Struct yasna::BERReaderSet
source · [−]pub struct BERReaderSet<'a, 'b> where
'a: 'b, { /* private fields */ }
Expand description
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 = reader.next(&[TAG_INTEGER])?.read_i64()?;
let b = reader.next(&[TAG_BOOLEAN])?.read_bool()?;
return Ok((i, b));
})
}).unwrap();
assert_eq!(asn, (10, true));
Implementations
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>,
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 = reader.read_optional(&[TAG_INTEGER], |reader| {
reader.read_i64()
})?;
let b = 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,
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 = reader.read_default(&[TAG_INTEGER], 10, |reader| {
reader.read_i64()
})?;
let b = reader.next(&[TAG_BOOLEAN])?.read_bool()?;
return Ok((i, b));
})
}).unwrap();
assert_eq!(asn, (10, true));