//! Git stores all of its data as _Objects_, which are data along with a hash over all data. Storing objects efficiently//! is what git packs are concerned about.//!//! Packs consist of [data files][data::File] and [index files][index::File]. The latter can be generated from a data file//! and make accessing objects within a pack feasible.//!//! A [Bundle] conveniently combines a data pack alongside its index to allow [finding][Find] objects or verifying the pack.//! Objects returned by `.find(…)` are [objects][git_object::Data] which know their pack location in order to speed up//! various common operations like creating new packs from existing ones.//!//! When traversing all objects in a pack, a _delta tree acceleration structure_ can be built from pack data or an index//! in order to decompress packs in parallel and without any waste.//! ## Feature Flags#![cfg_attr(    feature = "document-features",    cfg_attr(doc, doc = ::document_features::document_features!()))]#![cfg_attr(docsrs, feature(doc_cfg, doc_auto_cfg))]#![deny(missing_docs, rust_2018_idioms, unsafe_code)] ///pub mod bundle;/// A bundle of pack data and the corresponding pack indexpub struct Bundle {    /// The pack file corresponding to `index`    pub pack: crate::data::File,    /// The index file corresponding to `pack`    pub index: crate::index::File,} ///pub mod find; ///pub mod cache;///pub mod data; mod find_traits; pub use find_traits::{Find, FindExt}; ///pub mod index;///pub mod multi_index; ///pub mod verify; mod mmap {    use std::path::Path;     pub fn read_only(path: &Path) -> std::io::Result<memmap2::Mmap> {        let file = std::fs::File::open(path)?;        // SAFETY: we have to take the risk of somebody changing the file underneath. Git never writes into the same file.        #[allow(unsafe_code)]        unsafe {            memmap2::Mmap::map(&file)        }    }} use std::convert::TryInto; #[inline]fn read_u32(b: &[u8]) -> u32 {    u32::from_be_bytes(b.try_into().unwrap())} #[inline]fn read_u64(b: &[u8]) -> u64 {    u64::from_be_bytes(b.try_into().unwrap())}