Function flag

src/extraction/kernel/decode.ts:53–56

Tri-state boolean from a (present, value) bit pair.

(flags: number, pair: number)

/** Tri-state boolean from a (present, value) bit pair. */
function flag(flags: number, pair: number): boolean | undefined {
  if ((flags & (1 << (pair * 2))) === 0) return undefined;
  return (flags & (1 << (pair * 2 + 1))) !== 0;
}

function u32opt(row: Buffer, at: number): number | undefined {
  const v = row.readUInt32LE(at);