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//! Multiplier Information Element
//!
//! The Multiplier IE is used in Usage Reporting Rules to specify a factor
//! for multiplying usage quota values.
//! Per 3GPP TS 29.244 Section 8.2.84.
use crate::error::PfcpError;
use crate::ie::{Ie, IeType};
/// Multiplier
///
/// Represents a quotient multiplier for usage quota calculation.
/// Encoded as an unsigned 32-bit integer representing a factor
/// used in usage reporting quota calculations.
///
/// # 3GPP Reference
/// 3GPP TS 29.244 Section 8.2.84
///
/// # Structure
/// - 4 bytes: Multiplier value (u32, big-endian)
///
/// # Examples
///
/// ```
/// use rs_pfcp::ie::multiplier::Multiplier;
///
/// // Create a multiplier with value 100
/// let multiplier = Multiplier::new(100);
/// assert_eq!(multiplier.value(), 100);
///
/// // Marshal and unmarshal
/// let bytes = multiplier.marshal();
/// let parsed = Multiplier::unmarshal(&bytes)?;
/// assert_eq!(multiplier, parsed);
/// # Ok::<(), rs_pfcp::error::PfcpError>(())
/// ```
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct Multiplier {
/// Multiplier quotient value
value: u32,
}
impl Multiplier {
/// Create a new Multiplier
///
/// # Arguments
/// * `value` - Multiplier quotient value (0 to u32::MAX)
///
/// # Example
/// ```
/// use rs_pfcp::ie::multiplier::Multiplier;
///
/// let multiplier = Multiplier::new(50);
/// assert_eq!(multiplier.value(), 50);
/// ```
pub fn new(value: u32) -> Self {
Multiplier { value }
}
/// Get the multiplier value
///
/// # Example
/// ```
/// use rs_pfcp::ie::multiplier::Multiplier;
///
/// let multiplier = Multiplier::new(200);
/// assert_eq!(multiplier.value(), 200);
/// ```
pub fn value(&self) -> u32 {
self.value
}
/// Marshal Multiplier to bytes
///
/// # Returns
/// 4-byte vector containing multiplier value (big-endian)
pub fn marshal(&self) -> Vec<u8> {
self.value.to_be_bytes().to_vec()
}
/// Unmarshal Multiplier from bytes
///
/// # Arguments
/// * `data` - Byte slice containing multiplier data (must be at least 4 bytes)
///
/// # Errors
/// Returns error if data is too short
///
/// # Example
/// ```
/// use rs_pfcp::ie::multiplier::Multiplier;
///
/// let multiplier = Multiplier::new(75000);
/// let bytes = multiplier.marshal();
/// let parsed = Multiplier::unmarshal(&bytes)?;
/// assert_eq!(multiplier, parsed);
/// # Ok::<(), rs_pfcp::error::PfcpError>(())
/// ```
pub fn unmarshal(data: &[u8]) -> Result<Self, PfcpError> {
if data.len() < 4 {
return Err(PfcpError::invalid_length(
"Multiplier",
IeType::Multiplier,
4,
data.len(),
));
}
let bytes: [u8; 4] = data[0..4].try_into().unwrap();
let value = u32::from_be_bytes(bytes);
Ok(Multiplier { value })
}
/// Convert to generic IE
///
/// # Example
/// ```
/// use rs_pfcp::ie::multiplier::Multiplier;
/// use rs_pfcp::ie::IeType;
///
/// let multiplier = Multiplier::new(100);
/// let ie = multiplier.to_ie();
/// assert_eq!(ie.ie_type, IeType::Multiplier);
/// ```
pub fn to_ie(&self) -> Ie {
Ie::new(IeType::Multiplier, self.marshal())
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_multiplier_new() {
let multiplier = Multiplier::new(100);
assert_eq!(multiplier.value(), 100);
}
#[test]
fn test_multiplier_marshal_unmarshal() {
let original = Multiplier::new(5000);
let bytes = original.marshal();
assert_eq!(bytes.len(), 4);
let parsed = Multiplier::unmarshal(&bytes).unwrap();
assert_eq!(original, parsed);
assert_eq!(parsed.value(), 5000);
}
#[test]
fn test_multiplier_marshal_zero() {
let multiplier = Multiplier::new(0);
let bytes = multiplier.marshal();
let parsed = Multiplier::unmarshal(&bytes).unwrap();
assert_eq!(multiplier, parsed);
assert_eq!(parsed.value(), 0);
}
#[test]
fn test_multiplier_marshal_max_value() {
let multiplier = Multiplier::new(u32::MAX);
let bytes = multiplier.marshal();
let parsed = Multiplier::unmarshal(&bytes).unwrap();
assert_eq!(multiplier, parsed);
assert_eq!(parsed.value(), u32::MAX);
}
#[test]
fn test_multiplier_unmarshal_short() {
let data = vec![0x00, 0x00, 0x00]; // Only 3 bytes
let result = Multiplier::unmarshal(&data);
assert!(result.is_err());
let err = result.unwrap_err();
assert!(matches!(err, PfcpError::InvalidLength { .. }));
}
#[test]
fn test_multiplier_unmarshal_empty() {
let data = vec![];
let result = Multiplier::unmarshal(&data);
assert!(result.is_err());
let err = result.unwrap_err();
assert!(matches!(err, PfcpError::InvalidLength { .. }));
}
#[test]
fn test_multiplier_to_ie() {
let multiplier = Multiplier::new(250);
let ie = multiplier.to_ie();
assert_eq!(ie.ie_type, IeType::Multiplier);
assert_eq!(ie.payload.len(), 4);
// Verify IE can be unmarshaled
let parsed = Multiplier::unmarshal(&ie.payload).unwrap();
assert_eq!(multiplier, parsed);
}
#[test]
fn test_multiplier_round_trip_various() {
let values = vec![1, 10, 100, 1000, 10000, 100000, 1000000, u32::MAX / 2];
for value in values {
let original = Multiplier::new(value);
let bytes = original.marshal();
let parsed = Multiplier::unmarshal(&bytes).unwrap();
assert_eq!(original, parsed, "Failed for value {}", value);
}
}
#[test]
fn test_multiplier_byte_order() {
// Verify big-endian encoding
let multiplier = Multiplier::new(0x12345678);
let bytes = multiplier.marshal();
assert_eq!(bytes, vec![0x12, 0x34, 0x56, 0x78]);
}
#[test]
fn test_multiplier_clone() {
let multiplier1 = Multiplier::new(5000);
let multiplier2 = multiplier1;
assert_eq!(multiplier1, multiplier2);
}
#[test]
fn test_multiplier_5g_usage_reporting() {
// Scenario: Apply multiplier to usage quota
let multiplier = Multiplier::new(1000);
let bytes = multiplier.marshal();
let parsed = Multiplier::unmarshal(&bytes).unwrap();
assert_eq!(parsed.value(), 1000);
assert_eq!(multiplier, parsed);
}
#[test]
fn test_multiplier_real_world_factors() {
// Test common multiplier values used in telecom
let test_values = vec![
(1, "no multiplier"),
(10, "10x multiplier"),
(100, "100x multiplier"),
(1000, "1000x multiplier"),
];
for (value, _desc) in test_values {
let multiplier = Multiplier::new(value);
let bytes = multiplier.marshal();
let parsed = Multiplier::unmarshal(&bytes).unwrap();
assert_eq!(parsed.value(), value);
}
}
}