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use crate::*;
use alloc::borrow::Cow;
use core::convert::TryFrom;
impl<'a> TryFrom<Any<'a>> for &'a str {
type Error = Error;
fn try_from(any: Any<'a>) -> Result<&'a str> {
TryFrom::try_from(&any)
}
}
impl<'a, 'b> TryFrom<&'b Any<'a>> for &'a str {
type Error = Error;
fn try_from(any: &'b Any<'a>) -> Result<&'a str> {
any.tag().assert_eq(Self::TAG)?;
let s = Utf8String::try_from(any)?;
match s.data {
Cow::Borrowed(s) => Ok(s),
Cow::Owned(_) => Err(Error::LifetimeError),
}
}
}
impl<'a> CheckDerConstraints for &'a str {
fn check_constraints(any: &Any) -> Result<()> {
// X.690 section 10.2
any.header.assert_primitive()?;
Ok(())
}
}
impl DerAutoDerive for &'_ str {}
impl<'a> Tagged for &'a str {
const TAG: Tag = Tag::Utf8String;
}
#[cfg(feature = "std")]
impl<'a> ToDer for &'a str {
fn to_der_len(&self) -> Result<usize> {
let sz = self.as_bytes().len();
if sz < 127 {
// 1 (class+tag) + 1 (length) + len
Ok(2 + sz)
} else {
// 1 (class+tag) + n (length) + len
let n = Length::Definite(sz).to_der_len()?;
Ok(1 + n + sz)
}
}
fn write_der_header(&self, writer: &mut dyn std::io::Write) -> SerializeResult<usize> {
let header = Header::new(
Class::Universal,
false,
Self::TAG,
Length::Definite(self.as_bytes().len()),
);
header.write_der_header(writer).map_err(Into::into)
}
fn write_der_content(&self, writer: &mut dyn std::io::Write) -> SerializeResult<usize> {
writer.write(self.as_bytes()).map_err(Into::into)
}
}
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