rs-pfcp 0.4.0

High-performance Rust implementation of PFCP (Packet Forwarding Control Protocol) for 5G networks with 100% 3GPP TS 29.244 Release 18 compliance
Documentation 
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// src/ie/timer.rs

//! Timer Information Element.

use crate::error::PfcpError;
use crate::ie::IeType;

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct Timer {
    pub value: u32,
}

impl Timer {
    pub fn new(value: u32) -> Self {
        Timer { value }
    }

    pub fn marshal(&self) -> [u8; 4] {
        self.value.to_be_bytes()
    }

    /// Unmarshals a byte slice into a Timer.
    ///
    /// Per 3GPP TS 29.244, Timer requires exactly 4 bytes (u32).
    pub fn unmarshal(data: &[u8]) -> Result<Self, PfcpError> {
        if data.len() < 4 {
            return Err(PfcpError::invalid_length(
                "Timer",
                IeType::Timer,
                4,
                data.len(),
            ));
        }
        Ok(Timer {
            value: u32::from_be_bytes(data[0..4].try_into().unwrap()),
        })
    }
}

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

    #[test]
    fn test_timer_marshal_unmarshal() {
        let timer = Timer::new(3600);
        let marshaled = timer.marshal();
        let unmarshaled = Timer::unmarshal(&marshaled).unwrap();
        assert_eq!(unmarshaled, timer);
    }

    #[test]
    fn test_timer_unmarshal_invalid_data() {
        let data = [0; 3];
        let result = Timer::unmarshal(&data);
        assert!(result.is_err());
        let err = result.unwrap_err();
        assert!(matches!(err, PfcpError::InvalidLength { .. }));
        if let PfcpError::InvalidLength {
            ie_name,
            ie_type,
            expected,
            actual,
        } = err
        {
            assert_eq!(ie_name, "Timer");
            assert_eq!(ie_type, IeType::Timer);
            assert_eq!(expected, 4);
            assert_eq!(actual, 3);
        }
    }

    #[test]
    fn test_timer_unmarshal_empty() {
        let result = Timer::unmarshal(&[]);
        assert!(result.is_err());
        let err = result.unwrap_err();
        assert!(matches!(err, PfcpError::InvalidLength { .. }));
        if let PfcpError::InvalidLength {
            ie_name,
            ie_type,
            expected,
            actual,
        } = err
        {
            assert_eq!(ie_name, "Timer");
            assert_eq!(ie_type, IeType::Timer);
            assert_eq!(expected, 4);
            assert_eq!(actual, 0);
        }
    }

    #[test]
    fn test_timer_round_trip() {
        let test_values = vec![0, 1, 60, 3600, 86400, 0xFFFFFFFF];
        for value in test_values {
            let timer = Timer::new(value);
            let marshaled = timer.marshal();
            let unmarshaled = Timer::unmarshal(&marshaled).unwrap();
            assert_eq!(unmarshaled.value, value);
        }
    }
}