impl LinesCodec

fn new() -> LinesCodec

Returns a LinesCodec for splitting up data into lines.

Note

The returned LinesCodec will not have an upper bound on the length of a buffered line. See the documentation for new_with_max_length for information on why this could be a potential security risk.

fn new_with_max_length(max_length: usize) -> Self

Returns a LinesCodec with a maximum line length limit.

If this is set, calls to LinesCodec::decode will return a LinesCodecError when a line exceeds the length limit. Subsequent calls will discard up to limit bytes from that line until a newline character is reached, returning None until the line over the limit has been fully discarded. After that point, calls to decode will function as normal.

Note

Setting a length limit is highly recommended for any LinesCodec which will be exposed to untrusted input. Otherwise, the size of the buffer that holds the line currently being read is unbounded. An attacker could exploit this unbounded buffer by sending an unbounded amount of input without any \n characters, causing unbounded memory consumption.

fn max_length(&self) -> usize

Returns the maximum line length when decoding.

use std::usize;
use tokio_util::codec::LinesCodec;

let codec = LinesCodec::new();
assert_eq!(codec.max_length(), usize::MAX);

use tokio_util::codec::LinesCodec;

let codec = LinesCodec::new_with_max_length(256);
assert_eq!(codec.max_length(), 256);