hexDecode function

List<int> hexDecode(
  1. String hexString
)

Decode a hexString into the original bytes.

Example:

hexDecode('0x0102030a'); // [1,2,3,10]
hexDecode('0a0b0102'); // [10,11,1,2]
hexDecode('000f010a'); // [0,15,1,10]
hexDecode('F0102'); // [15,1,2]

Implementation

List<int> hexDecode(String hexString) {
  var encoded =
      hexString.trim().replaceFirst(RegExp('^0x', caseSensitive: false), '');
  if (encoded.length % 2 != 0) {
    encoded = encoded.padLeft(encoded.length + 1, '0');
  }
  final decode = hex.decode(encoded);
  return decode;
}