rust: Rewrite dirstate parsing usin the `bytes-cast` crate

Differential Revision: https://phab.mercurial-scm.org/D10005

rust/Cargo.lock

@@ -1,1050 +1,1049
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rust/hg-core/Cargo.toml

@@ -1,50 +1,49
 [package]
 name = "hg-core"
 version = "0.1.0"
 authors = ["Georges Racinet <[e-mail]>"]
 description = "Mercurial pure Rust core library, with no assumption on Python bindings (FFI)"
 edition = "2018"
 
 [lib]
 name = "hg"
 
 [dependencies]
 bytes-cast = "0.1"
 byteorder = "1.3.4"
 derive_more = "0.99"
 home = "0.5"
 im-rc = "15.0.*"
 lazy_static = "1.4.0"
-memchr = "2.3.3"
 rand = "0.7.3"
 rand_pcg = "0.2.1"
 rand_distr = "0.2.2"
 rayon = "1.3.0"
 regex = "1.3.9"
 twox-hash = "1.5.0"
 same-file = "1.0.6"
 crossbeam-channel = "0.4"
 micro-timer = "0.3.0"
 log = "0.4.8"
 memmap = "0.7.0"
 zstd = "0.5.3"
 rust-crypto = "0.2.36"
 format-bytes = "0.2.0"
 
 # We don't use the `miniz-oxide` backend to not change rhg benchmarks and until
 # we have a clearer view of which backend is the fastest.
 [dependencies.flate2]
 version = "1.0.16"
 features = ["zlib"]
 default-features = false
 
 [dev-dependencies]
 clap = "*"
 pretty_assertions = "0.6.1"
 tempfile = "3.1.0"
 
 [features]
 # Use a (still unoptimized) tree for the dirstate instead of the current flat
 # dirstate. This is not yet recommended for performance reasons. A future
 # version might make it the default, or make it a runtime option.
 dirstate-tree = []

rust/hg-core/src/dirstate.rs

@@ -1,91 +1,103
 // dirstate module
 //
 // Copyright 2019 Raphaël Gomès <[e-mail]>
 //
 // This software may be used and distributed according to the terms of the
 // GNU General Public License version 2 or any later version.
 
 use crate::errors::HgError;
 use crate::{utils::hg_path::HgPathBuf, FastHashMap};
+use bytes_cast::{unaligned, BytesCast};
 use std::collections::hash_map;
 use std::convert::TryFrom;
 
 pub mod dirs_multiset;
 pub mod dirstate_map;
 #[cfg(feature = "dirstate-tree")]
 pub mod dirstate_tree;
 pub mod parsers;
 pub mod status;
 
-#[derive(Debug, PartialEq, Clone)]
+#[derive(Debug, PartialEq, Clone, BytesCast)]
+#[repr(C)]
 pub struct DirstateParents {
     pub p1: [u8; 20],
     pub p2: [u8; 20],
 }
 
 /// The C implementation uses all signed types. This will be an issue
 /// either when 4GB+ source files are commonplace or in 2038, whichever
 /// comes first.
 #[derive(Debug, PartialEq, Copy, Clone)]
 pub struct DirstateEntry {
     pub state: EntryState,
     pub mode: i32,
     pub mtime: i32,
     pub size: i32,
 }
 
+#[derive(BytesCast)]
+#[repr(C)]
+struct RawEntry {
+    state: u8,
+    mode: unaligned::I32Be,
+    size: unaligned::I32Be,
+    mtime: unaligned::I32Be,
+    length: unaligned::I32Be,
+}
+
 /// A `DirstateEntry` with a size of `-2` means that it was merged from the
 /// other parent. This allows revert to pick the right status back during a
 /// merge.
 pub const SIZE_FROM_OTHER_PARENT: i32 = -2;
 
 #[cfg(not(feature = "dirstate-tree"))]
 pub type StateMap = FastHashMap<HgPathBuf, DirstateEntry>;
 #[cfg(not(feature = "dirstate-tree"))]
 pub type StateMapIter<'a> = hash_map::Iter<'a, HgPathBuf, DirstateEntry>;
 
 #[cfg(feature = "dirstate-tree")]
 pub type StateMap = dirstate_tree::tree::Tree;
 #[cfg(feature = "dirstate-tree")]
 pub type StateMapIter<'a> = dirstate_tree::iter::Iter<'a>;
 pub type CopyMap = FastHashMap<HgPathBuf, HgPathBuf>;
 pub type CopyMapIter<'a> = hash_map::Iter<'a, HgPathBuf, HgPathBuf>;
 
 #[derive(Copy, Clone, Debug, Eq, PartialEq)]
 pub enum EntryState {
     Normal,
     Added,
     Removed,
     Merged,
     Unknown,
 }
 
 impl TryFrom<u8> for EntryState {
     type Error = HgError;
 
     fn try_from(value: u8) -> Result<Self, Self::Error> {
         match value {
             b'n' => Ok(EntryState::Normal),
             b'a' => Ok(EntryState::Added),
             b'r' => Ok(EntryState::Removed),
             b'm' => Ok(EntryState::Merged),
             b'?' => Ok(EntryState::Unknown),
             _ => Err(HgError::CorruptedRepository(format!(
                 "Incorrect dirstate entry state {}",
                 value
             ))),
         }
     }
 }
 
 impl Into<u8> for EntryState {
     fn into(self) -> u8 {
         match self {
             EntryState::Normal => b'n',
             EntryState::Added => b'a',
             EntryState::Removed => b'r',
             EntryState::Merged => b'm',
             EntryState::Unknown => b'?',
         }
     }
 }

rust/hg-core/src/dirstate/dirstate_map.rs

@@ -1,549 +1,549
 // dirstate_map.rs
 //
 // Copyright 2019 Raphaël Gomès <[e-mail]>
 //
 // This software may be used and distributed according to the terms of the
 // GNU General Public License version 2 or any later version.
 
