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