46 lines
1.5 KiB
JavaScript
46 lines
1.5 KiB
JavaScript
const { inflate } = require('zlib')
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const iconv = require('iconv-lite')
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const { mainHandle, NAMES: { mainWindow: ipcMainWindowNames } } = require('../../common/ipc')
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const handleInflate = data => new Promise((resolve, reject) => {
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inflate(data, (err, result) => {
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if (err) return reject(err)
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resolve(result)
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})
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})
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const buf_key = Buffer.from('yeelion')
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const buf_key_len = buf_key.length
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const decodeLyric = async(buf, isGetLyricx) => {
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// const info = buf.slice(0, index).toString()
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// if (!info.startsWith('tp=content')) return null
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// const isLyric = info.includes('\r\nlrcx=0\r\n')
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if (buf.toString('utf8', 0, 10) != 'tp=content') return ''
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// const index = buf.indexOf('\r\n\r\n') + 4
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const lrcData = await handleInflate(buf.slice(buf.indexOf('\r\n\r\n') + 4))
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if (!isGetLyricx) return iconv.decode(lrcData, 'gb18030')
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const buf_str = Buffer.from(lrcData.toString(), 'base64')
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const buf_str_len = buf_str.length
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const output = new Uint16Array(buf_str_len)
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let i = 0
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while (i < buf_str_len) {
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let j = 0
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while (j < buf_key_len && i < buf_str_len) {
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output[i] = buf_str[i] ^ buf_key[j]
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i++
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j++
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}
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}
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return iconv.decode(Buffer.from(output), 'gb18030')
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}
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mainHandle(ipcMainWindowNames.handle_kw_decode_lyric, async(event, { lrcBase64, isGetLyricx }) => {
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if (!global.modules.mainWindow) throw new Error('mainWindow is undefined')
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const lrc = await decodeLyric(Buffer.from(lrcBase64, 'base64'), isGetLyricx)
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return Buffer.from(lrc).toString('base64')
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})
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