 use crate::errors::HgError;
 use crate::revlog::node::NULL_NODE_ID;
 use crate::{
     dirstate::{parsers::PARENT_SIZE, EntryState, SIZE_FROM_OTHER_PARENT},
     pack_dirstate, parse_dirstate,
     utils::{
         files::normalize_case,
         hg_path::{HgPath, HgPathBuf},
     },
     CopyMap, DirsMultiset, DirstateEntry, DirstateError, DirstateMapError,
     DirstateParents, FastHashMap, StateMap,
 };
 use micro_timer::timed;
 use std::collections::HashSet;
 use std::convert::TryInto;
 use std::iter::FromIterator;
 use std::ops::Deref;
 use std::time::Duration;
 
 pub type FileFoldMap = FastHashMap<HgPathBuf, HgPathBuf>;
 
 const MTIME_UNSET: i32 = -1;
 
 #[derive(Default)]
 pub struct DirstateMap {
     state_map: StateMap,
     pub copy_map: CopyMap,
     file_fold_map: Option<FileFoldMap>,
     pub dirs: Option<DirsMultiset>,
     pub all_dirs: Option<DirsMultiset>,
     non_normal_set: Option<HashSet<HgPathBuf>>,
     other_parent_set: Option<HashSet<HgPathBuf>>,
     parents: Option<DirstateParents>,
     dirty_parents: bool,
 }
 
 /// Should only really be used in python interface code, for clarity
 impl Deref for DirstateMap {
     type Target = StateMap;
 
     fn deref(&self) -> &Self::Target {
         &self.state_map
     }
 }
 
 impl FromIterator<(HgPathBuf, DirstateEntry)> for DirstateMap {
     fn from_iter<I: IntoIterator<Item = (HgPathBuf, DirstateEntry)>>(
         iter: I,
     ) -> Self {
         Self {
             state_map: iter.into_iter().collect(),
             ..Self::default()
         }
     }
 }
 
 impl DirstateMap {
     pub fn new() -> Self {
         Self::default()
     }
 
     pub fn clear(&mut self) {
         self.state_map = StateMap::default();
         self.copy_map.clear();
         self.file_fold_map = None;
         self.non_normal_set = None;
         self.other_parent_set = None;
         self.set_parents(&DirstateParents {
             p1: NULL_NODE_ID,
             p2: NULL_NODE_ID,
         })
     }
 
     /// Add a tracked file to the dirstate
     pub fn add_file(
         &mut self,
         filename: &HgPath,
         old_state: EntryState,
         entry: DirstateEntry,
     ) -> Result<(), DirstateMapError> {
         if old_state == EntryState::Unknown || old_state == EntryState::Removed
         {
             if let Some(ref mut dirs) = self.dirs {
                 dirs.add_path(filename)?;
             }
         }
         if old_state == EntryState::Unknown {
             if let Some(ref mut all_dirs) = self.all_dirs {
                 all_dirs.add_path(filename)?;
             }
         }
         self.state_map.insert(filename.to_owned(), entry.to_owned());
 
         if entry.state != EntryState::Normal || entry.mtime == MTIME_UNSET {
             self.get_non_normal_other_parent_entries()
                 .0
                 .insert(filename.to_owned());
         }
 
         if entry.size == SIZE_FROM_OTHER_PARENT {
             self.get_non_normal_other_parent_entries()
                 .1
                 .insert(filename.to_owned());
         }
         Ok(())
     }
 
     /// Mark a file as removed in the dirstate.
     ///
     /// The `size` parameter is used to store sentinel values that indicate
     /// the file's previous state.  In the future, we should refactor this
     /// to be more explicit about what that state is.
     pub fn remove_file(
         &mut self,
         filename: &HgPath,
         old_state: EntryState,
         size: i32,
     ) -> Result<(), DirstateMapError> {
         if old_state != EntryState::Unknown && old_state != EntryState::Removed
         {
             if let Some(ref mut dirs) = self.dirs {
                 dirs.delete_path(filename)?;
             }
         }
         if old_state == EntryState::Unknown {
             if let Some(ref mut all_dirs) = self.all_dirs {
                 all_dirs.add_path(filename)?;
             }
         }
 
         if let Some(ref mut file_fold_map) = self.file_fold_map {
             file_fold_map.remove(&normalize_case(filename));
         }
         self.state_map.insert(
             filename.to_owned(),
             DirstateEntry {
                 state: EntryState::Removed,
                 mode: 0,
                 size,
                 mtime: 0,
             },
         );
         self.get_non_normal_other_parent_entries()
             .0
             .insert(filename.to_owned());
         Ok(())
     }
 
