telnet 0.2.5

A simple implementation of telnet protocol.
Documentation 
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use crate::{stream::Stream, zcstream::ZCStream};
use flate2::read::ZlibDecoder;
use std::{
    io::{Read, Result, Write},
    time::Duration,
};

enum ZlibStreamSwitch<T> {
    Plain(T),
    Encoded(ZlibDecoder<T>),
}

/// A wrapper which can enable and disable zlib decompression for downstream at runtime.
///
/// # Examples
///
/// ```ignore
/// let mut stream = ZlibStream::from_stream(old_stream);
/// stream.begin_zlib();
/// ```
pub struct ZlibStream<T> {
    stream: ZlibStreamSwitch<T>,
}

impl<T> ZlibStream<T>
where
    T: Read,
{
    pub fn from_stream(stream: T) -> Self {
        ZlibStream::<T> {
            stream: ZlibStreamSwitch::Plain(stream),
        }
    }
}

impl<T> Read for ZlibStream<T>
where
    T: Read,
{
    fn read(&mut self, buf: &mut [u8]) -> Result<usize> {
        match self.stream {
            ZlibStreamSwitch::Plain(ref mut stream) => stream.read(buf),
            ZlibStreamSwitch::Encoded(ref mut stream) => stream.read(buf),
        }
    }
}

impl<T> Write for ZlibStream<T>
where
    T: Write,
{
    fn write(&mut self, buf: &[u8]) -> Result<usize> {
        match self.stream {
            ZlibStreamSwitch::Plain(ref mut stream) => stream.write(buf),
            ZlibStreamSwitch::Encoded(ref mut stream) => stream.get_mut().write(buf),
        }
    }
    fn flush(&mut self) -> Result<()> {
        match self.stream {
            ZlibStreamSwitch::Plain(ref mut stream) => stream.flush(),
            ZlibStreamSwitch::Encoded(ref mut stream) => stream.get_mut().flush(),
        }
    }
}

impl<T> Stream for ZlibStream<T>
where
    T: Stream,
{
    fn set_nonblocking(&self, nonblocking: bool) -> Result<()> {
        match self.stream {
            ZlibStreamSwitch::Plain(ref stream) => stream.set_nonblocking(nonblocking),
            ZlibStreamSwitch::Encoded(ref stream) => stream.get_ref().set_nonblocking(nonblocking),
        }
    }

    fn set_read_timeout(&self, dur: Option<Duration>) -> Result<()> {
        match self.stream {
            ZlibStreamSwitch::Plain(ref stream) => stream.set_read_timeout(dur),
            ZlibStreamSwitch::Encoded(ref stream) => stream.get_ref().set_read_timeout(dur),
        }
    }
}

impl<T> ZCStream for ZlibStream<T>
where
    T: Stream,
{
    fn begin_zlib(&mut self) {
        replace_with::replace_with_or_abort(&mut self.stream, |stream| {
            if let ZlibStreamSwitch::Plain(stream) = stream {
                ZlibStreamSwitch::Encoded(ZlibDecoder::new(stream))
            } else {
                stream
            }
        });
    }
    fn end_zlib(&mut self) {
        replace_with::replace_with_or_abort(&mut self.stream, |stream| {
            if let ZlibStreamSwitch::Encoded(stream) = stream {
                ZlibStreamSwitch::Plain(stream.into_inner())
            } else {
                stream
            }
        });
    }
}