toBytes static method

List<int> toBytes(BigInt val, { required int length, Endian order = Endian.big, })

Converts a BigInt to a list of bytes with the specified length and byte order.

The toBytes method takes a BigInt val, a required length parameter representing the desired length of the resulting byte list, and an optional order parameter (defaulting to big endian) specifying the byte order.

If the BigInt is zero, a list filled with zeros of the specified length is returned. Otherwise, the method converts the BigInt to a byte list, considering the specified length and byte order.

Example Usage:

BigInt value = BigInt.from(16909060);
`List<int>` byteList = BigIntUtils.toBytes(value, length: 4); // Result: [0x01, 0x02, 0x03, 0x04]

Parameters:

• val: The BigInt to be converted to a byte list.
• length: The desired length of the resulting byte list.
• order: The byte order to arrange the bytes in the resulting list (default is big endian). Returns: A list of bytes representing the BigInt with the specified length and byte order.

Implementation

static List<int> toBytes(BigInt val,
    {required int length, Endian order = Endian.big}) {
  if (val == BigInt.zero) {
    return List.filled(length, 0);
  }
  final BigInt bigMaskEight = BigInt.from(0xff);
  List<int> byteList = List<int>.filled(length, 0);
  for (var i = 0; i < length; i++) {
    byteList[length - i - 1] = (val & bigMaskEight).toInt();
    val = val >> 8;
  }

  if (order == Endian.little) {
    byteList = byteList.reversed.toList();
  }

  return List<int>.from(byteList);
}