description

# UriData.fromString constructor Null safety

UriData.fromString(

1. String content,
2. {String? mimeType,
3. Encoding? encoding,
4. Map<String, String>? parameters,
5. bool base64: false}

)

Creates a `data:` URI containing the `content` string.

Equivalent to `new Uri.dataFromString(...).data`, but may be more efficient if the uri itself isn't used.

## Implementation

    factory UriData.fromString(String content,
        {String? mimeType,
        Encoding? encoding,
        Map<String, String>? parameters,
        bool base64 = false}) {
      StringBuffer buffer = StringBuffer();
      List<int> indices = [_noScheme];
      String? charsetName = parameters?["charset"];
      String? encodingName;
      if (encoding == null) {
        if (charsetName != null) {
          encoding = Encoding.getByName(charsetName);
        }
      } else if (charsetName == null) {
        // Non-null only if parameters does not contain "charset".
        encodingName = encoding.name;
      }
      encoding ??= ascii;
      _writeUri(mimeType, encodingName, parameters, buffer, indices);
      indices.add(buffer.length);
      if (base64) {
        buffer.write(';base64,');
        indices.add(buffer.length - 1);
        buffer.write(encoding.fuse(_base64).encode(content));
      } else {
        buffer.write(',');
        _uriEncodeBytes(_uricTable, encoding.encode(content), buffer);
      }
      return UriData._(buffer.toString(), indices, null);
    }