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feat(asn1-parser): implement implicit tagging
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,107 @@ | ||
| use alloc::borrow::Cow; | ||
| use alloc::boxed::Box; | ||
| use alloc::vec::Vec; | ||
|
|
||
| use crate::asn1::Asn1; | ||
| use crate::length::{len_size, write_len}; | ||
| use crate::reader::Reader; | ||
| use crate::writer::Writer; | ||
| use crate::{Asn1Decoder, Asn1Encoder, Asn1Result, Asn1ValueDecoder, MetaInfo, Tag, Taggable}; | ||
|
|
||
| #[derive(Debug, Clone, PartialEq, Eq)] | ||
| pub struct ImplicitTag<'data> { | ||
| tag: u8, | ||
| octets: Cow<'data, [u8]>, | ||
| inner: Option<Box<Asn1<'data>>>, | ||
| } | ||
|
|
||
| pub type OwnedImplicitTag = ImplicitTag<'static>; | ||
|
|
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| impl<'data> ImplicitTag<'data> { | ||
| pub fn new_owned(tag: u8, octets: Vec<u8>) -> Self { | ||
| let inner = Asn1::decode_buff(&octets).ok().map(|mut asn1| { | ||
| asn1.clear_meta(); | ||
| Box::new(asn1.to_owned_with_asn1(asn1.inner_asn1().to_owned())) | ||
| }); | ||
|
|
||
| Self { | ||
| tag, | ||
| octets: Cow::Owned(octets), | ||
| inner, | ||
| } | ||
| } | ||
|
|
||
| pub fn tag_number(&self) -> u8 { | ||
| self.tag & 0x1f | ||
| } | ||
|
|
||
| pub fn inner_asn1(&self) -> Option<&Asn1<'data>> { | ||
| self.inner.as_ref().map(|asn1| asn1.as_ref()) | ||
| } | ||
|
|
||
| pub fn to_owned(&self) -> OwnedImplicitTag { | ||
| OwnedImplicitTag { | ||
| tag: self.tag, | ||
| octets: self.octets.to_vec().into(), | ||
| inner: self | ||
| .inner | ||
| .as_ref() | ||
| .map(|inner| Box::new(inner.to_owned_with_asn1(inner.inner_asn1().to_owned()))), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| impl Taggable for ImplicitTag<'_> { | ||
| fn tag(&self) -> Tag { | ||
| Tag(self.tag) | ||
| } | ||
| } | ||
|
|
||
| impl<'data> Asn1ValueDecoder<'data> for ImplicitTag<'data> { | ||
| fn decode(tag: Tag, reader: &mut Reader<'data>) -> Asn1Result<Self> { | ||
| let data = reader.read_remaining(); | ||
|
|
||
| let mut inner_reader = Reader::new(data); | ||
| inner_reader.set_next_id(reader.next_id()); | ||
| inner_reader.set_offset(reader.full_offset() - data.len()); | ||
| let inner = Asn1::decode(&mut inner_reader).ok().map(Box::new); | ||
|
|
||
| if !inner_reader.empty() && inner.is_some() { | ||
| return Err("implicit tag inner data contains leftovers".into()); | ||
| } | ||
|
|
||
| reader.set_next_id(inner_reader.next_id()); | ||
|
|
||
| Ok(Self { | ||
| tag: tag.0, | ||
| octets: Cow::Borrowed(data), | ||
| inner, | ||
| }) | ||
| } | ||
|
|
||
| fn compare_tags(tag: Tag) -> bool { | ||
| tag.is_context_specific() && tag.is_primitive() | ||
| } | ||
| } | ||
|
|
||
| impl Asn1Encoder for ImplicitTag<'_> { | ||
| fn needed_buf_size(&self) -> usize { | ||
| let data_len = self.octets.len(); | ||
|
|
||
| 1 /* tag */ + len_size(data_len) + data_len | ||
| } | ||
|
|
||
| fn encode(&self, writer: &mut Writer) -> Asn1Result<()> { | ||
| writer.write_byte(self.tag)?; | ||
| write_len(self.octets.len(), writer)?; | ||
| writer.write_slice(&self.octets) | ||
| } | ||
| } | ||
|
|
||
| impl MetaInfo for ImplicitTag<'_> { | ||
| fn clear_meta(&mut self) { | ||
| if let Some(asn1) = self.inner.as_mut() { | ||
| asn1.clear_meta() | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,5 +1,7 @@ | ||
| mod application; | ||
| mod explicit; | ||
| mod implicit; | ||
|
|
||
| pub use application::{ApplicationTag, OwnedApplicationTag}; | ||
| pub use explicit::{ExplicitTag, OwnedExplicitTag}; | ||
| pub use implicit::{ImplicitTag, OwnedImplicitTag}; |