forked from um/web
52 lines
1.7 KiB
TypeScript
52 lines
1.7 KiB
TypeScript
import {
|
|
AudioMimeType,
|
|
GetArrayBuffer,
|
|
GetCoverFromFile,
|
|
GetMetaFromFile,
|
|
SniffAudioExt,
|
|
SplitFilename
|
|
} from "@/decrypt/utils";
|
|
|
|
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, _: string)
|
|
: Promise<DecryptResult> {
|
|
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;
|
|
else buffer[i] = (buffer[i] - 0xc0) * 4 + 3;
|
|
}
|
|
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(audioBlob);
|
|
const {title, artist} = GetMetaFromFile(raw_filename, tag.common.title, tag.common.artist)
|
|
|
|
return {
|
|
title,
|
|
artist,
|
|
ext,
|
|
album: tag.common.album,
|
|
picture: GetCoverFromFile(tag),
|
|
file: URL.createObjectURL(audioBlob),
|
|
blob: audioBlob,
|
|
mime: AudioMimeType[ext]
|
|
}
|
|
}
|