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use std::io::Write;
pub struct HeaderLines<W: Write>(W);
impl<W: Write> HeaderLines<W> {
pub fn new(sink: W) -> Self {
HeaderLines(sink)
}
pub fn line(&mut self) -> HeaderLine<&mut W> {
HeaderLine(&mut self.0)
}
}
impl<W: Write> Drop for HeaderLines<W> {
fn drop(&mut self) {
self.line();
self.0.flush().is_ok();
}
}
pub struct HeaderLine<W: Write>(W);
impl<W: Write> Write for HeaderLine<W> {
fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> { self.0.write(buf) }
fn flush(&mut self) -> std::io::Result<()> { self.0.flush() }
}
impl<W: Write> Drop for HeaderLine<W> {
fn drop(&mut self) { self.write(&b"\r\n"[..]).is_ok(); }
}
#[cfg(test)]
mod test {
use super::*;
use std::io::Cursor;
#[test]
fn test_header_line() {
let mut buf = [0u8; 13];
{
let mut c = Cursor::new(&mut buf[..]);
let mut h = HeaderLine(&mut c);
write!(&mut h, "ABC: DEF").unwrap();
write!(&mut h, " {}", 42).unwrap();
}
assert_eq!(&buf[..], b"ABC: DEF 42\r\n");
}
#[test]
fn test_header_lines() {
let mut buf = [0u8; 30];
{
let mut c = Cursor::new(&mut buf[..]);
let mut h = HeaderLines::new(&mut c);
write!(h.line(), "header: value").unwrap();
write!(h.line(), "field: {}", 1337).unwrap();
}
assert_eq!(&buf[..], b"header: value\r\nfield: 1337\r\n\r\n");
}
}