Function readFileHead

packages/parser/src/sniffer.ts:16–22

* 读取文件头部内容

(filePath: string, size: number = HEAD_SIZE)

 * 读取文件头部内容
 */
function readFileHead(filePath: string, size: number = HEAD_SIZE): string {
  const fd = fs.openSync(filePath, 'r')
  const buffer = Buffer.alloc(size)
  const bytesRead = fs.readSync(fd, buffer, 0, size, 0)
  fs.closeSync(fd)
  return buffer.slice(0, bytesRead).toString('utf-8')
}

/**
 * 获取文件扩展名（小写）