Struct der::asn1::BitStringRef

pub struct BitStringRef<'a> { /* private fields */ }

ASN.1 BIT STRING type.

This type contains a sequence of any number of bits, modeled internally as a sequence of bytes with a known number of “unused bits”.

This is a zero-copy reference type which borrows from the input data.

Implementations

impl<'a> BitStringRef<'a>

pub const MAX_UNUSED_BITS: u8 = 7u8

Maximum number of unused bits allowed.

pub fn new(unused_bits: u8, bytes: &'a [u8]) -> Result<Self>

Create a new ASN.1 BIT STRING from a byte slice.

Accepts an optional number of “unused bits” (0-7) which are omitted from the final octet. This number is 0 if the value is octet-aligned.

pub fn from_bytes(bytes: &'a [u8]) -> Result<Self>

Create a new ASN.1 BIT STRING from the given bytes.

The “unused bits” are set to 0.

pub fn unused_bits(&self) -> u8

Get the number of unused bits in this byte slice.

pub fn has_unused_bits(&self) -> bool

Is the number of unused bits a value other than 0?

pub fn bit_len(&self) -> usize

Get the length of this BIT STRING in bits.

pub fn byte_len(&self) -> Length

Get the number of bytes/octets needed to represent this BIT STRING when serialized in an octet-aligned manner.

pub fn is_empty(&self) -> bool

Is the inner byte slice empty?

pub fn as_bytes(&self) -> Option<&'a [u8]>

Borrow the inner byte slice.

Returns None if the number of unused bits is not equal to zero, i.e. if the BIT STRING is not octet aligned.

Use [BitString::raw_bytes] to obtain access to the raw value regardless of the presence of unused bits.

pub fn raw_bytes(&self) -> &'a [u8]

Borrow the raw bytes of this BIT STRING.

Note that the byte string may contain extra unused bits in the final octet. If the number of unused bits is expected to be 0, the BitStringRef::as_bytes function can be used instead.

pub fn bits(self) -> BitStringIter<'a>

Iterator over the bits of this BIT STRING.

Trait Implementations

impl<'a> Clone for BitStringRef<'a>

fn clone(&self) -> BitStringRef<'a>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'a> Debug for BitStringRef<'a>

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

Formats the value using the given formatter.

impl<'a> DecodeValue<'a> for BitStringRef<'a>

fn decode_value<R: Reader<'a>>(reader: &mut R, header: Header) -> Result<Self>

Attempt to decode this message using the provided Reader.

impl EncodeValue for BitStringRef<'_>

fn value_len(&self) -> Result<Length>

Compute the length of this value (sans Tag+Length header) when encoded as ASN.1 DER.

fn encode_value(&self, writer: &mut dyn Writer) -> Result<()>

Encode value (sans Tag+Length header) as ASN.1 DER using the provided Writer.

fn header(&self) -> Result<Header>where Self: Tagged,

Get the Header used to encode this value.

impl<'a> FixedTag for BitStringRef<'a>

const TAG: Tag = Tag::BitString

ASN.1 tag

impl<'a> From<&BitStringRef<'a>> for BitStringRef<'a>

fn from(value: &BitStringRef<'a>) -> BitStringRef<'a>

Converts to this type from the input type.

impl<'a> Ord for BitStringRef<'a>

fn cmp(&self, other: &BitStringRef<'a>) -> Ordering

This method returns an Ordering between self and other.

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

Compares and returns the maximum of two values.

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

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Selfwhere Self: Sized + PartialOrd<Self>,

Restrict a value to a certain interval.

impl<'a> PartialEq<BitStringRef<'a>> for BitStringRef<'a>

fn eq(&self, other: &BitStringRef<'a>) -> bool

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

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

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

impl<'a> PartialOrd<BitStringRef<'a>> for BitStringRef<'a>

fn partial_cmp(&self, other: &BitStringRef<'a>) -> Option<Ordering>

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

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

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

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

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

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

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

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<'a> TryFrom<&&'a [u8]> for BitStringRef<'a>

Hack for simplifying the custom derive use case.

type Error = Error

The type returned in the event of a conversion error.

fn try_from(bytes: &&'a [u8]) -> Result<BitStringRef<'a>>

Performs the conversion.

impl<'a> TryFrom<&'a [u8]> for BitStringRef<'a>

type Error = Error

The type returned in the event of a conversion error.

fn try_from(bytes: &'a [u8]) -> Result<BitStringRef<'a>>

Performs the conversion.

impl<'a> TryFrom<AnyRef<'a>> for BitStringRef<'a>

type Error = Error

The type returned in the event of a conversion error.

fn try_from(any: AnyRef<'a>) -> Result<BitStringRef<'a>>

Performs the conversion.

impl<'a> TryFrom<BitStringRef<'a>> for &'a [u8]

type Error = Error

The type returned in the event of a conversion error.

fn try_from(bit_string: BitStringRef<'a>) -> Result<&'a [u8]>

Performs the conversion.

impl ValueOrd for BitStringRef<'_>

fn value_cmp(&self, other: &Self) -> Result<Ordering>

Return an Ordering between value portion of TLV-encoded self and other when serialized as ASN.1 DER.

impl<'a> Copy for BitStringRef<'a>

impl<'a> Eq for BitStringRef<'a>

impl<'a> StructuralEq for BitStringRef<'a>

impl<'a> StructuralPartialEq for BitStringRef<'a>