     /// Remove a file from the dirstate.
     /// Returns `true` if the file was previously recorded.
     pub fn drop_file(
         &mut self,
         filename: &HgPath,
         old_state: EntryState,
     ) -> Result<bool, DirstateMapError> {
         let exists = self.state_map.remove(filename).is_some();
 
         if exists {
             if old_state != EntryState::Removed {
                 if let Some(ref mut dirs) = self.dirs {
                     dirs.delete_path(filename)?;
                 }
             }
             if let Some(ref mut all_dirs) = self.all_dirs {
                 all_dirs.delete_path(filename)?;
             }
         }
         if let Some(ref mut file_fold_map) = self.file_fold_map {
             file_fold_map.remove(&normalize_case(filename));
         }
         self.get_non_normal_other_parent_entries()
             .0
             .remove(filename);
 
         Ok(exists)
     }
 
     pub fn clear_ambiguous_times(
         &mut self,
         filenames: Vec<HgPathBuf>,
         now: i32,
     ) {
         for filename in filenames {
             let mut changed = false;
             if let Some(entry) = self.state_map.get_mut(&filename) {
                 if entry.state == EntryState::Normal && entry.mtime == now {
                     changed = true;
                     *entry = DirstateEntry {
                         mtime: MTIME_UNSET,
                         ..*entry
                     };
                 }
             }
             if changed {
                 self.get_non_normal_other_parent_entries()
                     .0
                     .insert(filename.to_owned());
             }
         }
     }
 
     pub fn non_normal_entries_remove(
         &mut self,
         key: impl AsRef<HgPath>,
     ) -> bool {
         self.get_non_normal_other_parent_entries()
             .0
             .remove(key.as_ref())
     }
     pub fn non_normal_entries_union(
         &mut self,
         other: HashSet<HgPathBuf>,
     ) -> Vec<HgPathBuf> {
         self.get_non_normal_other_parent_entries()
             .0
             .union(&other)
             .map(ToOwned::to_owned)
             .collect()
     }
 
     pub fn get_non_normal_other_parent_entries(
         &mut self,
     ) -> (&mut HashSet<HgPathBuf>, &mut HashSet<HgPathBuf>) {
         self.set_non_normal_other_parent_entries(false);
         (
             self.non_normal_set.as_mut().unwrap(),
             self.other_parent_set.as_mut().unwrap(),
         )
     }
 
     /// Useful to get immutable references to those sets in contexts where
     /// you only have an immutable reference to the `DirstateMap`, like when
     /// sharing references with Python.
     ///
     /// TODO, get rid of this along with the other "setter/getter" stuff when
     /// a nice typestate plan is defined.
     ///
     /// # Panics
     ///
     /// Will panic if either set is `None`.
     pub fn get_non_normal_other_parent_entries_panic(
         &self,
     ) -> (&HashSet<HgPathBuf>, &HashSet<HgPathBuf>) {
         (
             self.non_normal_set.as_ref().unwrap(),
             self.other_parent_set.as_ref().unwrap(),
         )
     }
 
     #[cfg(not(feature = "dirstate-tree"))]
     pub fn set_non_normal_other_parent_entries(&mut self, force: bool) {
         if !force
             && self.non_normal_set.is_some()
             && self.other_parent_set.is_some()
         {
             return;
         }
         let mut non_normal = HashSet::new();
         let mut other_parent = HashSet::new();
 
         for (
             filename,
             DirstateEntry {
                 state, size, mtime, ..
             },
         ) in self.state_map.iter()
         {
             if *state != EntryState::Normal || *mtime == MTIME_UNSET {
                 non_normal.insert(filename.to_owned());
             }
             if *state == EntryState::Normal && *size == SIZE_FROM_OTHER_PARENT
             {
                 other_parent.insert(filename.to_owned());
             }
         }
         self.non_normal_set = Some(non_normal);
         self.other_parent_set = Some(other_parent);
     }
     #[cfg(feature = "dirstate-tree")]
     pub fn set_non_normal_other_parent_entries(&mut self, force: bool) {
         if !force
             && self.non_normal_set.is_some()
             && self.other_parent_set.is_some()
         {
             return;
         }
         let mut non_normal = HashSet::new();
         let mut other_parent = HashSet::new();
 
         for (
             filename,
             DirstateEntry {
                 state, size, mtime, ..
             },
         ) in self.state_map.iter()
         {
             if state != EntryState::Normal || mtime == MTIME_UNSET {
                 non_normal.insert(filename.to_owned());
             }
             if state == EntryState::Normal && size == SIZE_FROM_OTHER_PARENT {
                 other_parent.insert(filename.to_owned());
             }
         }
         self.non_normal_set = Some(non_normal);
         self.other_parent_set = Some(other_parent);
     }
 
