writeUnsignedLong method
Writes an unsigned 8 byte long using the current endian format.
Converts a Dart
int
according to the semantics of [ByteData.setUint64`.
Implementation
void writeUnsignedLong(int v) {
final d = ByteData(8)..setUint64(0, v, endian);
_dest.add(d.buffer.asUint8List(d.offsetInBytes, 8));
}