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use super::{AlgorithmName, XofReaderCore};
use crate::XofReader;
use block_buffer::EagerBuffer;
use core::fmt;
use crypto_common::typenum::{IsLess, Le, NonZero, U256};
/// Wrapper around [`XofReaderCore`] implementations.
///
/// It handles data buffering and implements the mid-level traits.
#[derive(Clone, Default)]
pub struct XofReaderCoreWrapper<T>
where
T: XofReaderCore,
T::BlockSize: IsLess<U256>,
Le<T::BlockSize, U256>: NonZero,
{
pub(super) core: T,
pub(super) buffer: EagerBuffer<T::BlockSize>,
}
impl<T> fmt::Debug for XofReaderCoreWrapper<T>
where
T: XofReaderCore + AlgorithmName,
T::BlockSize: IsLess<U256>,
Le<T::BlockSize, U256>: NonZero,
{
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
T::write_alg_name(f)?;
f.write_str(" { .. }")
}
}
impl<T> XofReader for XofReaderCoreWrapper<T>
where
T: XofReaderCore,
T::BlockSize: IsLess<U256>,
Le<T::BlockSize, U256>: NonZero,
{
#[inline]
fn read(&mut self, buffer: &mut [u8]) {
let Self { core, buffer: buf } = self;
buf.set_data(buffer, |blocks| {
for block in blocks {
*block = core.read_block();
}
});
}
}
#[cfg(feature = "std")]
#[cfg_attr(docsrs, doc(cfg(feature = "std")))]
impl<T> std::io::Read for XofReaderCoreWrapper<T>
where
T: XofReaderCore,
T::BlockSize: IsLess<U256>,
Le<T::BlockSize, U256>: NonZero,
{
#[inline]
fn read(&mut self, buf: &mut [u8]) -> std::io::Result<usize> {
XofReader::read(self, buf);
Ok(buf.len())
}
}