Function bodyOnlyHeaderHashBits

javascript/test/typemeta.test.ts:1591–1598

(buffer: Uint8Array)

}

function bodyOnlyHeaderHashBits(buffer: Uint8Array) {
  const hash = x64hash128(buffer, 47);
  let header = BigInt.asIntN(64, hash.getBigInt64(0, false) << HASH_SHIFT_BITS);
  if (header < 0n) {
    header = -header;
  }
  return BigInt.asUintN(64, header) & HEADER_HASH_MASK;
}