126 lines
3.5 KiB
JavaScript
126 lines
3.5 KiB
JavaScript
const jsmediatags = require("jsmediatags");
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export {Decrypt}
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const SEED_MAP = [
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[0x4a, 0xd6, 0xca, 0x90, 0x67, 0xf7, 0x52],
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[0x5e, 0x95, 0x23, 0x9f, 0x13, 0x11, 0x7e],
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[0x47, 0x74, 0x3d, 0x90, 0xaa, 0x3f, 0x51],
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[0xc6, 0x09, 0xd5, 0x9f, 0xfa, 0x66, 0xf9],
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[0xf3, 0xd6, 0xa1, 0x90, 0xa0, 0xf7, 0xf0],
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[0x1d, 0x95, 0xde, 0x9f, 0x84, 0x11, 0xf4],
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[0x0e, 0x74, 0xbb, 0x90, 0xbc, 0x3f, 0x92],
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[0x00, 0x09, 0x5b, 0x9f, 0x62, 0x66, 0xa1]];
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const audio_mime_type = {
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mp3: "audio/mpeg",
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flac: "audio/flac"
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};
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async function Decrypt(file) {
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// 获取扩展名
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let filename_ext = file.name.substring(file.name.lastIndexOf(".") + 1, file.name.length).toLowerCase();
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let new_ext;
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switch (filename_ext) {
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case "qmc0":
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case "qmc3":
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new_ext = "mp3";
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break;
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case "qmcflac":
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new_ext = "flac";
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break;
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default:
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return;
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}
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const mime = audio_mime_type[new_ext];
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// 读取文件
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const fileBuffer = await new Promise(reslove => {
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const reader = new FileReader();
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reader.onload = (e) => {
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reslove(e.target.result);
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};
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reader.readAsArrayBuffer(file);
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});
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const audioData = new Uint8Array(fileBuffer);
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const audioDataLen = audioData.length;
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// 转换数据
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const seed = new Mask();
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for (let cur = 0; cur < audioDataLen; ++cur) {
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audioData[cur] ^= seed.NextMask();
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}
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// 导出
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const musicData = new Blob([audioData], {
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type: mime
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});
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const musicUrl = URL.createObjectURL(musicData);
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// 读取Meta
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let tag = await new Promise(resolve => {
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new jsmediatags.Reader(musicData).read({
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onSuccess: resolve,
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onError: (err) => {
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console.log(err);
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resolve({tags: {}})
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}
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});
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});
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// 处理无标题歌手
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let filename_array = file.name.substring(0, file.name.lastIndexOf(".")).split("-");
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let title = tag.tags.title;
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let artist = tag.tags.artist;
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if (filename_array.length > 1) {
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if (artist === undefined) artist = filename_array[0].trim();
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if (title === undefined) title = filename_array[1].trim();
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} else if (filename_array.length === 1) {
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if (title === undefined) title = filename_array[0].trim();
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}
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const filename = artist + " - " + title + "." + new_ext;
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// 处理无封面
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let pic_url = "";
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if (tag.tags.picture !== undefined) {
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let pic = new Blob([new Uint8Array(tag.tags.picture.data)], {type: tag.tags.picture.format});
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pic_url = URL.createObjectURL(pic);
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}
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// 返回
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return {
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filename: filename,
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title: title,
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artist: artist,
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album: tag.tags.album,
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file: musicUrl,
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picture: pic_url,
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mime: mime
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}
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}
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class Mask {
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constructor() {
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this.x = -1;
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this.y = 8;
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this.dx = 1;
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this.index = -1;
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}
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NextMask() {
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let ret;
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this.index++;
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if (this.x < 0) {
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this.dx = 1;
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this.y = (8 - this.y) % 8;
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ret = 0xc3
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} else if (this.x > 6) {
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this.dx = -1;
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this.y = 7 - this.y;
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ret = 0xd8
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} else {
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ret = SEED_MAP[this.y][this.x]
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}
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this.x += this.dx;
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if (this.index === 0x8000 || (this.index > 0x8000 && (this.index + 1) % 0x8000 === 0)) {
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return this.NextMask()
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}
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return ret
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}
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}
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