refactor(headers): Use macros for headers where possible

src/header/common/content_length.rs

@@ -1,31 +1,11 @@
-use std::fmt;
-
-use header::{Header, HeaderFormat};
-use header::parsing::from_one_raw_str;
-
 /// The `Content-Length` header.
 ///
-/// Simply a wrapper around a `usize`.
+/// Simply a wrapper around a `u64`.
 #[derive(Copy, Clone, PartialEq, Debug)]
 pub struct ContentLength(pub u64);
 
-deref!(ContentLength => u64);
-
-impl Header for ContentLength {
-    fn header_name() -> &'static str {
-        "Content-Length"
-    }
-
-    fn parse_header(raw: &[Vec<u8>]) -> Option<ContentLength> {
-        from_one_raw_str(raw).map(|u| ContentLength(u))
-    }
-}
-
-impl HeaderFormat for ContentLength {
-    fn fmt_header(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
-       fmt::Display::fmt(&self.0, fmt)
-    }
-}
+impl_header!(ContentLength,
+             "Content-Length",
+             u64);
 
 bench_header!(bench, ContentLength, { vec![b"42349984".to_vec()] });
-