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use futures_lite::io::AsyncReadExt as _;
/// Reads ttyrec frames from a [`futures_lite::io::AsyncRead`] instance.
pub struct Reader<T: futures_lite::io::AsyncRead> {
input: T,
parser: crate::Parser,
buf: [u8; 4096],
}
impl<T: futures_lite::io::AsyncRead + std::marker::Unpin + Send> Reader<T> {
/// Creates a new [`Reader`](Self) from a [`futures_lite::io::AsyncRead`]
/// instance.
pub fn new(input: T) -> Self {
Self {
input,
parser: crate::Parser::new(),
buf: [0; 4096],
}
}
/// Returns the next parsed frame from the input stream.
///
/// # Errors
/// * [`Error::EOF`](crate::Error::EOF): The input stream has been closed.
/// * [`Error::Read`](crate::Error::Read): There was an error reading from
/// the input stream.
// these unwraps aren't reachable
#[allow(clippy::missing_panics_doc)]
pub async fn read_frame(&mut self) -> crate::Result<crate::Frame> {
loop {
if let Some(frame) = self.parser.next_frame() {
return Ok(frame);
}
let bytes = self
.input
.read(&mut self.buf)
.await
.map_err(|source| crate::Error::Read { source })?;
if bytes == 0 {
return Err(crate::Error::EOF);
}
self.parser.add_bytes(
// read() returning a value means that that many bytes are
// guaranteed to be available
&self.buf[..bytes],
);
}
}
/// How much the timestamps in this file should be offset by.
///
/// See [`Parser::offset`](crate::Parser::offset).
pub fn offset(&self) -> Option<std::time::Duration> {
self.parser.offset()
}
}
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