use bytes::BytesMut;use memchr::memchr;#[derive(Default)]#[cfg_attr(test, derive(Debug, PartialEq, Eq))]pub(crate) struct LineBuffer {    bytes: BytesMut,    /// Prefix already scanned and known not to contain a newline.    scanned_len: usize,}impl LineBuffer {    pub(crate) fn extend_from_slice(&mut self, bytes: &[u8]) {        self.bytes.extend_from_slice(bytes);    }    pub(crate) fn take_line(&mut self) -> Option<BytesMut> {        let Some(relative_index) = memchr(b'\n', &self.bytes[self.scanned_len..]) else {            self.scanned_len = self.bytes.len();            return None;        };        let newline_index = self.scanned_len + relative_index;        let line = self.bytes.split_to(newline_index + 1);        self.scanned_len = 0;        Some(line)    }}#[cfg(test)]#[path = "line_buffer_tests.rs"]mod tests;