varnish 0.0.12

/// VSB, growable buffer
pub struct Vsb<'a> {
    pub raw: &'a mut varnish_sys::vsb,
}

impl<'a> Vsb<'a> {
    /// Create a `Vsb` from a C pointer
    #[allow(clippy::not_unsafe_ptr_arg_deref)]
    pub fn new(raw: *mut varnish_sys::vsb) -> Self {
        let raw = unsafe { raw.as_mut().unwrap() };
        assert_eq!(raw.magic, varnish_sys::VSB_MAGIC);
        Vsb {
            raw,
        }
    }

    /// Push a buffer into the `Vsb`
    pub fn cat<T: AsRef<[u8]>>(&mut self, src: &T) -> Result<(), ()> {
        let buf = src.as_ref().as_ptr() as *const std::ffi::c_void;
        let l = src.as_ref().len();

        match unsafe {varnish_sys::VSB_bcat(self.raw, buf, l as i64) } {
            0 => Ok(()),
            _ => Err(()),
        }
    }
}