feat: use box instead of vec

src/gz/bufread.rs

@@ -48,7 +48,7 @@ fn copy(into: &mut [u8], from: &[u8], pos: &mut usize) -> usize {
 #[derive(Debug)]
 pub struct GzEncoder<R> {
     inner: deflate::bufread::DeflateEncoder<CrcReader<R>>,
-    header: Vec<u8>,
+    header: Box<[u8]>,
     pos: usize,
     eof: bool,
 }
@@ -57,7 +57,7 @@ pub fn gz_encoder<R: BufRead>(header: Vec<u8>, r: R, lvl: Compression) -> GzEnco
     let crc = CrcReader::new(r);
     GzEncoder {
         inner: deflate::bufread::DeflateEncoder::new(crc, lvl),
-        header,
+        header: header.into_boxed_slice(),
         pos: 0,
         eof: false,
     }

src/gz/write.rs

@@ -34,14 +34,14 @@ pub struct GzEncoder<W: Write> {
     inner: zio::Writer<W, Compress>,
     crc: Crc,
     crc_bytes_written: usize,
-    header: Vec<u8>,
+    header: Box<[u8]>,
 }
 
 pub fn gz_encoder<W: Write>(header: Vec<u8>, w: W, lvl: Compression) -> GzEncoder<W> {
     GzEncoder {
         inner: zio::Writer::new(w, Compress::new(lvl, false)),
         crc: Crc::new(),
-        header,
+        header: header.into_boxed_slice(),
         crc_bytes_written: 0,
     }
 }
@@ -128,10 +128,8 @@ impl<W: Write> GzEncoder<W> {
     }
 
     fn write_header(&mut self) -> io::Result<()> {
-        while !self.header.is_empty() {
-            let n = self.inner.get_mut().write(&self.header)?;
-            self.header.drain(..n);
-        }
+        self.inner.get_mut().write_all(&self.header)?;
+        self.header = [].into();
         Ok(())
     }
 }