Reads a byte from the file. Returns a Future<int>
that completes with the byte, or with -1 if end-of-file has been reached.
Future<int> readByte();
© 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/2.0.0/dart-io/RandomAccessFile/readByte.html