parse static method

({BloomFilter filter, int next}) parse(Uint8List source, [ int offset = 0 ])

Parses a filter starting at offset; next reports the end offset.

Implementation

static ({BloomFilter filter, int next}) parse(
  Uint8List source, [
  int offset = 0,
]) {
  if (offset + 5 > source.length) {
    throw VxsFormatException('bloom filter header truncated', offset: offset);
  }
  final bitCount = VxsLe.u32(source, offset);
  final hashCount = source[offset + 4];
  final byteLength = (bitCount + 7) >> 3;
  final start = offset + 5;
  final end = start + byteLength;
  if (bitCount == 0 || end > source.length) {
    throw VxsFormatException('bloom filter is truncated', offset: offset);
  }
  if (hashCount == 0 || hashCount > 32) {
    throw VxsFormatException(
      'invalid bloom probe count $hashCount',
      offset: offset + 4,
    );
  }
  return (
    filter: BloomFilter._(
      Uint8List.sublistView(source, start, end),
      hashCount,
    ),
    next: end,
  );
}