2019-09-07 17:50:04 +00:00
|
|
|
const musicMetadata = require("music-metadata-browser");
|
2019-07-05 07:05:11 +00:00
|
|
|
export {Decrypt}
|
|
|
|
const SEED_MAP = [
|
|
|
|
[0x4a, 0xd6, 0xca, 0x90, 0x67, 0xf7, 0x52],
|
|
|
|
[0x5e, 0x95, 0x23, 0x9f, 0x13, 0x11, 0x7e],
|
|
|
|
[0x47, 0x74, 0x3d, 0x90, 0xaa, 0x3f, 0x51],
|
|
|
|
[0xc6, 0x09, 0xd5, 0x9f, 0xfa, 0x66, 0xf9],
|
|
|
|
[0xf3, 0xd6, 0xa1, 0x90, 0xa0, 0xf7, 0xf0],
|
|
|
|
[0x1d, 0x95, 0xde, 0x9f, 0x84, 0x11, 0xf4],
|
|
|
|
[0x0e, 0x74, 0xbb, 0x90, 0xbc, 0x3f, 0x92],
|
|
|
|
[0x00, 0x09, 0x5b, 0x9f, 0x62, 0x66, 0xa1]];
|
|
|
|
const audio_mime_type = {
|
|
|
|
mp3: "audio/mpeg",
|
|
|
|
flac: "audio/flac"
|
|
|
|
};
|
|
|
|
|
|
|
|
async function Decrypt(file) {
|
|
|
|
// 获取扩展名
|
|
|
|
let filename_ext = file.name.substring(file.name.lastIndexOf(".") + 1, file.name.length).toLowerCase();
|
|
|
|
let new_ext;
|
|
|
|
switch (filename_ext) {
|
|
|
|
case "qmc0":
|
|
|
|
case "qmc3":
|
2019-11-09 16:59:13 +00:00
|
|
|
case "qmcogg":
|
2019-07-05 07:05:11 +00:00
|
|
|
new_ext = "mp3";
|
|
|
|
break;
|
|
|
|
case "qmcflac":
|
|
|
|
new_ext = "flac";
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
const mime = audio_mime_type[new_ext];
|
|
|
|
// 读取文件
|
2019-09-08 05:40:32 +00:00
|
|
|
const fileBuffer = await new Promise(resolve => {
|
2019-07-05 07:05:11 +00:00
|
|
|
const reader = new FileReader();
|
|
|
|
reader.onload = (e) => {
|
2019-09-08 05:40:32 +00:00
|
|
|
resolve(e.target.result);
|
2019-07-05 07:05:11 +00:00
|
|
|
};
|
|
|
|
reader.readAsArrayBuffer(file);
|
|
|
|
});
|
|
|
|
const audioData = new Uint8Array(fileBuffer);
|
|
|
|
const audioDataLen = audioData.length;
|
|
|
|
// 转换数据
|
|
|
|
const seed = new Mask();
|
|
|
|
for (let cur = 0; cur < audioDataLen; ++cur) {
|
|
|
|
audioData[cur] ^= seed.NextMask();
|
|
|
|
}
|
|
|
|
// 导出
|
|
|
|
const musicData = new Blob([audioData], {
|
|
|
|
type: mime
|
|
|
|
});
|
|
|
|
const musicUrl = URL.createObjectURL(musicData);
|
|
|
|
// 读取Meta
|
2019-09-08 05:40:32 +00:00
|
|
|
let tag = await musicMetadata.parseBlob(musicData);
|
2019-07-05 07:05:11 +00:00
|
|
|
|
|
|
|
// 处理无标题歌手
|
|
|
|
let filename_array = file.name.substring(0, file.name.lastIndexOf(".")).split("-");
|
2019-09-07 17:50:04 +00:00
|
|
|
let title = tag.common.title;
|
|
|
|
let artist = tag.common.artist;
|
2019-07-05 07:05:11 +00:00
|
|
|
if (filename_array.length > 1) {
|
|
|
|
if (artist === undefined) artist = filename_array[0].trim();
|
|
|
|
if (title === undefined) title = filename_array[1].trim();
|
|
|
|
} else if (filename_array.length === 1) {
|
|
|
|
if (title === undefined) title = filename_array[0].trim();
|
|
|
|
}
|
|
|
|
const filename = artist + " - " + title + "." + new_ext;
|
|
|
|
// 处理无封面
|
|
|
|
let pic_url = "";
|
2019-09-08 06:49:03 +00:00
|
|
|
|
2019-09-08 06:28:25 +00:00
|
|
|
if (tag.common.picture !== undefined && tag.common.picture.length >= 1) {
|
|
|
|
const picture = tag.common.picture[0];
|
|
|
|
const blobPic = new Blob([picture.data], {type: picture.format});
|
|
|
|
pic_url = URL.createObjectURL(blobPic);
|
2019-07-05 07:05:11 +00:00
|
|
|
}
|
|
|
|
// 返回
|
|
|
|
return {
|
|
|
|
filename: filename,
|
|
|
|
title: title,
|
|
|
|
artist: artist,
|
2019-09-08 05:40:32 +00:00
|
|
|
album: tag.common.album,
|
2019-07-05 07:05:11 +00:00
|
|
|
picture: pic_url,
|
2019-09-14 12:43:57 +00:00
|
|
|
file: musicUrl,
|
2019-07-05 07:05:11 +00:00
|
|
|
mime: mime
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
class Mask {
|
|
|
|
constructor() {
|
|
|
|
this.x = -1;
|
|
|
|
this.y = 8;
|
|
|
|
this.dx = 1;
|
|
|
|
this.index = -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
NextMask() {
|
|
|
|
let ret;
|
|
|
|
this.index++;
|
|
|
|
if (this.x < 0) {
|
|
|
|
this.dx = 1;
|
|
|
|
this.y = (8 - this.y) % 8;
|
|
|
|
ret = 0xc3
|
|
|
|
} else if (this.x > 6) {
|
|
|
|
this.dx = -1;
|
|
|
|
this.y = 7 - this.y;
|
|
|
|
ret = 0xd8
|
|
|
|
} else {
|
|
|
|
ret = SEED_MAP[this.y][this.x]
|
|
|
|
}
|
|
|
|
this.x += this.dx;
|
|
|
|
if (this.index === 0x8000 || (this.index > 0x8000 && (this.index + 1) % 0x8000 === 0)) {
|
|
|
|
return this.NextMask()
|
|
|
|
}
|
|
|
|
return ret
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|