async fn generate_git_oid_from_async_buffer<R>(
        mut digest: Box<dyn DynDigest>,
        mut reader: R,
        expected_length: usize,
    ) -> IOResult<(usize, [u8; NUM_HASH_BYTES])>
    where
        R: AsyncReadExt + std::marker::Unpin,
    {
        let prefix = format!("blob {}\0", expected_length);

        let mut buf = [0u8; 8192]; // the size of a buffer for buffered read
        let mut amount_read: usize = 0;

        // set the prefix
        digest.update(prefix.as_bytes());

        // keep reading the input until there is no more
        loop {
            match reader.read(&mut buf).await? {
                // done
                0 => break,

                // update the hash and accumulate the count
                size => {
                    digest.update(&buf[..size]);
                    amount_read = amount_read + size;
                }
            }
        }

        // make sure we got the length we expected
        if amount_read != expected_length {
            return Err(Error::new(
                ErrorKind::InvalidInput,
                format!(
                    "Expected length {} actual length {}",
                    expected_length, amount_read
                ),
            ));
        }

        let hash = digest.finalize();
        let mut ret = [0u8; NUM_HASH_BYTES];

        let len = NUM_HASH_BYTES.min(hash.len());
        ret[..len].copy_from_slice(&hash);
        return Ok((len, ret));
    }
/// the async version of generating a git_oid from a buffer
the async version of generating a git_oid from a buffer
the async version of generating a git_oid from a buffer
async fn generate_git_oid_from_async_buffer<R>(
        mut digest: Box<dyn DynDigest>,
        mut reader: R,
        expected_length: usize,
    ) -> IOResult<(usize, [u8; NUM_HASH_BYTES])>
    where
        R: AsyncReadExt + std::marker::Unpin,
    {
        let prefix = format!("blob {}\0", expected_length);
        let mut buf = [0u8; 8192]; // the size of a buffer for buffered read
        let mut amount_read: usize = 0;
        // set the prefix
        digest.update(prefix.as_bytes());
        // keep reading the input until there is no more
        loop {
            match reader.read(&mut buf).await? {
                // done
                0 => break,
                // update the hash and accumulate the count
                size => {
                    digest.update(&buf[..size]);
                    amount_read = amount_read + size;
                }
            }
        }
        // make sure we got the length we expected
        if amount_read != expected_length {
            return Err(Error::new(
                ErrorKind::InvalidInput,
                format!(
                    "Expected length {} actual length {}",
                    expected_length, amount_read
                ),
            ));
        }
        let hash = digest.finalize();
        let mut ret = [0u8; NUM_HASH_BYTES];
        let len = NUM_HASH_BYTES.min(hash.len());
        ret[..len].copy_from_slice(&hash);
        return Ok((len, ret));
    }
async fn generate_git_oid_from_async_buffer < R > ( mut digest : Box < dyn DynDigest > , mut reader : R , expected_length : usize , ) -> IOResult < ( usize , [ u8 ; NUM_HASH_BYTES ] ) > where R : AsyncReadExt + std :: marker :: Unpin , { let prefix = format ! ( " \0 " expected_length ) ; let mut buf = [ 0u8 ; 8192 ] ; // the size of a buffer for buffered read let mut amount_read : usize = 0 ; // set the prefix digest . update ( prefix . as_bytes ( ) ) ; // keep reading the input until there is no more loop { match reader . read ( & mut buf ) . await ? { // done 0 => break , // update the hash and accumulate the count size => { digest . update ( & buf [ .. size ] ) ; amount_read = amount_read + size ; } } } // make sure we got the length we expected if amount_read != expected_length { return Err ( Error :: new ( ErrorKind :: InvalidInput , format ! ( " " expected_length amount_read ) , ) ) ; } let hash = digest . finalize ( ) ; let mut ret = [ 0u8 ; NUM_HASH_BYTES ] ; let len = NUM_HASH_BYTES . min ( hash . len ( ) ) ; ret [ .. len ] . copy_from_slice ( & hash ) ; return Ok ( ( len , ret ) ) ; }
the async version of generating a git_oid from a buffer
the async version of generating a git_oid from a buffer
digest
Box<dyn DynDigest>
reader
R
expected_length
usize
digest
Box<dyn DynDigest>
reader
R
expected_length
usize