//! This crate provides types for identifying git objects using a hash digest.//!//! These are provided in borrowed versions as well as owned ones.#![deny(unsafe_code)]#![deny(rust_2018_idioms, missing_docs)] mod borrowed;pub use borrowed::oid; #[allow(missing_docs)]mod owned;pub use owned::ObjectId; #[allow(missing_docs)]pub mod decode {    use std::str::FromStr;     use quick_error::quick_error;     use crate::owned::ObjectId;     quick_error! {        /// An error returned by [`ObjectId::from_40_bytes_in_hex()`]        #[derive(Debug)]        #[allow(missing_docs)]        pub enum Error {            InvalidHexEncodingLength(length: usize) {                display("A hash sized {} hexadecimal characters is invalid", length)            }        }    }     /// Hash decoding    impl ObjectId {        /// Create an instance from a `buffer` of 40 bytes encoded with hexadecimal notation.        ///        /// Such a buffer can be obtained using [`write_hex_to(buffer)`][ObjectId::write_hex_to()]        pub fn from_hex(buffer: &[u8]) -> Result<ObjectId, Error> {            use hex::FromHex;            match buffer.len() {                40 => Ok(ObjectId::Sha1(                    <[u8; 20]>::from_hex(buffer).expect("our length check is correct thus we can decode hex"),                )),                len => Err(Error::InvalidHexEncodingLength(len)),            }        }    }     impl FromStr for ObjectId {        type Err = Error;         fn from_str(s: &str) -> Result<Self, Self::Err> {            use hex::FromHex;            match s.len() {                40 => Ok(ObjectId::Sha1(                    <[u8; 20]>::from_hex(s).expect("our length check is correct thus we can decode hex"),                )),                len => Err(Error::InvalidHexEncodingLength(len)),            }        }    }} /// The size of a SHA1 hash digest in bytespub const SIZE_OF_SHA1_DIGEST: usize = 20; /// Denotes the kind of function to produce a `Id`#[derive(PartialEq, Eq, Debug, Hash, Ord, PartialOrd, Clone, Copy)]#[cfg_attr(feature = "serde1", derive(serde::Serialize, serde::Deserialize))]pub enum Kind {    /// The Sha1 hash with 160 bits.    Sha1,} impl Default for Kind {    fn default() -> Self {        Kind::Sha1    }} impl Kind {    /// Returns the shortest hash we support    pub const fn shortest() -> Self {        Self::Sha1    }     /// Returns the longest hash we support    pub const fn longest() -> Self {        Self::Sha1    }     /// Returns the amount of ascii-characters needed to encode this has in hex    pub const fn len_in_hex(&self) -> usize {        match self {            Kind::Sha1 => 40,        }    }}