Function encode_tls_data

tls/src/rustls.rs:502–515

Encode TLS handshake data into the write buffer, resizing if needed.

(state: &mut unbuffered::EncodeTlsData<'_, Data>, write_buf: &mut BytesMut)

/// Encode TLS handshake data into the write buffer, resizing if needed.
fn encode_tls_data<Data>(state: &mut unbuffered::EncodeTlsData<'_, Data>, write_buf: &mut BytesMut) -> io::Result<()> {
    // SAFETY: EncodeTlsData::encode copies a single chunk contiguously from index 0.
    // On Ok(n), exactly n bytes are written. On InsufficientSize or AlreadyEncoded,
    // the size check happens before any write so the slice is untouched.
    while let Err(e) = unsafe { SpareCapBuf::new(write_buf).with_mut_slice(|slice| state.encode(slice)) } {
        match e {
            unbuffered::EncodeError::InsufficientSize(unbuffered::InsufficientSizeError { required_size }) => {
                write_buf.reserve(required_size);
            }
            e => return Err(io::Error::new(io::ErrorKind::InvalidData, e.to_string())),
        }
    }
    Ok(())
}

/// Encrypt plaintext into the write buffer, resizing if needed.
fn encrypt_to_buf<Data>(