1use super::{AlgorithmName, XofReaderCore};
2use crate::XofReader;
3use block_buffer::EagerBuffer;
4use core::fmt;
5use crypto_common::typenum::{IsLess, Le, NonZero, U256};
6
7/// Wrapper around [`XofReaderCore`] implementations.
8///
9/// It handles data buffering and implements the mid-level traits.
10#[derive(Clone, Default)]
11pub struct XofReaderCoreWrapper<T>
12where
13 T: XofReaderCore,
14 T::BlockSize: IsLess<U256>,
15 Le<T::BlockSize, U256>: NonZero,
16{
17 pub(super) core: T,
18 pub(super) buffer: EagerBuffer<T::BlockSize>,
19}
20
21impl<T> fmt::Debug for XofReaderCoreWrapper<T>
22where
23 T: XofReaderCore + AlgorithmName,
24 T::BlockSize: IsLess<U256>,
25 Le<T::BlockSize, U256>: NonZero,
26{
27 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
28 T::write_alg_name(f)?;
29 f.write_str(data:" { .. }")
30 }
31}
32
33impl<T> XofReader for XofReaderCoreWrapper<T>
34where
35 T: XofReaderCore,
36 T::BlockSize: IsLess<U256>,
37 Le<T::BlockSize, U256>: NonZero,
38{
39 #[inline]
40 fn read(&mut self, buffer: &mut [u8]) {
41 let Self { core: &mut T, buffer: buf: &mut BlockBuffer> + NonZero, …> } = self;
42 buf.set_data(data:buffer, |blocks: &mut [GenericArray + NonZero>]| {
43 for block: &mut GenericArray + NonZero> in blocks {
44 *block = core.read_block();
45 }
46 });
47 }
48}
49
50#[cfg(feature = "std")]
51#[cfg_attr(docsrs, doc(cfg(feature = "std")))]
52impl<T> std::io::Read for XofReaderCoreWrapper<T>
53where
54 T: XofReaderCore,
55 T::BlockSize: IsLess<U256>,
56 Le<T::BlockSize, U256>: NonZero,
57{
58 #[inline]
59 fn read(&mut self, buf: &mut [u8]) -> std::io::Result<usize> {
60 XofReader::read(self, buffer:buf);
61 Ok(buf.len())
62 }
63}
64