disktest 1.0.0

Hard Disk and Solid State Disk tester
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// -*- coding: utf-8 -*-
//
// disktest - Hard drive tester
//
// Copyright 2020 Michael Buesch <m@bues.ch>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//

mod buffer;
mod crc;
mod sha512;

pub use crate::hasher::sha512::HasherSHA512;
pub use crate::hasher::crc::HasherCRC;

pub trait NextHash {
    /// Get the size of the hash, in bytes.
    fn get_size(&self) -> usize;

    /// Generate the next hash and return a reference to it.
    fn next(&mut self) -> &[u8];

    /// Generate the next `count` number of hashes and
    /// append them to the provided `chunk_buffer`.
    fn next_chunk(&mut self,
                  chunk_buffer: &mut Vec<u8>,
                  count: usize) {
        for _ in 0..count {
            chunk_buffer.extend(self.next());
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_next_chunk() {
        struct X { i: usize }
        impl NextHash for X {
            fn get_size(&self) -> usize { 4 }
            fn next(&mut self) -> &[u8] {
                let i = self.i;
                self.i += 1;
                match i {
                    0 => &[1, 2, 3, 4],
                    1 => &[5, 6, 7, 8],
                    _ => panic!("Unknown index"),
                }
            }
        }

        let mut x = X { i: 0 };
        let mut buf = vec![];
        x.next_chunk(&mut buf, 2);
        assert_eq!(buf, vec![1, 2, 3, 4, 5, 6, 7, 8]);
    }
}

// vim: ts=4 sw=4 expandtab