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|
use crate::*;
use core::convert::TryFrom;
#[derive(Debug, PartialEq, Eq)]
pub struct EmbeddedPdv<'a> {
pub identification: PdvIdentification<'a>,
pub data_value_descriptor: Option<ObjectDescriptor<'a>>,
pub data_value: &'a [u8],
}
#[derive(Debug, PartialEq, Eq)]
pub enum PdvIdentification<'a> {
Syntaxes {
s_abstract: Oid<'a>,
s_transfer: Oid<'a>,
},
Syntax(Oid<'a>),
PresentationContextId(Integer<'a>),
ContextNegotiation {
presentation_context_id: Integer<'a>,
presentation_syntax: Oid<'a>,
},
TransferSyntax(Oid<'a>),
Fixed,
}
impl<'a> TryFrom<Any<'a>> for EmbeddedPdv<'a> {
type Error = Error;
fn try_from(any: Any<'a>) -> Result<Self> {
TryFrom::try_from(&any)
}
}
impl<'a, 'b> TryFrom<&'b Any<'a>> for EmbeddedPdv<'a> {
type Error = Error;
fn try_from(any: &'b Any<'a>) -> Result<Self> {
let data = any.data;
// AUTOMATIC TAGS means all values will be tagged (IMPLICIT)
// [0] -> identification
let (rem, seq0) =
TaggedParser::<Explicit, Any>::parse_ber(Class::ContextSpecific, Tag(0), data)?;
let inner = seq0.inner;
let identification = match inner.tag() {
Tag(0) => {
// syntaxes SEQUENCE {
// abstract OBJECT IDENTIFIER,
// transfer OBJECT IDENTIFIER
// },
// AUTOMATIC tags -> implicit! Hopefully, Oid does not check tag value!
let (rem, s_abstract) = Oid::from_ber(inner.data)?;
let (_, s_transfer) = Oid::from_ber(rem)?;
PdvIdentification::Syntaxes {
s_abstract,
s_transfer,
}
}
Tag(1) => {
// syntax OBJECT IDENTIFIER
let oid = Oid::new(inner.data.into());
PdvIdentification::Syntax(oid)
}
Tag(2) => {
// presentation-context-id INTEGER
let i = Integer::new(inner.data);
PdvIdentification::PresentationContextId(i)
}
Tag(3) => {
// context-negotiation SEQUENCE {
// presentation-context-id INTEGER,
// transfer-syntax OBJECT IDENTIFIER
// },
// AUTOMATIC tags -> implicit!
let (rem, any) = Any::from_ber(inner.data)?;
let presentation_context_id = Integer::new(any.data);
let (_, presentation_syntax) = Oid::from_ber(rem)?;
PdvIdentification::ContextNegotiation {
presentation_context_id,
presentation_syntax,
}
}
Tag(4) => {
// transfer-syntax OBJECT IDENTIFIER
let oid = Oid::new(inner.data.into());
PdvIdentification::TransferSyntax(oid)
}
Tag(5) => {
// fixed NULL
PdvIdentification::Fixed
}
_ => {
return Err(inner
.tag()
.invalid_value("Invalid identification tag in EMBEDDED PDV"))
}
};
// [1] -> data-value-descriptor ObjectDescriptor OPTIONAL
// *BUT* WITH COMPONENTS data-value-descriptor ABSENT
// XXX this should be parse_ber?
// let (rem, data_value_descriptor) =
// TaggedOptional::from(1).parse_der(rem, |_, inner| ObjectDescriptor::from_ber(inner))?;
let (rem, data_value_descriptor) = (rem, None);
// [2] -> data-value OCTET STRING
let (_, data_value) =
TaggedParser::<Implicit, &[u8]>::parse_ber(Class::ContextSpecific, Tag(2), rem)?;
let data_value = data_value.inner;
let obj = EmbeddedPdv {
identification,
data_value_descriptor,
data_value,
};
Ok(obj)
}
}
impl CheckDerConstraints for EmbeddedPdv<'_> {
fn check_constraints(any: &Any) -> Result<()> {
any.header.length().assert_definite()?;
any.header.assert_constructed()?;
Ok(())
}
}
impl DerAutoDerive for EmbeddedPdv<'_> {}
|
