//! An object database storing each object in a zlib compressed file with its hash in the pathconst HEADER_READ_UNCOMPRESSED_BYTES: usize = 512;use std::path::{Path, PathBuf}; use git_features::fs; /// A database for reading and writing objects to disk, one file per object.#[derive(Clone, PartialEq, Eq)]pub struct Store {    /// The directory in which objects are stored, containing 256 folders representing the hashes first byte.    pub(crate) path: PathBuf,    /// The kind of hash we should assume during iteration and when writing new objects.    pub(crate) object_hash: git_hash::Kind,} /// Initializationimpl Store {    /// Initialize the Db with the `objects_directory` containing the hexadecimal first byte subdirectories, which in turn    /// contain all loose objects.    ///    /// In a git repository, this would be `.git/objects`.    ///    /// The `object_hash` determines which hash to use when writing, finding or iterating objects.    pub fn at(objects_directory: impl Into<PathBuf>, object_hash: git_hash::Kind) -> Store {        Store {            path: objects_directory.into(),            object_hash,        }    }     /// Return the path to our `objects` directory.    pub fn path(&self) -> &Path {        &self.path    }     /// Return the kind of hash we would iterate and write.    pub fn object_hash(&self) -> git_hash::Kind {        self.object_hash    }} fn hash_path(id: &git_hash::oid, mut root: PathBuf) -> PathBuf {    let mut hex = git_hash::Kind::hex_buf();    let hex_len = id.hex_to_buf(hex.as_mut());    let buf = std::str::from_utf8(&hex[..hex_len]).expect("ascii only in hex");    root.push(&buf[..2]);    root.push(&buf[2..]);    root} ///pub mod find;///pub mod iter;///pub mod verify; /// The type for an iterator over `Result<git_hash::ObjectId, Error>)`pub struct Iter {    inner: fs::walkdir::DirEntryIter,    hash_hex_len: usize,} ///pub mod write;