Python 代码转换为 Javascript 运算结果不一致

def cid_hash_file(path):
    h = hashlib.sha1()
    size = os.path.getsize(path)
    with open(path, 'rb') as stream:
        if size < 0xF000:
            h.update(stream.read())
        else:
            h.update(stream.read(0x5000))
            stream.seek(int(size/3))
            h.update(stream.read(0x5000))
            stream.seek(size-0x5000)
            h.update(stream.read(0x5000))
    return h.hexdigest().upper()

上面的代码用 chatGPT 转换后是这样的

function cidHashFile(path) {
  const h = crypto.createHash('sha1');
  const size = fs.statSync(path).size;
  const stream = fs.createReadStream(path);

  if (size < 0xF000) {
    stream.on('data', (chunk) => {
      h.update(chunk);
    });
  } else {
    stream.on('data', (chunk) => {
      if (stream.bytesRead <= 0x5000) {
        h.update(chunk);
      } else if (stream.bytesRead >= Math.floor(size / 3) && stream.bytesRead < Math.floor(size / 3) + 0x5000) {
        h.update(chunk);
      } else if (stream.bytesRead >= size - 0x5000) {
        h.update(chunk);
      }
    });
  }

  stream.on('end', () => {
    const result = h.digest('hex').toUpperCase();
    console.log(result);
  });

  stream.on('error', (err) => {
    console.error('File reading error:', err);
  });
}

试了不同文件计算出来的 hash 不一致，有没有大佬知道原因的？