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use crate::{Decodable, Decoder, Encodable, Encoder, ErrorKind, Length, Result, Tag};
use core::convert::TryInto;
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
pub struct Header {
pub tag: Tag,
pub length: Length,
}
impl Header {
pub fn new(tag: Tag, length: impl TryInto<Length>) -> Result<Self> {
let length = length.try_into().map_err(|_| ErrorKind::Overflow)?;
Ok(Self { tag, length })
}
}
impl Decodable<'_> for Header {
fn decode(decoder: &mut Decoder<'_>) -> Result<Header> {
let tag = Tag::decode(decoder)?;
let length = Length::decode(decoder).map_err(|e| {
if e.kind() == ErrorKind::Overlength {
ErrorKind::Length { tag }.into()
} else {
e
}
})?;
Ok(Self { tag, length })
}
}
impl Encodable for Header {
fn encoded_len(&self) -> Result<Length> {
self.tag.encoded_len()? + self.length.encoded_len()?
}
fn encode(&self, encoder: &mut Encoder<'_>) -> Result<()> {
self.tag.encode(encoder)?;
self.length.encode(encoder)
}
}