49 lines
1.1 KiB
Rust
49 lines
1.1 KiB
Rust
use std::path::PathBuf;
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use std::io::Read;
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use error::RefErrorKind as REK;
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use error::MapErrInto;
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use crypto::sha1::Sha1;
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use crypto::digest::Digest;
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use result::Result;
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/// The Hasher trait is used to implement custom hashing functions for the ref library.
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/// This means that one can define how the hash of a reference is constructed from the content of
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/// the file to ref to.
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pub trait Hasher {
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fn hash_name(&self) -> &'static str;
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fn create_hash<R: Read>(&mut self, pb: &PathBuf, contents: &mut R) -> Result<String>;
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}
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pub struct DefaultHasher {
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hasher: Sha1,
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}
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impl DefaultHasher {
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pub fn new() -> DefaultHasher {
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DefaultHasher { hasher: Sha1::new() }
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}
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}
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impl Hasher for DefaultHasher {
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fn hash_name(&self) -> &'static str {
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"default"
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}
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fn create_hash<R: Read>(&mut self, _: &PathBuf, c: &mut R) -> Result<String> {
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let mut s = String::new();
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try!(c.read_to_string(&mut s).map_err_into(REK::UTF8Error).map_err_into(REK::IOError));
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self.hasher.input_str(&s[..]);
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Ok(self.hasher.result_str())
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}
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}
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