rust/hg-core/src/revlog/revlog.rs

48539:b9d5ad7146a3

            .index
            .get_entry(rev)
            .ok_or(RevlogError::InvalidRevision)?;

        let data: Vec<u8> = if delta_chain.is_empty() {
            entry.data()?.into()
        } else {
            Revlog::build_data_from_deltas(entry, &delta_chain)?
        };

        if self.check_hash(

    #[timed]
    fn build_data_from_deltas(
        snapshot: RevlogEntry,
        deltas: &[RevlogEntry],
    ) -> Result<Vec<u8>, RevlogError> {
        let snapshot = snapshot.data()?;
        let deltas = deltas
            .iter()
            .rev()
            .map(RevlogEntry::data)
            .collect::<Result<Vec<Cow<'_, [u8]>>, RevlogError>>()?;
        let patches: Vec<_> =
            deltas.iter().map(|d| patch::PatchList::new(d)).collect();
        let patch = patch::fold_patch_lists(&patches);
        Ok(patch.apply(&snapshot))

    pub fn revision(&self) -> Revision {
        self.rev
    }

    /// Extract the data contained in the entry.
    pub fn data(&self) -> Result<Cow<'_, [u8]>, RevlogError> {
        if self.bytes.is_empty() {
            return Ok(Cow::Borrowed(&[]));
        }
        match self.bytes[0] {
            // Revision data is the entirety of the entry, including this

48540:20d0d896183e

            .index
            .get_entry(rev)
            .ok_or(RevlogError::InvalidRevision)?;

        let data: Vec<u8> = if delta_chain.is_empty() {
            entry.data_chunk()?.into()
        } else {
            Revlog::build_data_from_deltas(entry, &delta_chain)?
        };

        if self.check_hash(

    #[timed]
    fn build_data_from_deltas(
        snapshot: RevlogEntry,
        deltas: &[RevlogEntry],
    ) -> Result<Vec<u8>, RevlogError> {
        let snapshot = snapshot.data_chunk()?;
        let deltas = deltas
            .iter()
            .rev()
            .map(RevlogEntry::data_chunk)
            .collect::<Result<Vec<Cow<'_, [u8]>>, RevlogError>>()?;
        let patches: Vec<_> =
            deltas.iter().map(|d| patch::PatchList::new(d)).collect();
        let patch = patch::fold_patch_lists(&patches);
        Ok(patch.apply(&snapshot))

    pub fn revision(&self) -> Revision {
        self.rev
    }

    /// Extract the data contained in the entry.
    /// This may be a delta. (See `is_delta`.)
    fn data_chunk(&self) -> Result<Cow<'_, [u8]>, RevlogError> {
        if self.bytes.is_empty() {
            return Ok(Cow::Borrowed(&[]));
        }
        match self.bytes[0] {
            // Revision data is the entirety of the entry, including this