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use crate::*;
use core::convert::TryFrom;
#[derive(Debug, PartialEq, Eq)]
pub struct Null {}
impl Null {
pub const fn new() -> Self {
Null {}
}
}
impl<'a> TryFrom<Any<'a>> for Null {
type Error = Error;
fn try_from(any: Any<'a>) -> Result<Null> {
TryFrom::try_from(&any)
}
}
impl<'a, 'b> TryFrom<&'b Any<'a>> for Null {
type Error = Error;
fn try_from(any: &'b Any<'a>) -> Result<Null> {
any.tag().assert_eq(Self::TAG)?;
if !any.header.length.is_null() {
return Err(Error::InvalidLength);
}
Ok(Null {})
}
}
impl CheckDerConstraints for Null {
fn check_constraints(_any: &Any) -> Result<()> {
Ok(())
}
}
impl DerAutoDerive for Null {}
impl<'a> Tagged for Null {
const TAG: Tag = Tag::Null;
}
#[cfg(feature = "std")]
impl ToDer for Null {
fn to_der_len(&self) -> Result<usize> {
Ok(2)
}
fn write_der_header(&self, writer: &mut dyn std::io::Write) -> SerializeResult<usize> {
writer.write(&[0x05, 0x00]).map_err(Into::into)
}
fn write_der_content(&self, _writer: &mut dyn std::io::Write) -> SerializeResult<usize> {
Ok(0)
}
}
impl<'a> TryFrom<Any<'a>> for () {
type Error = Error;
fn try_from(any: Any<'a>) -> Result<()> {
any.tag().assert_eq(Self::TAG)?;
any.header.assert_primitive()?;
if !any.header.length.is_null() {
return Err(Error::InvalidLength);
}
Ok(())
}
}
impl<'a> CheckDerConstraints for () {
fn check_constraints(_any: &Any) -> Result<()> {
Ok(())
}
}
impl DerAutoDerive for () {}
impl<'a> Tagged for () {
const TAG: Tag = Tag::Null;
}
#[cfg(feature = "std")]
impl ToDer for () {
fn to_der_len(&self) -> Result<usize> {
Ok(2)
}
fn write_der_header(&self, writer: &mut dyn std::io::Write) -> SerializeResult<usize> {
writer.write(&[0x05, 0x00]).map_err(Into::into)
}
fn write_der_content(&self, _writer: &mut dyn std::io::Write) -> SerializeResult<usize> {
Ok(0)
}
}