use std::io; use git_object::WriteTo; /// Describe the capability to write git objects into an object store.pub trait Write {    /// The error type used for all trait methods.    ///    /// _Note_ the default implementations require the `From<io::Error>` bound.    type Error: std::error::Error + From<io::Error>;     /// Write objects using the given kind of [`hash`][git_hash::Kind] into the database,    /// returning id to reference it in subsequent reads.    fn write(&self, object: impl WriteTo, hash: git_hash::Kind) -> Result<git_hash::ObjectId, Self::Error> {        let mut buf = Vec::with_capacity(2048);        object.write_to(&mut buf)?;        self.write_stream(object.kind(), buf.len() as u64, buf.as_slice(), hash)    }    /// As [`write`][Write::write], but takes an [`object` kind][git_object::Kind] along with its encoded bytes.    fn write_buf(        &self,        object: git_object::Kind,        from: &[u8],        hash: git_hash::Kind,    ) -> Result<git_hash::ObjectId, Self::Error> {        self.write_stream(object, from.len() as u64, from, hash)    }    /// As [`write`][Write::write], but takes an input stream.    /// This is commonly used for writing blobs directly without reading them to memory first.    fn write_stream(        &self,        kind: git_object::Kind,        size: u64,        from: impl io::Read,        hash: git_hash::Kind,    ) -> Result<git_hash::ObjectId, Self::Error>;}