Struct yasna::BERReaderSet

pub struct BERReaderSet<'a, 'b> where
    'a: 'b,  { /* fields omitted */ }

A reader object for a set of BER/DER-encoded ASN.1 data.

The main source of this object is the read_set method from BERReader.

Examples

use yasna;
use yasna::tags::{TAG_INTEGER,TAG_BOOLEAN};
let data = &[49, 6, 1, 1, 255, 2, 1, 10];
let asn = yasna::parse_der(data, |reader| {
    reader.read_set(|reader| {
        let i = try!(try!(reader.next(&[TAG_INTEGER])).read_i64());
        let b = try!(try!(reader.next(&[TAG_BOOLEAN])).read_bool());
        return Ok((i, b));
    })
}).unwrap();
assert_eq!(asn, (10, true));

Implementations

impl<'a, 'b> BERReaderSet<'a, 'b>

pub fn mode(&self) -> BERMode

Tells which format we are parsing, BER or DER.

pub fn next<'c>(&'c mut self, tag_hint: &[Tag]) -> ASN1Result<BERReader<'a, 'c>>

Generates a new BERReader.

This method needs tag_hint to determine the position of the data.

pub fn read_optional<T, F>(
    &mut self,
    tag_hint: &[Tag],
    callback: F
) -> ASN1Result<Option<T>> where
    F: for<'c> FnOnce(BERReader<'a, 'c>) -> ASN1Result<T>, 

If there is a set element with a tag in tag_hint, reads an ASN.1 value from that element and returns Some(_). Otherwise, returns None.

Used to parse OPTIONAL elements.

Examples

use yasna;
use yasna::tags::*;
let data = &[49, 3, 1, 1, 255];
let asn = yasna::parse_der(data, |reader| {
    reader.read_set(|reader| {
        let i = try!(reader.read_optional(&[TAG_INTEGER], |reader| {
            reader.read_i64()
        }));
        let b = try!(try!(reader.next(&[TAG_BOOLEAN])).read_bool());
        return Ok((i, b));
    })
}).unwrap();
assert_eq!(asn, (None, true));

pub fn read_default<T, F>(
    &mut self,
    tag_hint: &[Tag],
    default: T,
    callback: F
) -> ASN1Result<T> where
    F: for<'c> FnOnce(BERReader<'a, 'c>) -> ASN1Result<T>,
    T: Eq, 

Similar to read_optional, but uses default if it fails.

T: Eq is required because it fails in DER mode if the read value is equal to default.

Used to parse DEFAULT elements.

Examples

use yasna;
use yasna::tags::*;
let data = &[49, 3, 1, 1, 255];
let asn = yasna::parse_der(data, |reader| {
    reader.read_set(|reader| {
        let i = try!(reader.read_default(&[TAG_INTEGER], 10, |reader| {
            reader.read_i64()
        }));
        let b = try!(try!(reader.next(&[TAG_BOOLEAN])).read_bool());
        return Ok((i, b));
    })
}).unwrap();
assert_eq!(asn, (10, true));

Trait Implementations

impl<'a, 'b> Debug for BERReaderSet<'a, 'b> where
    'a: 'b, 

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

Formats the value using the given formatter.