readAt method

@override Future<Uint8List> readAt(int offset, int count)

Read count bytes starting at offset.

Implementation

@override
Future<Uint8List> readAt(int offset, int count) async {
  // A fresh handle per read, on purpose: DataSource has no dispose hook
  // to close a long-lived handle, and reads can run concurrently across
  // lanes — one shared RandomAccessFile would race on its position or
  // leak. The OS page cache keeps the repeat opens cheap.
  final raf = await _file.open();
  try {
    await raf.setPosition(offset);
    return await raf.read(count);
  } finally {
    await raf.close();
  }
}