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Use Universal Mask for Qmc,Mgg,Mflac

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Add Local Experimental Support For Mgg
This commit is contained in:
MengYX
2020-02-11 00:34:26 +08:00
parent 2fc9368a92
commit 47cea6eae9
5 changed files with 252 additions and 190 deletions
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53
src/decrypt/qmc.js
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@ -1,15 +1,6 @@
const musicMetadata = require("music-metadata-browser");
const util = require("./util");
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]];
import * as mask from "./qmcmask"
const OriginalExtMap = {
"qmc0": "mp3",
@ -21,7 +12,8 @@ const OriginalExtMap = {
"tkm": "m4a"
};
async function Decrypt(file, raw_filename, raw_ext) {
//todo: use header to detect media type
export async function Decrypt(file, raw_filename, raw_ext) {
// 获取扩展名
if (!(raw_ext in OriginalExtMap)) {
return {status: false, message: "File type is incorrect!"}
@ -32,12 +24,10 @@ async function Decrypt(file, raw_filename, raw_ext) {
const fileBuffer = await util.GetArrayBuffer(file);
const audioData = new Uint8Array(fileBuffer);
// 转换数据
const seed = new Mask();
for (let cur = 0; cur < audioData.length; ++cur) {
audioData[cur] ^= seed.NextMask();
}
const seed = mask.QmcMaskGetDefault();
const dec = seed.Decrypt(audioData);
// 导出
const musicData = new Blob([audioData], {type: mime});
const musicData = new Blob([dec], {type: mime});
// 读取Meta
const tag = await musicMetadata.parseBlob(musicData);
const info = util.GetFileInfo(tag.common.artist, tag.common.title, raw_filename);
@ -54,34 +44,3 @@ async function Decrypt(file, raw_filename, raw_ext) {
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
}
}