从nodejs readline中正确查找字节范围

const readline = require('readline');
const fs = require('fs');

const filePath = 'path/to/file.txt';
const startByte = 10; // 起始字节位置
const endByte = 20; // 结束字节位置

const rl = readline.createInterface({
  input: fs.createReadStream(filePath),
  output: process.stdout,
  terminal: false
});

rl.on('line', (line) => {
  const byteLength = Buffer.byteLength(line); // 获取当前行的字节数
  const start = Math.max(0, startByte - byteLength); // 起始字节位置
  const end = Math.min(byteLength, endByte); // 结束字节位置

  const buffer = Buffer.from(line); // 将字符串转换为字节数组
  const slicedBuffer = buffer.slice(start, end); // 截取指定范围的字节

  const result = slicedBuffer.toString(); // 将字节数组转换为字符串
  console.log(result);
});