Struct OptionHeader 

pub struct OptionHeader<T: AsRef<[u8]>> { /* private fields */ }

Zero-copy wrapper around Option header (4 bytes).

All SOME/IP-SD options start with this 4-byte header containing the length, type, and discardable flag.

Wire format (4 bytes):

0               1               2               3
0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|           Length              |     Type      |D|  Reserved   |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Implementations

impl<T: AsRef<[u8]>> OptionHeader<T>

pub const LENGTH: usize = 4usize

Option header wire format size in bytes.

pub fn new_unchecked(buffer: T) -> Self

Create an OptionHeader without validation.

Parameters

• buffer - The buffer containing the 4-byte header

Safety

This does not validate buffer length. Use new_checked for validation.

pub fn new_checked(buffer: T) -> Result<Self>

Create an OptionHeader from a buffer with length validation.

Parameters

• buffer - The buffer containing the 4-byte header

Returns

• Ok(OptionHeader) if buffer is at least 4 bytes
• Err(Error) if buffer is too short

pub fn check_len(&self) -> Result<()>

Validate that the buffer is at least 4 bytes long.

Returns

• Ok(()) if buffer meets minimum length requirement
• Err(Error) if buffer is too short

pub fn check_option_type(&self) -> Result<()>

Validate the option type field contains a known option type.

Returns

• Ok(()) if option type is valid
• Err(Error::InvalidOptionType) if option type is unknown

pub fn length(&self) -> u16

Get the Length field (2 bytes at offset 0-1, network byte order).

Returns

Length of the option data (excluding the 4-byte header itself)

pub fn option_type(&self) -> u8

Get the Type field (1 byte at offset 2).

Returns

Option type value (use OptionType::from_u8 to parse)

pub fn discardable_flag(&self) -> DiscardableFlag

Get the Discardable flag and reserved bits (1 byte at offset 3).

Returns

DiscardableFlag containing the discardable bit and reserved bits

impl<T: AsRef<[u8]> + AsMut<[u8]>> OptionHeader<T>

pub fn set_length(&mut self, value: u16)

Set the Length field (2 bytes at offset 0-1, network byte order).

Parameters

• value - Length of option data (excluding the 4-byte header)

pub fn set_option_type(&mut self, value: u8)

Set the Type field (1 byte at offset 2).

Parameters

• value - Option type value (use OptionType::as_u8 for enum values)

pub fn set_discardable_flag(&mut self, value: DiscardableFlag)

Set the Discardable flag and reserved bits (1 byte at offset 3).

Parameters

• value - DiscardableFlag with the desired bit pattern

Trait Implementations

impl<T: Clone + AsRef<[u8]>> Clone for OptionHeader<T>

fn clone(&self) -> OptionHeader<T>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T: Debug + AsRef<[u8]>> Debug for OptionHeader<T>

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

Formats the value using the given formatter.

impl<T: Copy + AsRef<[u8]>> Copy for OptionHeader<T>