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use std::{
cell::RefCell,
convert::TryInto,
io::{self, Write},
};
use gix_features::zlib::stream::deflate;
use crate::Sink;
impl Sink {
/// Enable or disable compression. Compression is disabled by default
pub fn compress(mut self, enable: bool) -> Self {
if enable {
self.compressor = Some(RefCell::new(deflate::Write::new(io::sink())));
} else {
self.compressor = None;
}
self
}
}
impl crate::traits::Write for Sink {
fn write_stream(
&self,
kind: gix_object::Kind,
size: u64,
from: &mut dyn io::Read,
) -> Result<gix_hash::ObjectId, crate::write::Error> {
let mut size = size.try_into().expect("object size to fit into usize");
let mut buf = [0u8; 8096];
let header = gix_object::encode::loose_header(kind, size);
let possibly_compress = |buf: &[u8]| -> io::Result<()> {
if let Some(compressor) = self.compressor.as_ref() {
compressor.try_borrow_mut().expect("no recursion").write_all(buf)?;
}
Ok(())
};
let mut hasher = gix_features::hash::hasher(self.object_hash);
hasher.update(&header);
possibly_compress(&header).map_err(Box::new)?;
while size != 0 {
let bytes = size.min(buf.len());
from.read_exact(&mut buf[..bytes]).map_err(Box::new)?;
hasher.update(&buf[..bytes]);
possibly_compress(&buf[..bytes]).map_err(Box::new)?;
size -= bytes;
}
if let Some(compressor) = self.compressor.as_ref() {
let mut c = compressor.borrow_mut();
c.flush().map_err(Box::new)?;
c.reset();
}
Ok(hasher.digest().into())
}
}
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