Enum ExtensionHeader 

#[non_exhaustive]
pub enum ExtensionHeader {
    Optional {
        h_len: u8,
        h_type: u8,
        body: Vec<u8>,
    },
    Mandatory {
        h_type: u8,
        body: Vec<u8>,
    },
}

A single ULE extension header in a chain (RFC 4326 §5).

Each variant carries the H-Type/H-LEN implicitly; the body bytes that follow the introducing Type field are stored typed where the spec defines a layout, else as opaque bytes for forward compatibility.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Optional

Optional header (H-LEN = 1..=5), opaque body of 2 * h_len - 2 bytes.

Covers TimeStamp, Extension-Padding and any unrecognised optional header: the body is preserved verbatim so the chain round-trips.

Fields

h_len: u8

3-bit length selector (1..=5).

h_type: u8

8-bit type code.

body: Vec<u8>

Body bytes (2 * h_len - 2 of them).

Mandatory

Mandatory header (H-LEN = 0) whose body consumes the remainder of the SNDU payload up to (but excluding) the CRC.

Test SNDU / Bridged-Frame / TS-Concat / PDU-Concat are all of this form; their inner structure is preserved as opaque bytes (the SNDU Length and CRC give the boundary).

Fields

h_type: u8

8-bit type code (0x00..0x03 for the RFC-registered set).

body: Vec<u8>

Body bytes — everything up to the CRC.

Implementations

impl ExtensionHeader

pub fn h_len(&self) -> u8

The H-LEN nibble this header serializes with.

pub fn h_type(&self) -> u8

The H-Type byte this header serializes with.

pub fn type_field(&self) -> TypeField

The introducing TypeField for this header.

pub fn is_mandatory(&self) -> bool

true if this is a mandatory (H-LEN = 0) extension header.

pub fn mandatory_h_type(&self) -> Option<MandatoryHType>

The typed MandatoryHType for a Mandatory header, or None if this is an Optional header.

pub fn optional_h_type(&self) -> Option<OptionalHType>

The typed OptionalHType for an Optional header, or None if this is a Mandatory header.

pub fn name(&self) -> &'static str

Spec label for this header kind.

pub fn wire_len(&self) -> usize

Total wire length of this header including its 2-byte introducing Type field.

Trait Implementations

impl Clone for ExtensionHeader

fn clone(&self) -> ExtensionHeader

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ExtensionHeader

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for ExtensionHeader

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for ExtensionHeader

impl PartialEq for ExtensionHeader

fn eq(&self, other: &ExtensionHeader) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for ExtensionHeader

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for ExtensionHeader