lber-serde 0.4.5

An ASN.1/BER parser/encoder based on nom
Documentation 
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use common::TagClass;

#[cfg(feature = "serde")]
extern crate serde;

/// ASN.1 structure prepared for serialization.
#[derive(Clone, PartialEq, Debug, Eq)]
pub struct StructureTag {
    pub class: TagClass,
    pub id: u64,
    pub payload: PL,
}

#[cfg(feature = "serde")]
impl self::serde::Serialize for StructureTag {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: self::serde::Serializer,
    {
        use self::serde::ser::SerializeStruct;
        let mut seq = serializer.serialize_struct("StructureTag", 3)?;
        seq.serialize_field("class", &self.class)?;
        seq.serialize_field("element", &self.id)?;
        match self.payload {
            PL::P(ref v) => seq.serialize_field("payload", v),
            PL::C(ref v) => seq.serialize_field("payload", v),
        }?;
        seq.end()
    }
}

/// Tagged value payload.
#[derive(Clone, PartialEq, Debug, Eq)]
pub enum PL {
    /// Primitive value.
    P(Vec<u8>),
    /// Constructed value.
    C(Vec<StructureTag>),
}

#[cfg(feature = "serde")]
impl self::serde::Serialize for PL {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: self::serde::Serializer,
    {
        match *self {
            PL::P(ref v) => serializer.serialize_bytes(v),
            PL::C(ref v) => {
                use self::serde::ser::SerializeSeq;
                let mut ser = serializer.serialize_seq(Some(v.len()))?;
                for e in v {
                    ser.serialize_element(e)?;
                }
                ser.end()
            }
        }
    }
}

impl StructureTag {
    pub fn match_class(self, class: TagClass) -> Option<Self> {
        if self.class == class {
            Some(self)
        } else {
            None
        }
    }

    pub fn match_id(self, id: u64) -> Option<Self> {
        if self.id == id {
            Some(self)
        } else {
            None
        }
    }

    pub fn expect_constructed(self) -> Option<Vec<StructureTag>> {
        match self.payload {
            PL::P(_) => None,
            PL::C(i) => Some(i),
        }
    }

    pub fn expect_primitive(self) -> Option<Vec<u8>> {
        match self.payload {
            PL::P(i) => Some(i),
            PL::C(_) => None,
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use common::TagClass;

    #[test]
    fn expect_exact() {
        let tag = StructureTag {
            class: TagClass::Application,
            id: 65u64,
            payload: PL::C(vec![StructureTag {
                class: TagClass::Universal,
                id: 2u64,
                payload: PL::P(vec![0x16, 0x16]),
            }]),
        };

        let out = tag
            .clone()
            .match_class(TagClass::Application)
            .and_then(|x| x.match_id(65u64));

        assert_eq!(out, Some(tag));
    }

    #[test]
    fn expect_inner() {
        let tag = StructureTag {
            class: TagClass::Application,
            id: 65u64,
            payload: PL::C(vec![
                StructureTag {
                    class: TagClass::Universal,
                    id: 2u64,
                    payload: PL::P(vec![0x16, 0x16]),
                },
                StructureTag {
                    class: TagClass::Application,
                    id: 3u64,
                    payload: PL::P(vec![0x3, 0x3]),
                },
            ]),
        };

        let mut subt = tag.expect_constructed().unwrap();

        let b = subt
            .pop()
            .unwrap()
            .match_class(TagClass::Application)
            .and_then(|x| x.match_id(3));
        let a = subt
            .pop()
            .unwrap()
            .match_class(TagClass::Universal)
            .and_then(|x| x.match_id(2));

        assert!(a.is_some());
        assert!(b.is_some());
    }
}