thalassa 0.0.2

Implementation of the TLS presentation language data format defined in RFC8446
Documentation 
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use std::borrow::Cow;

use crate::{
    TlsplDeserialize, TlsplSerialize, TlsplSize,
    error::{TlsplReadResult, TlsplWriteResult},
    types::ContentLengthLength,
};

impl<const N: usize> TlsplSize for [u8; N] {
    #[inline]
    fn tlspl_serialized_len(&self) -> usize {
        N
    }
}

/// This gets output as fixed-sized bytes, not VLBytes!
impl<const N: usize> TlsplSerialize for [u8; N] {
    #[inline]
    fn tlspl_serialize_to<W: crate::io::Write>(&self, writer: &mut W) -> TlsplWriteResult<usize> {
        writer.write(&self[..]).map_err(Into::into)
    }
}

impl<'a, const N: usize> TlsplSize for Cow<'a, [u8; N]> {
    fn tlspl_serialized_len(&self) -> usize {
        (**self).tlspl_serialized_len()
    }
}

/// Reads N bytes, not VLBytes!
impl<'tlspl, const N: usize> TlsplDeserialize<'tlspl> for Cow<'tlspl, [u8; N]> {
    #[inline]
    fn tlspl_deserialize_from<R: crate::io::Read<'tlspl>>(reader: &mut R) -> TlsplReadResult<Self>
    where
        Self: Sized + 'tlspl,
    {
        reader.read_array().map_err(Into::into)
    }
}

impl<'tlspl, const N: usize> TlsplDeserialize<'tlspl> for [u8; N] {
    #[inline]
    fn tlspl_deserialize_from<R: crate::io::Read<'tlspl>>(reader: &mut R) -> TlsplReadResult<Self>
    where
        Self: Sized + 'tlspl,
    {
        reader.read_array().map(|cow| *cow).map_err(Into::into)
    }
}

impl TlsplSize for &[u8] {
    #[inline]
    fn tlspl_serialized_len(&self) -> usize {
        ContentLengthLength::from_content_len(self.len()) as u8 as usize + self.len()
    }
}

impl<'a> TlsplSize for Cow<'a, [u8]> {
    #[inline]
    fn tlspl_serialized_len(&self) -> usize {
        (&**self).tlspl_serialized_len()
    }
}

impl TlsplSize for Vec<u8> {
    #[inline]
    fn tlspl_serialized_len(&self) -> usize {
        self.as_slice().tlspl_serialized_len()
    }
}

impl TlsplSerialize for &[u8] {
    #[inline]
    fn tlspl_serialize_to<W: crate::io::Write>(&self, writer: &mut W) -> TlsplWriteResult<usize> {
        let cl_len = ContentLengthLength::from_content_len(self.len());
        let written = cl_len.write_content_len(self.len(), writer)? + writer.write(self)?;

        debug_assert_eq!(written, self.tlspl_serialized_len(), "Write mismatch");

        Ok(written)
    }
}

impl<'a> TlsplSerialize for Cow<'a, [u8]> {
    #[inline]
    fn tlspl_serialize_to<W: crate::io::Write>(&self, writer: &mut W) -> TlsplWriteResult<usize> {
        (&**self).tlspl_serialize_to(writer)
    }
}

impl TlsplSerialize for Vec<u8> {
    #[inline]
    fn tlspl_serialize_to<W: crate::io::Write>(&self, writer: &mut W) -> TlsplWriteResult<usize> {
        self.as_slice().tlspl_serialize_to(writer)
    }
}

impl<'tlspl> TlsplDeserialize<'tlspl> for Cow<'tlspl, [u8]> {
    #[inline]
    fn tlspl_deserialize_from<R: crate::io::Read<'tlspl>>(reader: &mut R) -> TlsplReadResult<Self>
    where
        Self: Sized + 'tlspl,
    {
        let length = ContentLengthLength::read_content_len(reader)?;
        reader.read_slice(length).map_err(Into::into)
    }
}

impl<'tlspl> TlsplDeserialize<'tlspl> for Vec<u8> {
    #[inline]
    fn tlspl_deserialize_from<R: crate::io::Read<'tlspl>>(reader: &mut R) -> TlsplReadResult<Self>
    where
        Self: Sized + 'tlspl,
    {
        Cow::<[u8]>::tlspl_deserialize_from(reader).map(Cow::into_owned)
    }
}