description

# convert method Null safety

Uint8List convert (

1. String input,
2. [int start = 0,
3. int? end]

)
override

Decodes the characters of `input` from `start` to `end` as base64.

If `start` is omitted, it defaults to the start of `input`. If `end` is omitted, it defaults to the end of `input`.

The returned Uint8List contains exactly the decoded bytes, so the `Uint8List.length` is precisely the number of decoded bytes. The `Uint8List.buffer` may be larger than the decoded bytes.

## Implementation

    Uint8List convert(String input, [int start = 0, int? end]) {
      end = RangeError.checkValidRange(start, end, input.length);
      // TODO(38725): Remove workaround when assignment promotion is implemented
      if (end == null) {
        throw RangeError("Invalid range");
      }
      if (start == end) return Uint8List(0);
      var decoder = _Base64Decoder();
      var buffer = decoder.decode(input, start, end)!;
      decoder.close(input, end);
      return buffer;
    }