use crate::{MalformedData, Reader, Writer};

impl Reader for &[u8] {

    #[inline(always)]
    fn read(&mut self, bytes: &mut [u8]) -> e::Result<()> {
        if bytes.len() > self.len() { Err(MalformedData)? }
        
        unsafe {
            core::ptr::copy_nonoverlapping(
                self.as_ptr(),
                bytes.as_mut_ptr(),
                bytes.len()
            )
        }
        
        *self = &self[bytes.len()..];
        Ok(())
    }

    #[inline(always)]
    fn remainder_hint(&self) -> usize {
        self.len()
    }
}

#[cfg(feature = "alloc")]
impl Writer for alloc::vec::Vec<u8> {
    fn write(&mut self, bytes: &[u8]) -> e::Result<()> {
        self.extend_from_slice(bytes);
        Ok(())
    }
}