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|
use std::io;
use super::*;
/// Changes the cookie type without introducing any buffering.
///
/// If you have a `b: BufferedReader<B>` but need a `c:
/// BufferedReader<C>`, then one way to do that is to use `let c =
/// Generic::with_cookie(b, _)`, but that introduces buffering. This
/// `Adapter` also changes cookie types, but does no buffering of its
/// own.
#[derive(Debug)]
pub struct Adapter<T: BufferedReader<B>, B: fmt::Debug + Send + Sync, C: fmt::Debug + Sync + Send> {
reader: T,
_ghostly_cookie: std::marker::PhantomData<B>,
cookie: C,
}
assert_send_and_sync!(Adapter<T, B, C>
where T: BufferedReader<B>,
B: fmt::Debug,
C: fmt::Debug);
impl<T: BufferedReader<B>, B: fmt::Debug + Send + Sync, C: fmt::Debug + Sync + Send> fmt::Display for Adapter<T, B, C> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.debug_struct("Adapter").finish()
}
}
impl<T: BufferedReader<B>, B: fmt::Debug + Sync + Send> Adapter<T, B, ()> {
/// Instantiates a new adapter.
///
/// `reader` is the source to wrap.
pub fn new(reader: T) -> Self {
Self::with_cookie(reader, ())
}
}
impl<T: BufferedReader<B>, B: fmt::Debug + Send + Sync, C: fmt::Debug + Sync + Send> Adapter<T, B, C> {
/// Like `new()`, but sets a cookie.
///
/// The cookie can be retrieved using the `cookie_ref` and
/// `cookie_mut` methods, and set using the `cookie_set` method.
pub fn with_cookie(reader: T, cookie: C)
-> Adapter<T, B, C> {
Adapter {
reader,
_ghostly_cookie: Default::default(),
cookie,
}
}
}
impl<T: BufferedReader<B>, B: fmt::Debug + Send + Sync, C: fmt::Debug + Sync + Send> io::Read for Adapter<T, B, C> {
fn read(&mut self, buf: &mut [u8]) -> Result<usize, io::Error> {
self.reader.read(buf)
}
}
impl<T: BufferedReader<B>, B: fmt::Debug + Send + Sync, C: fmt::Debug + Sync + Send> BufferedReader<C> for Adapter<T, B, C> {
fn buffer(&self) -> &[u8] {
self.reader.buffer()
}
fn data(&mut self, amount: usize) -> Result<&[u8], io::Error> {
self.reader.data(amount)
}
fn consume(&mut self, amount: usize) -> &[u8] {
self.reader.consume(amount)
}
fn data_consume(&mut self, amount: usize) -> Result<&[u8], io::Error> {
self.reader.data_consume(amount)
}
fn data_consume_hard(&mut self, amount: usize) -> Result<&[u8], io::Error> {
self.reader.data_consume_hard(amount)
}
fn consummated(&mut self) -> bool {
self.reader.consummated()
}
fn get_mut(&mut self) -> Option<&mut dyn BufferedReader<C>> {
None
}
fn get_ref(&self) -> Option<&dyn BufferedReader<C>> {
None
}
fn into_inner<'b>(self: Box<Self>) -> Option<Box<dyn BufferedReader<C> + 'b>>
where Self: 'b {
None
}
fn cookie_set(&mut self, cookie: C) -> C {
std::mem::replace(&mut self.cookie, cookie)
}
fn cookie_ref(&self) -> &C {
&self.cookie
}
fn cookie_mut(&mut self) -> &mut C {
&mut self.cookie
}
}
|
