fixed deflate and packbits

src/encoder/compression/deflate.rs

@@ -53,7 +53,7 @@ impl Compression for Deflate {
 impl CompressionAlgorithm for Deflate {
     fn write_to<W: Write>(&mut self, writer: &mut W, bytes: &[u8]) -> Result<u64, io::Error> {
         let mut encoder = ZlibEncoder::new(writer, self.level);
-        encoder.write(&bytes)?;
+        encoder.write_all(&bytes)?;
         encoder.try_finish()?;
         Ok(encoder.total_out())
     }

src/encoder/compression/packbits.rs

@@ -122,6 +122,7 @@ impl CompressionAlgorithm for Packbits {
             bufwriter.write(&bytes[pending_index..pending_index + bytes_pending as usize])?;
         }
 
+        bufwriter.flush()?;
         Ok(bytes_written)
     }
 }