fix: decrypt/qmc-cache

adapt: decrypt/qmc for qmc-cache
This commit is contained in:
Emmm Monster 2021-06-03 12:47:06 +08:00
parent 02a146e069
commit f0875ad175
No known key found for this signature in database
GPG Key ID: C98279C83FB50DB9
3 changed files with 43 additions and 28 deletions

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@ -22,7 +22,7 @@ interface Handler {
handler(data?: Uint8Array): QmcMask | undefined
}
const HandlerMap: { [key: string]: Handler } = {
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},
@ -42,8 +42,8 @@ const HandlerMap: { [key: string]: Handler } = {
"776176": {handler: QmcMaskGetDefault, ext: "wav", detect: false}
};
export async function Decrypt(file: File, raw_filename: string, raw_ext: string): Promise<DecryptResult> {
if (!(raw_ext in HandlerMap)) throw "File type is incorrect!";
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 fileData = new Uint8Array(await GetArrayBuffer(file));

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@ -1,34 +1,41 @@
import {AudioMimeType, GetArrayBuffer, GetCoverFromFile, GetMetaFromFile, SniffAudioExt} from "@/decrypt/utils.ts";
import {
AudioMimeType,
GetArrayBuffer,
GetCoverFromFile,
GetMetaFromFile,
SniffAudioExt,
SplitFilename
} from "@/decrypt/utils.ts";
import {Decrypt as QmcDecrypt} from "@/decrypt/qmc";
import {Decrypt as QmcDecrypt, HandlerMap} from "@/decrypt/qmc";
import {DecryptResult} from "@/decrypt/entity";
import {parseBlob as metaParseBlob} from "music-metadata-browser";
export async function Decrypt(file: Blob, raw_filename: string, raw_ext: string, detect: boolean = true)
export async function Decrypt(file: Blob, raw_filename: string, _: string)
: Promise<DecryptResult> {
let ext = raw_ext;
if (detect) {
const buffer = new Uint8Array(await GetArrayBuffer(file));
let length = buffer.length
for (let i = 0; i < length; i++) {
buffer[i] ^= 0xf4
if(buffer[i] <= 0x3f)buffer[i] = buffer[i] * 4;
else if(buffer[i] <= 0x7f)buffer[i] = (buffer[i] - 0x40) * 4 + 1;
else if(buffer[i] <= 0xbf)buffer[i] = (buffer[i] - 0x80) * 4 + 2;
if (buffer[i] <= 0x3f) buffer[i] = buffer[i] * 4;
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;
}
ext = SniffAudioExt(buffer, raw_ext);
if (ext !== raw_ext) file = new Blob([buffer], {type: AudioMimeType[ext]})
else {
file = new Blob([buffer], {type: "application/octet-stream"})
let ext = raw_filename.substring(file.name.lastIndexOf(".") + 1, file.name.length).toLowerCase();
if (ext !== "mgg" && ext !== "mflac") throw "不支持的QQ音乐缓存格式" + raw_filename + ".cache";
return QmcDecrypt(file, raw_filename, ext+".cache");
let ext = SniffAudioExt(buffer, "");
const newName = SplitFilename(raw_filename)
let audioBlob: Blob
if (ext !== "" || newName.ext === "mp3") {
audioBlob = new Blob([buffer], {type: AudioMimeType[ext]})
} else if (newName.ext in HandlerMap) {
audioBlob = new Blob([buffer], {type: "application/octet-stream"})
return QmcDecrypt(audioBlob, newName.name, newName.ext);
} else {
throw "不支持的QQ音乐缓存格式"
}
}
const tag = await metaParseBlob(file);
const tag = await metaParseBlob(audioBlob);
const {title, artist} = GetMetaFromFile(raw_filename, tag.common.title, tag.common.artist)
return {
@ -37,8 +44,8 @@ export async function Decrypt(file: Blob, raw_filename: string, raw_ext: string,
ext,
album: tag.common.album,
picture: GetCoverFromFile(tag),
file: URL.createObjectURL(file),
blob: file,
file: URL.createObjectURL(audioBlob),
blob: audioBlob,
mime: AudioMimeType[ext]
}
}

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@ -160,3 +160,11 @@ export function WriteMetaToFlac(audioData: Buffer, info: IMusicMeta, original: I
}
return writer.save()
}
export function SplitFilename(n: string): { name: string; ext: string } {
const pos = n.lastIndexOf(".")
return {
ext: n.substring(pos + 1).toLowerCase(),
name: n.substring(0, pos)
}
}