head property

@override List<int> get head

the first bytes of the file. @Mimes and @Image read the real file type from them, and @Dimensions reads the image size. a file in memory gives all its bytes (no copy). a file on disk gives its first 128 KB, so the size of a JPEG after its photo metadata is still found.

Implementation

@override
List<int> get head {
  return _head ?? _bytes ?? const <int>[];
}