isValidFile method

  1. @override
bool isValidFile(
  1. List<int> data
)

Is the given file a valid PNG image?

Implementation

@override
bool isValidFile(List<int> data) {
  final input = InputBuffer(data, bigEndian: true);
  final pngHeader = input.readBytes(8);
  const PNG_HEADER = [137, 80, 78, 71, 13, 10, 26, 10];
  for (var i = 0; i < 8; ++i) {
    if (pngHeader[i] != PNG_HEADER[i]) {
      return false;
    }
  }

  return true;
}