//! Encoding support.

#[cfg(feature = "alloc")]

use alloc::vec::Vec;

/// Support for decoding/encoding signatures as bytes.

pub trait SignatureEncoding:

    Clone + Sized + for<'a> TryFrom<&'a [u8]> + TryInto<Self::Repr>

{

    /// Byte representation of a signature.

    type Repr: 'static + AsRef<[u8]> + Clone + Send + Sync;

    /// Encode signature as its byte representation.

    fn to_bytes(&self) -> Self::Repr {

        self.clone()

            .try_into()

            .ok()

            .expect("signature encoding error")

    }

    /// Encode signature as a byte vector.

    #[cfg(feature = "alloc")]

    fn to_vec(&self) -> Vec<u8> {

        self.to_bytes().as_ref().to_vec()

    }

    /// Get the length of this signature when encoded.

    fn encoded_len(&self) -> usize {

        self.to_bytes().as_ref().len()

    }

}