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use crate::*;
impl<'a, T> FromBer<'a> for Option<T>
where
T: FromBer<'a>,
{
fn from_ber(bytes: &'a [u8]) -> ParseResult<Self> {
if bytes.is_empty() {
return Ok((bytes, None));
}
match T::from_ber(bytes) {
Ok((rem, t)) => Ok((rem, Some(t))),
Err(nom::Err::Error(Error::UnexpectedTag { .. })) => Ok((bytes, None)),
Err(e) => Err(e),
}
}
}
impl<'a, T> FromDer<'a> for Option<T>
where
T: FromDer<'a>,
{
fn from_der(bytes: &'a [u8]) -> ParseResult<Self> {
if bytes.is_empty() {
return Ok((bytes, None));
}
match T::from_der(bytes) {
Ok((rem, t)) => Ok((rem, Some(t))),
Err(nom::Err::Error(Error::UnexpectedTag { .. })) => Ok((bytes, None)),
Err(e) => Err(e),
}
}
}
impl<T> CheckDerConstraints for Option<T>
where
T: CheckDerConstraints,
{
fn check_constraints(any: &Any) -> Result<()> {
T::check_constraints(any)
}
}
impl<T> DynTagged for Option<T>
where
T: DynTagged,
{
fn tag(&self) -> Tag {
if self.is_some() {
self.tag()
} else {
Tag(0)
}
}
}
#[cfg(feature = "std")]
impl<T> ToDer for Option<T>
where
T: ToDer,
{
fn to_der_len(&self) -> Result<usize> {
match self {
None => Ok(0),
Some(t) => t.to_der_len(),
}
}
fn write_der_header(&self, writer: &mut dyn std::io::Write) -> SerializeResult<usize> {
match self {
None => Ok(0),
Some(t) => t.write_der_header(writer),
}
}
fn write_der_content(&self, writer: &mut dyn std::io::Write) -> SerializeResult<usize> {
match self {
None => Ok(0),
Some(t) => t.write_der_content(writer),
}
}
}