68 lines
2.2 KiB
TypeScript
68 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';
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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) 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(
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raw_filename,
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musicMeta.common.title,
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String(musicMeta.common.artists || musicMeta.common.artist || ""),
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raw_filename.indexOf('_') === -1 ? '-' : '_',
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);
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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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