page method

Uint8List page(
  1. int pageNumber
)

1-based page accessor. Returns the WAL-overridden version when one exists, otherwise reads the page out of the main file.

Implementation

Uint8List page(int pageNumber) {
  if (pageNumber < 1 || pageNumber > _logicalPageCount) {
    throw RangeError('page $pageNumber out of range '
        '(1..$_logicalPageCount)');
  }
  final overridden = _walOverrides[pageNumber];
  if (overridden != null) return overridden;
  if (pageNumber > header.dbSizeInPages) {
    // The WAL extended the file but didn't supply this page (corrupt
    // WAL or our caller asked for a page beyond the commit frame).
    throw RangeError('page $pageNumber not present in db or WAL');
  }
  final start = (pageNumber - 1) * header.pageSize;
  return Uint8List.sublistView(bytes, start, start + header.pageSize);
}