hyprwire 0.2.6

A fast and consistent wire protocol for IPC
Documentation 
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use super::{Message, MessageError, MessageType, Result};
use crate::implementation::types::MessageMagic;

#[derive(Debug)]
pub struct HandshakeAck {
    version: u32,
    data: [u8; 7],
}

impl HandshakeAck {
    pub fn new(version: u32) -> Self {
        let mut data = [0u8; 7];

        data[0] = MessageType::HandshakeAck as u8;
        data[1] = MessageMagic::TypeUint as u8;
        data[2..2 + 4].copy_from_slice(&version.to_le_bytes());
        data[6] = MessageMagic::End as u8;

        Self { version, data }
    }

    pub fn version(&self) -> u32 {
        self.version
    }

    pub fn from_bytes(data: &[u8], offset: usize) -> Result<Self> {
        if *data.get(offset).ok_or(MessageError::UnexpectedEof)? != MessageType::HandshakeAck as u8
        {
            return Err(MessageError::InvalidMessageType);
        }

        if *data.get(offset + 1).ok_or(MessageError::UnexpectedEof)? != MessageMagic::TypeUint as u8
        {
            return Err(MessageError::InvalidFieldType);
        }

        let mut needle = 2;

        if *data
            .get(offset + needle + 4)
            .ok_or(MessageError::UnexpectedEof)?
            != MessageMagic::End as u8
        {
            return Err(MessageError::MalformedMessage);
        }

        let bytes: [u8; 4] = data
            .get(offset + 2..offset + 6)
            .ok_or(MessageError::UnexpectedEof)?
            .try_into()
            .unwrap();
        let version = u32::from_le_bytes(bytes);

        needle += 4;

        Ok(Self {
            version,
            data: data[offset..=(offset + needle)].try_into().unwrap(),
        })
    }
}

impl Message for HandshakeAck {
    fn data(&self) -> &[u8] {
        &self.data
    }

    fn message_type(&self) -> MessageType {
        MessageType::HandshakeAck
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn handshake_ack_new() {
        let msg = HandshakeAck::new(1);
        let parsed = msg.parse_data();
        assert_eq!(parsed, "HandshakeAck ( 1 ) ");
    }

    #[test]
    fn handshake_ack_from_bytes() {
        let bytes: &[u8] = &[
            MessageType::HandshakeAck as u8,
            MessageMagic::TypeUint as u8,
            0x01,
            0x00,
            0x00,
            0x00,
            MessageMagic::End as u8,
        ];
        let msg = HandshakeAck::from_bytes(bytes, 0).unwrap();
        let parsed = msg.parse_data();
        assert_eq!(parsed, "HandshakeAck ( 1 ) ");
    }

    #[test]
    fn handshake_ack_from_bytes_unexpected_eof() {
        let bytes: &[u8] = &[
            MessageType::HandshakeAck as u8,
            MessageMagic::TypeUint as u8,
        ];
        let err = HandshakeAck::from_bytes(bytes, 0).unwrap_err();
        assert!(matches!(err, MessageError::UnexpectedEof));
    }

    #[test]
    fn handshake_ack_from_bytes_malformed() {
        let bytes: &[u8] = &[
            MessageType::HandshakeAck as u8,
            MessageMagic::TypeUint as u8,
            0x2A,
            0x00,
            0x00,
            0x00,
            MessageMagic::TypeUint as u8,
        ];
        let err = HandshakeAck::from_bytes(bytes, 0).unwrap_err();
        assert!(matches!(err, MessageError::MalformedMessage));
    }
}