrypt(audioBlob, newName.name, newName.ext); |
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} else { |
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throw '不支持的QQ音乐缓存格式'; |
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} |
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const tag = await metaParseBlob(audioBlob); |
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const { title, artist } = GetMetaFromFile(raw_filename, tag.common.title, tag.common.artist); |
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return { |
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title, |
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artist, |
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ext, |
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album: tag.common.album, |
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picture: GetCoverFromFile(tag), |
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file: URL.createObjectURL(audioBlob), |
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blob: audioBlob, |
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mime: AudioMimeType[ext], |
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}; |
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} |
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