Synchronously reads into an existing List<int> from the file. If start is present, the bytes will be filled into buffer from at index start, otherwise index 0. If end is present, the end - start bytes will be read into buffer, otherwise up to buffer.length. If end == start nothing happens.
Throws a FileSystemException if the operation fails.
int readIntoSync(List<int> buffer, [int start = 0, int end]);
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https://api.dart.dev/stable/2.5.0/dart-io/RandomAccessFile/readIntoSync.html