convertByteToBit method
convert byte data to bit string value with length bits.
Implementation
String convertByteToBit(int length) {
var start = _index ~/ 8;
var end = ((_index + length) / 8).ceil();
var bitData = _rawData
.sublist(start, end)
.map((e) => e.toRadixString(2).padLeft(8, '0'))
.join('')
.substring(_index % 8, _index % 8 + length);
return bitData;
}