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use snafu::ResultExt as _;
/// Reads ttyrec frames from a `tokio::io::AsyncRead` instance.
pub struct Reader<R> {
reader: R,
parser: crate::parser::Parser,
read_buf: [u8; 4096],
done_reading: bool,
}
impl<R: tokio::io::AsyncRead> Reader<R> {
/// Creates a new `Reader` from a `tokio::io::AsyncRead` instance.
pub fn new(reader: R) -> Self {
Self {
reader,
parser: crate::parser::Parser::new(),
read_buf: [0; 4096],
done_reading: false,
}
}
/// Polls to see if a new frame can be read.
///
/// Returns `Ok(Async::Ready(Some(frame)))` if a frame is available,
/// `Ok(Async::Ready(None))` if the underlying reader is done, and
/// `Ok(Async::NotReady)` if not enough bytes have been read for a full
/// frame.
pub fn poll_read(
&mut self,
) -> futures::Poll<Option<crate::frame::Frame>, crate::error::Error> {
loop {
if let Some(frame) = self.parser.next_frame() {
return Ok(futures::Async::Ready(Some(frame)));
} else if self.done_reading {
return Ok(futures::Async::Ready(None));
}
let n = futures::try_ready!(self
.reader
.poll_read(&mut self.read_buf)
.context(crate::error::ReadFile));
if n > 0 {
self.parser.add_bytes(&self.read_buf[..n]);
} else {
self.done_reading = true;
}
}
}
}
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