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//
// imag - the personal information management suite for the commandline
// Copyright (C) 2015-2018 Matthias Beyer <mail@beyermatthias.de> and contributors
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; version
// 2.1 of the License.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
//
use std::path::PathBuf;
use std::io::Read;
use crypto::sha1::Sha1;
use crypto::digest::Digest;
use error::Result;
/// The Hasher trait is used to implement custom hashing functions for the ref library.
/// This means that one can define how the hash of a reference is constructed from the content of
/// the file to ref to.
pub trait Hasher {
fn hash_name(&self) -> &'static str;
fn create_hash<R: Read>(&mut self, pb: &PathBuf, contents: &mut R) -> Result<String>;
}
pub struct DefaultHasher {
hasher: Sha1,
}
impl DefaultHasher {
pub fn new() -> DefaultHasher {
DefaultHasher { hasher: Sha1::new() }
}
}
impl Hasher for DefaultHasher {
fn hash_name(&self) -> &'static str {
"default"
}
fn create_hash<R: Read>(&mut self, _: &PathBuf, c: &mut R) -> Result<String> {
let mut s = String::new();
c.read_to_string(&mut s)?;
self.hasher.input_str(&s[..]);
Ok(self.hasher.result_str())
}
}
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