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