     /// Both of these setters and their uses appear to be the simplest way to
     /// emulate a Python lazy property, but it is ugly and unidiomatic.
     /// TODO One day, rewriting this struct using the typestate might be a
     /// good idea.
     pub fn set_all_dirs(&mut self) -> Result<(), DirstateMapError> {
         if self.all_dirs.is_none() {
             self.all_dirs =
                 Some(DirsMultiset::from_dirstate(&self.state_map, None)?);
         }
         Ok(())
     }
 
     pub fn set_dirs(&mut self) -> Result<(), DirstateMapError> {
         if self.dirs.is_none() {
             self.dirs = Some(DirsMultiset::from_dirstate(
                 &self.state_map,
                 Some(EntryState::Removed),
             )?);
         }
         Ok(())
     }
 
     pub fn has_tracked_dir(
         &mut self,
         directory: &HgPath,
     ) -> Result<bool, DirstateMapError> {
         self.set_dirs()?;
         Ok(self.dirs.as_ref().unwrap().contains(directory))
     }
 
     pub fn has_dir(
         &mut self,
         directory: &HgPath,
     ) -> Result<bool, DirstateMapError> {
         self.set_all_dirs()?;
         Ok(self.all_dirs.as_ref().unwrap().contains(directory))
     }
 
     pub fn parents(
         &mut self,
         file_contents: &[u8],
     ) -> Result<&DirstateParents, DirstateError> {
         if let Some(ref parents) = self.parents {
             return Ok(parents);
         }
         let parents;
         if file_contents.len() == PARENT_SIZE * 2 {
             parents = DirstateParents {
                 p1: file_contents[..PARENT_SIZE].try_into().unwrap(),
                 p2: file_contents[PARENT_SIZE..PARENT_SIZE * 2]
                     .try_into()
                     .unwrap(),
             };
         } else if file_contents.is_empty() {
             parents = DirstateParents {
                 p1: NULL_NODE_ID,
                 p2: NULL_NODE_ID,
             };
         } else {
             return Err(
                 HgError::corrupted("Dirstate appears to be damaged").into()
             );
         }
 
         self.parents = Some(parents);
         Ok(self.parents.as_ref().unwrap())
     }
 
     pub fn set_parents(&mut self, parents: &DirstateParents) {
         self.parents = Some(parents.clone());
         self.dirty_parents = true;
     }
 
     #[timed]
-    pub fn read(
+    pub fn read<'a>(
         &mut self,
-        file_contents: &[u8],
-    ) -> Result<Option<DirstateParents>, DirstateError> {
+        file_contents: &'a [u8],
+    ) -> Result<Option<&'a DirstateParents>, DirstateError> {
         if file_contents.is_empty() {
             return Ok(None);
         }
 
         let (parents, entries, copies) = parse_dirstate(file_contents)?;
         self.state_map.extend(
             entries
                 .into_iter()
                 .map(|(path, entry)| (path.to_owned(), entry)),
         );
         self.copy_map.extend(
             copies
                 .into_iter()
                 .map(|(path, copy)| (path.to_owned(), copy.to_owned())),
         );
 
         if !self.dirty_parents {
             self.set_parents(&parents);
         }
 
         Ok(Some(parents))
     }
 
     pub fn pack(
         &mut self,
         parents: DirstateParents,
         now: Duration,
     ) -> Result<Vec<u8>, DirstateError> {
         let packed =
             pack_dirstate(&mut self.state_map, &self.copy_map, parents, now)?;
 
         self.dirty_parents = false;
 
         self.set_non_normal_other_parent_entries(true);
         Ok(packed)
     }
     #[cfg(not(feature = "dirstate-tree"))]
     pub fn build_file_fold_map(&mut self) -> &FileFoldMap {
         if let Some(ref file_fold_map) = self.file_fold_map {
             return file_fold_map;
         }
         let mut new_file_fold_map = FileFoldMap::default();
 
         for (filename, DirstateEntry { state, .. }) in self.state_map.iter() {
             if *state != EntryState::Removed {
                 new_file_fold_map
                     .insert(normalize_case(&filename), filename.to_owned());
             }
         }
         self.file_fold_map = Some(new_file_fold_map);
         self.file_fold_map.as_ref().unwrap()
     }
     #[cfg(feature = "dirstate-tree")]
     pub fn build_file_fold_map(&mut self) -> &FileFoldMap {
         if let Some(ref file_fold_map) = self.file_fold_map {
             return file_fold_map;
         }
         let mut new_file_fold_map = FileFoldMap::default();
 
         for (filename, DirstateEntry { state, .. }) in self.state_map.iter() {
             if state != EntryState::Removed {
                 new_file_fold_map
                     .insert(normalize_case(&filename), filename.to_owned());
             }
         }
         self.file_fold_map = Some(new_file_fold_map);
         self.file_fold_map.as_ref().unwrap()
     }
 }
 
 #[cfg(test)]
 mod tests {
     use super::*;
 
     #[test]
     fn test_dirs_multiset() {
         let mut map = DirstateMap::new();
         assert!(map.dirs.is_none());
         assert!(map.all_dirs.is_none());
 
         assert_eq!(map.has_dir(HgPath::new(b"nope")).unwrap(), false);
         assert!(map.all_dirs.is_some());
         assert!(map.dirs.is_none());
 
         assert_eq!(map.has_tracked_dir(HgPath::new(b"nope")).unwrap(), false);
         assert!(map.dirs.is_some());
     }
 
     #[test]
     fn test_add_file() {
         let mut map = DirstateMap::new();
 
         assert_eq!(0, map.len());
 
         map.add_file(
             HgPath::new(b"meh"),
             EntryState::Normal,
             DirstateEntry {
                 state: EntryState::Normal,
                 mode: 1337,
                 mtime: 1337,
                 size: 1337,
             },
         )
         .unwrap();
 
         assert_eq!(1, map.len());
         assert_eq!(0, map.get_non_normal_other_parent_entries().0.len());
         assert_eq!(0, map.get_non_normal_other_parent_entries().1.len());
     }
 
