Function esp_idf_svc::io::utils::copy_len

source ยท 
pub fn copy_len<R, W>(
    read: R,
    write: W,
    buf: &mut [u8],
    len: u64,
) -> Result<u64, CopyError<<R as ErrorType>::Error, <W as ErrorType>::Error>>
where
    R: Read,
    W: Write,