decode static method

List<int> decode(String data, { bool validatePadding = true, bool urlSafe = true, })

Decodes a Base64 data string into bytes.

validatePadding: If true (default), requires input length to be a multiple of 4. If false, padding '=' is added automatically to fix length.

urlSafe: If true (default), treats input as URL-safe Base64, converting '-' to '+' and '_' to '/' before decoding. If false, throws if URL-safe characters are present.

Throws B64ConverterException on invalid input or length.

Implementation

static List<int> decode(
  String data, {
  bool validatePadding = true,
  bool urlSafe = true,
}) {
  if (validatePadding && data.length % 4 != 0) {
    throw B64ConverterException();
  } else if (!validatePadding) {
    while (data.length % 4 != 0) {
      data += '=';
    }
  }
  if (urlSafe) {
    data = data.replaceAll('-', '+').replaceAll('_', '/');
  } else if (data.contains('-') || data.contains('_')) {
    throw B64ConverterException();
  }
  final encoder = _Base64StreamDecoder();
  try {
    encoder.add(data);
    return encoder.finalize().clone();
  } finally {
    encoder.clean();
  }
}