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// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// Copyright by contributors to this project.
// SPDX-License-Identifier: (Apache-2.0 OR MIT)
use crate::{iter::mls_decode_split_on_collection, Error, MlsEncode, MlsSize, VarInt};
use alloc::vec::Vec;
/// Optimized length calculation for types that can be represented as u8 slices.
pub fn mls_encoded_len<T>(data: &T) -> usize
where
T: AsRef<[u8]>,
{
fn slice_len(data: &[u8]) -> usize {
let len = data.len();
let header_length = VarInt::try_from(len).unwrap_or(VarInt(0)).mls_encoded_len();
header_length + len
}
slice_len(data.as_ref())
}
/// Optimized encoding for types that can be represented as u8 slices.
pub fn mls_encode<T>(data: &T, writer: &mut Vec<u8>) -> Result<(), Error>
where
T: AsRef<[u8]>,
{
fn encode_slice(data: &[u8], writer: &mut Vec<u8>) -> Result<(), Error> {
let len = VarInt::try_from(data.len())?;
len.mls_encode(writer)?;
writer.extend_from_slice(data);
Ok(())
}
encode_slice(data.as_ref(), writer)
}
/// Optimized decoding for types that can be represented as `Vec<u8>`
pub fn mls_decode<T>(reader: &mut &[u8]) -> Result<T, crate::Error>
where
T: From<Vec<u8>>,
{
fn decode_vec(reader: &mut &[u8]) -> Result<Vec<u8>, crate::Error> {
let (data, rest) = mls_decode_split_on_collection(reader)?;
*reader = rest;
Ok(data.to_vec())
}
let out = decode_vec(reader)?;
Ok(out.into())
}