     #[test]
     fn test_non_normal_other_parent_entries() {
         let mut map: DirstateMap = [
             (b"f1", (EntryState::Removed, 1337, 1337, 1337)),
             (b"f2", (EntryState::Normal, 1337, 1337, -1)),
             (b"f3", (EntryState::Normal, 1337, 1337, 1337)),
             (b"f4", (EntryState::Normal, 1337, -2, 1337)),
             (b"f5", (EntryState::Added, 1337, 1337, 1337)),
             (b"f6", (EntryState::Added, 1337, 1337, -1)),
             (b"f7", (EntryState::Merged, 1337, 1337, -1)),
             (b"f8", (EntryState::Merged, 1337, 1337, 1337)),
             (b"f9", (EntryState::Merged, 1337, -2, 1337)),
             (b"fa", (EntryState::Added, 1337, -2, 1337)),
             (b"fb", (EntryState::Removed, 1337, -2, 1337)),
         ]
         .iter()
         .map(|(fname, (state, mode, size, mtime))| {
             (
                 HgPathBuf::from_bytes(fname.as_ref()),
                 DirstateEntry {
                     state: *state,
                     mode: *mode,
                     size: *size,
                     mtime: *mtime,
                 },
             )
         })
         .collect();
 
         let mut non_normal = [
             b"f1", b"f2", b"f5", b"f6", b"f7", b"f8", b"f9", b"fa", b"fb",
         ]
         .iter()
         .map(|x| HgPathBuf::from_bytes(x.as_ref()))
         .collect();
 
         let mut other_parent = HashSet::new();
         other_parent.insert(HgPathBuf::from_bytes(b"f4"));
         let entries = map.get_non_normal_other_parent_entries();
 
         assert_eq!(
             (&mut non_normal, &mut other_parent),
             (entries.0, entries.1)
         );
     }
 }

rust/hg-core/src/dirstate/parsers.rs

@@ -1,520 +1,500
 // Copyright 2019 Raphaël Gomès <[e-mail]>
 //
 // This software may be used and distributed according to the terms of the
 // GNU General Public License version 2 or any later version.
 
 use crate::errors::HgError;
 use crate::utils::hg_path::HgPath;
 use crate::{
-    dirstate::{CopyMap, EntryState, StateMap},
+    dirstate::{CopyMap, EntryState, RawEntry, StateMap},
     DirstateEntry, DirstateParents,
 };
-use byteorder::{BigEndian, ReadBytesExt, WriteBytesExt};
+use byteorder::{BigEndian, WriteBytesExt};
+use bytes_cast::BytesCast;
 use micro_timer::timed;
 use std::convert::{TryFrom, TryInto};
-use std::io::Cursor;
 use std::time::Duration;
 
 /// Parents are stored in the dirstate as byte hashes.
 pub const PARENT_SIZE: usize = 20;
 /// Dirstate entries have a static part of 8 + 32 + 32 + 32 + 32 bits.
 const MIN_ENTRY_SIZE: usize = 17;
 
 type ParseResult<'a> = (
-    DirstateParents,
+    &'a DirstateParents,
     Vec<(&'a HgPath, DirstateEntry)>,
     Vec<(&'a HgPath, &'a HgPath)>,
 );
 
 #[timed]
-pub fn parse_dirstate(contents: &[u8]) -> Result<ParseResult, HgError> {
-    if contents.len() < PARENT_SIZE * 2 {
-        return Err(HgError::corrupted("Too little data for dirstate."));
-    }
-    let mut copies = vec![];
-    let mut entries = vec![];
+pub fn parse_dirstate(mut contents: &[u8]) -> Result<ParseResult, HgError> {
+    let mut copies = Vec::new();
+    let mut entries = Vec::new();
 
-    let mut curr_pos = PARENT_SIZE * 2;
-    let parents = DirstateParents {
-        p1: contents[..PARENT_SIZE].try_into().unwrap(),
-        p2: contents[PARENT_SIZE..curr_pos].try_into().unwrap(),
-    };
+    let (parents, rest) = DirstateParents::from_bytes(contents)
+        .map_err(|_| HgError::corrupted("Too little data for dirstate."))?;
+    contents = rest;
+    while !contents.is_empty() {
+        let (raw_entry, rest) = RawEntry::from_bytes(contents)
+            .map_err(|_| HgError::corrupted("Overflow in dirstate."))?;
 
-    while curr_pos < contents.len() {
-        if curr_pos + MIN_ENTRY_SIZE > contents.len() {
-            return Err(HgError::corrupted("Overflow in dirstate."));
-        }
-        let entry_bytes = &contents[curr_pos..];
+        let entry = DirstateEntry {
+            state: EntryState::try_from(raw_entry.state)?,
+            mode: raw_entry.mode.get(),
+            mtime: raw_entry.mtime.get(),
+            size: raw_entry.size.get(),
+        };
+        let (paths, rest) =
+            u8::slice_from_bytes(rest, raw_entry.length.get() as usize)
+                .map_err(|_| HgError::corrupted("Overflow in dirstate."))?;
 
