comparison rust/hg-core/src/revlog/revlog.rs @ 45534:4f11a67a12fb

hg-core: add `Revlog.get_node_rev`

Find the revision of a node given its full hash.

Differential Revision: https://phab.mercurial-scm.org/D9012

45533:89ac95bd4993

        Ok(Revlog {
            index_bytes,
            data_bytes,
        })
    }

    /// Return the full data associated to a revision.
    ///
    /// All entries required to build the final data out of deltas will be

45534:4f11a67a12fb

        Ok(Revlog {
            index_bytes,
            data_bytes,
        })
    }

    /// Return number of entries of the `Revlog`.
    pub fn len(&self) -> usize {
        self.index().len()
    }

    /// Returns `true` if the `Revlog` has zero `entries`.
    pub fn is_empty(&self) -> bool {
        self.index().is_empty()
    }

    /// Return the full data associated to a node.
    #[timed]
    pub fn get_node_rev(&self, node: &[u8]) -> Result<Revision, RevlogError> {
        let index = self.index();
        // This is brute force. But it is fast enough for now.
        // Optimization will come later.
        for rev in (0..self.len() as Revision).rev() {
            let index_entry =
                index.get_entry(rev).ok_or(RevlogError::Corrupted)?;
            if node == index_entry.hash() {
                return Ok(rev);
            }
        }
        Err(RevlogError::InvalidRevision)
    }

    /// Return the full data associated to a revision.
    ///
    /// All entries required to build the final data out of deltas will be