qbase 0.5.0

Core structure of the QUIC protocol, a part of dquic
Documentation 
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use crate::frame::{GetFrameType, io::WriteFrameType};
/// PADDING Frame.
///
/// ```text
/// PADDING Frame {
///   Type (i) = 0x00,
/// }
/// ```
///
/// See [PADDING Frames](https://www.rfc-editor.org/rfc/rfc9000.html#name-padding-frames)
/// of [QUIC](https://www.rfc-editor.org/rfc/rfc9000.html) for more details.
#[derive(Debug, Clone, Copy, Default, PartialEq, Eq)]
pub struct PaddingFrame;

impl super::GetFrameType for PaddingFrame {
    fn frame_type(&self) -> super::FrameType {
        super::FrameType::Padding
    }
}

impl super::EncodeSize for PaddingFrame {}

/// Parse a PADDING frame from the input buffer,
/// [nom](https://docs.rs/nom/latest/nom/) parser style.
#[allow(dead_code)]
pub fn be_padding_frame(input: &[u8]) -> nom::IResult<&[u8], PaddingFrame> {
    Ok((input, PaddingFrame))
}

impl<T: bytes::BufMut> super::io::WriteFrame<PaddingFrame> for T {
    fn put_frame(&mut self, frame: &PaddingFrame) {
        self.put_frame_type(frame.frame_type());
    }
}

#[cfg(test)]
mod tests {
    use super::{PaddingFrame, be_padding_frame};
    use crate::{
        frame::{
            EncodeSize, FrameType, GetFrameType,
            io::{WriteFrame, WriteFrameType},
        },
        varint::VarInt,
    };

    #[test]
    fn test_padding_frame() {
        assert_eq!(PaddingFrame.frame_type(), FrameType::Padding);
        assert_eq!(PaddingFrame.max_encoding_size(), 1);
        assert_eq!(PaddingFrame.encoding_size(), 1);
    }

    #[test]
    fn test_read_padding_frame() {
        use nom::{Parser, combinator::flat_map};

        use crate::varint::be_varint;
        let padding_frame_type = VarInt::from(FrameType::Padding);
        let buf = vec![padding_frame_type.into_inner() as u8];
        let (input, frame) = flat_map(be_varint, |frame_type| {
            if frame_type == padding_frame_type {
                be_padding_frame
            } else {
                unreachable!("wrong frame type: {}", frame_type)
            }
        })
        .parse(buf.as_ref())
        .unwrap();
        assert!(input.is_empty());
        assert_eq!(frame, PaddingFrame);
    }

    #[test]
    fn test_write_padding_frame() {
        let mut buf = Vec::new();
        buf.put_frame(&PaddingFrame);
        let mut expected = Vec::new();
        expected.put_frame_type(FrameType::Padding);
        assert_eq!(buf, expected);
    }
}