-        let mut cursor = Cursor::new(entry_bytes);
-        // Unwraping errors from `byteorder` as we’ve already checked
-        // `MIN_ENTRY_SIZE` so the input should never be too short.
-        let state = EntryState::try_from(cursor.read_u8().unwrap())?;
-        let mode = cursor.read_i32::<BigEndian>().unwrap();
-        let size = cursor.read_i32::<BigEndian>().unwrap();
-        let mtime = cursor.read_i32::<BigEndian>().unwrap();
-        let path_len = cursor.read_i32::<BigEndian>().unwrap() as usize;
-
-        if path_len > contents.len() - curr_pos {
-            return Err(HgError::corrupted("Overflow in dirstate."));
+        // `paths` is either a single path, or two paths separated by a NULL
+        // byte
+        let mut iter = paths.splitn(2, |&byte| byte == b'\0');
+        let path = HgPath::new(
+            iter.next().expect("splitn always yields at least one item"),
+        );
+        if let Some(copy_source) = iter.next() {
+            copies.push((path, HgPath::new(copy_source)));
         }
 
-        // Slice instead of allocating a Vec needed for `read_exact`
-        let path = &entry_bytes[MIN_ENTRY_SIZE..MIN_ENTRY_SIZE + (path_len)];
-
-        let (path, copy) = match memchr::memchr(0, path) {
-            None => (path, None),
-            Some(i) => (&path[..i], Some(&path[(i + 1)..])),
-        };
-
-        if let Some(copy_path) = copy {
-            copies.push((HgPath::new(path), HgPath::new(copy_path)));
-        };
-        entries.push((
-            HgPath::new(path),
-            DirstateEntry {
-                state,
-                mode,
-                size,
-                mtime,
-            },
-        ));
-        curr_pos = curr_pos + MIN_ENTRY_SIZE + (path_len);
+        entries.push((path, entry));
+        contents = rest;
     }
     Ok((parents, entries, copies))
 }
 
 /// `now` is the duration in seconds since the Unix epoch
 #[cfg(not(feature = "dirstate-tree"))]
 pub fn pack_dirstate(
     state_map: &mut StateMap,
     copy_map: &CopyMap,
     parents: DirstateParents,
     now: Duration,
 ) -> Result<Vec<u8>, HgError> {
     // TODO move away from i32 before 2038.
     let now: i32 = now.as_secs().try_into().expect("time overflow");
 
     let expected_size: usize = state_map
         .iter()
         .map(|(filename, _)| {
             let mut length = MIN_ENTRY_SIZE + filename.len();
             if let Some(copy) = copy_map.get(filename) {
                 length += copy.len() + 1;
             }
             length
         })
         .sum();
     let expected_size = expected_size + PARENT_SIZE * 2;
 
     let mut packed = Vec::with_capacity(expected_size);
 
     packed.extend(&parents.p1);
     packed.extend(&parents.p2);
 
     for (filename, entry) in state_map.iter_mut() {
         let new_filename = filename.to_owned();
         let mut new_mtime: i32 = entry.mtime;
         if entry.state == EntryState::Normal && entry.mtime == now {
             // The file was last modified "simultaneously" with the current
             // write to dirstate (i.e. within the same second for file-
             // systems with a granularity of 1 sec). This commonly happens
             // for at least a couple of files on 'update'.
             // The user could change the file without changing its size
             // within the same second. Invalidate the file's mtime in
             // dirstate, forcing future 'status' calls to compare the
             // contents of the file if the size is the same. This prevents
             // mistakenly treating such files as clean.
             new_mtime = -1;
             *entry = DirstateEntry {
                 mtime: new_mtime,
                 ..*entry
             };
         }
         let mut new_filename = new_filename.into_vec();
         if let Some(copy) = copy_map.get(filename) {
             new_filename.push(b'\0');
             new_filename.extend(copy.bytes());
         }
 
         // Unwrapping because `impl std::io::Write for Vec<u8>` never errors
         packed.write_u8(entry.state.into()).unwrap();
         packed.write_i32::<BigEndian>(entry.mode).unwrap();
         packed.write_i32::<BigEndian>(entry.size).unwrap();
         packed.write_i32::<BigEndian>(new_mtime).unwrap();
         packed
             .write_i32::<BigEndian>(new_filename.len() as i32)
             .unwrap();
         packed.extend(new_filename)
     }
 
     if packed.len() != expected_size {
         return Err(HgError::CorruptedRepository(format!(
             "bad dirstate size: {} != {}",
             expected_size,
             packed.len()
         )));
     }
 
     Ok(packed)
 }
 /// `now` is the duration in seconds since the Unix epoch
 #[cfg(feature = "dirstate-tree")]
 pub fn pack_dirstate(
     state_map: &mut StateMap,
     copy_map: &CopyMap,
     parents: DirstateParents,
     now: Duration,
 ) -> Result<Vec<u8>, DirstatePackError> {
     // TODO move away from i32 before 2038.
     let now: i32 = now.as_secs().try_into().expect("time overflow");
 
     let expected_size: usize = state_map
         .iter()
         .map(|(filename, _)| {
             let mut length = MIN_ENTRY_SIZE + filename.len();
             if let Some(copy) = copy_map.get(&filename) {
                 length += copy.len() + 1;
             }
             length
         })
         .sum();
     let expected_size = expected_size + PARENT_SIZE * 2;
 
     let mut packed = Vec::with_capacity(expected_size);
     let mut new_state_map = vec![];
 
