Struct iso7816_tlv::ber::Tlv

pub struct Tlv { /* fields omitted */ }

BER-TLV structure, following ISO/IEC 7816-4.

BER-TLV data objects

Each BER-TLV data object consists of two or three consecutive fields (see the basic encoding rules of ASN.1 in ISO/IEC 8825-1): a mandatory tag field, a mandatory length field and a conditional value field.

• The tag field consists of one or more consecutive bytes. It indicates a class and an encoding and it encodes a tag number. The value '00' is invalid for the first byte of tag fields (see ISO/IEC 8825-1).
• The length field consists of one or more consecutive bytes. It encodes a length, i.e., a number denoted N.
• If N is zero, there is no value field, i.e., the data object is empty. Otherwise (N > 0), the value field consists of N consecutive bytes.

Methods

impl Tlv

pub fn new(tag: Tag, value: Value) -> Result<Self, TlvError>

Create a BER-TLV data object from valid tag and value Fails with TlvError::Inconsistant if the tag indicates a contructed value (resp. primitive) and the value is primitive (resp. contructed).

pub fn to_vec(&self) -> Vec<u8>

serializes self into a byte vector.

pub fn parse(input: &[u8]) -> (Result<Self, TlvError>, &[u8])

Parses a byte array into a BER-TLV structure. This also returns the unprocessed data.

pub fn from_bytes(input: &[u8]) -> Result<Self, TlvError>

Parses a byte array into a BER-TLV structure. Input must exactly match a BER-TLV object.

Trait Implementations

impl Clone for Tlv

fn clone(&self) -> Tlv

Returns a copy of the value.

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

Performs copy-assignment from source.

impl PartialEq<Tlv> for Tlv

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

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

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

This method tests for !=.

impl Debug for Tlv

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

Formats the value using the given formatter.

impl Display for Tlv

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

Formats the value using the given formatter.