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use std::fmt;
use header::{HeaderFormat, Header, parsing};
/// `Content-Length` header, defined in
/// [RFC7230](http://tools.ietf.org/html/rfc7230#section-3.3.2)
///
/// When a message does not have a `Transfer-Encoding` header field, a
/// Content-Length header field can provide the anticipated size, as a
/// decimal number of octets, for a potential payload body. For messages
/// that do include a payload body, the Content-Length field-value
/// provides the framing information necessary for determining where the
/// body (and message) ends. For messages that do not include a payload
/// body, the Content-Length indicates the size of the selected
/// representation.
///
/// # ABNF
/// ```plain
/// Content-Length = 1*DIGIT
/// ```
///
/// # Example values
/// * `3495`
///
/// # Example
/// ```
/// use hyper::header::{Headers, ContentLength};
///
/// let mut headers = Headers::new();
/// headers.set(ContentLength(1024u64));
/// ```
#[derive(Clone, Copy, Debug, PartialEq)]
pub struct ContentLength(pub u64);
impl Header for ContentLength {
#[inline]
fn header_name() -> &'static str {
"Content-Length"
}
fn parse_header(raw: &[Vec<u8>]) -> ::Result<ContentLength> {
// If multiple Content-Length headers were sent, everything can still
// be alright if they all contain the same value, and all parse
// correctly. If not, then it's an error.
raw.iter()
.map(::std::ops::Deref::deref)
.map(parsing::from_raw_str)
.fold(None, |prev, x| {
match (prev, x) {
(None, x) => Some(x),
(e@Some(Err(_)), _ ) => e,
(Some(Ok(prev)), Ok(x)) if prev == x => Some(Ok(prev)),
_ => Some(Err(::Error::Header))
}
})
.unwrap_or(Err(::Error::Header))
.map(ContentLength)
}
}
impl HeaderFormat for ContentLength {
#[inline]
fn fmt_header(&self, f: &mut fmt::Formatter) -> fmt::Result {
fmt::Display::fmt(&self.0, f)
}
}
impl fmt::Display for ContentLength {
#[inline]
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
fmt::Display::fmt(&self.0, f)
}
}
__hyper__deref!(ContentLength => u64);
__hyper_generate_header_serialization!(ContentLength);
__hyper__tm!(ContentLength, tests {
// Testcase from RFC
test_header!(test1, vec![b"3495"], Some(HeaderField(3495)));
test_header!(test_invalid, vec![b"34v95"], None);
// Can't use the test_header macro because "5, 5" gets cleaned to "5".
#[test]
fn test_duplicates() {
let parsed = HeaderField::parse_header(&[b"5"[..].into(),
b"5"[..].into()]).unwrap();
assert_eq!(parsed, HeaderField(5));
assert_eq!(format!("{}", parsed), "5");
}
test_header!(test_duplicates_vary, vec![b"5", b"6", b"5"], None);
});
bench_header!(bench, ContentLength, { vec![b"42349984".to_vec()] });