     packed.extend(&parents.p1);
     packed.extend(&parents.p2);
 
     for (filename, entry) in state_map.iter() {
         let new_filename = filename.to_owned();
         let mut new_mtime: i32 = entry.mtime;
         if entry.state == EntryState::Normal && entry.mtime == now {
             // The file was last modified "simultaneously" with the current
             // write to dirstate (i.e. within the same second for file-
             // systems with a granularity of 1 sec). This commonly happens
             // for at least a couple of files on 'update'.
             // The user could change the file without changing its size
             // within the same second. Invalidate the file's mtime in
             // dirstate, forcing future 'status' calls to compare the
             // contents of the file if the size is the same. This prevents
             // mistakenly treating such files as clean.
             new_mtime = -1;
             new_state_map.push((
                 filename.to_owned(),
                 DirstateEntry {
                     mtime: new_mtime,
                     ..entry
                 },
             ));
         }
         let mut new_filename = new_filename.into_vec();
         if let Some(copy) = copy_map.get(&filename) {
             new_filename.push(b'\0');
             new_filename.extend(copy.bytes());
         }
 
         packed.write_u8(entry.state.into())?;
         packed.write_i32::<BigEndian>(entry.mode)?;
         packed.write_i32::<BigEndian>(entry.size)?;
         packed.write_i32::<BigEndian>(new_mtime)?;
         packed.write_i32::<BigEndian>(new_filename.len() as i32)?;
         packed.extend(new_filename)
     }
 
     if packed.len() != expected_size {
         return Err(DirstatePackError::BadSize(expected_size, packed.len()));
     }
 
     state_map.extend(new_state_map);
 
     Ok(packed)
 }
 
 #[cfg(test)]
 mod tests {
     use super::*;
     use crate::{utils::hg_path::HgPathBuf, FastHashMap};
     use pretty_assertions::assert_eq;
 
     #[test]
     fn test_pack_dirstate_empty() {
         let mut state_map = StateMap::default();
         let copymap = FastHashMap::default();
         let parents = DirstateParents {
             p1: *b"12345678910111213141",
             p2: *b"00000000000000000000",
         };
         let now = Duration::new(15000000, 0);
         let expected = b"1234567891011121314100000000000000000000".to_vec();
 
         assert_eq!(
             expected,
             pack_dirstate(&mut state_map, &copymap, parents, now).unwrap()
         );
 
         assert!(state_map.is_empty())
     }
     #[test]
     fn test_pack_dirstate_one_entry() {
         let expected_state_map: StateMap = [(
             HgPathBuf::from_bytes(b"f1"),
             DirstateEntry {
                 state: EntryState::Normal,
                 mode: 0o644,
                 size: 0,
                 mtime: 791231220,
             },
         )]
         .iter()
         .cloned()
         .collect();
         let mut state_map = expected_state_map.clone();
 
         let copymap = FastHashMap::default();
         let parents = DirstateParents {
             p1: *b"12345678910111213141",
             p2: *b"00000000000000000000",
         };
         let now = Duration::new(15000000, 0);
         let expected = [
             49, 50, 51, 52, 53, 54, 55, 56, 57, 49, 48, 49, 49, 49, 50, 49,
             51, 49, 52, 49, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48,
             48, 48, 48, 48, 48, 48, 48, 48, 110, 0, 0, 1, 164, 0, 0, 0, 0, 47,
             41, 58, 244, 0, 0, 0, 2, 102, 49,
         ]
         .to_vec();
 
         assert_eq!(
             expected,
             pack_dirstate(&mut state_map, &copymap, parents, now).unwrap()
         );
 
         assert_eq!(expected_state_map, state_map);
     }
     #[test]
     fn test_pack_dirstate_one_entry_with_copy() {
         let expected_state_map: StateMap = [(
             HgPathBuf::from_bytes(b"f1"),
             DirstateEntry {
                 state: EntryState::Normal,
                 mode: 0o644,
                 size: 0,
                 mtime: 791231220,
             },
         )]
         .iter()
         .cloned()
         .collect();
         let mut state_map = expected_state_map.clone();
         let mut copymap = FastHashMap::default();
         copymap.insert(
             HgPathBuf::from_bytes(b"f1"),
             HgPathBuf::from_bytes(b"copyname"),
         );
         let parents = DirstateParents {
             p1: *b"12345678910111213141",
             p2: *b"00000000000000000000",
         };
         let now = Duration::new(15000000, 0);
         let expected = [
             49, 50, 51, 52, 53, 54, 55, 56, 57, 49, 48, 49, 49, 49, 50, 49,
             51, 49, 52, 49, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48,
             48, 48, 48, 48, 48, 48, 48, 48, 110, 0, 0, 1, 164, 0, 0, 0, 0, 47,
             41, 58, 244, 0, 0, 0, 11, 102, 49, 0, 99, 111, 112, 121, 110, 97,
             109, 101,
         ]
         .to_vec();
 
         assert_eq!(
             expected,
             pack_dirstate(&mut state_map, &copymap, parents, now).unwrap()
         );
         assert_eq!(expected_state_map, state_map);
     }
 
