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use std::io::SeekFrom;

pub trait Reader {
  fn open(filename: &String) -> Self;

  fn get_cache_size(&self) -> Option<usize>;
  fn set_cache_size(&mut self, cache_size: Option<usize>);

  fn get_position(&mut self) -> Result<u64, String>;
  fn get_size(&mut self) -> Result<u64, String>;

  fn read(&mut self, size: usize) -> Result<Vec<u8>, String>;
  fn seek(&mut self, seek: SeekFrom) -> Result<u64, String>;
}