Enum ObjectHasher 

pub enum ObjectHasher {
    Sha1(Hasher),
    Sha256(Sha256),
}

Incremental hasher for Git’s supported object-id algorithms.

Variants

Sha1(Hasher)

SHA-1 (20-byte digests) with sha1dc collision detection.

Sha256(Sha256)

SHA-256 (32-byte digests).

Implementations

impl ObjectHasher

pub fn new(algo: HashAlgo) -> Self

Create a fresh hasher for algo.

pub fn algo(self: &ObjectHasher) -> HashAlgo

The hash algorithm this hasher produces.

pub fn update(&mut self, data: &[u8])

Feed more bytes into the digest.

pub fn for_object(algo: HashAlgo, kind: ObjectKind, len: u64) -> Self

Create a hasher that already consumed the Git object header for kind and len.

The header is written into a stack buffer (no heap allocation).

pub fn finalize(self) -> Result<ObjectId>

Finish hashing and return the object id.

Errors

Returns Error::HashCollision when sha1dc detects a chosen-prefix collision.

pub fn finalize_into(self, out: &mut [u8]) -> Result<usize>

Write the raw digest into out and return the number of bytes written.

Errors

Returns Error::InvalidObjectId when out is shorter than the digest length for this algorithm (a diagnostic string names the required size).

Trait Implementations

impl Clone for ObjectHasher

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ObjectHasher

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Write for ObjectHasher

fn write(&mut self, buf: &[u8]) -> Result<usize>

Writes a buffer into this writer, returning how many bytes were written.

fn flush(&mut self) -> Result<()>

Flushes this output stream, ensuring that all intermediately buffered contents reach their destination.

fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> Result<usize, Error>

Like write, except that it writes from a slice of buffers.

fn is_write_vectored(&self) -> bool

🔬This is a nightly-only experimental API. (can_vector)

Determines if this Writer has an efficient write_vectored implementation.

fn write_all(&mut self, buf: &[u8]) -> Result<(), Error>

Attempts to write an entire buffer into this writer.

fn write_all_vectored(&mut self, bufs: &mut [IoSlice<'_>]) -> Result<(), Error>

🔬This is a nightly-only experimental API. (write_all_vectored)

Attempts to write multiple buffers into this writer.

fn write_fmt(&mut self, args: Arguments<'_>) -> Result<(), Error>

Writes a formatted string into this writer, returning any error encountered.

fn by_ref(&mut self) -> &mut Self

where Self: Sized,

Creates a “by reference” adapter for this instance of Write.