Struct yasna::BERReaderSeq

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pub struct BERReaderSeq<'a, 'b>where
    'a: 'b,{ /* private fields */ }
Expand description

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

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

Examples

use yasna;
let data = &[48, 6, 2, 1, 10, 1, 1, 255];
let asn = yasna::parse_der(data, |reader| {
    reader.read_sequence(|reader| {
        let i = reader.next().read_i64()?;
        let b = reader.next().read_bool()?;
        return Ok((i, b));
    })
}).unwrap();
assert_eq!(asn, (10, true));

Implementations§

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impl<'a, 'b> BERReaderSeq<'a, 'b>

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pub fn mode(&self) -> BERMode

Tells which format we are parsing, BER or DER.

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pub fn next<'c>(&'c mut self) -> BERReader<'a, 'c>

Generates a new BERReader.

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

Tries to read an ASN.1 value. If it fails at the first tag, it doesn’t consume buffer and returns None.

Used to parse OPTIONAL elements.

Examples
use yasna;
let data = &[48, 3, 1, 1, 255];
let asn = yasna::parse_der(data, |reader| {
    reader.read_sequence(|reader| {
        let i = reader.read_optional(|reader| {
            reader.read_i64()
        })?;
        let b = reader.next().read_bool()?;
        return Ok((i, b));
    })
}).unwrap();
assert_eq!(asn, (None, true));
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pub fn read_default<T, F>(&mut self, 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;
let data = &[48, 3, 1, 1, 255];
let asn = yasna::parse_der(data, |reader| {
    reader.read_sequence(|reader| {
        let i = reader.read_default(10, |reader| {
            reader.read_i64()
        })?;
        let b = reader.next().read_bool()?;
        return Ok((i, b));
    })
}).unwrap();
assert_eq!(asn, (10, true));
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pub fn read_with_buffer<T, F>( &mut self, callback: F ) -> ASN1Result<(T, &'a [u8])>where F: for<'c> FnOnce(&mut BERReaderSeq<'a, 'c>) -> ASN1Result<T>,

Trait Implementations§

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

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

Formats the value using the given formatter. Read more

Auto Trait Implementations§

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impl<'a, 'b> RefUnwindSafe for BERReaderSeq<'a, 'b>

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impl<'a, 'b> Send for BERReaderSeq<'a, 'b>

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impl<'a, 'b> Sync for BERReaderSeq<'a, 'b>

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impl<'a, 'b> Unpin for BERReaderSeq<'a, 'b>where 'a: 'b,

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impl<'a, 'b> !UnwindSafe for BERReaderSeq<'a, 'b>

Blanket Implementations§

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impl<T> Any for Twhere T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for Twhere T: ?Sized,

const: unstable · source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

const: unstable · source§

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

const: unstable · source§

fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere U: From<T>,

const: unstable · source§

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
const: unstable · source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
const: unstable · source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.