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-rw-r--r--lib/entry/libimagentryref/src/hashers/nbytes.rs71
1 files changed, 71 insertions, 0 deletions
diff --git a/lib/entry/libimagentryref/src/hashers/nbytes.rs b/lib/entry/libimagentryref/src/hashers/nbytes.rs
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+//
+// imag - the personal information management suite for the commandline
+// Copyright (C) 2015, 2016 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::io::Read;
+use std::path::PathBuf;
+use std::result::Result as RResult;
+
+use crypto::sha1::Sha1;
+use crypto::digest::Digest;
+
+use libimagerror::into::IntoError;
+
+use hasher::Hasher;
+use result::Result;
+use error::RefErrorKind as REK;
+use error::MapErrInto;
+
+pub struct NBytesHasher {
+ hasher: Sha1,
+ n: usize,
+}
+
+impl NBytesHasher {
+
+ pub fn new(n: usize) -> NBytesHasher {
+ NBytesHasher {
+ hasher: Sha1::new(),
+ n: n,
+ }
+ }
+
+}
+
+impl Hasher for NBytesHasher {
+
+ fn hash_name(&self) -> &'static str {
+ "n-bytes-hasher"
+ }
+
+ fn create_hash<R: Read>(&mut self, _: &PathBuf, contents: &mut R) -> Result<String> {
+ let s = contents
+ .bytes()
+ .take(self.n)
+ .collect::<RResult<Vec<u8>, _>>()
+ .map_err_into(REK::IOError)
+ .and_then(|v| String::from_utf8(v).map_err_into(REK::IOError))
+ .map_err(Box::new)
+ .map_err(|e| REK::UTF8Error.into_error_with_cause(e))
+ .map_err_into(REK::IOError);
+ self.hasher.input_str(&try!(s)[..]);
+ Ok(self.hasher.result_str())
+ }
+
+}
+