readFromFile method
Reads the given amount of bytes from the file into the read buffer and resets the internal buffer position. If the capacity of the read buffer is too small, a larger one is created automatically.
@param length the amount of bytes to read from the file. @return true if the whole data was read successfully, false otherwise. @throws IOException if an error occurs while reading the file.
Implementation
@override
Future<Readbuffer> readFromFile(int length) async {
assert(length > 0);
Timing timing = Timing(log: _log);
_resource ??= _ReadBufferFileResource(filename);
Uint8List _bufferData = await _resource!.read(length);
Readbuffer result = Readbuffer(_bufferData, _position);
timing.done(100, "readFromFile position: $_position, length: $length");
_position += length;
return result;
}