66 lines
2.2 KiB
TypeScript
66 lines
2.2 KiB
TypeScript
import {Decrypt as RawDecrypt} from "@/decrypt/raw";
|
|
import {DecryptResult} from "@/decrypt/entity";
|
|
import {AudioMimeType, BytesHasPrefix, GetArrayBuffer, GetCoverFromFile, GetMetaFromFile} from "@/decrypt/utils.ts";
|
|
|
|
import {parseBlob as metaParseBlob} from "music-metadata-browser";
|
|
|
|
const MagicHeader = [0x69, 0x66, 0x6D, 0x74]
|
|
const MagicHeader2 = [0xfe, 0xfe, 0xfe, 0xfe]
|
|
const FileTypeMap: { [key: string]: string } = {
|
|
" WAV": ".wav",
|
|
"FLAC": ".flac",
|
|
" MP3": ".mp3",
|
|
" A4M": ".m4a",
|
|
}
|
|
|
|
export async function Decrypt(file: File, raw_filename: string, raw_ext: string): Promise<DecryptResult> {
|
|
const oriData = new Uint8Array(await GetArrayBuffer(file));
|
|
if (!BytesHasPrefix(oriData, MagicHeader) || !BytesHasPrefix(oriData.slice(8, 12), MagicHeader2)) {
|
|
if (raw_ext === "xm") {
|
|
throw Error("此xm文件已损坏")
|
|
} else {
|
|
return await RawDecrypt(file, raw_filename, raw_ext, true)
|
|
}
|
|
}
|
|
|
|
let typeText = (new TextDecoder()).decode(oriData.slice(4, 8))
|
|
if (!FileTypeMap.hasOwnProperty(typeText)) {
|
|
throw Error("未知的.xm文件类型")
|
|
}
|
|
|
|
let key = oriData[0xf]
|
|
let dataOffset = oriData[0xc] | oriData[0xd] << 8 | oriData[0xe] << 16
|
|
let audioData = oriData.slice(0x10);
|
|
let lenAudioData = audioData.length;
|
|
for (let cur = dataOffset; cur < lenAudioData; ++cur)
|
|
audioData[cur] = (audioData[cur] - key) ^ 0xff;
|
|
|
|
const ext = FileTypeMap[typeText];
|
|
const mime = AudioMimeType[ext];
|
|
let musicBlob = new Blob([audioData], {type: mime});
|
|
|
|
const musicMeta = await metaParseBlob(musicBlob);
|
|
if (ext === "wav") {
|
|
//todo:未知的编码方式
|
|
console.info(musicMeta.common)
|
|
musicMeta.common.album = "";
|
|
musicMeta.common.artist = "";
|
|
musicMeta.common.title = "";
|
|
}
|
|
const {title, artist} = GetMetaFromFile(raw_filename,
|
|
musicMeta.common.title, musicMeta.common.artist,
|
|
raw_filename.indexOf("_") === -1 ? "-" : "_")
|
|
|
|
return {
|
|
title,
|
|
artist,
|
|
ext,
|
|
mime,
|
|
album: musicMeta.common.album,
|
|
picture: GetCoverFromFile(musicMeta),
|
|
file: URL.createObjectURL(musicBlob),
|
|
rawExt: "xm"
|
|
}
|
|
}
|
|
|