Struct der::TagNumber

pub struct TagNumber(_);

ASN.1 tag numbers (i.e. lower 5 bits of a Tag).

From X.690 Section 8.1.2.2:

bits 5 to 1 shall encode the number of the tag as a binary integer with bit 5 as the most significant bit.

This library supports tag numbers ranging from zero to 30 (inclusive), which can be represented as a single identifier octet.

Section 8.1.2.4 describes how to support multi-byte tag numbers, which are encoded by using a leading tag number of 31 (0b11111). This library deliberately does not support this: tag numbers greater than 30 are disallowed.

Implementations

impl TagNumber

pub const MAX: u8

Maximum tag number supported (inclusive).

pub const fn new(byte: u8) -> Self

Create a new tag number (const-friendly).

Panics if the tag number is greater than TagNumber::MAX. For a fallible conversion, use TryFrom instead.

pub fn application(self) -> Tag

Create an APPLICATION tag with this tag number.

pub fn context_specific(self) -> Tag

Create a CONTEXT-SPECIFIC tag with this tag number.

pub fn private(self) -> Tag

Create a PRIVATE tag with this tag number.

pub fn value(self) -> u8

Get the inner value.

Trait Implementations

impl Clone for TagNumber

fn clone(&self) -> TagNumber

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for TagNumber

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

Formats the value using the given formatter.

impl Display for TagNumber

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

Formats the value using the given formatter.

impl Ord for TagNumber

fn cmp(&self, other: &TagNumber) -> Ordering

This method returns an Ordering between self and other.

#[must_use]

fn max(self, other: Self) -> Self

Compares and returns the maximum of two values.

#[must_use]

fn min(self, other: Self) -> Self

Compares and returns the minimum of two values.

#[must_use]

fn clamp(self, min: Self, max: Self) -> Self

Restrict a value to a certain interval.

impl PartialEq<TagNumber> for TagNumber

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

This method tests for self and other values to be equal, and is used by ==.

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

This method tests for !=.

impl PartialOrd<TagNumber> for TagNumber

fn partial_cmp(&self, other: &TagNumber) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

#[must_use]

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

This method tests less than (for self and other) and is used by the < operator.

#[must_use]

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

This method tests less than or equal to (for self and other) and is used by the <= operator.

#[must_use]

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

This method tests greater than (for self and other) and is used by the > operator.

#[must_use]

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

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl TryFrom<u8> for TagNumber

type Error = Error

The type returned in the event of a conversion error.

fn try_from(byte: u8) -> Result<Self>

Performs the conversion.

impl Copy for TagNumber

impl Eq for TagNumber

impl StructuralEq for TagNumber

impl StructuralPartialEq for TagNumber