use std::io;
use crate::digest_engine::DigestEngine;

#[derive(Debug, Eq, PartialEq, Clone, Default)]
pub struct DigestEngineNone {}

impl DigestEngineNone {
    pub fn new() -> DigestEngineNone {
        DigestEngineNone {}
    }
}

impl DigestEngine for DigestEngineNone {
    fn create(&self) -> Box<dyn DigestEngine> {
        Box::new(Self::new())
    }

    fn update(&mut self, _data: &[u8]) -> io::Result<()> {
        Ok(())
    }

    fn finalize(&mut self) -> io::Result<String> {
        Ok("none".to_string())
    }
}