read method

@override Future<Uint8List> read(ByteRange range)

Reads exactly the bytes covered by range.

Implementation

@override
Future<Uint8List> read(ByteRange range) => _synchronized(() async {
  final available = ByteRange(0, _snapshotLength);
  if (!available.containsRange(range)) {
    throw ByteRangeOutOfBoundsException(range, available);
  }

  await _verifyLength();
  try {
    await _handle.setPosition(range.start);
    final bytes = await _handle.read(range.length);
    if (bytes.length != range.length) {
      throw TruncatedReadException(
        range: range,
        expectedLength: range.length,
        actualLength: bytes.length,
      );
    }
    await _verifyLength();
    return Uint8List.fromList(bytes);
  } on ByteIoException {
    rethrow;
  } on FileSystemException catch (error) {
    throw ByteSourceIoException(
      operation: 'read bytes',
      cause: error,
      location: _file.path,
    );
  }
});