     #[test]
     fn test_parse_pack_one_entry_with_copy() {
         let mut state_map: StateMap = [(
             HgPathBuf::from_bytes(b"f1"),
             DirstateEntry {
                 state: EntryState::Normal,
                 mode: 0o644,
                 size: 0,
                 mtime: 791231220,
             },
         )]
         .iter()
         .cloned()
         .collect();
         let mut copymap = FastHashMap::default();
         copymap.insert(
             HgPathBuf::from_bytes(b"f1"),
             HgPathBuf::from_bytes(b"copyname"),
         );
         let parents = DirstateParents {
             p1: *b"12345678910111213141",
             p2: *b"00000000000000000000",
         };
         let now = Duration::new(15000000, 0);
         let result =
             pack_dirstate(&mut state_map, &copymap, parents.clone(), now)
                 .unwrap();
 
         let (new_parents, entries, copies) =
             parse_dirstate(result.as_slice()).unwrap();
         let new_state_map: StateMap = entries
             .into_iter()
             .map(|(path, entry)| (path.to_owned(), entry))
             .collect();
         let new_copy_map: CopyMap = copies
             .into_iter()
             .map(|(path, copy)| (path.to_owned(), copy.to_owned()))
             .collect();
 
         assert_eq!(
-            (parents, state_map, copymap),
+            (&parents, state_map, copymap),
             (new_parents, new_state_map, new_copy_map)
         )
     }
 
     #[test]
     fn test_parse_pack_multiple_entries_with_copy() {
         let mut state_map: StateMap = [
             (
                 HgPathBuf::from_bytes(b"f1"),
                 DirstateEntry {
                     state: EntryState::Normal,
                     mode: 0o644,
                     size: 0,
                     mtime: 791231220,
                 },
             ),
             (
                 HgPathBuf::from_bytes(b"f2"),
                 DirstateEntry {
                     state: EntryState::Merged,
                     mode: 0o777,
                     size: 1000,
                     mtime: 791231220,
                 },
             ),
             (
                 HgPathBuf::from_bytes(b"f3"),
                 DirstateEntry {
                     state: EntryState::Removed,
                     mode: 0o644,
                     size: 234553,
                     mtime: 791231220,
                 },
             ),
             (
                 HgPathBuf::from_bytes(b"f4\xF6"),
                 DirstateEntry {
                     state: EntryState::Added,
                     mode: 0o644,
                     size: -1,
                     mtime: -1,
                 },
             ),
         ]
         .iter()
         .cloned()
         .collect();
         let mut copymap = FastHashMap::default();
         copymap.insert(
             HgPathBuf::from_bytes(b"f1"),
             HgPathBuf::from_bytes(b"copyname"),
         );
         copymap.insert(
             HgPathBuf::from_bytes(b"f4\xF6"),
             HgPathBuf::from_bytes(b"copyname2"),
         );
         let parents = DirstateParents {
             p1: *b"12345678910111213141",
             p2: *b"00000000000000000000",
         };
         let now = Duration::new(15000000, 0);
         let result =
             pack_dirstate(&mut state_map, &copymap, parents.clone(), now)
                 .unwrap();
 
         let (new_parents, entries, copies) =
             parse_dirstate(result.as_slice()).unwrap();
         let new_state_map: StateMap = entries
             .into_iter()
             .map(|(path, entry)| (path.to_owned(), entry))
             .collect();
         let new_copy_map: CopyMap = copies
             .into_iter()
             .map(|(path, copy)| (path.to_owned(), copy.to_owned()))
             .collect();
 
         assert_eq!(
-            (parents, state_map, copymap),
+            (&parents, state_map, copymap),
             (new_parents, new_state_map, new_copy_map)
         )
     }
 
     #[test]
     /// https://www.mercurial-scm.org/repo/hg/rev/af3f26b6bba4
     fn test_parse_pack_one_entry_with_copy_and_time_conflict() {
         let mut state_map: StateMap = [(
             HgPathBuf::from_bytes(b"f1"),
             DirstateEntry {
                 state: EntryState::Normal,
                 mode: 0o644,
                 size: 0,
                 mtime: 15000000,
             },
         )]
         .iter()
         .cloned()
         .collect();
         let mut copymap = FastHashMap::default();
         copymap.insert(
             HgPathBuf::from_bytes(b"f1"),
             HgPathBuf::from_bytes(b"copyname"),
         );
         let parents = DirstateParents {
             p1: *b"12345678910111213141",
             p2: *b"00000000000000000000",
         };
         let now = Duration::new(15000000, 0);
         let result =
             pack_dirstate(&mut state_map, &copymap, parents.clone(), now)
                 .unwrap();
 
         let (new_parents, entries, copies) =
             parse_dirstate(result.as_slice()).unwrap();
         let new_state_map: StateMap = entries
             .into_iter()
             .map(|(path, entry)| (path.to_owned(), entry))
             .collect();
         let new_copy_map: CopyMap = copies
             .into_iter()
             .map(|(path, copy)| (path.to_owned(), copy.to_owned()))
             .collect();
 
         assert_eq!(
             (
-                parents,
+                &parents,
                 [(
                     HgPathBuf::from_bytes(b"f1"),
                     DirstateEntry {
                         state: EntryState::Normal,
                         mode: 0o644,
                         size: 0,
                         mtime: -1
                     }
                 )]
                 .iter()
                 .cloned()
                 .collect::<StateMap>(),
                 copymap,
             ),
             (new_parents, new_state_map, new_copy_map)
         )
     }
 }